Add LZRW headers
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899
LZRW3-A.C
Executable file
899
LZRW3-A.C
Executable file
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//#pragma cplusplus off
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/******************************************************************************/
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/* */
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/* LZRW3-A.C */
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/* */
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/******************************************************************************/
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/* */
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/* Author : Ross Williams. */
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/* Date : 15-Jul-1991. */
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/* Release : 1. */
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/* */
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/******************************************************************************/
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/* */
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/* This file contains an implementation of the LZRW3-A data compression */
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/* algorithm in the C programming language. */
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/* */
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/* The LZRW3-A algorithm has the following features: */
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/* */
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/* 1 Requires only 16K of memory (for both compression and decompression). */
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/* 2 The compressor runs about two times faster than Unix compress's. */
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/* 3 The decompressor runs about three times faster than Unix compress's. */
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/* 4 Yields a few percent better compression than Unix compress for */
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/* most files. */
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/* 5 Allows you to dial up extra compression at a speed cost in the */
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/* compressor. The speed of the decompressor is not affected. */
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/* 6 Algorithm is deterministic. */
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/* 7 Algorithm is free of patent problems. The algorithm has not been */
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/* patented (nor will it be) and is of the LZ77 class which is fairly */
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/* clear of patents. */
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/* 8 This implementation in C is in the public domain. */
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/* */
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/* (Timing tests for the speed comparison were performed on a Pyramid 9820.) */
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/* */
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/* LZRW3-A is LZRW3 with a deepened hash table. This simple change yields */
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/* about a 6% (absolute) improvement in compression. */
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/* */
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/* Here are the results of applying this code, compiled under THINK C 4.0 */
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/* and running on a Mac-SE (8MHz 68000), to the standard calgary corpus. */
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/* */
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/* +----------------------------------------------------------------+ */
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/* | DATA COMPRESSION TEST | */
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/* | ===================== | */
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/* | Time of run : Mon 15-Jul-1991 05:29PM | */
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/* | Timing accuracy : One part in 100 | */
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/* | Context length : 262144 bytes (= 256.0000K) | */
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/* | Test suite : Calgary Corpus Suite | */
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/* | Files in suite : 14 | */
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/* | Algorithm : LZRW3-A | */
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/* | Note: All averages are calculated from the un-rounded values. | */
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/* +----------------------------------------------------------------+ */
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/* | File Name Length CxB ComLen %Remn Bits Com K/s Dec K/s | */
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/* | ---------- ------ --- ------ ----- ---- ------- ------- | */
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/* | rpus:Bib.D 111261 1 49044 44.1 3.53 8.47 31.19 | */
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/* | us:Book1.D 768771 3 420464 54.7 4.38 7.27 30.07 | */
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/* | us:Book2.D 610856 3 277955 45.5 3.64 8.51 33.40 | */
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/* | rpus:Geo.D 102400 1 84218 82.2 6.58 4.23 15.04 | */
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/* | pus:News.D 377109 2 192880 51.1 4.09 7.08 25.89 | */
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/* | pus:Obj1.D 21504 1 12651 58.8 4.71 5.23 17.44 | */
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/* | pus:Obj2.D 246814 1 108044 43.8 3.50 8.01 28.11 | */
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/* | s:Paper1.D 53161 1 24526 46.1 3.69 8.11 30.24 | */
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/* | s:Paper2.D 82199 1 39483 48.0 3.84 8.11 32.04 | */
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/* | rpus:Pic.D 513216 2 111622 21.7 1.74 10.64 49.31 | */
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/* | us:Progc.D 39611 1 17923 45.2 3.62 8.06 29.01 | */
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/* | us:Progl.D 71646 1 24362 34.0 2.72 10.74 39.51 | */
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/* | us:Progp.D 49379 1 16805 34.0 2.72 10.64 37.58 | */
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/* | us:Trans.D 93695 1 30296 32.3 2.59 11.02 38.06 | */
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/* +----------------------------------------------------------------+ */
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/* | Average 224401 1 100733 45.8 3.67 8.29 31.21 | */
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/* +----------------------------------------------------------------+ */
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/* */
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/******************************************************************************/
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/* INCLUDE FILES */
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/* ============= */
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#include "port.h" /* Defines symbols for the non portable stuff. */
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#include "compress.h" /* Defines single exported function "compress". */
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//#include "fast_copy.h" /* Fast memory copy routine. */
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/******************************************************************************/
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/* The following structure is returned by the "compress" function below when */
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/* the user asks the function to return identifying information. */
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/* The most important field in the record is the working memory field which */
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/* tells the calling program how much working memory should be passed to */
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/* "compress" when it is called to perform a compression or decompression. */
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/* LZRW3-A uses the same amount of memory during compression and */
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/* decompression. For more information on this structure see "compress.h". */
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/* The alignment fudge below really only needs to be 4 (but I play it safe!). */
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/* The id looks non-random, but it really was generated by coin tossing! */
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#define U(X) ((ULONG) X)
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#define SIZE_P_BYTE (U(sizeof(UBYTE *)))
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#define ALIGNMENT_FUDGE (U(16))
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#define MEM_REQ ( U(4096)*(SIZE_P_BYTE) + ALIGNMENT_FUDGE )
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static compress_identity identity =
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{
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U(0x01B90B91), /* Algorithm identification number. */
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MEM_REQ, /* Working memory (bytes) required. */
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"LZRW3-A", /* Name of algorithm. */
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"1.0 (safe)", /* Version number of algorithm. */
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"15-Jul-1990", /* Date of algorithm. */
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"Public Domain", /* Copyright notice. */
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"Ross N. Williams", /* Author of algorithm. */
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"Renaissance Software", /* Affiliation of author. */
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"Public Domain" /* Vendor of algorithm. */
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};
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int compress_compress (UBYTE *,UBYTE *,ULONG,ULONG,UBYTE *,ULONG *);
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int compress_decompress(UBYTE *,UBYTE *,ULONG,ULONG,UBYTE *,ULONG *);
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/******************************************************************************/
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/* This function is the only function exported by this module. */
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/* Depending on its first parameter, the function can be requested to */
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/* compress a block of memory, decompress a block of memory, or to identify */
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/* itself. For more information, see the specification file "compress.h". */
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EXPORT int xcompress(
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UWORD action, /* Action to be performed. */
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UBYTE *wrk_mem, /* Address of working memory we can use. */
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UBYTE *src_adr, /* Address of input data. */
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ULONG src_len, /* Length of input data. */
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ULONG dst_max, /* Maximum length of output buffer. */
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UBYTE *dst_adr, /* Address to put output data. */
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ULONG *p_dst_len) /* Address of longword for length of output data. */
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{
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switch (action)
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{
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case COMPRESS_ACTION_IDENTITY:
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if (dst_max && (dst_max < sizeof(ULONG)))
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return -1; /* Overflow */
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*p_dst_len=(ULONG) &identity;
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return 0;
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break;
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case COMPRESS_ACTION_COMPRESS:
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return compress_compress
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(wrk_mem,src_adr,src_len,dst_max,dst_adr,p_dst_len);
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break;
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case COMPRESS_ACTION_DECOMPRESS:
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return compress_decompress
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(wrk_mem,src_adr,src_len,dst_max,dst_adr,p_dst_len);
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break;
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}
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return -1; /* Invalid selector */
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}
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/******************************************************************************/
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/* */
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/* BRIEF DESCRIPTION OF THE LZRW3-A ALGORITHM */
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/* ========================================== */
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/* Note: Before attempting to understand this algorithm, you should first */
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/* understand the LZRW3 algorithm from which this algorithm is derived. */
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/* */
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/* The LZRW3-A algorithm is identical to the LZRW3 algorithm except that the */
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/* hash table has been "deepened". The LZRW3 algorithm has a hash table of */
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/* 4096 pointers which point to strings in the buffer. LZRW3-A generalizes */
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/* this to 4096/(2^n) partitions each of which contains (2^n) pointers. */
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/* In LZRW3-A, the hash function hashes to a partition number. */
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/* */
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/* During the processing of each phrase, LZRW3 overwrites the pointer in the */
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/* position selected by the hash function. LZRW3-A overwrites one of the */
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/* pointers in the partition that was selected by the hash function. */
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/* */
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/* When searching for a match, LZRW3-A matches against all (2^n) strings */
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/* pointed to by the pointers in the target partition. */
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/* */
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/* Deep hash tables were used in early versions of LZRW1 in late 1989, but */
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/* were discarded in an effort to increase speed (which was the primary */
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/* requirement for LZRW1). They were revived for use in LZRW3-A in order to */
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/* produce an algorithm with compression performance competitive with Unix */
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/* compress. */
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/* */
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/* Until 14-Jul-1991, deep hash tables used in prototype LZRW* algorithms */
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/* used a queue discipline within each partition. Upon the arrival of a new */
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/* pointer, the pointers in the partition would be block copied back one */
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/* position (with the oldest pointer being overwritten) and the new pointer */
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/* being inserted in the space at the front (the youngest position). */
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/* This meant that pointers to the (2^n) most recent phrases corresponding to */
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/* each hash was kept. The only flaw in this system was the time-consuming */
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/* block copy operation which was cheap for shallow tables but expensive for */
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/* deep tables. */
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/* */
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/* The traditional solution to ring buffer block copy problems is to maintain */
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/* a cyclic counter which points to the "head" of the queue. However, this */
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/* would have required one counter to be stored for each partition and would */
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/* have been slightly messy. After some thought (on 14-Jul-1991) a better */
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/* solution was found. Instead of maintaining a counter for each partition, */
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/* LZRW3-A maintains a single counter for all partitions! This counter is */
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/* maintained in both the compressor and decompressor and means that the */
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/* algorithm (effectively) overwrites a RANDOM element of the partition to be */
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/* updated. The result was to increase the speed of the compressor and */
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/* decompressor, to make the decompressor's speed independent from whatever */
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/* depth was selected, and to impair compression by less than 1% absolute. */
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/* */
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/* Setting the depth is a speed/compression tradeoff. The table below gives */
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/* the tradeoff observed for a typical 50K text file on a Mac-SE. */
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/* Note: %Rem=Percentage Remaining (after compression). */
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/* */
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/* Depth %Rem CmpK/s DecK/s */
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/* 1 45.2 14.77 32.24 */
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/* 2 42.6 12.12 31.26 */
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/* 4 40.9 10.28 31.91 */
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/* 8 40.0 7.81 32.36 */
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/* 16 39.5 5.30 32.47 */
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/* 32 39.0 3.23 32.59 */
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/* */
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/* I have chosen a depth of 8 as the "default" depth for LZRW3-A. If you use */
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/* a depth different to this (e.g. 4), you should use the name LZRW3-A(4) to */
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/* indicate that a different depth is being used. LZRW3-A(8) is an acceptable */
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/* longhand for LZRW3-A. */
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/* */
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/* To change the depth, search for "HERE IT IS" in the rest of this file. */
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/* */
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/* +---+ */
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/* |___|4095 */
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/* |===| */
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/* +---------------------*_|<---+ /----+---\ */
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/* | |___| +---|Hash | */
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/* | 512 partitions |___| |Function| */
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/* | of 8 pointers |===| \--------/ */
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/* | each (or any |___|0 ^ */
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/* | a*b=4096) +---+ | */
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/* | Hash +-----+ */
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/* | Table | */
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/* | --- */
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/* v ^^^ */
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/* +-------------------------------------|----------------+ */
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/* |||||||||||||||||||||||||||||||||||||||||||||||||||||||| */
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/* +-------------------------------------|----------------+ */
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/* | |1......18| | */
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/* |<------- Lempel=History ------------>|<--Ziv-->| | */
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/* | (=bytes already processed) |<-Still to go-->| */
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/* |<-------------------- INPUT BLOCK ------------------->| */
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/* */
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/* */
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/******************************************************************************/
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/* */
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/* DEFINITION OF COMPRESSED FILE FORMAT */
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/* ==================================== */
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/* * A compressed file consists of a COPY FLAG followed by a REMAINDER. */
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/* * The copy flag CF uses up four bytes with the first byte being the */
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/* least significant. */
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/* * If CF=1, then the compressed file represents the remainder of the file */
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/* exactly. Otherwise CF=0 and the remainder of the file consists of zero */
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/* or more GROUPS, each of which represents one or more bytes. */
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/* * Each group consists of two bytes of CONTROL information followed by */
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/* sixteen ITEMs except for the last group which can contain from one */
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/* to sixteen items. */
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/* * An item can be either a LITERAL item or a COPY item. */
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/* * Each item corresponds to a bit in the control bytes. */
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/* * The first control byte corresponds to the first 8 items in the group */
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/* with bit 0 corresponding to the first item in the group and bit 7 to */
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/* the eighth item in the group. */
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/* * The second control byte corresponds to the second 8 items in the group */
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/* with bit 0 corresponding to the ninth item in the group and bit 7 to */
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/* the sixteenth item in the group. */
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/* * A zero bit in a control word means that the corresponding item is a */
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/* literal item. A one bit corresponds to a copy item. */
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/* * A literal item consists of a single byte which represents itself. */
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/* * A copy item consists of two bytes that represent from 3 to 18 bytes. */
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/* * The first byte in a copy item will be denoted C1. */
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/* * The second byte in a copy item will be denoted C2. */
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/* * Bits will be selected using square brackets. */
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/* For example: C1[0..3] is the low nibble of the first control byte. */
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/* of copy item C1. */
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/* * The LENGTH of a copy item is defined to be C1[0..3]+3 which is a number */
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/* in the range [3,18]. */
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/* * The INDEX of a copy item is defined to be C1[4..7]*256+C2[0..8] which */
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/* is a number in the range [0,4095]. */
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/* * A copy item represents the sequence of bytes */
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/* text[POS-OFFSET..POS-OFFSET+LENGTH-1] where */
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/* text is the entire text of the uncompressed string. */
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/* POS is the index in the text of the character following the */
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/* string represented by all the items preceeding the item */
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/* being defined. */
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/* OFFSET is obtained from INDEX by looking up the hash table. */
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/* */
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/******************************************************************************/
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/* When I first started to get concerned about the portability of my C code, */
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/* I switched over to using only macro defined types UBYTE, UWORD, ULONG and */
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/* one or two others. While, these are useful for most purposes, they impair */
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/* efficiency as, if I have a variable whose range will be [0,1000], I will */
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/* declare it as a UWORD. This will translate into (say) "short int" and */
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/* hence may be less efficient than just an "int" which represents the */
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/* natural size of the machine. Before releasing LZRW3-A, I realized this */
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/* mistake. Unfortunately, I can't access the ftp archive with my portability */
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/* header in it in time for this algorithm's release and so I am including an */
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/* extra definition. The definition UCARD stands for an unsigned (cardinal) */
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/* type that can hold values in the range [0,32767]. This is within the ANSI */
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/* range of a standard int or unsigned. No assumption about overflow of this */
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/* type is made in the code (i.e. all usages are within range and I do not */
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/* use the value -1 to detect the end of loops.). */
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/* You can use either "unsigned" or just "int" here depending on which is */
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/* more efficient in your environment (both the same probably). */
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#define UCARD unsigned
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/* The following #define defines the length of the copy flag that appears at */
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/* the start of the compressed file. The value of four bytes was chosen */
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/* because the fast_copy routine on my Macintosh runs faster if the source */
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/* and destination blocks are relatively longword aligned. */
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/* The actual flag data appears in the first byte. The rest are zeroed so as */
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/* to normalize the compressed representation (i.e. not non-deterministic). */
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#define FLAG_BYTES 4
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/* The following #defines define the meaning of the values of the copy */
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/* flag at the start of the compressed file. */
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#define FLAG_COMPRESS 0 /* Signals that output was result of compression. */
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#define FLAG_COPY 1 /* Signals that output was simply copied over. */
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/* The 68000 microprocessor (on which this algorithm was originally developed */
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/* is fussy about non-aligned arrays of words. To avoid these problems the */
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/* following macro can be used to "waste" from 0 to 3 bytes so as to align */
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/* the argument pointer. */
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||||||
|
#define ULONG_ALIGN_UP(X) ((((ULONG)X)+3)&~3)
|
||||||
|
|
||||||
|
/* The following constant defines the maximum length of an uncompressed item. */
|
||||||
|
/* This definition must not be changed; its value is hardwired into the code. */
|
||||||
|
/* The longest number of bytes that can be spanned by a single item is 18 */
|
||||||
|
/* for the longest copy item. */
|
||||||
|
#define MAX_RAW_ITEM (18)
|
||||||
|
|
||||||
|
/* The following constant defines the maximum length of an uncompressed group.*/
|
||||||
|
/* This definition must not be changed; its value is hardwired into the code. */
|
||||||
|
/* A group contains at most 16 items which explains this definition. */
|
||||||
|
#define MAX_RAW_GROUP (16*MAX_RAW_ITEM)
|
||||||
|
|
||||||
|
/* The following constant defines the maximum length of a compressed group. */
|
||||||
|
/* This definition must not be changed; its value is hardwired into the code. */
|
||||||
|
/* A compressed group consists of two control bytes followed by up to 16 */
|
||||||
|
/* compressed items each of which can have a maximum length of two bytes. */
|
||||||
|
#define MAX_CMP_GROUP (2+16*2)
|
||||||
|
|
||||||
|
/* This constant defines the number of pointers in the hash table. The number */
|
||||||
|
/* of partitions multiplied by the number of pointers in each partition must */
|
||||||
|
/* multiply out to this value of 4096. In LZRW1, LZRW1-A, and LZRW2, this */
|
||||||
|
/* table length value can be changed. However, in LZRW3-A (and LZRW3), the */
|
||||||
|
/* table length cannot be changed because it is connected directly to the */
|
||||||
|
/* coding scheme which is hardwired (the table index of a single pointer is */
|
||||||
|
/* transmitted in the 12-bit index field). So don't change this constant! */
|
||||||
|
#define HASH_TABLE_LENGTH (4096)
|
||||||
|
|
||||||
|
/* HERE IT IS: THE PLACE TO CHANGE THE HASH TABLE DEPTH! */
|
||||||
|
/* The following definition is the log_2 of the depth of the hash table. This */
|
||||||
|
/* constant can be in the range [0,1,2,3,...,12]. Increasing the depth */
|
||||||
|
/* increases compression at the expense of speed. However, you are not likely */
|
||||||
|
/* to see much of a compression improvement (e.g. not more than 0.5%) above a */
|
||||||
|
/* value of 6 and the algorithm will start to get very slow. See the table in */
|
||||||
|
/* the earlier comments block for an idea of the trade-off involved. */
|
||||||
|
/* Note: The parentheses are to avoid macro substitution funnies. */
|
||||||
|
/* Note: The LZRW3-A default is a value of (3). */
|
||||||
|
/* Note: If you end up choosing a value of 0, you should use LZRW3 instead. */
|
||||||
|
/* Note: Changing the value of HASH_TABLE_DEPTH_BITS is the ONLY thing you */
|
||||||
|
/* have to do to change the depth, so go ahead and recompile now! */
|
||||||
|
/* Note: I have tested LZRW3-A for DEPTH_BITS=0,1,2,3,4 and a few other */
|
||||||
|
/* values. However, I have not tested it for 12 as I can't wait that long! */
|
||||||
|
#define HASH_TABLE_DEPTH_BITS (3) /* Must be in range [0,12]. */
|
||||||
|
|
||||||
|
/* The following definitions are all self-explanatory and follow from the */
|
||||||
|
/* definition of HASH_TABLE_DEPTH_BITS and the hardwired requirement that the */
|
||||||
|
/* hash table contain exactly 4096 pointers. */
|
||||||
|
#define PARTITION_LENGTH_BITS (12-HASH_TABLE_DEPTH_BITS)
|
||||||
|
#define PARTITION_LENGTH (1<<PARTITION_LENGTH_BITS)
|
||||||
|
#define HASH_TABLE_DEPTH (1<<HASH_TABLE_DEPTH_BITS )
|
||||||
|
#define HASH_MASK (PARTITION_LENGTH-1)
|
||||||
|
#define DEPTH_MASK (HASH_TABLE_DEPTH-1)
|
||||||
|
|
||||||
|
/* LZRW3-A, unlike LZRW1(-A), must initialize its hash table so as to enable */
|
||||||
|
/* the compressor and decompressor to stay in step maintaining identical hash */
|
||||||
|
/* tables. In an early version of LZRW3, the tables were simply */
|
||||||
|
/* initialized to zero and a check for zero was included just before the */
|
||||||
|
/* matching code. However, this test costs time. A better solution is to */
|
||||||
|
/* initialize all the entries in the hash table to point to a constant */
|
||||||
|
/* string. The decompressor does the same. This solution requires no extra */
|
||||||
|
/* test. The contents of the string do not matter so long as the string is */
|
||||||
|
/* the same for the compressor and decompressor and contains at least */
|
||||||
|
/* MAX_RAW_ITEM bytes. I chose consecutive decimal digits because they do not */
|
||||||
|
/* have white space problems (e.g. there is no chance that the compiler will */
|
||||||
|
/* replace more than one space by a TAB) and because they make the length of */
|
||||||
|
/* the string obvious by inspection. */
|
||||||
|
#define START_STRING_18 ((UBYTE *) "123456789012345678")
|
||||||
|
|
||||||
|
/* The following macro accepts a pointer PTR to three consecutive bytes in */
|
||||||
|
/* memory and hashes them into an integer that is a hash table index that */
|
||||||
|
/* points to the zeroth (first) element of a partition. Thus, the hash */
|
||||||
|
/* function really hashes to a partition number but, for convenience, */
|
||||||
|
/* multiplies it up to yield a hash table index. From all this, we see that */
|
||||||
|
/* the resultant number is in the range [0,HASH_TABLE_LENGTH-1] and is a */
|
||||||
|
/* multiple of HASH_TABLE_DEPTH. */
|
||||||
|
/* A macro is used, because in LZRW3-A we have to hash more than once. */
|
||||||
|
#define HASH(PTR) \
|
||||||
|
( \
|
||||||
|
(((40543*(((*(PTR))<<8)^((*((PTR)+1))<<4)^(*((PTR)+2))))>>4) & HASH_MASK) \
|
||||||
|
<< HASH_TABLE_DEPTH_BITS \
|
||||||
|
)
|
||||||
|
|
||||||
|
/* Another operation that is performed more than once is the updating of the */
|
||||||
|
/* hash table. Here two macros are defined to simplify update operations. */
|
||||||
|
/* Updating consists of identifying and overwriting a pointer in a partition */
|
||||||
|
/* with a newer pointer and then updating the global cycle value. */
|
||||||
|
/* These macros accept the new pointer (NEWPTR) and either a pointer to */
|
||||||
|
/* (P_BASE) or the index of (I_BASE) the zeroth (first, or base) pointer in */
|
||||||
|
/* the partition that is to be updated. The macros use the 'cycle' variable */
|
||||||
|
/* to locate and overwrite a pointer and then update the cycle value. */
|
||||||
|
/* Note: Hardcoding 'cycle' in this macro is naughty (it should really be a */
|
||||||
|
/* macro parameter), but I have done so because it neatens up the code. */
|
||||||
|
#define UPDATE_P(P_BASE,NEWPTR) \
|
||||||
|
{(P_BASE)[cycle++]=(NEWPTR); cycle&=DEPTH_MASK;}
|
||||||
|
|
||||||
|
#define UPDATE_I(I_BASE,NEWPTR) \
|
||||||
|
{hash[(I_BASE)+cycle++]=(NEWPTR); cycle&=DEPTH_MASK;}
|
||||||
|
|
||||||
|
/* This constant supplies a legal (in-range) hash table index for use when */
|
||||||
|
/* a legal-but-don't-care index is required. */
|
||||||
|
#define ANY_HASH_INDEX (0)
|
||||||
|
|
||||||
|
/******************************************************************************/
|
||||||
|
|
||||||
|
int compress_compress
|
||||||
|
(
|
||||||
|
/* Input : Hand over the required amount of working memory in p_wrk_mem. */
|
||||||
|
/* Input : Specify input block using p_src_first and src_len. */
|
||||||
|
/* Input : Point p_dst_first to the start of the output zone (OZ). */
|
||||||
|
/* Input : Point p_dst_len to a ULONG to receive the output length. */
|
||||||
|
/* Input : Input block and output zone must not overlap. */
|
||||||
|
/* Input : Maximum length of output buffer. */
|
||||||
|
/* Output : Length of output block written to *p_dst_len. */
|
||||||
|
/* Output : Output block in Mem[p_dst_first..p_dst_first+*p_dst_len-1]. May */
|
||||||
|
/* Output : write in OZ=Mem[p_dst_first..p_dst_first+src_len+MAX_CMP_GROUP-1].*/
|
||||||
|
/* Output : Upon completion guaranteed *p_dst_len<=src_len+FLAG_BYTES. */
|
||||||
|
UBYTE *p_wrk_mem,
|
||||||
|
UBYTE *p_src_first,
|
||||||
|
ULONG src_len,
|
||||||
|
ULONG dst_max,
|
||||||
|
UBYTE *p_dst_first,
|
||||||
|
ULONG *p_dst_len)
|
||||||
|
{
|
||||||
|
/* p_src and p_dst step through the source and destination blocks. */
|
||||||
|
UBYTE *p_src = p_src_first;
|
||||||
|
UBYTE *p_dst = p_dst_first;
|
||||||
|
|
||||||
|
/* The following variables are never modified and are used in the */
|
||||||
|
/* calculations that determine when the main loop terminates. */
|
||||||
|
UBYTE *p_src_post = p_src_first+src_len;
|
||||||
|
UBYTE *p_dst_post = p_dst_first+src_len;
|
||||||
|
UBYTE *p_src_max1 = p_src_first+src_len-MAX_RAW_ITEM;
|
||||||
|
UBYTE *p_src_max16 = p_src_first+src_len-MAX_RAW_ITEM*16;
|
||||||
|
|
||||||
|
/* The variables 'p_control' and 'control' are used to buffer control bits. */
|
||||||
|
/* Before each group is processed, the next two bytes of the output block */
|
||||||
|
/* are set aside for the control word for the group about to be processed. */
|
||||||
|
/* 'p_control' is set to point to the first byte of that word. Meanwhile, */
|
||||||
|
/* 'control' buffers the control bits being generated during the processing */
|
||||||
|
/* of the group. Instead of having a counter to keep track of how many items */
|
||||||
|
/* have been processed (=the number of bits in the control word), at the */
|
||||||
|
/* start of each group, the top word of 'control' is filled with 1 bits. */
|
||||||
|
/* As 'control' is shifted for each item, the 1 bits in the top word are */
|
||||||
|
/* absorbed or destroyed. When they all run out (i.e. when the top word is */
|
||||||
|
/* all zero bits, we know that we are at the end of a group. */
|
||||||
|
#define TOPWORD 0xFFFF0000
|
||||||
|
UBYTE *p_control;
|
||||||
|
ULONG control=TOPWORD;
|
||||||
|
|
||||||
|
/* The variable 'hash' always points to the first element of the hash table. */
|
||||||
|
UBYTE **hash= (UBYTE **) ULONG_ALIGN_UP(p_wrk_mem);
|
||||||
|
|
||||||
|
/* The following two variables represent the literal buffer. p_h1 points to */
|
||||||
|
/* the partition (i.e. the zero'th (first) element of the partition) */
|
||||||
|
/* corresponding to the youngest literal. p_h2 points to the partition */
|
||||||
|
/* corresponding to the second youngest literal. */
|
||||||
|
/* The value zero denotes an "empty" buffer value with p_h1=0 => p_h2=0. */
|
||||||
|
UBYTE **p_h1=0;
|
||||||
|
UBYTE **p_h2=0;
|
||||||
|
|
||||||
|
/* The following variable holds the current 'cycle' value. This value cycles */
|
||||||
|
/* through the range [0,HASH_TABLE_DEPTH-1], being incremented every time */
|
||||||
|
/* the hash table is updated. The value gives the within-partition number of */
|
||||||
|
/* the next pointer to be overwritten. The decompressor maintains a cycle */
|
||||||
|
/* value in synchrony. */
|
||||||
|
UCARD cycle=0;
|
||||||
|
|
||||||
|
/* Validate the output buffer size before starting any compression. */
|
||||||
|
if (dst_max && (dst_max < src_len+FLAG_BYTES))
|
||||||
|
goto dst_overrun;
|
||||||
|
|
||||||
|
/* To start, we write the flag bytes. Being optimistic, we set the flag to */
|
||||||
|
/* FLAG_COMPRESS. The remaining flag bytes are zeroed so as to keep the */
|
||||||
|
/* algorithm deterministic. */
|
||||||
|
*p_dst++=FLAG_COMPRESS;
|
||||||
|
{UCARD i; for (i=2;i<=FLAG_BYTES;i++) *p_dst++=0;}
|
||||||
|
|
||||||
|
/* Reserve the first word of output as the control word for the first group. */
|
||||||
|
/* Note: This is undone at the end if the input block is empty. */
|
||||||
|
p_control=p_dst; p_dst+=2;
|
||||||
|
|
||||||
|
/* Initialize all elements of the hash table to point to a constant string. */
|
||||||
|
/* Use of an unrolled loop speeds this up considerably. */
|
||||||
|
/* These variables should really be declared "register", but I am worried */
|
||||||
|
/* about the possibility that extra register declarations will tempt stupid */
|
||||||
|
/* compilers to allocate all registers before they get to the innermostloop. */
|
||||||
|
{UCARD i; UBYTE **p_h=hash;
|
||||||
|
#define ZH *p_h++=START_STRING_18
|
||||||
|
for (i=0;i<256;i++) /* 256=HASH_TABLE_LENGTH/16. */
|
||||||
|
{ZH;ZH;ZH;ZH;
|
||||||
|
ZH;ZH;ZH;ZH;
|
||||||
|
ZH;ZH;ZH;ZH;
|
||||||
|
ZH;ZH;ZH;ZH;}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* The main loop processes either 1 or 16 items per iteration. As its */
|
||||||
|
/* termination logic is complicated, I have opted for an infinite loop */
|
||||||
|
/* structure containing 'break' and 'goto' statements. */
|
||||||
|
while (TRUE)
|
||||||
|
{/* Begin main processing loop. */
|
||||||
|
|
||||||
|
/* Note: All the variables here except unroll should be defined within */
|
||||||
|
/* the inner loop. Unfortunately the loop hasn't got a block. */
|
||||||
|
UBYTE *p_ziv; /* Points to first byte of current Ziv. */
|
||||||
|
UCARD unroll; /* Loop counter for unrolled inner loop. */
|
||||||
|
UCARD index; /* Index of current partition. */
|
||||||
|
UBYTE **p_h0; /* Pointer to current partition. */
|
||||||
|
register UCARD d; /* Depth looping variable. */
|
||||||
|
register UCARD bestlen; /* Holds the best length seen so far. */
|
||||||
|
register UCARD bestpos; /* Holds number of best pointer seen so far. */
|
||||||
|
|
||||||
|
/* Test for overrun and jump to overrun code if necessary. */
|
||||||
|
if (p_dst>p_dst_post)
|
||||||
|
goto overrun;
|
||||||
|
|
||||||
|
/* The following cascade of if statements efficiently catches and deals */
|
||||||
|
/* with varying degrees of closeness to the end of the input block. */
|
||||||
|
/* When we get very close to the end, we stop updating the table and */
|
||||||
|
/* code the remaining bytes as literals. This makes the code simpler. */
|
||||||
|
unroll=16;
|
||||||
|
if (p_src>p_src_max16)
|
||||||
|
{
|
||||||
|
unroll=1;
|
||||||
|
if (p_src>p_src_max1)
|
||||||
|
{
|
||||||
|
if (p_src==p_src_post)
|
||||||
|
break;
|
||||||
|
else
|
||||||
|
{p_h0=&hash[ANY_HASH_INDEX]; /* Avoid undefined pointer. */
|
||||||
|
goto literal;}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* This inner unrolled loop processes 'unroll' (whose value is either 1 */
|
||||||
|
/* or 16) items. I have chosen to implement this loop with labels and */
|
||||||
|
/* gotos to heighten the ease with which the loop may be implemented with */
|
||||||
|
/* a single decrement and branch instruction in assembly language and */
|
||||||
|
/* also because the labels act as highly readable place markers. */
|
||||||
|
/* (Also because we jump into the loop for endgame literals (see above)). */
|
||||||
|
|
||||||
|
begin_unrolled_loop:
|
||||||
|
|
||||||
|
p_ziv=p_src;
|
||||||
|
|
||||||
|
/* To process the next phrase, we hash the next three bytes to obtain */
|
||||||
|
/* an index to the zeroth (first) pointer in a target partition. We */
|
||||||
|
/* get the pointer. */
|
||||||
|
index=HASH(p_src);
|
||||||
|
p_h0=&hash[index];
|
||||||
|
|
||||||
|
/* This next part runs through the pointers in the partition matching */
|
||||||
|
/* the bytes they point to in the Lempel with the bytes in the Ziv. */
|
||||||
|
/* The length (bestlen) and within-partition pointer number (bestpos) */
|
||||||
|
/* of the longest match so far is maintained and is the output of this */
|
||||||
|
/* segment of code. The s[bestlen]==... is an optimization only. */
|
||||||
|
bestlen=0;
|
||||||
|
bestpos=0;
|
||||||
|
for (d=0;d<HASH_TABLE_DEPTH;d++)
|
||||||
|
{
|
||||||
|
register UBYTE *s=p_src;
|
||||||
|
register UBYTE *p=p_h0[d];
|
||||||
|
register UCARD len;
|
||||||
|
if (s[bestlen] == p[bestlen])
|
||||||
|
{
|
||||||
|
#define PS *p++!=*s++
|
||||||
|
PS || PS || PS || PS || PS || PS || PS || PS || PS ||
|
||||||
|
PS || PS || PS || PS || PS || PS || PS || PS || PS || s++;
|
||||||
|
len=s-p_src-1;
|
||||||
|
if (len>bestlen)
|
||||||
|
{
|
||||||
|
bestpos=d;
|
||||||
|
bestlen=len;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* The length of the longest match determines whether we code a */
|
||||||
|
/* literal item or a copy item. */
|
||||||
|
|
||||||
|
if (bestlen<3)
|
||||||
|
{
|
||||||
|
/* Literal. */
|
||||||
|
|
||||||
|
/* Code the literal byte as itself and a zero control bit. */
|
||||||
|
literal: *p_dst++=*p_src++; control&=0xFFFEFFFF;
|
||||||
|
|
||||||
|
/* We have just coded a literal. If we had two pending ones, that */
|
||||||
|
/* makes three and we can update the hash table. */
|
||||||
|
if (p_h2!=0)
|
||||||
|
{UPDATE_P(p_h2,p_ziv-2);}
|
||||||
|
|
||||||
|
/* In any case, rotate the hash table pointers for next time. */
|
||||||
|
p_h2=p_h1; p_h1=p_h0;
|
||||||
|
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
/* Copy */
|
||||||
|
|
||||||
|
/* To code a copy item, we construct a hash table index of the */
|
||||||
|
/* winning pointer (index+=bestpos) and code it and the best length */
|
||||||
|
/* into a 2 byte code word. Bump up p_src. */
|
||||||
|
index+=bestpos;
|
||||||
|
*p_dst++=((index&0xF00)>>4)|(bestlen-3);
|
||||||
|
*p_dst++=index&0xFF;
|
||||||
|
p_src+=bestlen;
|
||||||
|
|
||||||
|
/* As we have just coded three bytes, we are now in a position to */
|
||||||
|
/* update the hash table with the literal bytes that were pending */
|
||||||
|
/* upon the arrival of extra context bytes. */
|
||||||
|
if (p_h1!=0)
|
||||||
|
{
|
||||||
|
if (p_h2!=0)
|
||||||
|
{UPDATE_P(p_h2,p_ziv-2); p_h2=0;}
|
||||||
|
UPDATE_P(p_h1,p_ziv-1); p_h1=0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* In any case, we can update the hash table based on the current */
|
||||||
|
/* position as we just coded at least three bytes in a copy items. */
|
||||||
|
UPDATE_P(p_h0,p_ziv);
|
||||||
|
}
|
||||||
|
control>>=1;
|
||||||
|
|
||||||
|
/* This loop is all set up for a decrement and jump instruction! */
|
||||||
|
end_unrolled_loop: if (--unroll) goto begin_unrolled_loop;
|
||||||
|
|
||||||
|
/* At this point it will nearly always be the end of a group in which */
|
||||||
|
/* case, we have to do some control-word processing. However, near the */
|
||||||
|
/* end of the input block, the inner unrolled loop is only executed once. */
|
||||||
|
/* This necessitates the 'if' test. */
|
||||||
|
if ((control&TOPWORD)==0)
|
||||||
|
{
|
||||||
|
/* Write the control word to the place we saved for it in the output. */
|
||||||
|
*p_control++= control &0xFF;
|
||||||
|
*p_control = (control>>8) &0xFF;
|
||||||
|
|
||||||
|
/* Reserve the next word in the output block for the control word */
|
||||||
|
/* for the group about to be processed. */
|
||||||
|
p_control=p_dst; p_dst+=2;
|
||||||
|
|
||||||
|
/* Reset the control bits buffer. */
|
||||||
|
control=TOPWORD;
|
||||||
|
}
|
||||||
|
|
||||||
|
} /* End main processing loop. */
|
||||||
|
|
||||||
|
/* After the main processing loop has executed, all the input bytes have */
|
||||||
|
/* been processed. However, the control word has still to be written to the */
|
||||||
|
/* word reserved for it in the output at the start of the most recent group. */
|
||||||
|
/* Before writing, the control word has to be shifted so that all the bits */
|
||||||
|
/* are in the right place. The "empty" bit positions are filled with 1s */
|
||||||
|
/* which partially fill the top word. */
|
||||||
|
while(control&TOPWORD) control>>=1;
|
||||||
|
*p_control++= control &0xFF;
|
||||||
|
*p_control++=(control>>8) &0xFF;
|
||||||
|
|
||||||
|
/* If the last group contained no items, delete the control word too. */
|
||||||
|
if (p_control==p_dst) p_dst-=2;
|
||||||
|
|
||||||
|
/* Write the length of the output block to the dst_len parameter and return. */
|
||||||
|
*p_dst_len=p_dst-p_dst_first;
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
/* Jump here as soon as an overrun is detected. An overrun is defined to */
|
||||||
|
/* have occurred if p_dst>p_dst_first+src_len. That is, the moment the */
|
||||||
|
/* length of the output written so far exceeds the length of the input block.*/
|
||||||
|
/* The algorithm checks for overruns at least at the end of each group */
|
||||||
|
/* which means that the maximum overrun is MAX_CMP_GROUP bytes. */
|
||||||
|
/* Once an overrun occurs, the only thing to do is to set the copy flag and */
|
||||||
|
/* copy the input over. */
|
||||||
|
overrun:
|
||||||
|
*p_dst_first=FLAG_COPY;
|
||||||
|
fast_copy(p_src_first,p_dst_first+FLAG_BYTES,src_len);
|
||||||
|
*p_dst_len=src_len+FLAG_BYTES;
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
/* Jump here if the destination buffer is insufficient to hold the output */
|
||||||
|
/* data. We return -1 to indicate an error and set the output length to 0. */
|
||||||
|
dst_overrun:
|
||||||
|
*p_dst_len = 0;
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/******************************************************************************/
|
||||||
|
|
||||||
|
int compress_decompress
|
||||||
|
(
|
||||||
|
/* Input : Hand over the required amount of working memory in p_wrk_mem. */
|
||||||
|
/* Input : Specify input block using p_src_first and src_len. */
|
||||||
|
/* Input : Point p_dst_first to the start of the output zone. */
|
||||||
|
/* Input : Point p_dst_len to a ULONG to receive the output length. */
|
||||||
|
/* Input : Maximum length of output buffer. */
|
||||||
|
/* Input : Input block and output zone must not overlap. User knows */
|
||||||
|
/* Input : upperbound on output block length from earlier compression. */
|
||||||
|
/* Input : In any case, maximum expansion possible is nine times. */
|
||||||
|
/* Output : Length of output block written to *p_dst_len. */
|
||||||
|
/* Output : Output block in Mem[p_dst_first..p_dst_first+*p_dst_len-1]. */
|
||||||
|
/* Output : Writes only in Mem[p_dst_first..p_dst_first+*p_dst_len-1]. */
|
||||||
|
UBYTE *p_wrk_mem,
|
||||||
|
UBYTE *p_src_first,
|
||||||
|
ULONG src_len,
|
||||||
|
ULONG dst_max,
|
||||||
|
UBYTE *p_dst_first,
|
||||||
|
ULONG *p_dst_len)
|
||||||
|
{
|
||||||
|
/* Byte pointers p_src and p_dst scan through the input and output blocks. */
|
||||||
|
register UBYTE *p_src = p_src_first+FLAG_BYTES;
|
||||||
|
register UBYTE *p_dst = p_dst_first;
|
||||||
|
|
||||||
|
/* The following two variables are never modified and are used to control */
|
||||||
|
/* the main loop. */
|
||||||
|
UBYTE *p_src_post = p_src_first+src_len;
|
||||||
|
UBYTE *p_src_max16 = p_src_first+src_len-(MAX_CMP_GROUP-2);
|
||||||
|
|
||||||
|
/* The hash table is the only resident of the working memory. The hash table */
|
||||||
|
/* contains HASH_TABLE_LENGTH=4096 pointers to positions in the history. To */
|
||||||
|
/* keep Macintoshes happy, it is longword aligned. */
|
||||||
|
UBYTE **hash = (UBYTE **) ULONG_ALIGN_UP(p_wrk_mem);
|
||||||
|
|
||||||
|
/* The variable 'control' is used to buffer the control bits which appear in */
|
||||||
|
/* groups of 16 bits (control words) at the start of each compressed group. */
|
||||||
|
/* When each group is read, bit 16 of the register is set to one. Whenever */
|
||||||
|
/* a new bit is needed, the register is shifted right. When the value of the */
|
||||||
|
/* register becomes 1, we know that we have reached the end of a group. */
|
||||||
|
/* Initializing the register to 1 thus instructs the code to follow that it */
|
||||||
|
/* should read a new control word immediately. */
|
||||||
|
register ULONG control=1;
|
||||||
|
|
||||||
|
/* The value of 'literals' is always in the range 0..3. It is the number of */
|
||||||
|
/* consecutive literal items just seen. We have to record this number so as */
|
||||||
|
/* to know when to update the hash table. When literals gets to 3, there */
|
||||||
|
/* have been three consecutive literals and we can update at the position of */
|
||||||
|
/* the oldest of the three. */
|
||||||
|
register UCARD literals=0;
|
||||||
|
|
||||||
|
/* The following variable holds the current 'cycle' value. This value cycles */
|
||||||
|
/* through the range [0,HASH_TABLE_DEPTH-1], being incremented every time */
|
||||||
|
/* the hash table is updated. The value give the within-partition number of */
|
||||||
|
/* the next pointer to be overwritten. The compressor maintains a cycle */
|
||||||
|
/* value in synchrony. */
|
||||||
|
UCARD cycle=0;
|
||||||
|
|
||||||
|
/* Check the leading copy flag to see if the compressor chose to use a copy */
|
||||||
|
/* operation instead of a compression operation. If a copy operation was */
|
||||||
|
/* used, then all we need to do is copy the data over, set the output length */
|
||||||
|
/* and return. */
|
||||||
|
if (*p_src_first==FLAG_COPY)
|
||||||
|
{
|
||||||
|
/* Check for destination buffer for overflow before writing data. */
|
||||||
|
if (dst_max && (dst_max < src_len-FLAG_BYTES))
|
||||||
|
goto dst_overrun;
|
||||||
|
|
||||||
|
fast_copy(p_src_first+FLAG_BYTES,p_dst_first,src_len-FLAG_BYTES);
|
||||||
|
*p_dst_len=src_len-FLAG_BYTES;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Initialize all elements of the hash table to point to a constant string. */
|
||||||
|
/* Use of an unrolled loop speeds this up considerably. */
|
||||||
|
/* The comment about register declarations above similar code in the */
|
||||||
|
/* compressor applies here too. */
|
||||||
|
{UCARD i; UBYTE **p_h=hash;
|
||||||
|
#define ZJ *p_h++=START_STRING_18
|
||||||
|
for (i=0;i<256;i++) /* 256=HASH_TABLE_LENGTH/16. */
|
||||||
|
{ZJ;ZJ;ZJ;ZJ;
|
||||||
|
ZJ;ZJ;ZJ;ZJ;
|
||||||
|
ZJ;ZJ;ZJ;ZJ;
|
||||||
|
ZJ;ZJ;ZJ;ZJ;}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* The outer loop processes either 1 or 16 items per iteration depending on */
|
||||||
|
/* how close p_src is to the end of the input block. */
|
||||||
|
while (p_src!=p_src_post)
|
||||||
|
{/* Start of outer loop */
|
||||||
|
|
||||||
|
register UCARD unroll; /* Counts unrolled loop executions. */
|
||||||
|
|
||||||
|
/* When 'control' has the value 1, it means that the 16 buffered control */
|
||||||
|
/* bits that were read in at the start of the current group have all been */
|
||||||
|
/* shifted out and that all that is left is the 1 bit that was injected */
|
||||||
|
/* into bit 16 at the start of the current group. When we reach the end */
|
||||||
|
/* of a group, we have to load a new control word and inject a new 1 bit. */
|
||||||
|
if (control==1)
|
||||||
|
{
|
||||||
|
control=0x10000|*p_src++;
|
||||||
|
control|=(*p_src++)<<8;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* If it is possible that we are within 16 groups from the end of the */
|
||||||
|
/* input, execute the unrolled loop only once, else process a whole group */
|
||||||
|
/* of 16 items by looping 16 times. */
|
||||||
|
unroll= p_src<=p_src_max16 ? 16 : 1;
|
||||||
|
|
||||||
|
/* This inner loop processes one phrase (item) per iteration. */
|
||||||
|
while (unroll--)
|
||||||
|
{ /* Begin unrolled inner loop. */
|
||||||
|
|
||||||
|
/* Process a literal or copy item depending on the next control bit. */
|
||||||
|
if (control&1)
|
||||||
|
{
|
||||||
|
/* Copy item. */
|
||||||
|
|
||||||
|
register UBYTE *p; /* Points to place from which to copy. */
|
||||||
|
register UCARD lenmt; /* Length of copy item minus three. */
|
||||||
|
register UBYTE *p_ziv=p_dst; /* Pointer to start of current Ziv. */
|
||||||
|
register UCARD index; /* Index of hash table copy pointer. */
|
||||||
|
|
||||||
|
/* Read and dismantle the copy word. Work out from where to copy. */
|
||||||
|
lenmt=*p_src++;
|
||||||
|
index=((lenmt&0xF0)<<4)|*p_src++;
|
||||||
|
p=hash[index];
|
||||||
|
lenmt&=0xF;
|
||||||
|
|
||||||
|
/* Check for destination buffer for overflow before writing data. */
|
||||||
|
if (dst_max && (dst_max < p_dst-p_dst_first+lenmt+3))
|
||||||
|
goto dst_overrun;
|
||||||
|
|
||||||
|
/* Now perform the copy using a half unrolled loop. */
|
||||||
|
*p_dst++=*p++;
|
||||||
|
*p_dst++=*p++;
|
||||||
|
*p_dst++=*p++;
|
||||||
|
while (lenmt--)
|
||||||
|
*p_dst++=*p++;
|
||||||
|
|
||||||
|
/* Because we have just received 3 or more bytes in a copy item */
|
||||||
|
/* (whose bytes we have just installed in the output), we are now */
|
||||||
|
/* in a position to flush all the pending literal hashings that had */
|
||||||
|
/* been postponed for lack of bytes. */
|
||||||
|
if (literals>0)
|
||||||
|
{
|
||||||
|
register UBYTE *r=p_ziv-literals;;
|
||||||
|
UPDATE_I(HASH(r),r);
|
||||||
|
if (literals==2)
|
||||||
|
{r++; UPDATE_I(HASH(r),r);}
|
||||||
|
literals=0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* In any case, we can immediately update the hash table with the */
|
||||||
|
/* current position. We don't need to do a HASH(...) to work out */
|
||||||
|
/* where to put the pointer, as the compressor just told us!!! */
|
||||||
|
UPDATE_I(index&(~DEPTH_MASK),p_ziv);
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
/* Literal item. */
|
||||||
|
|
||||||
|
/* Check for destination buffer for overflow before writing data. */
|
||||||
|
if (dst_max && (dst_max < p_dst-p_dst_first+1))
|
||||||
|
goto dst_overrun;
|
||||||
|
|
||||||
|
/* Copy over the literal byte. */
|
||||||
|
*p_dst++=*p_src++;
|
||||||
|
|
||||||
|
/* If we now have three literals waiting to be hashed into the hash */
|
||||||
|
/* table, we can do one of them now (because there are three). */
|
||||||
|
if (++literals == 3)
|
||||||
|
{register UBYTE *p=p_dst-3;
|
||||||
|
UPDATE_I(HASH(p),p); literals=2;}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Shift the control buffer so the next control bit is in bit 0. */
|
||||||
|
control>>=1;
|
||||||
|
|
||||||
|
} /* End unrolled inner loop. */
|
||||||
|
|
||||||
|
} /* End of outer loop */
|
||||||
|
|
||||||
|
/* Write the length of the decompressed data before returning. */
|
||||||
|
*p_dst_len=p_dst-p_dst_first;
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
/* Jump here if the destination buffer is insufficient to hold the output */
|
||||||
|
/* data. We return -1 to indicate an error and set the output length to 0. */
|
||||||
|
dst_overrun:
|
||||||
|
*p_dst_len = 0;
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/******************************************************************************/
|
||||||
|
/* End of LZRW3-A.C */
|
||||||
|
/******************************************************************************/
|
||||||
|
|
||||||
175
compress.h
Executable file
175
compress.h
Executable file
@ -0,0 +1,175 @@
|
|||||||
|
/******************************************************************************/
|
||||||
|
/* */
|
||||||
|
/* COMPRESS.H */
|
||||||
|
/* */
|
||||||
|
/******************************************************************************/
|
||||||
|
/* */
|
||||||
|
/* Author : Ross Williams. */
|
||||||
|
/* Date : December 1989. */
|
||||||
|
/* */
|
||||||
|
/* This header file defines the interface to a set of functions called */
|
||||||
|
/* 'compress', each member of which implements a particular data compression */
|
||||||
|
/* algorithm. */
|
||||||
|
/* */
|
||||||
|
/* Normally in C programming, for each .H file, there is a corresponding .C */
|
||||||
|
/* file that implements the functions promised in the .H file. */
|
||||||
|
/* Here, there are many .C files corresponding to this header file. */
|
||||||
|
/* Each comforming implementation file contains a single function */
|
||||||
|
/* called 'compress' that implements a single data compression */
|
||||||
|
/* algorithm that conforms with the interface specified in this header file. */
|
||||||
|
/* Only one algorithm can be linked in at a time in this organization. */
|
||||||
|
/* */
|
||||||
|
/******************************************************************************/
|
||||||
|
/* */
|
||||||
|
/* DEFINITION OF FUNCTION COMPRESS */
|
||||||
|
/* =============================== */
|
||||||
|
/* */
|
||||||
|
/* Summary of Function Compress */
|
||||||
|
/* ---------------------------- */
|
||||||
|
/* The action that 'compress' takes depends on its first argument called */
|
||||||
|
/* 'action'. The function provides three actions: */
|
||||||
|
/* */
|
||||||
|
/* - Return information about the algorithm. */
|
||||||
|
/* - Compress a block of memory. */
|
||||||
|
/* - Decompress a block of memory. */
|
||||||
|
/* */
|
||||||
|
/* Parameters */
|
||||||
|
/* ---------- */
|
||||||
|
/* See the formal C definition later for a description of the parameters. */
|
||||||
|
/* */
|
||||||
|
/* Constants */
|
||||||
|
/* --------- */
|
||||||
|
/* COMPRESS_OVERRUN: The constant COMPRESS_OVERRUN defines by how many bytes */
|
||||||
|
/* an algorithm is allowed to expand a block during a compression operation. */
|
||||||
|
/* */
|
||||||
|
/* Although compression algorithms usually compress data, there will always */
|
||||||
|
/* be data that a given compressor will expand (this can be proven). */
|
||||||
|
/* Fortunately, the degree of expansion can be limited to a single bit, by */
|
||||||
|
/* copying over the input data if the data gets bigger during compression. */
|
||||||
|
/* To allow for this possibility, the first bit of a compressed */
|
||||||
|
/* representation can be used as a flag indicating whether the */
|
||||||
|
/* input data was copied over, or truly compressed. In practice, the first */
|
||||||
|
/* byte would be used to store this bit so as to maintain byte alignment. */
|
||||||
|
/* */
|
||||||
|
/* Unfortunately, in general, the only way to tell if an algorithm will */
|
||||||
|
/* expand a particular block of data is to run the algorithm on the data. */
|
||||||
|
/* If the algorithm does not continuously monitor how many output bytes it */
|
||||||
|
/* has written, it might write an output block far larger than the input */
|
||||||
|
/* block before realizing that it has done so. */
|
||||||
|
/* On the other hand, continuous checks on output length are inefficient. */
|
||||||
|
/* */
|
||||||
|
/* To cater for all these problems, this interface definition: */
|
||||||
|
/* > Allows a compression algorithm to return an output block that is up to */
|
||||||
|
/* COMPRESS_OVERRUN bytes longer than the input block. */
|
||||||
|
/* > Allows a compression algorithm to write up to COMPRESS_OVERRUN bytes */
|
||||||
|
/* more than the length of the input block to the memory of the output */
|
||||||
|
/* block regardless of the length of the output block eventually returned. */
|
||||||
|
/* This allows an algorithm to overrun the length of the input block in the */
|
||||||
|
/* output block by up to COMPRESS_OVERRUN bytes between expansion checks. */
|
||||||
|
/* */
|
||||||
|
/* The problem does not arise for decompression. */
|
||||||
|
/* */
|
||||||
|
/* Identity Action */
|
||||||
|
/* --------------- */
|
||||||
|
/* > action must be COMPRESS_ACTION_IDENTITY. */
|
||||||
|
/* > p_dst_len must point to a longword to receive a longword address. */
|
||||||
|
/* > The value of the other parameters does not matter. */
|
||||||
|
/* > After execution, the longword that p_dst_len points to will be a pointer */
|
||||||
|
/* to a structure of type compress_identity. */
|
||||||
|
/* Thus, for example, after the call, (*p_dst_len)->memory will return the */
|
||||||
|
/* number of bytes of working memory that the algorithm requires to run. */
|
||||||
|
/* > The values of the identity structure returned are fixed constant */
|
||||||
|
/* attributes of the algorithm and must not vary from call to call. */
|
||||||
|
/* */
|
||||||
|
/* Common Requirements for Compression and Decompression Actions */
|
||||||
|
/* ------------------------------------------------------------- */
|
||||||
|
/* > wrk_mem must point to an unused block of memory of a length specified in */
|
||||||
|
/* the algorithm's identity block. The identity block can be obtained by */
|
||||||
|
/* making a separate call to compress, specifying the identity action. */
|
||||||
|
/* > The INPUT BLOCK is defined to be Memory[src_addr,src_addr+src_len-1]. */
|
||||||
|
/* > dst_len will be used to denote *p_dst_len. */
|
||||||
|
/* > dst_len is not read by compress, only written. */
|
||||||
|
/* > The value of dst_len is defined only upon termination. */
|
||||||
|
/* > The OUTPUT BLOCK is defined to be Memory[dst_addr,dst_addr+dst_len-1]. */
|
||||||
|
/* */
|
||||||
|
/* Compression Action */
|
||||||
|
/* ------------------ */
|
||||||
|
/* > action must be COMPRESS_ACTION_COMPRESS. */
|
||||||
|
/* > src_len must be in the range [0,COMPRESS_MAX_ORG]. */
|
||||||
|
/* > The OUTPUT ZONE is defined to be */
|
||||||
|
/* Memory[dst_addr,dst_addr+src_len-1+COMPRESS_OVERRUN]. */
|
||||||
|
/* > The function can modify any part of the output zone regardless of the */
|
||||||
|
/* final length of the output block. */
|
||||||
|
/* > The input block and the output zone must not overlap. */
|
||||||
|
/* > dst_len will be in the range [0,src_len+COMPRESS_OVERRUN]. */
|
||||||
|
/* > dst_len will be in the range [0,COMPRESS_MAX_COM] (from prev fact). */
|
||||||
|
/* > The output block will consist of a representation of the input block. */
|
||||||
|
/* */
|
||||||
|
/* Decompression Action */
|
||||||
|
/* -------------------- */
|
||||||
|
/* > action must be COMPRESS_ACTION_DECOMPRESS. */
|
||||||
|
/* > The input block must be the result of an earlier compression operation. */
|
||||||
|
/* > If the previous fact is true, the following facts must also be true: */
|
||||||
|
/* > src_len will be in the range [0,COMPRESS_MAX_COM]. */
|
||||||
|
/* > dst_len will be in the range [0,COMPRESS_MAX_ORG]. */
|
||||||
|
/* > The input and output blocks must not overlap. */
|
||||||
|
/* > Only the output block is modified. */
|
||||||
|
/* > Upon termination, the output block will consist of the bytes contained */
|
||||||
|
/* in the input block passed to the earlier compression operation. */
|
||||||
|
/* */
|
||||||
|
/******************************************************************************/
|
||||||
|
|
||||||
|
#include "port.h"
|
||||||
|
|
||||||
|
#define COMPRESS_ACTION_IDENTITY 0
|
||||||
|
#define COMPRESS_ACTION_COMPRESS 1
|
||||||
|
#define COMPRESS_ACTION_DECOMPRESS 2
|
||||||
|
|
||||||
|
#define COMPRESS_OVERRUN 1024
|
||||||
|
#define COMPRESS_MAX_COM 0x70000000
|
||||||
|
#define COMPRESS_MAX_ORG (COMPRESS_MAX_COM-COMPRESS_OVERRUN)
|
||||||
|
|
||||||
|
#define COMPRESS_MAX_STRLEN 255
|
||||||
|
//#ifndef __MWERKS__
|
||||||
|
extern "C"{
|
||||||
|
//#endif
|
||||||
|
/* The following structure provides information about the algorithm. */
|
||||||
|
/* > The top bit of id must be zero. The remaining bits must be chosen by */
|
||||||
|
/* the author of the algorithm by tossing a coin 31 times. */
|
||||||
|
/* > The amount of memory requested by the algorithm is specified in bytes */
|
||||||
|
/* and must be in the range [0,0x70000000]. */
|
||||||
|
/* > All strings s must be such that strlen(s)<=COMPRESS_MAX_STRLEN. */
|
||||||
|
typedef struct
|
||||||
|
{
|
||||||
|
ULONG id; /* Identifying number of algorithm. */
|
||||||
|
ULONG memory; /* Number of bytes of working memory required. */
|
||||||
|
|
||||||
|
char *name; /* Name of algorithm. */
|
||||||
|
char *version; /* Version number. */
|
||||||
|
char *date; /* Date of release of this version. */
|
||||||
|
char *copyright; /* Copyright message. */
|
||||||
|
|
||||||
|
char *author; /* Author of algorithm. */
|
||||||
|
char *affiliation; /* Affiliation of author. */
|
||||||
|
char *vendor; /* Where the algorithm can be obtained. */
|
||||||
|
}compress_identity;
|
||||||
|
|
||||||
|
int xcompress( /* Single function interface to compression algorithm. */
|
||||||
|
UWORD action, /* Action to be performed. */
|
||||||
|
UBYTE *wrk_mem, /* Working memory temporarily given to routine to use. */
|
||||||
|
UBYTE *src_adr, /* Address of input data. */
|
||||||
|
ULONG src_len, /* Length of input data. */
|
||||||
|
ULONG dst_max, /* Allocated length of output buffer. */
|
||||||
|
UBYTE *dst_adr, /* Address of output data. */
|
||||||
|
ULONG *p_dst_len /* Pointer to a longword where routine will write: */
|
||||||
|
/* If action=..IDENTITY => Adr of id structure. */
|
||||||
|
/* If action=..COMPRESS => Length of output data. */
|
||||||
|
/* If action=..DECOMPRESS => Length of output data. */
|
||||||
|
);
|
||||||
|
//#ifndef __MWERKS__
|
||||||
|
}
|
||||||
|
//#endif
|
||||||
|
/******************************************************************************/
|
||||||
|
/* End of COMPRESS.H */
|
||||||
|
/******************************************************************************/
|
||||||
|
|
||||||
@ -19,6 +19,7 @@
|
|||||||
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||||||
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||||||
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||||||
|
7489D6211CB005370063AC48 /* LZRW3-A.C in Sources */ = {isa = PBXBuildFile; fileRef = 7489D61F1CB005370063AC48 /* LZRW3-A.C */; settings = {ASSET_TAGS = (); }; };
|
||||||
7F06105A0876ED46001EA95C /* ai.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 7F060FE50876ED46001EA95C /* ai.cpp */; };
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7F06105A0876ED46001EA95C /* ai.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 7F060FE50876ED46001EA95C /* ai.cpp */; };
|
||||||
7F06105D0876ED46001EA95C /* carphysics.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 7F060FEA0876ED46001EA95C /* carphysics.cpp */; };
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7F06105D0876ED46001EA95C /* carphysics.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 7F060FEA0876ED46001EA95C /* carphysics.cpp */; };
|
||||||
7F06105E0876ED46001EA95C /* carselection.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 7F060FEC0876ED46001EA95C /* carselection.cpp */; };
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7F06105E0876ED46001EA95C /* carselection.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 7F060FEC0876ED46001EA95C /* carselection.cpp */; };
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||||||
@ -69,7 +70,6 @@
|
|||||||
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7F0610960876ED46001EA95C /* vectors.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 7F0610550876ED46001EA95C /* vectors.cpp */; };
|
||||||
7F0610970876ED46001EA95C /* writeout.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 7F0610570876ED46001EA95C /* writeout.cpp */; };
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7F0610970876ED46001EA95C /* writeout.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 7F0610570876ED46001EA95C /* writeout.cpp */; };
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||||||
7F06138F08770577001EA95C /* interface.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 7F06138E08770577001EA95C /* interface.cpp */; };
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7F06138F08770577001EA95C /* interface.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 7F06138E08770577001EA95C /* interface.cpp */; };
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||||||
7F0613BB08771263001EA95C /* LZRW3-A.C in Sources */ = {isa = PBXBuildFile; fileRef = 7F0613B908771263001EA95C /* LZRW3-A.C */; };
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|
||||||
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|
||||||
7F434A4F0973EC9900C3981C /* HID_cookie_strings.plist in Resources */ = {isa = PBXBuildFile; fileRef = 7F434A4C0973EC9900C3981C /* HID_cookie_strings.plist */; };
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7F434A4F0973EC9900C3981C /* HID_cookie_strings.plist in Resources */ = {isa = PBXBuildFile; fileRef = 7F434A4C0973EC9900C3981C /* HID_cookie_strings.plist */; };
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||||||
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7F434A500973EC9900C3981C /* HID_device_usage_strings.plist in Resources */ = {isa = PBXBuildFile; fileRef = 7F434A4D0973EC9900C3981C /* HID_device_usage_strings.plist */; };
|
||||||
@ -122,6 +122,10 @@
|
|||||||
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||||||
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||||||
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||||||
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7489D61D1CB005370063AC48 /* compress.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = compress.h; sourceTree = "<group>"; };
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||||||
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7489D61E1CB005370063AC48 /* LZRW.H */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = LZRW.H; sourceTree = "<group>"; };
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||||||
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||||||
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||||||
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||||||
7F060FEA0876ED46001EA95C /* carphysics.cpp */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.cpp.cpp; path = carphysics.cpp; sourceTree = "<group>"; };
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7F060FEA0876ED46001EA95C /* carphysics.cpp */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.cpp.cpp; path = carphysics.cpp; sourceTree = "<group>"; };
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||||||
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||||||
@ -218,10 +222,6 @@
|
|||||||
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||||||
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||||||
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||||||
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||||||
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|
||||||
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|
||||||
7F0613BA08771263001EA95C /* port.h */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.c.h; name = port.h; path = ../packer/port.h; sourceTree = SOURCE_ROOT; };
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|
||||||
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||||||
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||||||
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|
||||||
@ -501,10 +501,10 @@
|
|||||||
7F0613AC08771244001EA95C /* lzrw */ = {
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||||||
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||||||
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||||||
7F0613B708771262001EA95C /* compress.h */,
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||||||
7F0613B808771263001EA95C /* LZRW.H */,
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7489D61E1CB005370063AC48 /* LZRW.H */,
|
||||||
7F0613B908771263001EA95C /* LZRW3-A.C */,
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7489D61F1CB005370063AC48 /* LZRW3-A.C */,
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||||||
7F0613BA08771263001EA95C /* port.h */,
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7489D6201CB005370063AC48 /* port.h */,
|
||||||
);
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);
|
||||||
name = lzrw;
|
name = lzrw;
|
||||||
sourceTree = "<group>";
|
sourceTree = "<group>";
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||||||
@ -653,6 +653,7 @@
|
|||||||
7F0610850876ED46001EA95C /* random.cpp in Sources */,
|
7F0610850876ED46001EA95C /* random.cpp in Sources */,
|
||||||
7F0610860876ED46001EA95C /* rendercar.cpp in Sources */,
|
7F0610860876ED46001EA95C /* rendercar.cpp in Sources */,
|
||||||
7F0610870876ED46001EA95C /* renderframe.cpp in Sources */,
|
7F0610870876ED46001EA95C /* renderframe.cpp in Sources */,
|
||||||
|
7489D6211CB005370063AC48 /* LZRW3-A.C in Sources */,
|
||||||
7F0610880876ED46001EA95C /* roads.cpp in Sources */,
|
7F0610880876ED46001EA95C /* roads.cpp in Sources */,
|
||||||
7F0610890876ED46001EA95C /* screen.cpp in Sources */,
|
7F0610890876ED46001EA95C /* screen.cpp in Sources */,
|
||||||
7F06108A0876ED46001EA95C /* sky.cpp in Sources */,
|
7F06108A0876ED46001EA95C /* sky.cpp in Sources */,
|
||||||
@ -668,7 +669,6 @@
|
|||||||
7F0610960876ED46001EA95C /* vectors.cpp in Sources */,
|
7F0610960876ED46001EA95C /* vectors.cpp in Sources */,
|
||||||
7F0610970876ED46001EA95C /* writeout.cpp in Sources */,
|
7F0610970876ED46001EA95C /* writeout.cpp in Sources */,
|
||||||
7F06138F08770577001EA95C /* interface.cpp in Sources */,
|
7F06138F08770577001EA95C /* interface.cpp in Sources */,
|
||||||
7F0613BB08771263001EA95C /* LZRW3-A.C in Sources */,
|
|
||||||
7FD85B0708BC760A00C3EB17 /* S3Decompression.cpp in Sources */,
|
7FD85B0708BC760A00C3EB17 /* S3Decompression.cpp in Sources */,
|
||||||
7FD85E2308BC9B8400C3EB17 /* fpu_exc.c in Sources */,
|
7FD85E2308BC9B8400C3EB17 /* fpu_exc.c in Sources */,
|
||||||
7F4348C7096D9B5B00C3981C /* GetPID.c in Sources */,
|
7F4348C7096D9B5B00C3981C /* GetPID.c in Sources */,
|
||||||
|
|||||||
42
port.h
Executable file
42
port.h
Executable file
@ -0,0 +1,42 @@
|
|||||||
|
/******************************************************************************/
|
||||||
|
/* */
|
||||||
|
/* PORT.H */
|
||||||
|
/* */
|
||||||
|
/******************************************************************************/
|
||||||
|
/* */
|
||||||
|
/* This module contains macro definitions and types that are likely to */
|
||||||
|
/* change between computers. */
|
||||||
|
/* */
|
||||||
|
/******************************************************************************/
|
||||||
|
|
||||||
|
#ifndef DONE_PORT /* Only do this if not previously done. */
|
||||||
|
|
||||||
|
#include <string.h>
|
||||||
|
|
||||||
|
// #ifdef THINK_C
|
||||||
|
#define UBYTE unsigned char /* Unsigned byte */
|
||||||
|
#define UWORD unsigned int /* Unsigned word (2 bytes) */
|
||||||
|
#define ULONG unsigned long /* Unsigned word (4 bytes) */
|
||||||
|
#define BOOL unsigned char /* Boolean */
|
||||||
|
#define FOPEN_BINARY_READ "rb" /* Mode string for binary reading. */
|
||||||
|
#define FOPEN_BINARY_WRITE "wb" /* Mode string for binary writing. */
|
||||||
|
#define FOPEN_TEXT_APPEND "a" /* Mode string for text appending. */
|
||||||
|
#define REAL double /* USed for floating point stuff. */
|
||||||
|
// #endif
|
||||||
|
|
||||||
|
#define DONE_PORT /* Don't do all this again. */
|
||||||
|
#define MALLOC_FAIL NULL /* Failure status from malloc() */
|
||||||
|
#define LOCAL static /* For non-exported routines. */
|
||||||
|
#define EXPORT /* Signals exported function. */
|
||||||
|
#define then /* Useful for aligning ifs. */
|
||||||
|
#ifndef TRUE
|
||||||
|
#define TRUE true
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#define fast_copy(src,dst,len) memcpy(dst,src,len)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/******************************************************************************/
|
||||||
|
/* End of PORT.H */
|
||||||
|
/******************************************************************************/
|
||||||
|
|
||||||
Loading…
Reference in New Issue
Block a user