guacamole-spice-protocol/libguac/src/guacio.c
2011-04-01 00:53:53 -07:00

302 lines
7.3 KiB
C

/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is libguac.
*
* The Initial Developer of the Original Code is
* Michael Jumper.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#ifdef __MINGW32__
#include <winsock2.h>
#else
#include <sys/select.h>
#endif
#include <time.h>
#include <sys/time.h>
#include "guacio.h"
char __GUACIO_BASE64_CHARACTERS[64] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/',
};
GUACIO* guac_open(int fd) {
GUACIO* io = malloc(sizeof(GUACIO));
io->ready = 0;
io->written = 0;
io->total_written = 0;
io->fd = fd;
/* Allocate instruction buffer */
io->instructionbuf_size = 1024;
io->instructionbuf = malloc(io->instructionbuf_size);
io->instructionbuf_used_length = 0;
return io;
}
void guac_close(GUACIO* io) {
guac_flush(io);
free(io->instructionbuf);
free(io);
}
/* Write bytes, limit rate */
ssize_t __guac_write(GUACIO* io, const char* buf, int count) {
int retval;
#ifdef __MINGW32__
/* MINGW32 WINSOCK only works with send() */
retval = send(io->fd, buf, count, 0);
#else
/* Use write() for all other platforms */
retval = write(io->fd, buf, count);
#endif
return retval;
}
ssize_t guac_write_int(GUACIO* io, long i) {
char buffer[128];
char* ptr = &(buffer[127]);
int nonneg;
/* Obtain non-negative value */
if (i < 0) nonneg = -i;
else nonneg = i;
/* Generate numeric string */
*ptr = 0;
do {
ptr--;
*ptr = '0' + (nonneg % 10);
nonneg /= 10;
} while (nonneg > 0 && ptr >= buffer);
/* Prepend with dash if negative */
if (i < 0 && ptr >= buffer) *(--ptr) = '-';
return guac_write_string(io, ptr);
}
ssize_t guac_write_string(GUACIO* io, const char* str) {
char* out_buf = io->out_buf;
int retval;
for (; *str != '\0'; str++) {
out_buf[io->written++] = *str;
io->total_written++;
/* Flush when necessary, return on error */
if (io->written > 8188 /* sizeof(out_buf) - 4 */) {
retval = __guac_write(io, out_buf, io->written);
if (retval < 0)
return retval;
io->written = 0;
}
}
return 0;
}
ssize_t __guac_write_base64_triplet(GUACIO* io, int a, int b, int c) {
char* out_buf = io->out_buf;
int retval;
/* Byte 1 */
out_buf[io->written++] = __GUACIO_BASE64_CHARACTERS[(a & 0xFC) >> 2]; /* [AAAAAA]AABBBB BBBBCC CCCCCC */
io->total_written++;
if (b >= 0) {
out_buf[io->written++] = __GUACIO_BASE64_CHARACTERS[((a & 0x03) << 4) | ((b & 0xF0) >> 4)]; /* AAAAAA[AABBBB]BBBBCC CCCCCC */
io->total_written++;
if (c >= 0) {
out_buf[io->written++] = __GUACIO_BASE64_CHARACTERS[((b & 0x0F) << 2) | ((c & 0xC0) >> 6)]; /* AAAAAA AABBBB[BBBBCC]CCCCCC */
out_buf[io->written++] = __GUACIO_BASE64_CHARACTERS[c & 0x3F]; /* AAAAAA AABBBB BBBBCC[CCCCCC] */
io->total_written += 2;
}
else {
out_buf[io->written++] = __GUACIO_BASE64_CHARACTERS[((b & 0x0F) << 2)]; /* AAAAAA AABBBB[BBBB--]------ */
out_buf[io->written++] = '='; /* AAAAAA AABBBB BBBB--[------] */
io->total_written += 2;
}
}
else {
out_buf[io->written++] = __GUACIO_BASE64_CHARACTERS[((a & 0x03) << 4)]; /* AAAAAA[AA----]------ ------ */
out_buf[io->written++] = '='; /* AAAAAA AA----[------]------ */
out_buf[io->written++] = '='; /* AAAAAA AA---- ------[------] */
io->total_written += 3;
}
/* At this point, 4 bytes have been io->written */
/* Flush when necessary, return on error */
if (io->written > 8188 /* sizeof(out_buf) - 4 */) {
retval = __guac_write(io, out_buf, io->written);
if (retval < 0)
return retval;
io->written = 0;
}
if (b < 0)
return 1;
if (c < 0)
return 2;
return 3;
}
ssize_t __guac_write_base64_byte(GUACIO* io, char buf) {
int* ready_buf = io->ready_buf;
int retval;
ready_buf[io->ready++] = buf & 0xFF;
/* Flush triplet */
if (io->ready == 3) {
retval = __guac_write_base64_triplet(io, ready_buf[0], ready_buf[1], ready_buf[2]);
if (retval < 0)
return retval;
io->ready = 0;
}
return 1;
}
ssize_t guac_write_base64(GUACIO* io, const void* buf, size_t count) {
int retval;
const char* char_buf = (const char*) buf;
const char* end = char_buf + count;
while (char_buf < end) {
retval = __guac_write_base64_byte(io, *(char_buf++));
if (retval < 0)
return retval;
}
return count;
}
ssize_t guac_flush(GUACIO* io) {
int retval;
/* Flush remaining bytes in buffer */
if (io->written > 0) {
retval = __guac_write(io, io->out_buf, io->written);
if (retval < 0)
return retval;
io->written = 0;
}
return 0;
}
ssize_t guac_flush_base64(GUACIO* io) {
int retval;
/* Flush triplet to output buffer */
while (io->ready > 0) {
retval = __guac_write_base64_byte(io, -1);
if (retval < 0)
return retval;
}
return 0;
}
int guac_select(GUACIO* io, int usec_timeout) {
fd_set fds;
struct timeval timeout;
if (usec_timeout < 0)
return select(io->fd + 1, &fds, NULL, NULL, NULL);
timeout.tv_sec = usec_timeout/1000000;
timeout.tv_usec = usec_timeout%1000000;
FD_ZERO(&fds);
FD_SET(io->fd, &fds);
return select(io->fd + 1, &fds, NULL, NULL, &timeout);
}