Partial re-implementation of parse.
This commit is contained in:
Michael Jumper
parent
abc676ef13
commit
1a598db7a1
@ -161,37 +161,21 @@ struct guac_socket {
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char __out_buf[GUAC_SOCKET_OUTPUT_BUFFER_SIZE];
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/**
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* The current location of parsing within the instruction buffer.
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* The number of bytes currently available within the instruction buffer.
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*/
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int __instructionbuf_parse_start;
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int __instructionbuf_available;
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/**
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* The current size of the instruction buffer.
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* Pointer to the first unused section of the instruction buffer.
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*/
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int __instructionbuf_size;
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/**
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* The number of bytes currently in the instruction buffer.
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*/
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int __instructionbuf_used_length;
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char* __instructionbuf_current;
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/**
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* The instruction buffer. This is essentially the input buffer,
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* provided as a convenience to be used to buffer instructions until
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* those instructions are complete and ready to be parsed.
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*/
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char* __instructionbuf;
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/**
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* The number of elements parsed so far.
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*/
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int __instructionbuf_elementc;
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/**
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* Array of pointers into the instruction buffer, where each pointer
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* points to the start of the corresponding element.
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*/
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char* __instructionbuf_elementv[64];
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char __instructionbuf[32768];
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/**
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* Whether instructions should be guaranteed atomic across threads using
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@ -153,229 +153,78 @@ int guac_instruction_append(guac_instruction* instr,
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}
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int __guac_fill_instructionbuf(guac_socket* socket) {
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int retval;
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/* Attempt to fill buffer */
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retval = guac_socket_read(
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socket,
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socket->__instructionbuf + socket->__instructionbuf_used_length,
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socket->__instructionbuf_size - socket->__instructionbuf_used_length
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);
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/* Set guac_error if recv() unsuccessful */
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if (retval < 0) {
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guac_error = GUAC_STATUS_SEE_ERRNO;
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guac_error_message = "Error filling instruction buffer";
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return retval;
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}
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socket->__instructionbuf_used_length += retval;
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/* Expand buffer if necessary */
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if (socket->__instructionbuf_used_length >
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socket->__instructionbuf_size / 2) {
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socket->__instructionbuf_size *= 2;
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socket->__instructionbuf = realloc(socket->__instructionbuf,
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socket->__instructionbuf_size);
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}
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return retval;
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}
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/* Returns new instruction if one exists, or NULL if no more instructions. */
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guac_instruction* guac_instruction_read(guac_socket* socket,
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int usec_timeout) {
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int retval;
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char* buffer = socket->__instructionbuf_current;
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int length = socket->__instructionbuf_available;
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/* Loop until a instruction is read */
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for (;;) {
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guac_instruction* instruction = guac_instruction_alloc();
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/* Length of element, in Unicode characters */
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int element_length = 0;
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while (instruction->state != GUAC_INSTRUCTION_PARSE_COMPLETE
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&& instruction->state != GUAC_INSTRUCTION_PARSE_ERROR) {
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/* Length of element, in bytes */
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int element_byte_length = 0;
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/* Add any available data to buffer */
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int parsed = guac_instruction_append(instruction, buffer, length);
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/* Current position within the element, in Unicode characters */
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int current_unicode_length = 0;
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/* Read more data if not enough data to parse */
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if (parsed == 0) {
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/* Position within buffer */
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int i = socket->__instructionbuf_parse_start;
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int retval;
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/* Parse instruction in buffer */
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while (i < socket->__instructionbuf_used_length) {
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/* Read character from buffer */
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char c = socket->__instructionbuf[i++];
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/* If digit, calculate element length */
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if (c >= '0' && c <= '9')
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element_length = element_length * 10 + c - '0';
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/* Otherwise, if end of length */
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else if (c == '.') {
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/* Calculate element byte length by walking buffer */
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while (i + element_byte_length <
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socket->__instructionbuf_used_length
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&& current_unicode_length < element_length) {
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/* Get next byte */
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c = socket->__instructionbuf[i + element_byte_length];
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/* Update byte and character lengths */
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element_byte_length += guac_utf8_charsize((unsigned) c);
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current_unicode_length++;
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}
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/* Verify element is fully read */
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if (current_unicode_length == element_length) {
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/* Get element value */
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char* elementv = &(socket->__instructionbuf[i]);
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/* Get terminator, set null terminator of elementv */
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char terminator = elementv[element_byte_length];
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elementv[element_byte_length] = '\0';
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/* Move to char after terminator of element */
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i += element_byte_length+1;
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/* Reset element length */
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element_length =
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element_byte_length =
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current_unicode_length = 0;
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/* As element has been read successfully, update
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* parse start */
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socket->__instructionbuf_parse_start = i;
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/* Save element */
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socket->__instructionbuf_elementv[socket->__instructionbuf_elementc++] = elementv;
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/* Finish parse if terminator is a semicolon */
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if (terminator == ';') {
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guac_instruction* parsed_instruction;
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int j;
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/* Allocate instruction */
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parsed_instruction = malloc(sizeof(guac_instruction));
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if (parsed_instruction == NULL) {
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guac_error = GUAC_STATUS_NO_MEMORY;
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guac_error_message = "Could not allocate memory for parsed instruction";
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return NULL;
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}
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/* Init parsed instruction */
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parsed_instruction->argc = socket->__instructionbuf_elementc - 1;
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parsed_instruction->argv = malloc(sizeof(char*) * parsed_instruction->argc);
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/* Fail if memory could not be alloc'd for argv */
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if (parsed_instruction->argv == NULL) {
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guac_error = GUAC_STATUS_NO_MEMORY;
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guac_error_message = "Could not allocate memory for arguments of parsed instruction";
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free(parsed_instruction);
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return NULL;
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}
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/* Set opcode */
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parsed_instruction->opcode = strdup(socket->__instructionbuf_elementv[0]);
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/* Fail if memory could not be alloc'd for opcode */
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if (parsed_instruction->opcode == NULL) {
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guac_error = GUAC_STATUS_NO_MEMORY;
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guac_error_message = "Could not allocate memory for opcode of parsed instruction";
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free(parsed_instruction->argv);
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free(parsed_instruction);
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return NULL;
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}
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/* Copy element values to parsed instruction */
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for (j=0; j<parsed_instruction->argc; j++) {
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parsed_instruction->argv[j] = strdup(socket->__instructionbuf_elementv[j+1]);
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/* Free memory and fail if out of mem */
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if (parsed_instruction->argv[j] == NULL) {
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guac_error = GUAC_STATUS_NO_MEMORY;
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guac_error_message = "Could not allocate memory for single argument of parsed instruction";
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/* Free all alloc'd argv values */
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while (--j >= 0)
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free(parsed_instruction->argv[j]);
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free(parsed_instruction->opcode);
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free(parsed_instruction->argv);
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free(parsed_instruction);
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return NULL;
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}
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}
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/* Reset buffer */
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memmove(socket->__instructionbuf, socket->__instructionbuf + i, socket->__instructionbuf_used_length - i);
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socket->__instructionbuf_used_length -= i;
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socket->__instructionbuf_parse_start = 0;
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socket->__instructionbuf_elementc = 0;
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/* Done */
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return parsed_instruction;
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} /* end if terminator */
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/* Error if expected comma is not present */
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else if (terminator != ',') {
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guac_error = GUAC_STATUS_BAD_ARGUMENT;
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guac_error_message = "Element terminator of instruction was not ';' nor ','";
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return NULL;
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}
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} /* end if element fully read */
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/* Otherwise, read more data */
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else
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break;
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}
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/* Error if length is non-numeric or does not end in a period */
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else {
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guac_error = GUAC_STATUS_BAD_ARGUMENT;
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guac_error_message = "Non-numeric character in element length";
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/* If no space left to read, fail */
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if (length == 0) {
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guac_error = GUAC_STATUS_NO_MEMORY;
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guac_error_message = "Instruction too long";
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return NULL;
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}
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/* No instruction yet? Get more data ... */
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retval = guac_socket_select(socket, usec_timeout);
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if (retval <= 0)
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return NULL;
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/* Attempt to fill buffer */
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retval = guac_socket_read(socket, buffer, length);
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/* Set guac_error if read unsuccessful */
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if (retval < 0) {
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guac_error = GUAC_STATUS_SEE_ERRNO;
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guac_error_message = "Error filling instruction buffer";
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return NULL;
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}
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/* EOF */
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if (retval == 0) {
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guac_error = GUAC_STATUS_NO_INPUT;
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guac_error_message = "End of stream reached while "
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"reading instruction";
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return NULL;
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}
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/* Update length of internal buffer */
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length -= retval;
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}
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/* No instruction yet? Get more data ... */
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retval = guac_socket_select(socket, usec_timeout);
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if (retval <= 0)
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return NULL;
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/* If data was parsed, advance buffer */
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else
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buffer += parsed;
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/* If more data is available, fill into buffer */
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retval = __guac_fill_instructionbuf(socket);
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/* Error, guac_error already set */
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if (retval < 0)
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return NULL;
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/* EOF */
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if (retval == 0) {
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guac_error = GUAC_STATUS_NO_INPUT;
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guac_error_message = "End of stream reached while reading instruction";
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return NULL;
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}
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} /* end while parsing data */
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/* Fail on error */
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if (instruction->state == GUAC_INSTRUCTION_PARSE_ERROR) {
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guac_error = GUAC_STATUS_BAD_ARGUMENT;
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guac_error_message = "Instruction parse error";
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return NULL;
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}
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socket->__instructionbuf_current = buffer;
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socket->__instructionbuf_available = length;
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return instruction;
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}
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@ -408,33 +257,13 @@ guac_instruction* guac_instruction_expect(guac_socket* socket, int usec_timeout,
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void guac_instruction_free(guac_instruction* instruction) {
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int argc = instruction->argc;
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/* Free opcode */
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free(instruction->opcode);
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/* Free argv if set (may be NULL of argc is 0) */
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if (instruction->argv) {
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/* All argument values */
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while (argc > 0)
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free(instruction->argv[--argc]);
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/* Free actual array */
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free(instruction->argv);
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}
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/* Free instruction */
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free(instruction);
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}
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int guac_instruction_waiting(guac_socket* socket, int usec_timeout) {
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if (socket->__instructionbuf_used_length > 0)
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if (socket->__instructionbuf_available < sizeof(socket->__instructionbuf))
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return 1;
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return guac_socket_select(socket, usec_timeout);
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@ -139,22 +139,9 @@ guac_socket* guac_socket_alloc() {
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socket->__written = 0;
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socket->data = NULL;
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/* Allocate instruction buffer */
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socket->__instructionbuf_size = 1024;
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socket->__instructionbuf = malloc(socket->__instructionbuf_size);
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/* If no memory available, return with error */
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if (socket->__instructionbuf == NULL) {
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guac_error = GUAC_STATUS_NO_MEMORY;
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guac_error_message = "Could not allocate memory for instruction buffer";
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free(socket);
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return NULL;
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}
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/* Init members */
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socket->__instructionbuf_used_length = 0;
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socket->__instructionbuf_parse_start = 0;
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socket->__instructionbuf_elementc = 0;
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socket->__instructionbuf_current = socket->__instructionbuf;
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socket->__instructionbuf_available = sizeof(socket->__instructionbuf);
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/* Default to unsafe threading */
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socket->__threadsafe_instructions = 0;
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@ -219,7 +206,6 @@ void guac_socket_free(guac_socket* socket) {
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guac_socket_flush(socket);
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pthread_mutex_destroy(&(socket->__instruction_write_lock));
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free(socket->__instructionbuf);
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free(socket);
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}
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