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80 lines
2.7 KiB
C
80 lines
2.7 KiB
C
/*-
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* Copyright 2012 Matthew Endsley
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* All rights reserved
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted providing that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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static const unsigned char http_chunk_state[] = {
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/* * LF CR HEX */
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0xC1, 0xC1, 0xC1, 1, /* s0: initial hex char */
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0xC1, 0xC1, 2, 0x81, /* s1: additional hex chars, followed by CR */
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0xC1, 0x83, 0xC1, 0xC1, /* s2: trailing LF */
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0xC1, 0xC1, 4, 0xC1, /* s3: CR after chunk block */
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0xC1, 0xC0, 0xC1, 0xC1, /* s4: LF after chunk block */
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};
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int http_parse_chunked(int* state, int *size, char ch)
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{
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int newstate, code = 0;
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switch (ch) {
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case '\n': code = 1; break;
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case '\r': code = 2; break;
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case '0': case '1': case '2': case '3':
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case '4': case '5': case '6': case '7':
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case '8': case '9': case 'a': case 'b':
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case 'c': case 'd': case 'e': case 'f':
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case 'A': case 'B': case 'C': case 'D':
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case 'E': case 'F': code = 3; break;
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}
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newstate = http_chunk_state[*state * 4 + code];
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*state = (newstate & 0xF);
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switch (newstate) {
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case 0xC0:
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return *size != 0;
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case 0xC1: /* error */
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*size = -1;
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return 0;
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case 0x01: /* initial char */
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*size = 0;
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/* fallthrough */
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case 0x81: /* size char */
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if (ch >= 'a')
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*size = *size * 16 + (ch - 'a' + 10);
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else if (ch >= 'A')
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*size = *size * 16 + (ch - 'A' + 10);
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else
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*size = *size * 16 + (ch - '0');
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break;
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case 0x83:
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return *size == 0;
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}
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return 1;
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}
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