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https://github.com/jart/cosmopolitan.git
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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
116 lines
4.4 KiB
C
116 lines
4.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.internal.h"
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#include "libc/str/str.h"
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#include "libc/str/tab.internal.h"
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#include "libc/sysv/errfuns.h"
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#include "net/http/escape.h"
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#include "net/http/http.h"
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/**
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* Removes chunk transfer encoding from message body in place.
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*
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* @param p is modified in place
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* @param l receives content length if not null
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* @return bytes processed, 0 if need more data, or -1 on failure
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*/
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ssize_t Unchunk(struct HttpUnchunker *u, char *p, size_t n, size_t *l) {
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int c, h;
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size_t s;
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while (u->i < n) {
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c = p[u->i++] & 255;
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switch (u->t) {
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case kHttpStateChunkStart:
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if ((u->m = kHexToInt[c]) == -1) return ebadmsg();
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u->t = kHttpStateChunkSize;
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break;
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case kHttpStateChunkSize:
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if ((h = kHexToInt[c]) != -1) {
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u->m *= 16;
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u->m += h;
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if (u->m >= 0x0000010000000000) return ebadmsg();
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break;
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}
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u->t = kHttpStateChunkExt;
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/* fallthrough */
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case kHttpStateChunkExt:
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if (c == '\r') {
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u->t = kHttpStateChunkLf1;
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break;
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} else if (c != '\n') {
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break;
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}
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/* fallthrough */
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case kHttpStateChunkLf1:
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if (c != '\n') return ebadmsg();
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u->t = u->m ? kHttpStateChunk : kHttpStateTrailerStart;
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break;
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case kHttpStateChunk:
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p[u->j++] = c, --u->m;
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s = MIN(u->m, n - u->i);
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memmove(p + u->j, p + u->i, s);
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u->i += s;
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u->j += s;
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u->m -= s;
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if (!u->m) u->t = kHttpStateChunkCr2;
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break;
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case kHttpStateChunkCr2:
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if (c == '\r') {
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u->t = kHttpStateChunkLf2;
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break;
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}
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/* fallthrough */
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case kHttpStateChunkLf2:
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if (c != '\n') return ebadmsg();
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u->t = kHttpStateChunkStart;
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break;
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case kHttpStateTrailerStart:
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if (c == '\r') {
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u->t = kHttpStateTrailerLf2;
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break;
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} else if (c == '\n') {
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goto Finished;
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}
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u->t = kHttpStateTrailer;
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/* fallthrough */
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case kHttpStateTrailer:
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if (c == '\r') {
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u->t = kHttpStateTrailerLf1;
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break;
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} else if (c != '\n') {
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break;
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}
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/* fallthrough */
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case kHttpStateTrailerLf1:
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if (c != '\n') return ebadmsg();
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u->t = kHttpStateTrailerStart;
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break;
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case kHttpStateTrailerLf2:
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if (c != '\n') return ebadmsg();
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Finished:
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if (l) *l = u->j;
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if (u->j < n) p[u->j] = 0;
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return u->i;
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break;
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default:
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__builtin_unreachable();
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}
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}
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return 0;
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}
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