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Add chunked transfer decoding to redbean

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This commit is contained in:
Justine Tunney 2021-07-05 01:03:45 -07:00
parent 8d5f60a9cd
commit 58fb2fb3d3
13 changed files with 693 additions and 292 deletions
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115
net/http/unchunk.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/macros.internal.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"
#include "net/http/escape.h"
#include "net/http/http.h"
/**
* Removes chunk transfer encoding from message body in place.
*
* @param p is modified in place
* @param l receives content length if not null
* @return bytes processed, 0 if need more data, or -1 on failure
*/
ssize_t Unchunk(struct HttpUnchunker *u, char *p, size_t n, size_t *l) {
int c, h;
size_t s;
while (u->i < n) {
c = p[u->i++] & 255;
switch (u->t) {
case kHttpStateChunkStart:
if ((u->m = kHexToInt[c]) == -1) return ebadmsg();
u->t = kHttpStateChunkSize;
break;
case kHttpStateChunkSize:
if ((h = kHexToInt[c]) != -1) {
u->m *= 16;
u->m += h;
if (u->i + u->m >= n) return ebadmsg();
break;
}
u->t = kHttpStateChunkExt;
/* fallthrough */
case kHttpStateChunkExt:
if (c == '\r') {
u->t = kHttpStateChunkLf1;
break;
} else if (c != '\n') {
break;
}
/* fallthrough */
case kHttpStateChunkLf1:
if (c != '\n') return ebadmsg();
u->t = u->m ? kHttpStateChunk : kHttpStateTrailerStart;
break;
case kHttpStateChunk:
p[u->j++] = c, --u->m;
s = MIN(u->m, n - u->i);
memmove(p + u->j, p + u->i, s);
u->i += s;
u->j += s;
u->m -= s;
if (!u->m) u->t = kHttpStateChunkCr2;
break;
case kHttpStateChunkCr2:
if (c == '\r') {
u->t = kHttpStateChunkLf2;
break;
}
/* fallthrough */
case kHttpStateChunkLf2:
if (c != '\n') return ebadmsg();
u->t = kHttpStateChunkStart;
break;
case kHttpStateTrailerStart:
if (c == '\r') {
u->t = kHttpStateTrailerLf2;
break;
} else if (c == '\n') {
goto Finished;
}
u->t = kHttpStateTrailer;
/* fallthrough */
case kHttpStateTrailer:
if (c == '\r') {
u->t = kHttpStateTrailerLf1;
break;
} else if (c != '\n') {
break;
}
/* fallthrough */
case kHttpStateTrailerLf1:
if (c != '\n') return ebadmsg();
u->t = kHttpStateTrailerStart;
break;
case kHttpStateTrailerLf2:
if (c != '\n') return ebadmsg();
Finished:
if (l) *l = u->j;
if (u->j < n) p[u->j] = 0;
return u->i;
break;
default:
unreachable;
}
}
return 0;
}