mirror of
https://github.com/unknownworlds/NS.git
synced 2024-12-01 00:32:06 +00:00
54a4ac5469
git-svn-id: https://unknownworlds.svn.cloudforge.com/ns1@85 67975925-1194-0748-b3d5-c16f83f1a3a1
354 lines
10 KiB
C
354 lines
10 KiB
C
/***************************************************************************
|
|
* _ _ ____ _
|
|
* Project ___| | | | _ \| |
|
|
* / __| | | | |_) | |
|
|
* | (__| |_| | _ <| |___
|
|
* \___|\___/|_| \_\_____|
|
|
*
|
|
* Copyright (C) 1998 - 2003, Daniel Stenberg, <daniel@haxx.se>, et al.
|
|
*
|
|
* This software is licensed as described in the file COPYING, which
|
|
* you should have received as part of this distribution. The terms
|
|
* are also available at http://curl.haxx.se/docs/copyright.html.
|
|
*
|
|
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
|
|
* copies of the Software, and permit persons to whom the Software is
|
|
* furnished to do so, under the terms of the COPYING file.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
* $Id: content_encoding.c,v 1.7 2003/04/22 22:32:02 bagder Exp $
|
|
***************************************************************************/
|
|
|
|
#include "setup.h"
|
|
|
|
#ifdef HAVE_LIBZ
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "urldata.h"
|
|
#include <curl/curl.h>
|
|
#include <curl/types.h>
|
|
#include "sendf.h"
|
|
|
|
#define DSIZ 0x10000 /* buffer size for decompressed data */
|
|
|
|
#define GZIP_MAGIC_0 0x1f
|
|
#define GZIP_MAGIC_1 0x8b
|
|
|
|
/* gzip flag byte */
|
|
#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
|
|
#define HEAD_CRC 0x02 /* bit 1 set: header CRC present */
|
|
#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
|
|
#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
|
|
#define COMMENT 0x10 /* bit 4 set: file comment present */
|
|
#define RESERVED 0xE0 /* bits 5..7: reserved */
|
|
|
|
static CURLcode
|
|
process_zlib_error(struct SessionHandle *data, z_stream *z)
|
|
{
|
|
if (z->msg)
|
|
failf (data, "Error while processing content unencoding.\n%s",
|
|
z->msg);
|
|
else
|
|
failf (data, "Error while processing content unencoding.\n"
|
|
"Unknown failure within decompression software.");
|
|
|
|
return CURLE_BAD_CONTENT_ENCODING;
|
|
}
|
|
|
|
static CURLcode
|
|
exit_zlib(z_stream *z, bool *zlib_init, CURLcode result)
|
|
{
|
|
inflateEnd(z);
|
|
*zlib_init = 0;
|
|
return result;
|
|
}
|
|
|
|
CURLcode
|
|
Curl_unencode_deflate_write(struct SessionHandle *data,
|
|
struct Curl_transfer_keeper *k,
|
|
ssize_t nread)
|
|
{
|
|
int status; /* zlib status */
|
|
int result; /* Curl_client_write status */
|
|
char decomp[DSIZ]; /* Put the decompressed data here. */
|
|
z_stream *z = &k->z; /* zlib state structure */
|
|
|
|
/* Initialize zlib? */
|
|
if (!k->zlib_init) {
|
|
z->zalloc = (alloc_func)Z_NULL;
|
|
z->zfree = (free_func)Z_NULL;
|
|
z->opaque = 0; /* of dubious use 08/27/02 jhrg */
|
|
if (inflateInit(z) != Z_OK)
|
|
return process_zlib_error(data, z);
|
|
k->zlib_init = 1;
|
|
}
|
|
|
|
/* Set the compressed input when this function is called */
|
|
z->next_in = (Bytef *)k->str;
|
|
z->avail_in = nread;
|
|
|
|
/* because the buffer size is fixed, iteratively decompress
|
|
and transfer to the client via client_write. */
|
|
for (;;) {
|
|
/* (re)set buffer for decompressed output for every iteration */
|
|
z->next_out = (Bytef *)&decomp[0];
|
|
z->avail_out = DSIZ;
|
|
|
|
status = inflate(z, Z_SYNC_FLUSH);
|
|
if (status == Z_OK || status == Z_STREAM_END) {
|
|
if (DSIZ - z->avail_out) {
|
|
result = Curl_client_write(data, CLIENTWRITE_BODY, decomp,
|
|
DSIZ - z->avail_out);
|
|
/* if !CURLE_OK, clean up, return */
|
|
if (result)
|
|
return exit_zlib(z, &k->zlib_init, result);
|
|
}
|
|
|
|
/* Done?; clean up, return */
|
|
if (status == Z_STREAM_END) {
|
|
if (inflateEnd(z) == Z_OK)
|
|
return exit_zlib(z, &k->zlib_init, result);
|
|
else
|
|
return exit_zlib(z, &k->zlib_init, process_zlib_error(data, z));
|
|
}
|
|
|
|
/* Done with these bytes, exit */
|
|
if (status == Z_OK && z->avail_in == 0 && z->avail_out > 0)
|
|
return result;
|
|
}
|
|
else { /* Error; exit loop, handle below */
|
|
return exit_zlib(z, &k->zlib_init, process_zlib_error(data, z));
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Skip over the gzip header */
|
|
static enum {
|
|
GZIP_OK,
|
|
GZIP_BAD,
|
|
GZIP_UNDERFLOW
|
|
} check_gzip_header(unsigned char const *data, ssize_t len, ssize_t *headerlen)
|
|
{
|
|
int method, flags;
|
|
const ssize_t totallen = len;
|
|
|
|
/* The shortest header is 10 bytes */
|
|
if (len < 10)
|
|
return GZIP_UNDERFLOW;
|
|
|
|
if ((data[0] != GZIP_MAGIC_0) || (data[1] != GZIP_MAGIC_1))
|
|
return GZIP_BAD;
|
|
|
|
method = data[2];
|
|
flags = data[3];
|
|
|
|
if (method != Z_DEFLATED || (flags & RESERVED) != 0) {
|
|
/* Can't handle this compression method or unknown flag */
|
|
return GZIP_BAD;
|
|
}
|
|
|
|
/* Skip over time, xflags, OS code and all previous bytes */
|
|
len -= 10;
|
|
data += 10;
|
|
|
|
if (flags & EXTRA_FIELD) {
|
|
ssize_t extra_len;
|
|
|
|
if (len < 2)
|
|
return GZIP_UNDERFLOW;
|
|
|
|
extra_len = (data[1] << 8) | data[0];
|
|
|
|
if (len < (extra_len+2))
|
|
return GZIP_UNDERFLOW;
|
|
|
|
len -= (extra_len + 2);
|
|
}
|
|
|
|
if (flags & ORIG_NAME) {
|
|
/* Skip over NUL-terminated file name */
|
|
while (len && *data) {
|
|
--len;
|
|
++data;
|
|
}
|
|
if (!len || *data)
|
|
return GZIP_UNDERFLOW;
|
|
|
|
/* Skip over the NUL */
|
|
--len;
|
|
++data;
|
|
}
|
|
|
|
if (flags & COMMENT) {
|
|
/* Skip over NUL-terminated comment */
|
|
while (len && *data) {
|
|
--len;
|
|
++data;
|
|
}
|
|
if (!len || *data)
|
|
return GZIP_UNDERFLOW;
|
|
|
|
/* Skip over the NUL */
|
|
--len;
|
|
++data;
|
|
}
|
|
|
|
if (flags & HEAD_CRC) {
|
|
if (len < 2)
|
|
return GZIP_UNDERFLOW;
|
|
|
|
len -= 2;
|
|
data += 2;
|
|
}
|
|
|
|
*headerlen = totallen - len;
|
|
return GZIP_OK;
|
|
}
|
|
|
|
CURLcode
|
|
Curl_unencode_gzip_write(struct SessionHandle *data,
|
|
struct Curl_transfer_keeper *k,
|
|
ssize_t nread)
|
|
{
|
|
int status; /* zlib status */
|
|
int result; /* Curl_client_write status */
|
|
char decomp[DSIZ]; /* Put the decompressed data here. */
|
|
z_stream *z = &k->z; /* zlib state structure */
|
|
|
|
/* Initialize zlib? */
|
|
if (!k->zlib_init) {
|
|
z->zalloc = (alloc_func)Z_NULL;
|
|
z->zfree = (free_func)Z_NULL;
|
|
z->opaque = 0; /* of dubious use 08/27/02 jhrg */
|
|
if (inflateInit2(z, -MAX_WBITS) != Z_OK)
|
|
return process_zlib_error(data, z);
|
|
k->zlib_init = 1; /* Initial call state */
|
|
}
|
|
|
|
/* This next mess is to get around the potential case where there isn't
|
|
enough data passed in to skip over the gzip header. If that happens,
|
|
we malloc a block and copy what we have then wait for the next call. If
|
|
there still isn't enough (this is definitely a worst-case scenario), we
|
|
make the block bigger, copy the next part in and keep waiting. */
|
|
|
|
/* Skip over gzip header? */
|
|
if (k->zlib_init == 1) {
|
|
/* Initial call state */
|
|
ssize_t hlen;
|
|
|
|
switch (check_gzip_header((unsigned char *)k->str, nread, &hlen)) {
|
|
case GZIP_OK:
|
|
z->next_in = (Bytef *)k->str + hlen;
|
|
z->avail_in = nread - hlen;
|
|
k->zlib_init = 3; /* Inflating stream state */
|
|
break;
|
|
|
|
case GZIP_UNDERFLOW:
|
|
/* We need more data so we can find the end of the gzip header.
|
|
It's possible that the memory block we malloc here will never be
|
|
freed if the transfer abruptly aborts after this point. Since it's
|
|
unlikely that circumstances will be right for this code path to be
|
|
followed in the first place, and it's even more unlikely for a transfer
|
|
to fail immediately afterwards, it should seldom be a problem. */
|
|
z->avail_in = nread;
|
|
z->next_in = malloc(z->avail_in);
|
|
if (z->next_in == NULL) {
|
|
return exit_zlib(z, &k->zlib_init, CURLE_OUT_OF_MEMORY);
|
|
}
|
|
memcpy(z->next_in, k->str, z->avail_in);
|
|
k->zlib_init = 2; /* Need more gzip header data state */
|
|
/* We don't have any data to inflate yet */
|
|
return CURLE_OK;
|
|
|
|
case GZIP_BAD:
|
|
default:
|
|
return exit_zlib(z, &k->zlib_init, process_zlib_error(data, z));
|
|
}
|
|
|
|
}
|
|
else if (k->zlib_init == 2) {
|
|
/* Need more gzip header data state */
|
|
ssize_t hlen;
|
|
unsigned char *oldblock = z->next_in;
|
|
|
|
z->avail_in += nread;
|
|
z->next_in = realloc(z->next_in, z->avail_in);
|
|
if (z->next_in == NULL) {
|
|
free(oldblock);
|
|
return exit_zlib(z, &k->zlib_init, CURLE_OUT_OF_MEMORY);
|
|
}
|
|
/* Append the new block of data to the previous one */
|
|
memcpy(z->next_in + z->avail_in - nread, k->str, nread);
|
|
|
|
switch (check_gzip_header(z->next_in, z->avail_in, &hlen)) {
|
|
case GZIP_OK:
|
|
/* This is the zlib stream data */
|
|
free(z->next_in);
|
|
/* Don't point into the malloced block since we just freed it */
|
|
z->next_in = (Bytef *)k->str + hlen + nread - z->avail_in;
|
|
z->avail_in = z->avail_in - hlen;
|
|
k->zlib_init = 3; /* Inflating stream state */
|
|
break;
|
|
|
|
case GZIP_UNDERFLOW:
|
|
/* We still don't have any data to inflate! */
|
|
return CURLE_OK;
|
|
|
|
case GZIP_BAD:
|
|
default:
|
|
free(z->next_in);
|
|
return exit_zlib(z, &k->zlib_init, process_zlib_error(data, z));
|
|
}
|
|
|
|
}
|
|
else {
|
|
/* Inflating stream state */
|
|
z->next_in = (Bytef *)k->str;
|
|
z->avail_in = nread;
|
|
}
|
|
|
|
if (z->avail_in == 0) {
|
|
/* We don't have any data to inflate; wait until next time */
|
|
return CURLE_OK;
|
|
}
|
|
|
|
/* because the buffer size is fixed, iteratively decompress
|
|
and transfer to the client via client_write. */
|
|
for (;;) {
|
|
/* (re)set buffer for decompressed output for every iteration */
|
|
z->next_out = (Bytef *)&decomp[0];
|
|
z->avail_out = DSIZ;
|
|
|
|
status = inflate(z, Z_SYNC_FLUSH);
|
|
if (status == Z_OK || status == Z_STREAM_END) {
|
|
if(DSIZ - z->avail_out) {
|
|
result = Curl_client_write(data, CLIENTWRITE_BODY, decomp,
|
|
DSIZ - z->avail_out);
|
|
/* if !CURLE_OK, clean up, return */
|
|
if (result)
|
|
return exit_zlib(z, &k->zlib_init, result);
|
|
}
|
|
|
|
/* Done?; clean up, return */
|
|
/* We should really check the gzip CRC here */
|
|
if (status == Z_STREAM_END) {
|
|
if (inflateEnd(z) == Z_OK)
|
|
return exit_zlib(z, &k->zlib_init, result);
|
|
else
|
|
return exit_zlib(z, &k->zlib_init, process_zlib_error(data, z));
|
|
}
|
|
|
|
/* Done with these bytes, exit */
|
|
if (status == Z_OK && z->avail_in == 0 && z->avail_out > 0)
|
|
return result;
|
|
}
|
|
else { /* Error; exit loop, handle below */
|
|
return exit_zlib(z, &k->zlib_init, process_zlib_error(data, z));
|
|
}
|
|
}
|
|
}
|
|
#endif /* HAVE_LIBZ */
|