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7b18f64309
git-svn-id: https://unknownworlds.svn.cloudforge.com/ns1@16 67975925-1194-0748-b3d5-c16f83f1a3a1
354 lines
10 KiB
C
354 lines
10 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2003, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* $Id: content_encoding.c,v 1.7 2003/04/22 22:32:02 bagder Exp $
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***************************************************************************/
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#include "setup.h"
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#ifdef HAVE_LIBZ
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#include <stdlib.h>
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#include <string.h>
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#include "urldata.h"
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#include <curl/curl.h>
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#include <curl/types.h>
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#include "sendf.h"
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#define DSIZ 0x10000 /* buffer size for decompressed data */
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#define GZIP_MAGIC_0 0x1f
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#define GZIP_MAGIC_1 0x8b
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/* gzip flag byte */
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#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
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#define HEAD_CRC 0x02 /* bit 1 set: header CRC present */
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#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
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#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
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#define COMMENT 0x10 /* bit 4 set: file comment present */
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#define RESERVED 0xE0 /* bits 5..7: reserved */
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static CURLcode
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process_zlib_error(struct SessionHandle *data, z_stream *z)
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{
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if (z->msg)
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failf (data, "Error while processing content unencoding.\n%s",
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z->msg);
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else
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failf (data, "Error while processing content unencoding.\n"
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"Unknown failure within decompression software.");
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return CURLE_BAD_CONTENT_ENCODING;
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}
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static CURLcode
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exit_zlib(z_stream *z, bool *zlib_init, CURLcode result)
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{
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inflateEnd(z);
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*zlib_init = 0;
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return result;
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}
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CURLcode
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Curl_unencode_deflate_write(struct SessionHandle *data,
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struct Curl_transfer_keeper *k,
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ssize_t nread)
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{
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int status; /* zlib status */
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int result; /* Curl_client_write status */
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char decomp[DSIZ]; /* Put the decompressed data here. */
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z_stream *z = &k->z; /* zlib state structure */
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/* Initialize zlib? */
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if (!k->zlib_init) {
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z->zalloc = (alloc_func)Z_NULL;
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z->zfree = (free_func)Z_NULL;
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z->opaque = 0; /* of dubious use 08/27/02 jhrg */
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if (inflateInit(z) != Z_OK)
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return process_zlib_error(data, z);
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k->zlib_init = 1;
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}
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/* Set the compressed input when this function is called */
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z->next_in = (Bytef *)k->str;
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z->avail_in = nread;
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/* because the buffer size is fixed, iteratively decompress
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and transfer to the client via client_write. */
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for (;;) {
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/* (re)set buffer for decompressed output for every iteration */
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z->next_out = (Bytef *)&decomp[0];
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z->avail_out = DSIZ;
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status = inflate(z, Z_SYNC_FLUSH);
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if (status == Z_OK || status == Z_STREAM_END) {
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if (DSIZ - z->avail_out) {
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result = Curl_client_write(data, CLIENTWRITE_BODY, decomp,
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DSIZ - z->avail_out);
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/* if !CURLE_OK, clean up, return */
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if (result)
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return exit_zlib(z, &k->zlib_init, result);
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}
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/* Done?; clean up, return */
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if (status == Z_STREAM_END) {
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if (inflateEnd(z) == Z_OK)
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return exit_zlib(z, &k->zlib_init, result);
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else
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return exit_zlib(z, &k->zlib_init, process_zlib_error(data, z));
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}
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/* Done with these bytes, exit */
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if (status == Z_OK && z->avail_in == 0 && z->avail_out > 0)
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return result;
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}
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else { /* Error; exit loop, handle below */
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return exit_zlib(z, &k->zlib_init, process_zlib_error(data, z));
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}
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}
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}
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/* Skip over the gzip header */
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static enum {
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GZIP_OK,
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GZIP_BAD,
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GZIP_UNDERFLOW
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} check_gzip_header(unsigned char const *data, ssize_t len, ssize_t *headerlen)
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{
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int method, flags;
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const ssize_t totallen = len;
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/* The shortest header is 10 bytes */
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if (len < 10)
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return GZIP_UNDERFLOW;
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if ((data[0] != GZIP_MAGIC_0) || (data[1] != GZIP_MAGIC_1))
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return GZIP_BAD;
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method = data[2];
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flags = data[3];
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if (method != Z_DEFLATED || (flags & RESERVED) != 0) {
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/* Can't handle this compression method or unknown flag */
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return GZIP_BAD;
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}
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/* Skip over time, xflags, OS code and all previous bytes */
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len -= 10;
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data += 10;
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if (flags & EXTRA_FIELD) {
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ssize_t extra_len;
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if (len < 2)
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return GZIP_UNDERFLOW;
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extra_len = (data[1] << 8) | data[0];
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if (len < (extra_len+2))
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return GZIP_UNDERFLOW;
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len -= (extra_len + 2);
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}
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if (flags & ORIG_NAME) {
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/* Skip over NUL-terminated file name */
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while (len && *data) {
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--len;
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++data;
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}
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if (!len || *data)
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return GZIP_UNDERFLOW;
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/* Skip over the NUL */
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--len;
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++data;
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}
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if (flags & COMMENT) {
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/* Skip over NUL-terminated comment */
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while (len && *data) {
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--len;
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++data;
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}
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if (!len || *data)
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return GZIP_UNDERFLOW;
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/* Skip over the NUL */
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--len;
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++data;
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}
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if (flags & HEAD_CRC) {
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if (len < 2)
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return GZIP_UNDERFLOW;
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len -= 2;
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data += 2;
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}
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*headerlen = totallen - len;
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return GZIP_OK;
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}
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CURLcode
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Curl_unencode_gzip_write(struct SessionHandle *data,
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struct Curl_transfer_keeper *k,
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ssize_t nread)
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{
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int status; /* zlib status */
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int result; /* Curl_client_write status */
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char decomp[DSIZ]; /* Put the decompressed data here. */
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z_stream *z = &k->z; /* zlib state structure */
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/* Initialize zlib? */
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if (!k->zlib_init) {
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z->zalloc = (alloc_func)Z_NULL;
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z->zfree = (free_func)Z_NULL;
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z->opaque = 0; /* of dubious use 08/27/02 jhrg */
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if (inflateInit2(z, -MAX_WBITS) != Z_OK)
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return process_zlib_error(data, z);
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k->zlib_init = 1; /* Initial call state */
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}
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/* This next mess is to get around the potential case where there isn't
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enough data passed in to skip over the gzip header. If that happens,
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we malloc a block and copy what we have then wait for the next call. If
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there still isn't enough (this is definitely a worst-case scenario), we
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make the block bigger, copy the next part in and keep waiting. */
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/* Skip over gzip header? */
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if (k->zlib_init == 1) {
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/* Initial call state */
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ssize_t hlen;
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switch (check_gzip_header((unsigned char *)k->str, nread, &hlen)) {
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case GZIP_OK:
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z->next_in = (Bytef *)k->str + hlen;
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z->avail_in = nread - hlen;
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k->zlib_init = 3; /* Inflating stream state */
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break;
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case GZIP_UNDERFLOW:
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/* We need more data so we can find the end of the gzip header.
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It's possible that the memory block we malloc here will never be
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freed if the transfer abruptly aborts after this point. Since it's
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unlikely that circumstances will be right for this code path to be
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followed in the first place, and it's even more unlikely for a transfer
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to fail immediately afterwards, it should seldom be a problem. */
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z->avail_in = nread;
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z->next_in = malloc(z->avail_in);
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if (z->next_in == NULL) {
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return exit_zlib(z, &k->zlib_init, CURLE_OUT_OF_MEMORY);
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}
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memcpy(z->next_in, k->str, z->avail_in);
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k->zlib_init = 2; /* Need more gzip header data state */
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/* We don't have any data to inflate yet */
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return CURLE_OK;
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case GZIP_BAD:
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default:
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return exit_zlib(z, &k->zlib_init, process_zlib_error(data, z));
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}
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}
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else if (k->zlib_init == 2) {
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/* Need more gzip header data state */
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ssize_t hlen;
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unsigned char *oldblock = z->next_in;
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z->avail_in += nread;
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z->next_in = realloc(z->next_in, z->avail_in);
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if (z->next_in == NULL) {
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free(oldblock);
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return exit_zlib(z, &k->zlib_init, CURLE_OUT_OF_MEMORY);
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}
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/* Append the new block of data to the previous one */
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memcpy(z->next_in + z->avail_in - nread, k->str, nread);
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switch (check_gzip_header(z->next_in, z->avail_in, &hlen)) {
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case GZIP_OK:
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/* This is the zlib stream data */
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free(z->next_in);
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/* Don't point into the malloced block since we just freed it */
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z->next_in = (Bytef *)k->str + hlen + nread - z->avail_in;
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z->avail_in = z->avail_in - hlen;
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k->zlib_init = 3; /* Inflating stream state */
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break;
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case GZIP_UNDERFLOW:
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/* We still don't have any data to inflate! */
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return CURLE_OK;
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case GZIP_BAD:
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default:
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free(z->next_in);
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return exit_zlib(z, &k->zlib_init, process_zlib_error(data, z));
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}
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}
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else {
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/* Inflating stream state */
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z->next_in = (Bytef *)k->str;
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z->avail_in = nread;
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}
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if (z->avail_in == 0) {
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/* We don't have any data to inflate; wait until next time */
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return CURLE_OK;
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}
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/* because the buffer size is fixed, iteratively decompress
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and transfer to the client via client_write. */
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for (;;) {
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/* (re)set buffer for decompressed output for every iteration */
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z->next_out = (Bytef *)&decomp[0];
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z->avail_out = DSIZ;
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status = inflate(z, Z_SYNC_FLUSH);
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if (status == Z_OK || status == Z_STREAM_END) {
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if(DSIZ - z->avail_out) {
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result = Curl_client_write(data, CLIENTWRITE_BODY, decomp,
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DSIZ - z->avail_out);
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/* if !CURLE_OK, clean up, return */
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if (result)
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return exit_zlib(z, &k->zlib_init, result);
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}
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/* Done?; clean up, return */
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/* We should really check the gzip CRC here */
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if (status == Z_STREAM_END) {
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if (inflateEnd(z) == Z_OK)
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return exit_zlib(z, &k->zlib_init, result);
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else
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return exit_zlib(z, &k->zlib_init, process_zlib_error(data, z));
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}
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/* Done with these bytes, exit */
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if (status == Z_OK && z->avail_in == 0 && z->avail_out > 0)
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return result;
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}
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else { /* Error; exit loop, handle below */
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return exit_zlib(z, &k->zlib_init, process_zlib_error(data, z));
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}
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}
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}
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#endif /* HAVE_LIBZ */
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