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/***************************************************************************
* _ _ ____ _
* 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.
*
* $Id$
***************************************************************************/
#include "setup.h"
#ifdef HAVE_LIBZ
#include "urldata.h"
#include <curl/curl.h>
#include <curl/types.h>
#include "sendf.h"
#define DSIZ 4096 /* buffer size for decompressed data */
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 fucntion 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) {
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));
}
}
}
#endif /* HAVE_LIBZ */
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