115 lines
3.7 KiB
C
115 lines
3.7 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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* $Id$
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***************************************************************************/
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#include "setup.h"
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#ifdef HAVE_LIBZ
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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 4096 /* buffer size for decompressed data */
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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 fucntion 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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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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#endif /* HAVE_LIBZ */
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