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/* This file is part of Strigi Desktop Search
*
* Copyright (C) 2006 Ben van Klinken <bvklinken@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "gzipcompressstream.h"
#include <zlib.h>
#include <iostream>
using namespace Strigi;
using namespace std;
GZipCompressInputStream::GZipCompressInputStream(InputStream* input, int level) {
// initialize values that signal state
m_status = Ok;
zstream = 0;
if ( level < 0 || level > 9 ) {
level = Z_DEFAULT_COMPRESSION;
}
this->input = input;
// initialize the z_stream
zstream = (z_stream_s*)malloc(sizeof(z_stream_s));
zstream->zalloc = Z_NULL;
zstream->zfree = Z_NULL;
zstream->opaque = Z_NULL;
zstream->avail_in = 0;
// initialize for writing gzip streams
int r = deflateInit(zstream, level);
if (r != Z_OK) {
m_error = "Error initializing GZipCompressInputStream.";
dealloc();
m_status = Error;
return;
}
// signal that we need to read into the buffer
zstream->avail_out = 1;
}
GZipCompressInputStream::~GZipCompressInputStream() {
dealloc();
}
void
GZipCompressInputStream::dealloc() {
if (zstream) {
deflateEnd(zstream);
free(zstream);
zstream = 0;
}
}
void
GZipCompressInputStream::readFromStream() {
// read data from the input stream
const char* inStart;
int32_t nread;
nread = input->read(inStart, 1, 0);
if (nread < -1) {
m_status = Error;
m_error = input->error();
} else if (nread < 1) {
zstream->avail_in = 0; //bail...
} else {
zstream->next_in = (Bytef*)inStart;
zstream->avail_in = nread;
}
}
int32_t
GZipCompressInputStream::fillBuffer(char* start, int32_t space) {
cerr << "GZCI " << this << " " << zstream << endl;
if (zstream == 0) return -1;
// make sure we can write into the buffer
zstream->avail_out = space;
zstream->next_out = (Bytef*)start;
int r;
// make sure there is data to decompress
if (zstream->avail_in == 0) {
readFromStream();
if (m_status == Error) {
cerr << "error " << endl;
// no data was read
return -1;
} else if (zstream->avail_in == 0) {
r = deflate(zstream, Z_FINISH);
int32_t nwritten = space - zstream->avail_out;
cerr << "GZCI end " << this << " " << nwritten << " " << m_status
<< endl;
if (r != Z_OK) {
cerr << "GZCI streamend " << r << endl;
dealloc();
if (r != Z_STREAM_END) {
fprintf(stderr, "deflate should report Z_STREAM_END\n");
return -1;
}
}
return nwritten;
}
}
r = deflate(zstream, Z_NO_FLUSH);
// inform the buffer of the number of bytes that was read
int32_t nwritten = space - zstream->avail_out;
switch (r) {
case Z_NEED_DICT:
m_error = "Z_NEED_DICT while inflating stream.";
m_status = Error;
break;
case Z_DATA_ERROR:
m_error = "Z_DATA_ERROR while inflating stream.";
m_status = Error;
break;
case Z_MEM_ERROR:
m_error = "Z_MEM_ERROR while inflating stream.";
m_status = Error;
break;
}
cerr << "GZCI more " << this << " " << nwritten << endl;
return nwritten;
}
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