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/*
* Copyright (c) 2010 Remko Tronçon
* Licensed under the GNU General Public License v3.
* See Documentation/Licenses/GPLv3.txt for more information.
*/
#include <Swiften/Compress/ZLibCodecompressor.h>
#include <cassert>
#include <string.h>
#include <zlib.h>
#include <Swiften/Compress/ZLibException.h>
#include <Swiften/Compress/ZLibCodecompressor_Private.h>
namespace Swift {
static const int CHUNK_SIZE = 1024; // If you change this, also change the unittest
ZLibCodecompressor::ZLibCodecompressor() : p(boost::make_shared<Private>()) {
memset(&p->stream, 0, sizeof(z_stream));
p->stream.zalloc = Z_NULL;
p->stream.zfree = Z_NULL;
p->stream.opaque = Z_NULL;
}
ZLibCodecompressor::~ZLibCodecompressor() {
}
SafeByteArray ZLibCodecompressor::process(const SafeByteArray& input) {
SafeByteArray output;
p->stream.avail_in = input.size();
p->stream.next_in = reinterpret_cast<Bytef*>(const_cast<unsigned char*>(vecptr(input)));
int outputPosition = 0;
do {
output.resize(outputPosition + CHUNK_SIZE);
p->stream.avail_out = CHUNK_SIZE;
p->stream.next_out = reinterpret_cast<Bytef*>(vecptr(output) + outputPosition);
int result = processZStream();
if (result != Z_OK && result != Z_BUF_ERROR) {
throw ZLibException(/* p->stream.msg */);
}
outputPosition += CHUNK_SIZE;
}
while (p->stream.avail_out == 0);
if (p->stream.avail_in != 0) {
throw ZLibException();
}
output.resize(outputPosition - p->stream.avail_out);
return output;
}
}
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