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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 <Swiften/Compress/ZLibException.h>
namespace Swift {
static const int CHUNK_SIZE = 1024; // If you change this, also change the unittest
ZLibCodecompressor::ZLibCodecompressor() {
memset(&stream_, 0, sizeof(z_stream));
stream_.zalloc = Z_NULL;
stream_.zfree = Z_NULL;
stream_.opaque = Z_NULL;
}
ZLibCodecompressor::~ZLibCodecompressor() {
}
ByteArray ZLibCodecompressor::process(const ByteArray& input) {
ByteArray output;
stream_.avail_in = input.getSize();
stream_.next_in = reinterpret_cast<Bytef*>(const_cast<unsigned char*>(input.getData()));
int outputPosition = 0;
do {
output.resize(outputPosition + CHUNK_SIZE);
stream_.avail_out = CHUNK_SIZE;
stream_.next_out = reinterpret_cast<Bytef*>(output.getData() + outputPosition);
int result = processZStream();
if (result != Z_OK && result != Z_BUF_ERROR) {
throw ZLibException(/* stream_.msg */);
}
outputPosition += CHUNK_SIZE;
}
while (stream_.avail_out == 0);
if (stream_.avail_in != 0) {
throw ZLibException();
}
output.resize(outputPosition - stream_.avail_out);
return output;
}
}
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Swift