72 lines
1.5 KiB
C++
72 lines
1.5 KiB
C++
/*
|
|
* =====================================================================
|
|
* Version: 1.0
|
|
* Created: 18.09.2012 10:20:47
|
|
* Author: Miroslav Bendík
|
|
* Company: LinuxOS.sk
|
|
* =====================================================================
|
|
*/
|
|
|
|
#include <zlib.h>
|
|
#include <stdint.h>
|
|
#include "ZlibDecompressor.h"
|
|
|
|
ZlibDecompressor::ZlibDecompressor(const unsigned char *data, std::size_t size):
|
|
m_data(data),
|
|
m_seekPos(0),
|
|
m_size(size)
|
|
{
|
|
}
|
|
|
|
ZlibDecompressor::~ZlibDecompressor()
|
|
{
|
|
}
|
|
|
|
void ZlibDecompressor::setSeekPos(std::size_t seekPos)
|
|
{
|
|
m_seekPos = seekPos;
|
|
}
|
|
|
|
std::size_t ZlibDecompressor::seekPos() const
|
|
{
|
|
return m_seekPos;
|
|
}
|
|
|
|
ZlibDecompressor::string ZlibDecompressor::decompress()
|
|
{
|
|
const unsigned char *data = m_data + m_seekPos;
|
|
const std::size_t size = m_size - m_seekPos;
|
|
|
|
string buffer;
|
|
const size_t BUFSIZE = 128 * 1024;
|
|
uint8_t temp_buffer[BUFSIZE];
|
|
|
|
z_stream strm;
|
|
strm.zalloc = Z_NULL;
|
|
strm.zfree = Z_NULL;
|
|
strm.opaque = Z_NULL;
|
|
strm.next_in = Z_NULL;
|
|
strm.avail_in = size;
|
|
|
|
if (inflateInit(&strm) != Z_OK) {
|
|
throw DecompressError();
|
|
}
|
|
|
|
strm.next_in = const_cast<unsigned char *>(data);
|
|
int ret = 0;
|
|
do {
|
|
strm.avail_out = BUFSIZE;
|
|
strm.next_out = temp_buffer;
|
|
ret = inflate(&strm, Z_NO_FLUSH);
|
|
buffer += string(reinterpret_cast<unsigned char *>(temp_buffer), BUFSIZE - strm.avail_out);
|
|
} while (ret == Z_OK);
|
|
if (ret != Z_STREAM_END) {
|
|
throw DecompressError();
|
|
}
|
|
m_seekPos += strm.next_in - data;
|
|
(void)inflateEnd(&strm);
|
|
|
|
return buffer;
|
|
}
|
|
|