70 lines
1.3 KiB
C++
70 lines
1.3 KiB
C++
#include <zlib.h>
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#include <stdint.h>
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#include "ZlibDecompressor.h"
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ZlibDecompressor::ZlibDecompressor(const u8 *data, size_t size):
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m_data(data),
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m_seekPos(0),
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m_size(size)
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{
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}
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ZlibDecompressor::~ZlibDecompressor()
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{
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}
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void ZlibDecompressor::setSeekPos(size_t seekPos)
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{
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m_seekPos = seekPos;
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}
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size_t ZlibDecompressor::seekPos() const
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{
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return m_seekPos;
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}
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ustring ZlibDecompressor::decompress()
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{
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const unsigned char *data = m_data + m_seekPos;
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const size_t size = m_size - m_seekPos;
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ustring buffer;
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constexpr size_t BUFSIZE = 32 * 1024;
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z_stream strm;
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strm.zalloc = Z_NULL;
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strm.zfree = Z_NULL;
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strm.opaque = Z_NULL;
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strm.next_in = Z_NULL;
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strm.avail_in = 0;
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if (inflateInit(&strm) != Z_OK)
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throw DecompressError();
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strm.next_in = const_cast<unsigned char *>(data);
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strm.avail_in = size;
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buffer.resize(BUFSIZE);
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strm.next_out = &buffer[0];
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strm.avail_out = BUFSIZE;
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int ret = 0;
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do {
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ret = inflate(&strm, Z_NO_FLUSH);
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if (strm.avail_out == 0) {
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const auto off = buffer.size();
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buffer.reserve(off + BUFSIZE);
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strm.next_out = &buffer[off];
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strm.avail_out = BUFSIZE;
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}
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} while (ret == Z_OK);
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if (ret != Z_STREAM_END)
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throw DecompressError();
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m_seekPos += strm.next_in - data;
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buffer.resize(buffer.size() - strm.avail_out);
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(void) inflateEnd(&strm);
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return buffer;
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}
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