116 lines
2.7 KiB
C++
116 lines
2.7 KiB
C++
#include "GZip.h"
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#include <zlib.h>
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#include <QByteArray>
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bool GZip::unzip(const QByteArray &compressedBytes, QByteArray &uncompressedBytes)
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{
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if (compressedBytes.size() == 0)
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{
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uncompressedBytes = compressedBytes;
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return true;
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}
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unsigned uncompLength = compressedBytes.size();
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uncompressedBytes.clear();
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uncompressedBytes.resize(uncompLength);
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z_stream strm;
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memset(&strm, 0, sizeof(strm));
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strm.next_in = (Bytef *)compressedBytes.data();
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strm.avail_in = compressedBytes.size();
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bool done = false;
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if (inflateInit2(&strm, (16 + MAX_WBITS)) != Z_OK)
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{
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return false;
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}
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int err = Z_OK;
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while (!done)
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{
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// If our output buffer is too small
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if (strm.total_out >= uncompLength)
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{
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uncompressedBytes.resize(uncompLength * 2);
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uncompLength *= 2;
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}
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strm.next_out = (Bytef *)(uncompressedBytes.data() + strm.total_out);
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strm.avail_out = uncompLength - strm.total_out;
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// Inflate another chunk.
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err = inflate(&strm, Z_SYNC_FLUSH);
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if (err == Z_STREAM_END)
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done = true;
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else if (err != Z_OK)
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{
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break;
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}
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}
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if (inflateEnd(&strm) != Z_OK || !done)
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{
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return false;
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}
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uncompressedBytes.resize(strm.total_out);
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return true;
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}
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bool GZip::zip(const QByteArray &uncompressedBytes, QByteArray &compressedBytes)
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{
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if (uncompressedBytes.size() == 0)
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{
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compressedBytes = uncompressedBytes;
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return true;
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}
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unsigned compLength = qMin(uncompressedBytes.size(), 16);
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compressedBytes.clear();
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compressedBytes.resize(compLength);
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z_stream zs;
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memset(&zs, 0, sizeof(zs));
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if (deflateInit2(&zs, Z_DEFAULT_COMPRESSION, Z_DEFLATED, (16 + MAX_WBITS), 8, Z_DEFAULT_STRATEGY) != Z_OK)
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{
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return false;
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}
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zs.next_in = (Bytef*)uncompressedBytes.data();
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zs.avail_in = uncompressedBytes.size();
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int ret;
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compressedBytes.resize(uncompressedBytes.size());
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unsigned offset = 0;
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unsigned temp = 0;
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do
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{
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auto remaining = compressedBytes.size() - offset;
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if(remaining < 1)
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{
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compressedBytes.resize(compressedBytes.size() * 2);
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}
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zs.next_out = (Bytef *) (compressedBytes.data() + offset);
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temp = zs.avail_out = compressedBytes.size() - offset;
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ret = deflate(&zs, Z_FINISH);
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offset += temp - zs.avail_out;
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} while (ret == Z_OK);
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compressedBytes.resize(offset);
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if (deflateEnd(&zs) != Z_OK)
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{
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return false;
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}
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if (ret != Z_STREAM_END)
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{
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return false;
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}
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return true;
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}
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