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ff8148dd92
Also move colorutil.cpp/h linking build fix experiment Delete a bunch of unused CMakeLists.txt files CMakeLists.txt linking fix Don't include NativeApp.h from any headers. Android.mk buildfix Half of the UWP fix Buildfix Minor project file cleanup Buildfixes Guess what? More buildfixes!
105 lines
2.6 KiB
C++
105 lines
2.6 KiB
C++
// Little utility functions for data compression.
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// Taken from http://panthema.net/2007/0328-ZLibString.html
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#include <string>
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#include <stdexcept>
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#include <iostream>
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#include <iomanip>
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#include <sstream>
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#include <cstring>
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#include <zlib.h>
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#include "Common/Log.h"
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/** Compress a STL string using zlib with given compression level and return
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* the binary data. */
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bool compress_string(const std::string& str, std::string *dest, int compressionlevel) {
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z_stream zs; // z_stream is zlib's control structure
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memset(&zs, 0, sizeof(zs));
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if (deflateInit(&zs, compressionlevel) != Z_OK) {
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ERROR_LOG(IO, "deflateInit failed while compressing.");
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return false;
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}
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zs.next_in = (Bytef*)str.data();
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zs.avail_in = (uInt)str.size(); // set the z_stream's input
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int ret;
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char outbuffer[32768];
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std::string outstring;
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// retrieve the compressed bytes blockwise
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do {
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zs.next_out = reinterpret_cast<Bytef*>(outbuffer);
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zs.avail_out = sizeof(outbuffer);
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ret = deflate(&zs, Z_FINISH);
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if (outstring.size() < zs.total_out) {
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// append the block to the output string
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outstring.append(outbuffer,
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zs.total_out - outstring.size());
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}
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} while (ret == Z_OK);
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deflateEnd(&zs);
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if (ret != Z_STREAM_END) { // an error occurred that was not EOF
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std::ostringstream oss;
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oss << "Exception during zlib compression: (" << ret << ") " << zs.msg;
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return false;
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}
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*dest = outstring;
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return true;
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}
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/** Decompress an STL string using zlib and return the original data. */
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bool decompress_string(const std::string& str, std::string *dest) {
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if (!str.size())
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return false;
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z_stream zs; // z_stream is zlib's control structure
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memset(&zs, 0, sizeof(zs));
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// modification by hrydgard: inflateInit2, 16+MAXWBITS makes it read gzip data too
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if (inflateInit2(&zs, 32+MAX_WBITS) != Z_OK) {
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ERROR_LOG(IO, "inflateInit failed while decompressing.");
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return false;
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}
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zs.next_in = (Bytef*)str.data();
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zs.avail_in = (uInt)str.size();
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int ret;
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char outbuffer[32768];
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std::string outstring;
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// get the decompressed bytes blockwise using repeated calls to inflate
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do {
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zs.next_out = reinterpret_cast<Bytef*>(outbuffer);
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zs.avail_out = sizeof(outbuffer);
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ret = inflate(&zs, 0);
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if (outstring.size() < zs.total_out) {
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outstring.append(outbuffer,
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zs.total_out - outstring.size());
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}
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} while (ret == Z_OK);
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inflateEnd(&zs);
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if (ret != Z_STREAM_END) { // an error occurred that was not EOF
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std::ostringstream oss;
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ERROR_LOG(IO, "Exception during zlib decompression: (%i) %s", ret, zs.msg);
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return false;
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}
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*dest = outstring;
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return true;
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}
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