mirror of
https://github.com/minetest/minetest.git
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382 lines
8.4 KiB
C++
382 lines
8.4 KiB
C++
/*
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Minetest
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Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "serialization.h"
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#include "log.h"
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#include "util/serialize.h"
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#include <zlib.h>
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#include <zstd.h>
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/* report a zlib or i/o error */
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static void zerr(int ret)
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{
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dstream<<"zerr: ";
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switch (ret) {
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case Z_ERRNO:
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if (ferror(stdin))
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dstream<<"error reading stdin"<<std::endl;
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if (ferror(stdout))
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dstream<<"error writing stdout"<<std::endl;
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break;
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case Z_STREAM_ERROR:
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dstream<<"invalid compression level"<<std::endl;
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break;
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case Z_DATA_ERROR:
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dstream<<"invalid or incomplete deflate data"<<std::endl;
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break;
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case Z_MEM_ERROR:
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dstream<<"out of memory"<<std::endl;
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break;
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case Z_VERSION_ERROR:
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dstream<<"zlib version mismatch!"<<std::endl;
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break;
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default:
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dstream<<"return value = "<<ret<<std::endl;
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}
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}
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// Make sure that z is deleted in case of exception
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template <int (*F)(z_stream*)>
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class ZlibAutoDeleter {
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public:
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ZlibAutoDeleter(z_stream *ptr) : ptr_(ptr) {}
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~ZlibAutoDeleter() { F(ptr_); }
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private:
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z_stream *ptr_;
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};
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void compressZlib(const u8 *data, size_t data_size, std::ostream &os, int level)
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{
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z_stream z;
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const s32 bufsize = 16384;
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char output_buffer[bufsize];
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int status = 0;
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int ret;
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z.zalloc = Z_NULL;
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z.zfree = Z_NULL;
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z.opaque = Z_NULL;
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ret = deflateInit(&z, level);
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if(ret != Z_OK)
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throw SerializationError("compressZlib: deflateInit failed");
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ZlibAutoDeleter<deflateEnd> deleter(&z);
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// Point zlib to our input buffer
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z.next_in = (Bytef*)&data[0];
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z.avail_in = data_size;
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// And get all output
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for(;;)
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{
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z.next_out = (Bytef*)output_buffer;
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z.avail_out = bufsize;
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status = deflate(&z, Z_FINISH);
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if(status == Z_NEED_DICT || status == Z_DATA_ERROR
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|| status == Z_MEM_ERROR)
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{
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zerr(status);
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throw SerializationError("compressZlib: deflate failed");
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}
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int count = bufsize - z.avail_out;
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if(count)
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os.write(output_buffer, count);
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// This determines zlib has given all output
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if(status == Z_STREAM_END)
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break;
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}
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}
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void decompressZlib(std::istream &is, std::ostream &os, size_t limit)
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{
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z_stream z;
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const s32 bufsize = 16384;
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char input_buffer[bufsize];
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char output_buffer[bufsize];
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int status = 0;
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int ret;
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int bytes_written = 0;
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int input_buffer_len = 0;
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z.zalloc = Z_NULL;
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z.zfree = Z_NULL;
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z.opaque = Z_NULL;
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ret = inflateInit(&z);
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if(ret != Z_OK)
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throw SerializationError("dcompressZlib: inflateInit failed");
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ZlibAutoDeleter<inflateEnd> deleter(&z);
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z.avail_in = 0;
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for(;;)
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{
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int output_size = bufsize;
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z.next_out = (Bytef*)output_buffer;
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z.avail_out = output_size;
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if (limit) {
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int limit_remaining = limit - bytes_written;
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if (limit_remaining <= 0) {
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// we're aborting ahead of time - throw an error?
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break;
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}
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if (limit_remaining < output_size) {
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z.avail_out = output_size = limit_remaining;
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}
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}
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if(z.avail_in == 0)
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{
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z.next_in = (Bytef*)input_buffer;
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is.read(input_buffer, bufsize);
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input_buffer_len = is.gcount();
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z.avail_in = input_buffer_len;
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}
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if(z.avail_in == 0)
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{
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break;
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}
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status = inflate(&z, Z_NO_FLUSH);
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if(status == Z_NEED_DICT || status == Z_DATA_ERROR
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|| status == Z_MEM_ERROR)
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{
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zerr(status);
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throw SerializationError("decompressZlib: inflate failed");
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}
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int count = output_size - z.avail_out;
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if(count)
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os.write(output_buffer, count);
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bytes_written += count;
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if(status == Z_STREAM_END)
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{
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// Unget all the data that inflate didn't take
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is.clear(); // Just in case EOF is set
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for(u32 i=0; i < z.avail_in; i++)
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{
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is.unget();
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if(is.fail() || is.bad())
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{
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dstream<<"unget #"<<i<<" failed"<<std::endl;
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dstream<<"fail="<<is.fail()<<" bad="<<is.bad()<<std::endl;
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throw SerializationError("decompressZlib: unget failed");
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}
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}
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break;
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}
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}
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}
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struct ZSTD_Deleter {
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void operator() (ZSTD_CStream* cstream) {
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ZSTD_freeCStream(cstream);
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}
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void operator() (ZSTD_DStream* dstream) {
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ZSTD_freeDStream(dstream);
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}
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};
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void compressZstd(const u8 *data, size_t data_size, std::ostream &os, int level)
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{
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// reusing the context is recommended for performance
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// it will be destroyed when the thread ends
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thread_local std::unique_ptr<ZSTD_CStream, ZSTD_Deleter> stream(ZSTD_createCStream());
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ZSTD_initCStream(stream.get(), level);
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const size_t bufsize = 16384;
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char output_buffer[bufsize];
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ZSTD_inBuffer input = { data, data_size, 0 };
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ZSTD_outBuffer output = { output_buffer, bufsize, 0 };
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while (input.pos < input.size) {
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size_t ret = ZSTD_compressStream(stream.get(), &output, &input);
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if (ZSTD_isError(ret)) {
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dstream << ZSTD_getErrorName(ret) << std::endl;
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throw SerializationError("compressZstd: failed");
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}
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if (output.pos) {
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os.write(output_buffer, output.pos);
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output.pos = 0;
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}
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}
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size_t ret;
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do {
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ret = ZSTD_endStream(stream.get(), &output);
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if (ZSTD_isError(ret)) {
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dstream << ZSTD_getErrorName(ret) << std::endl;
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throw SerializationError("compressZstd: failed");
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}
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if (output.pos) {
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os.write(output_buffer, output.pos);
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output.pos = 0;
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}
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} while (ret != 0);
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}
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void decompressZstd(std::istream &is, std::ostream &os)
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{
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// reusing the context is recommended for performance
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// it will be destroyed when the thread ends
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thread_local std::unique_ptr<ZSTD_DStream, ZSTD_Deleter> stream(ZSTD_createDStream());
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ZSTD_initDStream(stream.get());
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const size_t bufsize = 16384;
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char output_buffer[bufsize];
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char input_buffer[bufsize];
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ZSTD_outBuffer output = { output_buffer, bufsize, 0 };
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ZSTD_inBuffer input = { input_buffer, 0, 0 };
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size_t ret;
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do
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{
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if (input.size == input.pos) {
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is.read(input_buffer, bufsize);
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input.size = is.gcount();
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input.pos = 0;
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}
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ret = ZSTD_decompressStream(stream.get(), &output, &input);
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if (ZSTD_isError(ret)) {
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dstream << ZSTD_getErrorName(ret) << std::endl;
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throw SerializationError("decompressZstd: failed");
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}
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if (output.pos) {
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os.write(output_buffer, output.pos);
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output.pos = 0;
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}
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} while (ret != 0);
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// Unget all the data that ZSTD_decompressStream didn't take
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is.clear(); // Just in case EOF is set
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for (u32 i = 0; i < input.size - input.pos; i++) {
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is.unget();
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if (is.fail() || is.bad())
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throw SerializationError("decompressZstd: unget failed");
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}
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}
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void compress(const u8 *data, u32 size, std::ostream &os, u8 version, int level)
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{
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if(version >= 29)
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{
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// map the zlib levels [0,9] to [1,10]. -1 becomes 0 which indicates the default (currently 3)
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compressZstd(data, size, os, level + 1);
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return;
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}
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if(version >= 11)
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{
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compressZlib(data, size, os, level);
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return;
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}
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if(size == 0)
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return;
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// Write length (u32)
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u8 tmp[4];
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writeU32(tmp, size);
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os.write((char*)tmp, 4);
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// We will be writing 8-bit pairs of more_count and byte
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u8 more_count = 0;
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u8 current_byte = data[0];
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for(u32 i=1; i<size; i++)
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{
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if(
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data[i] != current_byte
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|| more_count == 255
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)
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{
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// write count and byte
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os.write((char*)&more_count, 1);
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os.write((char*)¤t_byte, 1);
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more_count = 0;
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current_byte = data[i];
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}
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else
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{
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more_count++;
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}
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}
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// write count and byte
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os.write((char*)&more_count, 1);
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os.write((char*)¤t_byte, 1);
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}
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void decompress(std::istream &is, std::ostream &os, u8 version)
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{
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if(version >= 29)
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{
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decompressZstd(is, os);
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return;
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}
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if(version >= 11)
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{
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decompressZlib(is, os);
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return;
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}
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// Read length (u32)
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u8 tmp[4];
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is.read((char*)tmp, 4);
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u32 len = readU32(tmp);
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// We will be reading 8-bit pairs of more_count and byte
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u32 count = 0;
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for(;;)
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{
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u8 more_count=0;
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u8 byte=0;
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is.read((char*)&more_count, 1);
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is.read((char*)&byte, 1);
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if(is.eof())
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throw SerializationError("decompress: stream ended halfway");
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for(s32 i=0; i<(u16)more_count+1; i++)
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os.write((char*)&byte, 1);
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count += (u16)more_count+1;
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if(count == len)
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break;
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}
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}
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