148 lines
4.5 KiB
C++
148 lines
4.5 KiB
C++
/*************************************************************************/
|
|
/* compression.cpp */
|
|
/*************************************************************************/
|
|
/* This file is part of: */
|
|
/* GODOT ENGINE */
|
|
/* http://www.godotengine.org */
|
|
/*************************************************************************/
|
|
/* Copyright (c) 2007-2015 Juan Linietsky, Ariel Manzur. */
|
|
/* */
|
|
/* Permission is hereby granted, free of charge, to any person obtaining */
|
|
/* a copy of this software and associated documentation files (the */
|
|
/* "Software"), to deal in the Software without restriction, including */
|
|
/* without limitation the rights to use, copy, modify, merge, publish, */
|
|
/* distribute, sublicense, and/or sell copies of the Software, and to */
|
|
/* permit persons to whom the Software is furnished to do so, subject to */
|
|
/* the following conditions: */
|
|
/* */
|
|
/* The above copyright notice and this permission notice shall be */
|
|
/* included in all copies or substantial portions of the Software. */
|
|
/* */
|
|
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
|
|
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
|
|
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
|
|
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
|
|
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
|
|
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
|
|
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
|
|
/*************************************************************************/
|
|
#include "zlib.h"
|
|
#include "os/copymem.h"
|
|
#include "compression.h"
|
|
|
|
#include "fastlz.h"
|
|
#include "zip_io.h"
|
|
|
|
int Compression::compress(uint8_t *p_dst, const uint8_t *p_src, int p_src_size,Mode p_mode) {
|
|
|
|
switch(p_mode) {
|
|
case MODE_FASTLZ: {
|
|
|
|
if (p_src_size<16) {
|
|
uint8_t src[16];
|
|
zeromem(&src[p_src_size],16-p_src_size);
|
|
copymem(src,p_src,p_src_size);
|
|
return fastlz_compress(src,16,p_dst);
|
|
} else {
|
|
return fastlz_compress(p_src,p_src_size,p_dst);
|
|
}
|
|
|
|
} break;
|
|
case MODE_DEFLATE: {
|
|
|
|
z_stream strm;
|
|
strm.zalloc = zipio_alloc;
|
|
strm.zfree = zipio_free;
|
|
strm.opaque = Z_NULL;
|
|
int err = deflateInit(&strm,Z_DEFAULT_COMPRESSION);
|
|
if (err!=Z_OK)
|
|
return -1;
|
|
|
|
strm.avail_in=p_src_size;
|
|
int aout = deflateBound(&strm,p_src_size);;
|
|
strm.avail_out=aout;
|
|
strm.next_in=(Bytef*)p_src;
|
|
strm.next_out=p_dst;
|
|
deflate(&strm,Z_FINISH);
|
|
aout = aout - strm.avail_out;
|
|
deflateEnd(&strm);
|
|
return aout;
|
|
|
|
} break;
|
|
}
|
|
|
|
ERR_FAIL_V(-1);
|
|
}
|
|
|
|
int Compression::get_max_compressed_buffer_size(int p_src_size,Mode p_mode){
|
|
|
|
switch(p_mode) {
|
|
case MODE_FASTLZ: {
|
|
|
|
|
|
int ss = p_src_size+p_src_size*6/100;
|
|
if (ss<66)
|
|
ss=66;
|
|
return ss;
|
|
|
|
} break;
|
|
case MODE_DEFLATE: {
|
|
|
|
z_stream strm;
|
|
strm.zalloc = zipio_alloc;
|
|
strm.zfree = zipio_free;
|
|
strm.opaque = Z_NULL;
|
|
int err = deflateInit(&strm,Z_DEFAULT_COMPRESSION);
|
|
if (err!=Z_OK)
|
|
return -1;
|
|
int aout = deflateBound(&strm,p_src_size);
|
|
deflateEnd(&strm);
|
|
return aout;
|
|
} break;
|
|
}
|
|
|
|
ERR_FAIL_V(-1);
|
|
|
|
}
|
|
|
|
|
|
|
|
void Compression::decompress(uint8_t *p_dst, int p_dst_max_size, const uint8_t *p_src, int p_src_size,Mode p_mode){
|
|
|
|
switch(p_mode) {
|
|
case MODE_FASTLZ: {
|
|
|
|
if (p_dst_max_size<16) {
|
|
uint8_t dst[16];
|
|
fastlz_decompress(p_src,p_src_size,dst,16);
|
|
copymem(p_dst,dst,p_dst_max_size);
|
|
} else {
|
|
fastlz_decompress(p_src,p_src_size,p_dst,p_dst_max_size);
|
|
}
|
|
return;
|
|
} break;
|
|
case MODE_DEFLATE: {
|
|
|
|
z_stream strm;
|
|
strm.zalloc = zipio_alloc;
|
|
strm.zfree = zipio_free;
|
|
strm.opaque = Z_NULL;
|
|
strm.avail_in= 0;
|
|
strm.next_in=Z_NULL;
|
|
int err = inflateInit(&strm);
|
|
ERR_FAIL_COND(err!=Z_OK);
|
|
|
|
strm.avail_in=p_src_size;
|
|
strm.avail_out=p_dst_max_size;
|
|
strm.next_in=(Bytef*)p_src;
|
|
strm.next_out=p_dst;
|
|
|
|
err = inflate(&strm,Z_FINISH);
|
|
inflateEnd(&strm);
|
|
ERR_FAIL_COND(err!=Z_STREAM_END);
|
|
return;
|
|
} break;
|
|
}
|
|
|
|
ERR_FAIL();
|
|
}
|