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https://github.com/godotengine/godot.git
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c7bc44d5ad
That year should bring the long-awaited OpenGL ES 3.0 compatible renderer with state-of-the-art rendering techniques tuned to work as low as middle end handheld devices - without compromising with the possibilities given for higher end desktop games of course. Great times ahead for the Godot community and the gamers that will play our games!
422 lines
9.3 KiB
C++
422 lines
9.3 KiB
C++
/*************************************************************************/
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/* file_access_compressed.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "file_access_compressed.h"
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#include "print_string.h"
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void FileAccessCompressed::configure(const String& p_magic, Compression::Mode p_mode, int p_block_size) {
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magic=p_magic.ascii().get_data();
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if (magic.length()>4)
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magic=magic.substr(0,4);
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else {
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while(magic.length()<4)
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magic+=" ";
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}
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cmode=p_mode;
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block_size=p_block_size;
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}
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#define WRITE_FIT(m_bytes) \
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{\
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if (write_pos+(m_bytes) > write_max) {\
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write_max=write_pos+(m_bytes);\
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}\
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if (write_max > write_buffer_size) {\
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write_buffer_size = nearest_power_of_2( write_max );\
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buffer.resize(write_buffer_size);\
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write_ptr=buffer.ptr();\
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}\
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}
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Error FileAccessCompressed::open_after_magic(FileAccess *p_base) {
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f=p_base;
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cmode=(Compression::Mode)f->get_32();
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block_size=f->get_32();
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read_total=f->get_32();
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int bc = (read_total/block_size)+1;
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int acc_ofs=f->get_pos()+bc*4;
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int max_bs=0;
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for(int i=0;i<bc;i++) {
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ReadBlock rb;
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rb.offset=acc_ofs;
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rb.csize=f->get_32();
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acc_ofs+=rb.csize;
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max_bs=MAX(max_bs,rb.csize);
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read_blocks.push_back(rb);
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}
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comp_buffer.resize(max_bs);
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buffer.resize(block_size);
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read_ptr=buffer.ptr();
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f->get_buffer(comp_buffer.ptr(),read_blocks[0].csize);
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at_end=false;
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read_eof=false;
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read_block_count=bc;
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read_block_size=read_blocks.size()==1?read_total:block_size;
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Compression::decompress(buffer.ptr(),read_block_size,comp_buffer.ptr(),read_blocks[0].csize,cmode);
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read_block=0;
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read_pos=0;
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return OK;
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}
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Error FileAccessCompressed::_open(const String& p_path, int p_mode_flags){
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ERR_FAIL_COND_V(p_mode_flags==READ_WRITE,ERR_UNAVAILABLE);
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if (f)
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close();
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Error err;
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f = FileAccess::open(p_path,p_mode_flags,&err);
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if (err!=OK) {
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//not openable
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f=NULL;
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return err;
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}
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if (p_mode_flags&WRITE) {
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buffer.clear();
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writing=true;
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write_pos=0;
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write_buffer_size=256;
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buffer.resize(256);
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write_max=0;
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write_ptr=buffer.ptr();
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//don't store anything else unless it's done saving!
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} else {
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char rmagic[5];
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f->get_buffer((uint8_t*)rmagic,4);
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rmagic[4]=0;
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if (magic!=rmagic) {
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memdelete(f);
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f=NULL;
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return ERR_FILE_UNRECOGNIZED;
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}
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open_after_magic(f);
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}
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return OK;
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}
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void FileAccessCompressed::close(){
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if (!f)
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return;
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if (writing) {
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//save block table and all compressed blocks
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CharString mgc = magic.utf8();
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f->store_buffer((const uint8_t*)mgc.get_data(),mgc.length()); //write header 4
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f->store_32(cmode); //write compression mode 4
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f->store_32(block_size); //write block size 4
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f->store_32(write_max); //max amount of data written 4
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int bc=(write_max/block_size)+1;
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for(int i=0;i<bc;i++) {
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f->store_32(0); //compressed sizes, will update later
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}
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Vector<int> block_sizes;
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for(int i=0;i<bc;i++) {
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int bl = i==(bc-1) ? write_max % block_size : block_size;
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uint8_t *bp = &write_ptr[i*block_size];
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Vector<uint8_t> cblock;
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cblock.resize(Compression::get_max_compressed_buffer_size(bl,cmode));
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int s = Compression::compress(cblock.ptr(),bp,bl,cmode);
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f->store_buffer(cblock.ptr(),s);
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block_sizes.push_back(s);
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}
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f->seek(16); //ok write block sizes
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for(int i=0;i<bc;i++)
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f->store_32(block_sizes[i]);
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f->seek_end();
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f->store_buffer((const uint8_t*)mgc.get_data(),mgc.length()); //magic at the end too
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buffer.clear();
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} else {
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comp_buffer.clear();
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buffer.clear();
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read_blocks.clear();
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}
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memdelete(f);
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f=NULL;
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}
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bool FileAccessCompressed::is_open() const{
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return f!=NULL;
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}
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void FileAccessCompressed::seek(size_t p_position){
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ERR_FAIL_COND(!f);
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if (writing) {
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ERR_FAIL_COND(p_position>write_max);
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write_pos=p_position;
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} else {
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ERR_FAIL_COND(p_position>read_total);
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if (p_position==read_total) {
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at_end=true;
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} else {
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int block_idx = p_position/block_size;
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if (block_idx!=read_block) {
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read_block=block_idx;
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f->seek(read_blocks[read_block].offset);
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f->get_buffer(comp_buffer.ptr(),read_blocks[read_block].csize);
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Compression::decompress(buffer.ptr(),read_blocks.size()==1?read_total:block_size,comp_buffer.ptr(),read_blocks[read_block].csize,cmode);
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read_block_size=read_block==read_block_count-1?read_total%block_size:block_size;
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}
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read_pos=p_position%block_size;
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}
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}
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}
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void FileAccessCompressed::seek_end(int64_t p_position){
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ERR_FAIL_COND(!f);
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if (writing) {
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seek(write_max+p_position);
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} else {
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seek(read_total+p_position);
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}
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}
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size_t FileAccessCompressed::get_pos() const{
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ERR_FAIL_COND_V(!f,0);
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if (writing) {
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return write_pos;
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} else {
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return read_block*block_size+read_pos;
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}
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}
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size_t FileAccessCompressed::get_len() const{
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ERR_FAIL_COND_V(!f,0);
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if (writing) {
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return write_max;
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} else {
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return read_total;
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}
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}
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bool FileAccessCompressed::eof_reached() const{
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ERR_FAIL_COND_V(!f,false);
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if (writing) {
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return false;
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} else {
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return read_eof;
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}
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}
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uint8_t FileAccessCompressed::get_8() const{
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ERR_FAIL_COND_V(writing,0);
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ERR_FAIL_COND_V(!f,0);
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if (at_end) {
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read_eof=true;
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return 0;
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}
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uint8_t ret = read_ptr[read_pos];
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read_pos++;
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if (read_pos>=read_block_size) {
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read_block++;
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if (read_block<read_block_count) {
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//read another block of compressed data
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f->get_buffer(comp_buffer.ptr(),read_blocks[read_block].csize);
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Compression::decompress(buffer.ptr(),read_blocks.size()==1?read_total:block_size,comp_buffer.ptr(),read_blocks[read_block].csize,cmode);
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read_block_size=read_block==read_block_count-1?read_total%block_size:block_size;
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read_pos=0;
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} else {
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read_block--;
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at_end=true;
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ret =0;
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}
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}
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return ret;
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}
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int FileAccessCompressed::get_buffer(uint8_t *p_dst, int p_length) const{
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ERR_FAIL_COND_V(writing,0);
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ERR_FAIL_COND_V(!f,0);
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if (at_end) {
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read_eof=true;
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return 0;
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}
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for(int i=0;i<p_length;i++) {
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p_dst[i]=read_ptr[read_pos];
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read_pos++;
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if (read_pos>=read_block_size) {
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read_block++;
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if (read_block<read_block_count) {
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//read another block of compressed data
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f->get_buffer(comp_buffer.ptr(),read_blocks[read_block].csize);
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Compression::decompress(buffer.ptr(),read_blocks.size()==1?read_total:block_size,comp_buffer.ptr(),read_blocks[read_block].csize,cmode);
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read_block_size=read_block==read_block_count-1?read_total%block_size:block_size;
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read_pos=0;
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} else {
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read_block--;
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at_end=true;
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if (i<p_length-1)
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read_eof=true;
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return i;
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}
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}
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}
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return p_length;
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}
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Error FileAccessCompressed::get_error() const{
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return read_eof?ERR_FILE_EOF:OK;
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}
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void FileAccessCompressed::store_8(uint8_t p_dest){
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ERR_FAIL_COND(!f);
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ERR_FAIL_COND(!writing);
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WRITE_FIT(1);
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write_ptr[write_pos++]=p_dest;
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}
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bool FileAccessCompressed::file_exists(const String& p_name){
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FileAccess *fa = FileAccess::open(p_name,FileAccess::READ);
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if (!fa)
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return false;
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memdelete(fa);
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return true;
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}
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uint64_t FileAccessCompressed::_get_modified_time(const String& p_file) {
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if (f)
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return f->get_modified_time(p_file);
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else
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return 0;
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}
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FileAccessCompressed::FileAccessCompressed() {
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f=NULL;
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magic="GCMP";
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block_size=16384;
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cmode=Compression::MODE_DEFLATE;
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writing=false;
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write_ptr=0;
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write_buffer_size=0;
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write_max=0;
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block_size=0;
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read_eof=false;
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at_end=false;
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read_total=0;
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read_ptr=NULL;
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read_block=0;
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read_block_count=0;
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read_block_size=0;
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read_pos=0;
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}
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FileAccessCompressed::~FileAccessCompressed(){
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if (f)
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close();
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}
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