392 lines
10 KiB
C++
392 lines
10 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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/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
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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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