/*************************************************************************/ /* file_access_buffered.cpp */ /*************************************************************************/ /* This file is part of: */ /* GODOT ENGINE */ /* http://www.godotengine.org */ /*************************************************************************/ /* Copyright (c) 2007-2016 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 "file_access_buffered.h" #include <string.h> #include "error_macros.h" Error FileAccessBuffered::set_error(Error p_error) const { return (last_error = p_error); }; void FileAccessBuffered::set_cache_size(int p_size) { cache_size = p_size; }; int FileAccessBuffered::get_cache_size() { return cache_size; }; int FileAccessBuffered::cache_data_left() const { if (file.offset >= file.size) { return 0; }; if (cache.offset == -1 || file.offset < cache.offset || file.offset >= cache.offset + cache.buffer.size()) { return read_data_block(file.offset, cache_size); } else { return cache.buffer.size() - (file.offset - cache.offset); }; return 0; }; void FileAccessBuffered::seek(size_t p_position) { file.offset = p_position; }; void FileAccessBuffered::seek_end(int64_t p_position) { file.offset = file.size + p_position; }; size_t FileAccessBuffered::get_pos() const { return file.offset; }; size_t FileAccessBuffered::get_len() const { return file.size; }; bool FileAccessBuffered::eof_reached() const { return file.offset > file.size; }; uint8_t FileAccessBuffered::get_8() const { ERR_FAIL_COND_V(!file.open,0); uint8_t byte = 0; if (cache_data_left() >= 1) { byte = cache.buffer[file.offset - cache.offset]; }; ++file.offset; return byte; }; int FileAccessBuffered::get_buffer(uint8_t *p_dest,int p_elements) const { ERR_FAIL_COND_V(!file.open, -1); if (p_elements > cache_size) { int total_read = 0; if (!(cache.offset == -1 || file.offset < cache.offset || file.offset >= cache.offset + cache.buffer.size())) { int size = (cache.buffer.size() - (file.offset - cache.offset)); size = size - (size % 4); //DVector<uint8_t>::Read read = cache.buffer.read(); //memcpy(p_dest, read.ptr() + (file.offset - cache.offset), size); memcpy(p_dest, cache.buffer.ptr() + (file.offset - cache.offset), size); p_dest += size; p_elements -= size; file.offset += size; total_read += size; }; int err = read_data_block(file.offset, p_elements, p_dest); if (err >= 0) { total_read += err; file.offset += err; }; return total_read; }; int to_read = p_elements; int total_read = 0; while (to_read > 0) { int left = cache_data_left(); if (left == 0) { if (to_read > 0) { file.offset += to_read; }; return total_read; }; if (left < 0) { return left; }; int r = MIN(left, to_read); //DVector<uint8_t>::Read read = cache.buffer.read(); //memcpy(p_dest+total_read, &read.ptr()[file.offset - cache.offset], r); memcpy(p_dest+total_read, cache.buffer.ptr() + (file.offset - cache.offset), r); file.offset += r; total_read += r; to_read -= r; }; return p_elements; }; bool FileAccessBuffered::is_open() const { return file.open; }; Error FileAccessBuffered::get_error() const { return last_error; }; FileAccessBuffered::FileAccessBuffered() { cache_size = DEFAULT_CACHE_SIZE; }; FileAccessBuffered::~FileAccessBuffered(){ }