151 lines
4.9 KiB
C++
151 lines
4.9 KiB
C++
/*************************************************************************/
|
|
/* file_access_buffered.cpp */
|
|
/*************************************************************************/
|
|
/* This file is part of: */
|
|
/* GODOT ENGINE */
|
|
/* https://godotengine.org */
|
|
/*************************************************************************/
|
|
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
|
|
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
|
|
/* */
|
|
/* 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 "core/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);
|
|
}
|
|
|
|
return cache.buffer.size() - (file.offset - cache.offset);
|
|
}
|
|
|
|
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_position() 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_MSG(!file.open, 0, "Can't get data, when file is not opened.");
|
|
|
|
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_length) const {
|
|
ERR_FAIL_COND_V_MSG(!file.open, -1, "Can't get buffer, when file is not opened.");
|
|
|
|
if (p_length > 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);
|
|
//const uint8_t* read = cache.buffer.ptr();
|
|
//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_length -= size;
|
|
file.offset += size;
|
|
total_read += size;
|
|
}
|
|
|
|
int err = read_data_block(file.offset, p_length, p_dest);
|
|
if (err >= 0) {
|
|
total_read += err;
|
|
file.offset += err;
|
|
}
|
|
|
|
return total_read;
|
|
}
|
|
|
|
int to_read = p_length;
|
|
int total_read = 0;
|
|
while (to_read > 0) {
|
|
int left = cache_data_left();
|
|
if (left == 0) {
|
|
file.offset += to_read;
|
|
return total_read;
|
|
}
|
|
if (left < 0) {
|
|
return left;
|
|
}
|
|
|
|
int r = MIN(left, to_read);
|
|
//const uint8_t* read = cache.buffer.ptr();
|
|
//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_length;
|
|
}
|
|
|
|
bool FileAccessBuffered::is_open() const {
|
|
return file.open;
|
|
}
|
|
|
|
Error FileAccessBuffered::get_error() const {
|
|
return last_error;
|
|
}
|