mirror of https://github.com/OpenTTD/OpenTTD.git
51 lines
2.0 KiB
C++
51 lines
2.0 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file sprite_file.cpp Implementation of logic specific to the SpriteFile class. */
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#include "../stdafx.h"
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#include "sprite_file_type.hpp"
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/** Signature of a container version 2 GRF. */
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extern const uint8_t _grf_cont_v2_sig[8] = {'G', 'R', 'F', 0x82, 0x0D, 0x0A, 0x1A, 0x0A};
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/**
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* Get the container version of the currently opened GRF file.
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* @return Container version of the GRF file or 0 if the file is corrupt/no GRF file.
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*/
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static uint8_t GetGRFContainerVersion(SpriteFile &file)
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{
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size_t pos = file.GetPos();
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if (file.ReadWord() == 0) {
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/* Check for GRF container version 2, which is identified by the bytes
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* '47 52 46 82 0D 0A 1A 0A' at the start of the file. */
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for (const auto &expected_sig_byte : _grf_cont_v2_sig) {
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if (file.ReadByte() != expected_sig_byte) return 0; // Invalid format
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}
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return 2;
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}
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/* Container version 1 has no header, rewind to start. */
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file.SeekTo(pos, SEEK_SET);
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return 1;
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}
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/**
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* Create the SpriteFile.
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* @param filename Name of the file at the disk.
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* @param subdir The sub directory to search this file in.
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* @param palette_remap Whether a palette remap needs to be performed for this file.
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*/
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SpriteFile::SpriteFile(const std::string &filename, Subdirectory subdir, bool palette_remap)
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: RandomAccessFile(filename, subdir), palette_remap(palette_remap)
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{
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this->container_version = GetGRFContainerVersion(*this);
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this->content_begin = this->GetPos();
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}
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