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/* $Id: io.cpp 17979 2009-11-05 22:11:04Z rubidium $ */
/*
* catcodec is a tool to decode/encode the sample catalogue for OpenTTD.
* Copyright (C) 2009 Remko Bijker
*
* This program 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.
*
* This program 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. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/** @file io.cpp Implementation of reading/writing to files */
#include "stdafx.h"
#include "io.hpp"
FileReader::FileReader(string filename, bool binary)
{
this->file = fopen(filename.c_str(), binary ? "rb" : "r");
this->filename = filename;
if (this->file == NULL) {
throw "Could not open " + filename + " for reading";
}
}
FileReader::~FileReader()
{
fclose(this->file);
}
uint8_t FileReader::ReadByte()
{
uint8_t b;
this->ReadRaw(&b, 1);
return b;
}
uint16_t FileReader::ReadWord()
{
uint16_t b = this->ReadByte();
return (this->ReadByte() << 8) | b;
}
uint32_t FileReader::ReadDword()
{
uint32_t b = this->ReadWord();
return (this->ReadWord() << 16) | b;
}
void FileReader::ReadRaw(uint8_t *in, size_t amount)
{
if (fread(in, 1, amount, this->file) != amount) {
throw "Unexpected end of " + this->filename;
}
}
char *FileReader::ReadLine(char *in, int length)
{
char *ret = fgets(in, length, this->file);
/* fgets doesn't guarantee string termination if no newline/EOF is found */
in[length - 1] = '\0';
return ret;
}
void FileReader::Seek(uint32_t pos)
{
if (fseek(this->file, pos, SEEK_SET) != 0) throw "Seeking in " + this->filename + " failed.";
}
uint32_t FileReader::GetPos()
{
return ftell(this->file);
}
string FileReader::GetFilename() const
{
return this->filename;
}
FileWriter::FileWriter(string filename, bool binary)
{
this->filename_new = filename + ".new";
this->filename = filename;
this->file = fopen(filename_new.c_str(), binary ? "w+b" : "w+");
if (this->file == NULL) {
throw "Could not open " + this->filename_new + " for writing";
}
}
FileWriter::~FileWriter()
{
if (this->file != NULL) {
fclose(this->file);
unlink(this->filename_new.c_str());
}
}
void FileWriter::WriteByte(uint8_t data)
{
this->WriteRaw(&data, 1);
}
void FileWriter::WriteWord(uint16_t data)
{
this->WriteByte(data & 0xFF);
this->WriteByte(data >> 8);
}
void FileWriter::WriteDword(uint32_t data)
{
this->WriteWord(data & 0xFFFF);
this->WriteWord(data >> 16);
}
void FileWriter::WriteRaw(const uint8_t *out, size_t amount)
{
assert(this->file != NULL);
if (fwrite(out, 1, amount, this->file) != amount) {
throw "Unexpected failure while writing to " + this->filename;
}
}
void FileWriter::WriteString(const char *format, ...)
{
assert(this->file != NULL);
va_list ap;
va_start(ap, format);
if (vfprintf(this->file, format, ap) < 0) {
throw "Unexpected failure while writing to " + this->filename;
}
va_end(ap);
}
uint32_t FileWriter::GetPos()
{
assert(this->file != NULL);
return ftell(this->file);
}
string FileWriter::GetFilename() const
{
return this->filename;
}
void FileWriter::Close()
{
/* First close the .new file */
fclose(this->file);
this->file = NULL;
/* Then remove the existing .bak file */
string filename_bak = this->filename + ".bak";
if (unlink(filename_bak.c_str()) != 0 && errno != ENOENT) {
fprintf(stderr, "Warning: could not remove %s (%s)\n", filename_bak.c_str(), strerror(errno));
}
/* Then move the existing file to .bak */
if (rename(this->filename.c_str(), filename_bak.c_str()) != 0 && errno != ENOENT) {
fprintf(stderr, "Warning: could not rename %s to %s (%s)\n", this->filename.c_str(), filename_bak.c_str(), strerror(errno));
}
/* And finally move the .new file to the actual wanted filename */
if (rename(this->filename_new.c_str(), this->filename.c_str()) != 0) {
fprintf(stderr, "Warning: could not rename %s to %s (%s)\n", this->filename_new.c_str(), this->filename.c_str(), strerror(errno));
throw "Could not close " + this->filename;
}
}
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