Files @ r3303:1bae0f5399a4
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Location: cpp/openttd-patchpack/source/fileio.c - annotation

bjarni
(svn r4060) -Codechange: [OSX] made the release target (in os/macosx/Makefile) easier to use since it gives the release disk image the right name automatically
it now uses REV instead of RELEASE, which means RELEASE is not needed to be set manaully anymore
it also automatically adds "-jaguar" when making a build aimed at OSX 10.2 (codenamed jaguar)
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/* $Id$ */

#include "stdafx.h"
#include "openttd.h"
#include "fileio.h"
#include "functions.h"
#include "macros.h"
#include "variables.h"
#if defined(UNIX) || defined(__OS2__)
#include <ctype.h> // required for tolower()
#endif

/*************************************************/
/* FILE IO ROUTINES ******************************/
/*************************************************/

#define FIO_BUFFER_SIZE 512

typedef struct {
	byte *buffer, *buffer_end;
	uint32 pos;
	FILE *cur_fh;
	FILE *handles[32];
	byte buffer_start[512];
} Fio;

static Fio _fio;

// Get current position in file
uint32 FioGetPos(void)
{
	return _fio.pos + (_fio.buffer - _fio.buffer_start) - FIO_BUFFER_SIZE;
}

void FioSeekTo(uint32 pos, int mode)
{
	if (mode == SEEK_CUR) pos += FioGetPos();
	_fio.buffer = _fio.buffer_end = _fio.buffer_start + FIO_BUFFER_SIZE;
	fseek(_fio.cur_fh, (_fio.pos=pos), SEEK_SET);
}

// Seek to a file and a position
void FioSeekToFile(uint32 pos)
{
	FILE *f = _fio.handles[pos >> 24];
	assert(f != NULL);
	_fio.cur_fh = f;
	FioSeekTo(pos & 0xFFFFFF, SEEK_SET);
}

byte FioReadByte(void)
{
	if (_fio.buffer == _fio.buffer_end) {
		_fio.pos += FIO_BUFFER_SIZE;
		fread(_fio.buffer = _fio.buffer_start, 1, FIO_BUFFER_SIZE, _fio.cur_fh);
	}
	return *_fio.buffer++;
}

void FioSkipBytes(int n)
{
	for (;;) {
		int m = min(_fio.buffer_end - _fio.buffer, n);
		_fio.buffer += m;
		n -= m;
		if (n == 0) break;
		FioReadByte();
		n--;
	}
}


uint16 FioReadWord(void)
{
	byte b = FioReadByte();
	return (FioReadByte() << 8) | b;
}

uint32 FioReadDword(void)
{
	uint b = FioReadWord();
	return (FioReadWord() << 16) | b;
}

void FioReadBlock(void *ptr, uint size)
{
	FioSeekTo(FioGetPos(), SEEK_SET);
	_fio.pos += size;
	fread(ptr, 1, size, _fio.cur_fh);
}

static inline void FioCloseFile(int slot)
{
	if (_fio.handles[slot] != NULL) {
		fclose(_fio.handles[slot]);
		_fio.handles[slot] = NULL;
	}
}

void FioCloseAll(void)
{
	int i;

	for (i = 0; i != lengthof(_fio.handles); i++)
		FioCloseFile(i);
}

bool FiosCheckFileExists(const char *filename)
{
	FILE *f;
	char buf[MAX_PATH];

	sprintf(buf, "%s%s", _path.data_dir, filename);

	f = fopen(buf, "rb");
#if !defined(WIN32)
	if (f == NULL) {
		char *s;
		// Make lower case and try again
		for (s = buf + strlen(_path.data_dir) - 1; *s != 0; s++)
			*s = tolower(*s);
		f = fopen(buf, "rb");

#if defined SECOND_DATA_DIR
	// tries in the 2nd data directory
		if (f == NULL) {
			sprintf(buf, "%s%s", _path.second_data_dir, filename);
			for (s = buf + strlen(_path.second_data_dir) - 1; *s != 0; s++)
			*s = tolower(*s);
		f = fopen(buf, "rb");
		}
#endif
	}
#endif

	if (f == NULL)
		return false;
	else {
		fclose(f);
		return true;
	}
}

FILE *FioFOpenFile(const char *filename)
{
	FILE *f;
	char buf[MAX_PATH];

	sprintf(buf, "%s%s", _path.data_dir, filename);

	f = fopen(buf, "rb");
#if !defined(WIN32)
	if (f == NULL) {
		char *s;
		// Make lower case and try again
		for (s = buf + strlen(_path.data_dir) - 1; *s != 0; s++)
			*s = tolower(*s);
		f = fopen(buf, "rb");

#if defined SECOND_DATA_DIR
		// tries in the 2nd data directory
		if (f == NULL) {
			sprintf(buf, "%s%s", _path.second_data_dir, filename);
			for (s = buf + strlen(_path.second_data_dir) - 1; *s != 0; s++)
				*s = tolower(*s);
			f = fopen(buf, "rb");
		}
#endif
	}
#endif

	return f;
}

void FioOpenFile(int slot, const char *filename)
{
	FILE *f;
	char buf[MAX_PATH];

	sprintf(buf, "%s%s", _path.data_dir, filename);

	f = fopen(buf, "rb");
#if !defined(WIN32)
	if (f == NULL) {
		char *s;
		// Make lower case and try again
		for (s = buf + strlen(_path.data_dir) - 1; *s != 0; s++)
			*s = tolower(*s);
		f = fopen(buf, "rb");

#if defined SECOND_DATA_DIR
	// tries in the 2nd data directory
		if (f == NULL) {
			sprintf(buf, "%s%s", _path.second_data_dir, filename);
			for (s = buf + strlen(_path.second_data_dir) - 1; *s != 0; s++)
			*s = tolower(*s);
		f = fopen(buf, "rb");
		}

	if (f == NULL)
		sprintf(buf, "%s%s", _path.data_dir, filename);	//makes it print the primary datadir path instead of the secundary one

#endif
	}
#endif

	if (f == NULL)
		error("Cannot open file '%s'", buf);

	FioCloseFile(slot); // if file was opened before, close it
	_fio.handles[slot] = f;
	FioSeekToFile(slot << 24);
}