mirror of
https://github.com/cc65/cc65.git
synced 2024-11-16 18:08:04 +00:00
126 lines
4.2 KiB
C
126 lines
4.2 KiB
C
/*****************************************************************************/
|
|
/* */
|
|
/* fileio.c */
|
|
/* */
|
|
/* File I/O for the sp65 sprite and bitmap utility */
|
|
/* */
|
|
/* */
|
|
/* */
|
|
/* (C) 1998-2012, Ullrich von Bassewitz */
|
|
/* Roemerstrasse 52 */
|
|
/* D-70794 Filderstadt */
|
|
/* EMail: uz@cc65.org */
|
|
/* */
|
|
/* */
|
|
/* This software is provided 'as-is', without any expressed or implied */
|
|
/* warranty. In no event will the authors be held liable for any damages */
|
|
/* arising from the use of this software. */
|
|
/* */
|
|
/* Permission is granted to anyone to use this software for any purpose, */
|
|
/* including commercial applications, and to alter it and redistribute it */
|
|
/* freely, subject to the following restrictions: */
|
|
/* */
|
|
/* 1. The origin of this software must not be misrepresented; you must not */
|
|
/* claim that you wrote the original software. If you use this software */
|
|
/* in a product, an acknowledgment in the product documentation would be */
|
|
/* appreciated but is not required. */
|
|
/* 2. Altered source versions must be plainly marked as such, and must not */
|
|
/* be misrepresented as being the original software. */
|
|
/* 3. This notice may not be removed or altered from any source */
|
|
/* distribution. */
|
|
/* */
|
|
/*****************************************************************************/
|
|
|
|
|
|
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
|
|
/* od65 */
|
|
#include "error.h"
|
|
#include "fileio.h"
|
|
|
|
|
|
|
|
/*****************************************************************************/
|
|
/* Code */
|
|
/*****************************************************************************/
|
|
|
|
|
|
|
|
void FileSetPos (FILE* F, unsigned long Pos)
|
|
/* Seek to the given absolute position, fail on errors */
|
|
{
|
|
if (fseek (F, Pos, SEEK_SET) != 0) {
|
|
Error ("Cannot seek: %s", strerror (errno));
|
|
}
|
|
}
|
|
|
|
|
|
|
|
unsigned long FileGetPos (FILE* F)
|
|
/* Return the current file position, fail on errors */
|
|
{
|
|
long Pos = ftell (F);
|
|
if (Pos < 0) {
|
|
Error ("Error in ftell: %s", strerror (errno));
|
|
}
|
|
return Pos;
|
|
}
|
|
|
|
|
|
|
|
unsigned Read8 (FILE* F)
|
|
/* Read an 8 bit value from the file */
|
|
{
|
|
int C = getc (F);
|
|
if (C == EOF) {
|
|
Error ("Read error (file corrupt?)");
|
|
}
|
|
return C;
|
|
}
|
|
|
|
|
|
|
|
unsigned Read16 (FILE* F)
|
|
/* Read a 16 bit value from the file */
|
|
{
|
|
unsigned Lo = Read8 (F);
|
|
unsigned Hi = Read8 (F);
|
|
return (Hi << 8) | Lo;
|
|
}
|
|
|
|
|
|
|
|
unsigned long Read24 (FILE* F)
|
|
/* Read a 24 bit value from the file */
|
|
{
|
|
unsigned long Lo = Read16 (F);
|
|
unsigned long Hi = Read8 (F);
|
|
return (Hi << 16) | Lo;
|
|
}
|
|
|
|
|
|
|
|
unsigned long Read32 (FILE* F)
|
|
/* Read a 32 bit value from the file */
|
|
{
|
|
unsigned long Lo = Read16 (F);
|
|
unsigned long Hi = Read16 (F);
|
|
return (Hi << 16) | Lo;
|
|
}
|
|
|
|
|
|
|
|
void* ReadData (FILE* F, void* Data, unsigned Size)
|
|
/* Read data from the file */
|
|
{
|
|
/* Accept zero sized reads */
|
|
if (Size > 0) {
|
|
if (fread (Data, 1, Size, F) != Size) {
|
|
Error ("Read error (file corrupt?)");
|
|
}
|
|
}
|
|
return Data;
|
|
}
|