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