1 /*****************************************************************************/
5 /* File I/O for the sp65 sprite and bitmap utility */
9 /* (C) 1998-2012, Ullrich von Bassewitz */
10 /* Roemerstrasse 52 */
11 /* D-70794 Filderstadt */
12 /* EMail: uz@cc65.org */
15 /* This software is provided 'as-is', without any expressed or implied */
16 /* warranty. In no event will the authors be held liable for any damages */
17 /* arising from the use of this software. */
19 /* Permission is granted to anyone to use this software for any purpose, */
20 /* including commercial applications, and to alter it and redistribute it */
21 /* freely, subject to the following restrictions: */
23 /* 1. The origin of this software must not be misrepresented; you must not */
24 /* claim that you wrote the original software. If you use this software */
25 /* in a product, an acknowledgment in the product documentation would be */
26 /* appreciated but is not required. */
27 /* 2. Altered source versions must be plainly marked as such, and must not */
28 /* be misrepresented as being the original software. */
29 /* 3. This notice may not be removed or altered from any source */
32 /*****************************************************************************/
45 /*****************************************************************************/
47 /*****************************************************************************/
51 void FileSetPos (FILE* F, unsigned long Pos)
52 /* Seek to the given absolute position, fail on errors */
54 if (fseek (F, Pos, SEEK_SET) != 0) {
55 Error ("Cannot seek: %s", strerror (errno));
61 unsigned long FileGetPos (FILE* F)
62 /* Return the current file position, fail on errors */
66 Error ("Error in ftell: %s", strerror (errno));
73 unsigned Read8 (FILE* F)
74 /* Read an 8 bit value from the file */
78 Error ("Read error (file corrupt?)");
85 unsigned Read16 (FILE* F)
86 /* Read a 16 bit value from the file */
88 unsigned Lo = Read8 (F);
89 unsigned Hi = Read8 (F);
90 return (Hi << 8) | Lo;
95 unsigned long Read24 (FILE* F)
96 /* Read a 24 bit value from the file */
98 unsigned long Lo = Read16 (F);
99 unsigned long Hi = Read8 (F);
100 return (Hi << 16) | Lo;
105 unsigned long Read32 (FILE* F)
106 /* Read a 32 bit value from the file */
108 unsigned long Lo = Read16 (F);
109 unsigned long Hi = Read16 (F);
110 return (Hi << 16) | Lo;
115 void* ReadData (FILE* F, void* Data, unsigned Size)
116 /* Read data from the file */
118 /* Accept zero sized reads */
120 if (fread (Data, 1, Size, F) != Size) {
121 Error ("Read error (file corrupt?)");