git.sur5r.net Git - cc65/blob - src/co65/fileio.c

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                 fileio.c                                  */
   4 /*                                                                           */
   5 /*              Binary file I/O for the co65 object file converter           */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 1998-2003 Ullrich von Bassewitz                                       */
  10 /*               Römerstrasse 52                                             */
  11 /*               D-70794 Filderstadt                                         */
  12 /* EMail:        uz@cc65.org                                                 */
  13 /*                                                                           */
  14 /*                                                                           */
  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.                                    */
  18 /*                                                                           */
  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:                            */
  22 /*                                                                           */
  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              */
  30 /*    distribution.                                                          */
  31 /*                                                                           */
  32 /*****************************************************************************/
  33
  34
  35
  36 #include <string.h>
  37
  38 /* common */
  39 #include "xmalloc.h"
  40
  41 /* ld65 */
  42 #include "error.h"
  43 #include "fileio.h"
  44
  45
  46
  47 /*****************************************************************************/
  48 /*                                   Code                                    */
  49 /*****************************************************************************/
  50
  51
  52
  53 unsigned Read8 (FILE* F)
  54 /* Read an 8 bit value from the file */
  55 {
  56     int C = getc (F);
  57     if (C == EOF) {
  58         Error ("Read error (file corrupt?)");
  59     }
  60     return C;
  61 }
  62
  63
  64
  65 unsigned Read16 (FILE* F)
  66 /* Read a 16 bit value from the file */
  67 {
  68     unsigned Lo = Read8 (F);
  69     unsigned Hi = Read8 (F);
  70     return (Hi << 8) | Lo;
  71 }
  72
  73
  74
  75 unsigned long Read24 (FILE* F)
  76 /* Read a 24 bit value from the file */
  77 {
  78     unsigned long Lo = Read16 (F);
  79     unsigned long Hi = Read8 (F);
  80     return (Hi << 16) | Lo;
  81 }
  82
  83
  84
  85 unsigned long Read32 (FILE* F)
  86 /* Read a 32 bit value from the file */
  87 {
  88     unsigned long Lo = Read16 (F);
  89     unsigned long Hi = Read16 (F);
  90     return (Hi << 16) | Lo;
  91 }
  92
  93
  94
  95 void* ReadData (FILE* F, void* Data, unsigned Size)
  96 /* Read data from the file */
  97 {
  98     /* Explicitly allow reading zero bytes */
  99     if (Size > 0) {
 100         if (fread (Data, 1, Size, F) != Size) {
 101             Error ("Read error (file corrupt?)");
 102         }
 103     }
 104     return Data;
 105 }