git.sur5r.net Git - cc65/blob - src/sp65/input.c

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                  input.c                                  */
   4 /*                                                                           */
   5 /*   Input format/file definitions for the sp65 sprite and bitmap utility    */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2012,      Ullrich von Bassewitz                                      */
  10 /*                Roemerstrasse 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 <stdlib.h>
  37
  38 /* common */
  39 #include "fileid.h"
  40
  41 /* sp65 */
  42 #include "error.h"
  43 #include "input.h"
  44 #include "pcx.h"
  45
  46
  47
  48 /*****************************************************************************/
  49 /*                                   Data                                    */
  50 /*****************************************************************************/
  51
  52
  53
  54 typedef struct InputFormatDesc InputFormatDesc;
  55 struct InputFormatDesc {
  56
  57     /* Read routine */
  58     Bitmap* (*Read) (const char* Name);
  59
  60 };
  61
  62 /* Table with input formats */
  63 static InputFormatDesc InputFormatTable[ifCount] = {
  64     {   ReadPCXFile     },
  65 };
  66
  67 /* Table that maps extensions to input formats. Must be sorted alphabetically */
  68 static const FileId FormatTable[] = {
  69     /* Upper case stuff for obsolete operating systems */
  70     {   "PCX",  ifPCX           },
  71
  72     {   "pcx",  ifPCX           },
  73 };
  74
  75
  76
  77 /*****************************************************************************/
  78 /*                                   Code                                    */
  79 /*****************************************************************************/
  80
  81
  82
  83 int FindInputFormat (const char* Name)
  84 /* Find an input format by name. The function returns a value less than zero
  85  * if Name is not a known input format.
  86  */
  87 {
  88     /* Search for the entry in the table. */
  89     const FileId* F = bsearch (Name,
  90                                FormatTable,
  91                                sizeof (FormatTable) / sizeof (FormatTable[0]),
  92                                sizeof (FormatTable[0]),
  93                                CompareFileId);
  94
  95     /* Return the id or an error code */
  96     return (F == 0)? -1 : F->Id;
  97 }
  98
  99
 100
 101 Bitmap* ReadInputFile (const char* Name, InputFormat Format)
 102 /* Read a bitmap from a file and return it. If Format is ifAuto, the routine
 103  * tries to determine the format from the file name extension.
 104  */
 105 {
 106     /* If the format is Auto, try to determine it from the file name */
 107     if (Format == ifAuto) {
 108         /* Search for the entry in the table */
 109         const FileId* F = GetFileId (Name, FormatTable,
 110                                      sizeof (FormatTable) / sizeof (FormatTable[0]));
 111         /* Found? */
 112         if (F == 0) {
 113             Error ("Cannot determine file format of input file `%s'", Name);
 114         }
 115         Format = F->Id;
 116     }
 117
 118     /* Check the format just for safety */
 119     CHECK (Format >= 0 && Format < ifCount);
 120
 121     /* Call the format specific read */
 122     return InputFormatTable[Format].Read (Name);
 123 }
 124
 125
 126