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 "attr.h"
  43 #include "error.h"
  44 #include "input.h"
  45 #include "pcx.h"
  46
  47
  48
  49 /*****************************************************************************/
  50 /*                                   Data                                    */
  51 /*****************************************************************************/
  52
  53
  54
  55 /* Possible input formats */
  56 enum InputFormat {
  57     ifPCX,                      /* PCX */
  58     ifCount                     /* Number of actual input formats w/o ifAuto*/
  59 };
  60
  61 typedef struct InputFormatDesc InputFormatDesc;
  62 struct InputFormatDesc {
  63     /* Read routine */
  64     Bitmap* (*Read) (const Collection*);
  65 };
  66
  67 /* Table with input formats indexed by InputFormat */
  68 static InputFormatDesc InputFormatTable[ifCount] = {
  69     {   ReadPCXFile     },
  70 };
  71
  72 /* Table that maps extensions to input formats. Must be sorted alphabetically */
  73 static const FileId FormatTable[] = {
  74     /* Upper case stuff for obsolete operating systems */
  75     {   "PCX",  ifPCX           },
  76
  77     {   "pcx",  ifPCX           },
  78 };
  79
  80
  81
  82 /*****************************************************************************/
  83 /*                                   Code                                    */
  84 /*****************************************************************************/
  85
  86
  87
  88 Bitmap* ReadInputFile (const Collection* A)
  89 /* Read a bitmap from a file and return it. Format, file name etc. must be
  90 ** given as attributes in A. If no format is given, the function tries to
  91 ** autodetect it by using the extension of the file name.
  92 */
  93 {
  94     const FileId* F;
  95
  96     /* Get the file format from the command line */
  97     const char* Format = GetAttrVal (A, "format");
  98     if (Format != 0) {
  99         /* Format is given, search for it in the table. */
 100         F = bsearch (Format,
 101                      FormatTable,
 102                      sizeof (FormatTable) / sizeof (FormatTable[0]),
 103                      sizeof (FormatTable[0]),
 104                      CompareFileId);
 105         if (F == 0) {
 106             Error ("Unknown input format '%s'", Format);
 107         }
 108     } else {
 109         /* No format given, use file name extension */
 110         const char* Name = NeedAttrVal (A, "name", "write");
 111         F = GetFileId (Name, FormatTable,
 112                        sizeof (FormatTable) / sizeof (FormatTable[0]));
 113         /* Found? */
 114         if (F == 0) {
 115             Error ("Cannot determine file format of input file '%s'", Name);
 116         }
 117     }
 118
 119     /* Call the format specific read */
 120     return InputFormatTable[F->Id].Read (A);
 121 }