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 */
56enum InputFormat {
57 ifPCX, /* PCX */
58 ifCount /* Number of actual input formats w/o ifAuto*/
59};
60
61typedef struct InputFormatDesc InputFormatDesc;
62struct InputFormatDesc {
63 /* Read routine */
64 Bitmap* (*Read) (const Collection*);
65};
66
67/* Table with input formats indexed by InputFormat */
68static InputFormatDesc InputFormatTable[ifCount] = {
69 { ReadPCXFile },
70};
71
72/* Table that maps extensions to input formats. Must be sorted alphabetically */
73static 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
88Bitmap* 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}
122