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Commit | Line | Data |
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ef416fc2 | 1 | //======================================================================== |
2 | // | |
3 | // FoFiBase.cc | |
4 | // | |
5 | // Copyright 1999-2003 Glyph & Cog, LLC | |
6 | // | |
7 | //======================================================================== | |
8 | ||
9 | #include <config.h> | |
10 | ||
11 | #ifdef USE_GCC_PRAGMAS | |
12 | #pragma implementation | |
13 | #endif | |
14 | ||
15 | #include <stdio.h> | |
16 | #include "gmem.h" | |
17 | #include "FoFiBase.h" | |
18 | ||
19 | //------------------------------------------------------------------------ | |
20 | // FoFiBase | |
21 | //------------------------------------------------------------------------ | |
22 | ||
23 | FoFiBase::FoFiBase(char *fileA, int lenA, GBool freeFileDataA) { | |
24 | fileData = file = (Guchar *)fileA; | |
25 | len = lenA; | |
26 | freeFileData = freeFileDataA; | |
27 | } | |
28 | ||
29 | FoFiBase::~FoFiBase() { | |
30 | if (freeFileData) { | |
31 | gfree(fileData); | |
32 | } | |
33 | } | |
34 | ||
35 | char *FoFiBase::readFile(char *fileName, int *fileLen) { | |
36 | FILE *f; | |
37 | char *buf; | |
38 | int n; | |
39 | ||
40 | if (!(f = fopen(fileName, "rb"))) { | |
41 | return NULL; | |
42 | } | |
43 | fseek(f, 0, SEEK_END); | |
44 | n = (int)ftell(f); | |
45 | fseek(f, 0, SEEK_SET); | |
46 | buf = (char *)gmalloc(n); | |
47 | if ((int)fread(buf, 1, n, f) != n) { | |
48 | gfree(buf); | |
49 | fclose(f); | |
50 | return NULL; | |
51 | } | |
52 | fclose(f); | |
53 | *fileLen = n; | |
54 | return buf; | |
55 | } | |
56 | ||
57 | int FoFiBase::getS8(int pos, GBool *ok) { | |
58 | int x; | |
59 | ||
60 | if (pos < 0 || pos >= len) { | |
61 | *ok = gFalse; | |
62 | return 0; | |
63 | } | |
64 | x = file[pos]; | |
65 | if (x & 0x80) { | |
66 | x |= ~0xff; | |
67 | } | |
68 | return x; | |
69 | } | |
70 | ||
71 | int FoFiBase::getU8(int pos, GBool *ok) { | |
72 | if (pos < 0 || pos >= len) { | |
73 | *ok = gFalse; | |
74 | return 0; | |
75 | } | |
76 | return file[pos]; | |
77 | } | |
78 | ||
79 | int FoFiBase::getS16BE(int pos, GBool *ok) { | |
80 | int x; | |
81 | ||
82 | if (pos < 0 || pos+1 >= len) { | |
83 | *ok = gFalse; | |
84 | return 0; | |
85 | } | |
86 | x = file[pos]; | |
87 | x = (x << 8) + file[pos+1]; | |
88 | if (x & 0x8000) { | |
89 | x |= ~0xffff; | |
90 | } | |
91 | return x; | |
92 | } | |
93 | ||
94 | int FoFiBase::getU16BE(int pos, GBool *ok) { | |
95 | int x; | |
96 | ||
97 | if (pos < 0 || pos+1 >= len) { | |
98 | *ok = gFalse; | |
99 | return 0; | |
100 | } | |
101 | x = file[pos]; | |
102 | x = (x << 8) + file[pos+1]; | |
103 | return x; | |
104 | } | |
105 | ||
106 | int FoFiBase::getS32BE(int pos, GBool *ok) { | |
107 | int x; | |
108 | ||
109 | if (pos < 0 || pos+3 >= len) { | |
110 | *ok = gFalse; | |
111 | return 0; | |
112 | } | |
113 | x = file[pos]; | |
114 | x = (x << 8) + file[pos+1]; | |
115 | x = (x << 8) + file[pos+2]; | |
116 | x = (x << 8) + file[pos+3]; | |
117 | if (x & 0x80000000) { | |
118 | x |= ~0xffffffff; | |
119 | } | |
120 | return x; | |
121 | } | |
122 | ||
123 | Guint FoFiBase::getU32BE(int pos, GBool *ok) { | |
124 | Guint x; | |
125 | ||
126 | if (pos < 0 || pos+3 >= len) { | |
127 | *ok = gFalse; | |
128 | return 0; | |
129 | } | |
130 | x = file[pos]; | |
131 | x = (x << 8) + file[pos+1]; | |
132 | x = (x << 8) + file[pos+2]; | |
133 | x = (x << 8) + file[pos+3]; | |
134 | return x; | |
135 | } | |
136 | ||
137 | Guint FoFiBase::getUVarBE(int pos, int size, GBool *ok) { | |
138 | Guint x; | |
139 | int i; | |
140 | ||
141 | if (pos < 0 || pos + size > len) { | |
142 | *ok = gFalse; | |
143 | return 0; | |
144 | } | |
145 | x = 0; | |
146 | for (i = 0; i < size; ++i) { | |
147 | x = (x << 8) + file[pos + i]; | |
148 | } | |
149 | return x; | |
150 | } | |
151 | ||
152 | GBool FoFiBase::checkRegion(int pos, int size) { | |
153 | return pos >= 0 && | |
154 | pos + size >= pos && | |
155 | pos + size <= len; | |
156 | } |