pdftops/FoFiBase.cxx

   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 }