source/libs/poppler/poppler-src/fofi/FoFiBase.cc

   1 //========================================================================
   2 //
   3 // FoFiBase.cc
   4 //
   5 // Copyright 1999-2003 Glyph & Cog, LLC
   6 //
   7 //========================================================================
   8
   9 //========================================================================
  10 //
  11 // Modified under the Poppler project - http://poppler.freedesktop.org
  12 //
  13 // All changes made under the Poppler project to this file are licensed
  14 // under GPL version 2 or later
  15 //
  16 // Copyright (C) 2008 Ed Avis <eda@waniasset.com>
  17 // Copyright (C) 2011 Jim Meyering <jim@meyering.net>
  18 //
  19 // To see a description of the changes please see the Changelog file that
  20 // came with your tarball or type make ChangeLog if you are building from git
  21 //
  22 //========================================================================
  23
  24 #include <config.h>
  25
  26 #ifdef USE_GCC_PRAGMAS
  27 #pragma implementation
  28 #endif
  29
  30 #include <stdio.h>
  31 #include <limits.h>
  32 #include "goo/gmem.h"
  33 #include "poppler/Error.h"
  34 #include "FoFiBase.h"
  35
  36 //------------------------------------------------------------------------
  37 // FoFiBase
  38 //------------------------------------------------------------------------
  39
  40 FoFiBase::FoFiBase(char *fileA, int lenA, GBool freeFileDataA) {
  41   fileData = file = (Guchar *)fileA;
  42   len = lenA;
  43   freeFileData = freeFileDataA;
  44 }
  45
  46 FoFiBase::~FoFiBase() {
  47   if (freeFileData) {
  48     gfree(fileData);
  49   }
  50 }
  51
  52 char *FoFiBase::readFile(char *fileName, int *fileLen) {
  53   FILE *f;
  54   char *buf;
  55   int n;
  56
  57   if (!(f = fopen(fileName, "rb"))) {
  58     error(errIO, -1, "Cannot open '{0:s}'", fileName);
  59     return NULL;
  60   }
  61   if (fseek(f, 0, SEEK_END) != 0) {
  62     error(errIO, -1, "Cannot seek to end of '{0:s}'", fileName);
  63     fclose(f);
  64     return NULL;
  65   }
  66   n = (int)ftell(f);
  67   if (n < 0) {
  68     error(errIO, -1, "Cannot determine length of '{0:s}'", fileName);
  69     fclose(f);
  70     return NULL;
  71   }
  72   if (fseek(f, 0, SEEK_SET) != 0) {
  73     error(errIO, -1, "Cannot seek to start of '{0:s}'", fileName);
  74     fclose(f);
  75     return NULL;
  76   }
  77   buf = (char *)gmalloc(n);
  78   if ((int)fread(buf, 1, n, f) != n) {
  79     gfree(buf);
  80     fclose(f);
  81     return NULL;
  82   }
  83   fclose(f);
  84   *fileLen = n;
  85   return buf;
  86 }
  87
  88 int FoFiBase::getS8(int pos, GBool *ok) {
  89   int x;
  90
  91   if (pos < 0 || pos >= len) {
  92     *ok = gFalse;
  93     return 0;
  94   }
  95   x = file[pos];
  96   if (x & 0x80) {
  97     x |= ~0xff;
  98   }
  99   return x;
 100 }
 101
 102 int FoFiBase::getU8(int pos, GBool *ok) {
 103   if (pos < 0 || pos >= len) {
 104     *ok = gFalse;
 105     return 0;
 106   }
 107   return file[pos];
 108 }
 109
 110 int FoFiBase::getS16BE(int pos, GBool *ok) {
 111   int x;
 112
 113   if (pos < 0 || pos+1 >= len || pos > INT_MAX - 1) {
 114     *ok = gFalse;
 115     return 0;
 116   }
 117   x = file[pos];
 118   x = (x << 8) + file[pos+1];
 119   if (x & 0x8000) {
 120     x |= ~0xffff;
 121   }
 122   return x;
 123 }
 124
 125 int FoFiBase::getU16BE(int pos, GBool *ok) {
 126   int x;
 127
 128   if (pos < 0 || pos+1 >= len || pos > INT_MAX - 1) {
 129     *ok = gFalse;
 130     return 0;
 131   }
 132   x = file[pos];
 133   x = (x << 8) + file[pos+1];
 134   return x;
 135 }
 136
 137 int FoFiBase::getS32BE(int pos, GBool *ok) {
 138   int x;
 139
 140   if (pos < 0 || pos+3 >= len || pos > INT_MAX - 3) {
 141     *ok = gFalse;
 142     return 0;
 143   }
 144   x = file[pos];
 145   x = (x << 8) + file[pos+1];
 146   x = (x << 8) + file[pos+2];
 147   x = (x << 8) + file[pos+3];
 148   if (x & 0x80000000) {
 149     x |= ~0xffffffff;
 150   }
 151   return x;
 152 }
 153
 154 Guint FoFiBase::getU32BE(int pos, GBool *ok) {
 155   Guint x;
 156
 157   if (pos < 0 || pos+3 >= len || pos > INT_MAX - 3) {
 158     *ok = gFalse;
 159     return 0;
 160   }
 161   x = file[pos];
 162   x = (x << 8) + file[pos+1];
 163   x = (x << 8) + file[pos+2];
 164   x = (x << 8) + file[pos+3];
 165   return x;
 166 }
 167
 168 Guint FoFiBase::getU32LE(int pos, GBool *ok) {
 169   Guint x;
 170
 171   if (pos < 0 || pos+3 >= len || pos > INT_MAX - 3) {
 172     *ok = gFalse;
 173     return 0;
 174   }
 175   x = file[pos+3];
 176   x = (x << 8) + file[pos+2];
 177   x = (x << 8) + file[pos+1];
 178   x = (x << 8) + file[pos];
 179   return x;
 180 }
 181
 182 Guint FoFiBase::getUVarBE(int pos, int size, GBool *ok) {
 183   Guint x;
 184   int i;
 185
 186   if (pos < 0 || pos + size > len || pos > INT_MAX - size) {
 187     *ok = gFalse;
 188     return 0;
 189   }
 190   x = 0;
 191   for (i = 0; i < size; ++i) {
 192     x = (x << 8) + file[pos + i];
 193   }
 194   return x;
 195 }
 196
 197 GBool FoFiBase::checkRegion(int pos, int size) {
 198   return pos >= 0 &&
 199          pos + size >= pos &&
 200          pos + size <= len;
 201 }