pdftops/CharCodeToUnicode.h

   1 //========================================================================
   2 //
   3 // CharCodeToUnicode.h
   4 //
   5 // Mapping from character codes to Unicode.
   6 //
   7 // Copyright 2001-2003 Glyph & Cog, LLC
   8 //
   9 //========================================================================
  10
  11 #ifndef CHARCODETOUNICODE_H
  12 #define CHARCODETOUNICODE_H
  13
  14 #include <config.h>
  15
  16 #ifdef USE_GCC_PRAGMAS
  17 #pragma interface
  18 #endif
  19
  20 #include "CharTypes.h"
  21
  22 #if MULTITHREADED
  23 #include "GMutex.h"
  24 #endif
  25
  26 struct CharCodeToUnicodeString;
  27
  28 //------------------------------------------------------------------------
  29
  30 class CharCodeToUnicode {
  31 public:
  32
  33   // Read the CID-to-Unicode mapping for <collection> from the file
  34   // specified by <fileName>.  Sets the initial reference count to 1.
  35   // Returns NULL on failure.
  36   static CharCodeToUnicode *parseCIDToUnicode(GString *fileName,
  37                                               GString *collection);
  38
  39   // Create a Unicode-to-Unicode mapping from the file specified by
  40   // <fileName>.  Sets the initial reference count to 1.  Returns NULL
  41   // on failure.
  42   static CharCodeToUnicode *parseUnicodeToUnicode(GString *fileName);
  43
  44   // Create the CharCode-to-Unicode mapping for an 8-bit font.
  45   // <toUnicode> is an array of 256 Unicode indexes.  Sets the initial
  46   // reference count to 1.
  47   static CharCodeToUnicode *make8BitToUnicode(Unicode *toUnicode);
  48
  49   // Parse a ToUnicode CMap for an 8- or 16-bit font.
  50   static CharCodeToUnicode *parseCMap(GString *buf, int nBits);
  51
  52   // Parse a ToUnicode CMap for an 8- or 16-bit font, merging it into
  53   // <this>.
  54   void mergeCMap(GString *buf, int nBits);
  55
  56   ~CharCodeToUnicode();
  57
  58   void incRefCnt();
  59   void decRefCnt();
  60
  61   // Return true if this mapping matches the specified <tagA>.
  62   GBool match(GString *tagA);
  63
  64   // Set the mapping for <c>.
  65   void setMapping(CharCode c, Unicode *u, int len);
  66
  67   // Map a CharCode to Unicode.
  68   int mapToUnicode(CharCode c, Unicode *u, int size);
  69
  70   // Return the mapping's length, i.e., one more than the max char
  71   // code supported by the mapping.
  72   CharCode getLength() { return mapLen; }
  73
  74 private:
  75
  76   void parseCMap1(int (*getCharFunc)(void *), void *data, int nBits);
  77   void addMapping(CharCode code, char *uStr, int n, int offset);
  78   CharCodeToUnicode(GString *tagA);
  79   CharCodeToUnicode(GString *tagA, Unicode *mapA,
  80                     CharCode mapLenA, GBool copyMap,
  81                     CharCodeToUnicodeString *sMapA,
  82                     int sMapLenA, int sMapSizeA);
  83
  84   GString *tag;
  85   Unicode *map;
  86   CharCode mapLen;
  87   CharCodeToUnicodeString *sMap;
  88   int sMapLen, sMapSize;
  89   int refCnt;
  90 #if MULTITHREADED
  91   GMutex mutex;
  92 #endif
  93 };
  94
  95 //------------------------------------------------------------------------
  96
  97 class CharCodeToUnicodeCache {
  98 public:
  99
 100   CharCodeToUnicodeCache(int sizeA);
 101   ~CharCodeToUnicodeCache();
 102
 103   // Get the CharCodeToUnicode object for <tag>.  Increments its
 104   // reference count; there will be one reference for the cache plus
 105   // one for the caller of this function.  Returns NULL on failure.
 106   CharCodeToUnicode *getCharCodeToUnicode(GString *tag);
 107
 108   // Insert <ctu> into the cache, in the most-recently-used position.
 109   void add(CharCodeToUnicode *ctu);
 110
 111 private:
 112
 113   CharCodeToUnicode **cache;
 114   int size;
 115 };
 116
 117 #endif