pdftops/UnicodeMap.h

   1 //========================================================================
   2 //
   3 // UnicodeMap.h
   4 //
   5 // Mapping from Unicode to an encoding.
   6 //
   7 // Copyright 2001-2003 Glyph & Cog, LLC
   8 //
   9 //========================================================================
  10
  11 #ifndef UNICODEMAP_H
  12 #define UNICODEMAP_H
  13
  14 #include <config.h>
  15
  16 #ifdef USE_GCC_PRAGMAS
  17 #pragma interface
  18 #endif
  19
  20 #include "gtypes.h"
  21 #include "CharTypes.h"
  22
  23 #if MULTITHREADED
  24 #include "GMutex.h"
  25 #endif
  26
  27 class GString;
  28
  29 //------------------------------------------------------------------------
  30
  31 enum UnicodeMapKind {
  32   unicodeMapUser,               // read from a file
  33   unicodeMapResident,           // static list of ranges
  34   unicodeMapFunc                // function pointer
  35 };
  36
  37 typedef int (*UnicodeMapFunc)(Unicode u, char *buf, int bufSize);
  38
  39 struct UnicodeMapRange {
  40   Unicode start, end;           // range of Unicode chars
  41   Guint code, nBytes;           // first output code
  42 };
  43
  44 struct UnicodeMapExt;
  45
  46 //------------------------------------------------------------------------
  47
  48 class UnicodeMap {
  49 public:
  50
  51   // Create the UnicodeMap specified by <encodingName>.  Sets the
  52   // initial reference count to 1.  Returns NULL on failure.
  53   static UnicodeMap *parse(GString *encodingNameA);
  54
  55   // Create a resident UnicodeMap.
  56   UnicodeMap(char *encodingNameA, GBool unicodeOutA,
  57              UnicodeMapRange *rangesA, int lenA);
  58
  59   // Create a resident UnicodeMap that uses a function instead of a
  60   // list of ranges.
  61   UnicodeMap(char *encodingNameA, GBool unicodeOutA,
  62              UnicodeMapFunc funcA);
  63
  64   ~UnicodeMap();
  65
  66   void incRefCnt();
  67   void decRefCnt();
  68
  69   GString *getEncodingName() { return encodingName; }
  70
  71   GBool isUnicode() { return unicodeOut; }
  72
  73   // Return true if this UnicodeMap matches the specified
  74   // <encodingNameA>.
  75   GBool match(GString *encodingNameA);
  76
  77   // Map Unicode to the target encoding.  Fills in <buf> with the
  78   // output and returns the number of bytes used.  Output will be
  79   // truncated at <bufSize> bytes.  No string terminator is written.
  80   // Returns 0 if no mapping is found.
  81   int mapUnicode(Unicode u, char *buf, int bufSize);
  82
  83 private:
  84
  85   UnicodeMap(GString *encodingNameA);
  86
  87   GString *encodingName;
  88   UnicodeMapKind kind;
  89   GBool unicodeOut;
  90   union {
  91     UnicodeMapRange *ranges;    // (user, resident)
  92     UnicodeMapFunc func;        // (func)
  93   };
  94   int len;                      // (user, resident)
  95   UnicodeMapExt *eMaps;         // (user)
  96   int eMapsLen;                 // (user)
  97   int refCnt;
  98 #if MULTITHREADED
  99   GMutex mutex;
 100 #endif
 101 };
 102
 103 //------------------------------------------------------------------------
 104
 105 #define unicodeMapCacheSize 4
 106
 107 class UnicodeMapCache {
 108 public:
 109
 110   UnicodeMapCache();
 111   ~UnicodeMapCache();
 112
 113   // Get the UnicodeMap for <encodingName>.  Increments its reference
 114   // count; there will be one reference for the cache plus one for the
 115   // caller of this function.  Returns NULL on failure.
 116   UnicodeMap *getUnicodeMap(GString *encodingName);
 117
 118 private:
 119
 120   UnicodeMap *cache[unicodeMapCacheSize];
 121 };
 122
 123 #endif