CharCodeToUnicode.h

//========================================================================
//
// CharCodeToUnicode.h
//
// Mapping from character codes to Unicode.
//
// Copyright 2001-2002 Glyph & Cog, LLC
//
//========================================================================
 
#ifndef CHARCODETOUNICODE_H
#define CHARCODETOUNICODE_H
 
#include <aconf.h>
 
#ifdef USE_GCC_PRAGMAS
#pragma interface
#endif
 
#include "CharTypes.h"
 
struct CharCodeToUnicodeString;
 
//------------------------------------------------------------------------
 
class CharCodeToUnicode {
public:
 
  // Create the CID-to-Unicode mapping specified by <collection>.
  // This reads a .cidToUnicode file from disk.  Sets the initial
  // reference count to 1.  Returns NULL on failure.
  static CharCodeToUnicode *parseCIDToUnicode(GString *collectionA);
 
  // Create the CharCode-to-Unicode mapping for an 8-bit font.
  // <toUnicode> is an array of 256 Unicode indexes.  Sets the initial
  // reference count to 1.
  static CharCodeToUnicode *make8BitToUnicode(Unicode *toUnicode);
 
  // Parse a ToUnicode CMap for an 8- or 16-bit font.
  static CharCodeToUnicode *parseCMap(GString *buf, int nBits);
 
  ~CharCodeToUnicode();
 
  void incRefCnt();
  void decRefCnt();
 
  // Return true if this mapping matches the specified <collectionA>.
  GBool match(GString *collectionA);
 
  // Map a CharCode to Unicode.
  int mapToUnicode(CharCode c, Unicode *u, int size);
 
private:
 
  void parseCMap1(int (*getCharFunc)(void *), void *data, int nBits);
  CharCodeToUnicode(GString *collectionA);
  CharCodeToUnicode(GString *collectionA, Unicode *mapA,
            CharCode mapLenA, GBool copyMap,
            CharCodeToUnicodeString *sMapA, int sMapLenA);
 
  GString *collection;
  Unicode *map;
  CharCode mapLen;
  CharCodeToUnicodeString *sMap;
  int sMapLen, sMapSize;
  int refCnt;
};
 
//------------------------------------------------------------------------
 
#define cidToUnicodeCacheSize 4
 
class CIDToUnicodeCache {
public:
 
  CIDToUnicodeCache();
  ~CIDToUnicodeCache();
 
  // Get the CharCodeToUnicode object for <collection>.  Increments
  // its reference count; there will be one reference for the cache
  // plus one for the caller of this function.  Returns NULL on
  // failure.
  CharCodeToUnicode *getCIDToUnicode(GString *collection);
 
private:
 
  CharCodeToUnicode *cache[cidToUnicodeCacheSize];
};
 
#endif