pdf2swf/xpdf/Object.h

   1 //========================================================================
   2 //
   3 // Object.h
   4 //
   5 // Copyright 1996-2003 Glyph & Cog, LLC
   6 //
   7 //========================================================================
   8
   9 #ifndef OBJECT_H
  10 #define OBJECT_H
  11
  12 #include <aconf.h>
  13
  14 #ifdef USE_GCC_PRAGMAS
  15 #pragma interface
  16 #endif
  17
  18 #include <stdio.h>
  19 #include <string.h>
  20 #include "gtypes.h"
  21 #include "gmem.h"
  22 #include "GString.h"
  23
  24 class XRef;
  25 class Array;
  26 class Dict;
  27 class Stream;
  28
  29 //------------------------------------------------------------------------
  30 // Ref
  31 //------------------------------------------------------------------------
  32
  33 struct Ref {
  34   int num;                      // object number
  35   int gen;                      // generation number
  36 };
  37
  38 //------------------------------------------------------------------------
  39 // object types
  40 //------------------------------------------------------------------------
  41
  42 enum ObjType {
  43   // simple objects
  44   objBool,                      // boolean
  45   objInt,                       // integer
  46   objReal,                      // real
  47   objString,                    // string
  48   objName,                      // name
  49   objNull,                      // null
  50
  51   // complex objects
  52   objArray,                     // array
  53   objDict,                      // dictionary
  54   objStream,                    // stream
  55   objRef,                       // indirect reference
  56
  57   // special objects
  58   objCmd,                       // command name
  59   objError,                     // error return from Lexer
  60   objEOF,                       // end of file return from Lexer
  61   objNone                       // uninitialized object
  62 };
  63
  64 #define numObjTypes 14          // total number of object types
  65
  66 //------------------------------------------------------------------------
  67 // Object
  68 //------------------------------------------------------------------------
  69
  70 #ifdef DEBUG_MEM
  71 #define initObj(t) ++numAlloc[type = t]
  72 #else
  73 #define initObj(t) type = t
  74 #endif
  75
  76 class Object {
  77 public:
  78
  79   // Default constructor.
  80   Object():
  81     type(objNone) {}
  82
  83   // Initialize an object.
  84   Object *initBool(GBool boolnA)
  85     { initObj(objBool); booln = boolnA; return this; }
  86   Object *initInt(int intgA)
  87     { initObj(objInt); intg = intgA; return this; }
  88   Object *initReal(double realA)
  89     { initObj(objReal); real = realA; return this; }
  90   Object *initString(GString *stringA)
  91     { initObj(objString); string = stringA; return this; }
  92   Object *initName(char *nameA)
  93     { initObj(objName); name = copyString(nameA); return this; }
  94   Object *initNull()
  95     { initObj(objNull); return this; }
  96   Object *initArray(XRef *xref);
  97   Object *initDict(XRef *xref);
  98   Object *initDict(Dict *dictA);
  99   Object *initStream(Stream *streamA);
 100   Object *initRef(int numA, int genA)
 101     { initObj(objRef); ref.num = numA; ref.gen = genA; return this; }
 102   Object *initCmd(char *cmdA)
 103     { initObj(objCmd); cmd = copyString(cmdA); return this; }
 104   Object *initError()
 105     { initObj(objError); return this; }
 106   Object *initEOF()
 107     { initObj(objEOF); return this; }
 108
 109   // Copy an object.
 110   Object *copy(Object *obj);
 111
 112   // If object is a Ref, fetch and return the referenced object.
 113   // Otherwise, return a copy of the object.
 114   Object *fetch(XRef *xref, Object *obj);
 115
 116   // Free object contents.
 117   void free();
 118
 119   // Type checking.
 120   ObjType getType() { return type; }
 121   GBool isBool() { return type == objBool; }
 122   GBool isInt() { return type == objInt; }
 123   GBool isReal() { return type == objReal; }
 124   GBool isNum() { return type == objInt || type == objReal; }
 125   GBool isString() { return type == objString; }
 126   GBool isName() { return type == objName; }
 127   GBool isNull() { return type == objNull; }
 128   GBool isArray() { return type == objArray; }
 129   GBool isDict() { return type == objDict; }
 130   GBool isStream() { return type == objStream; }
 131   GBool isRef() { return type == objRef; }
 132   GBool isCmd() { return type == objCmd; }
 133   GBool isError() { return type == objError; }
 134   GBool isEOF() { return type == objEOF; }
 135   GBool isNone() { return type == objNone; }
 136
 137   // Special type checking.
 138   GBool isName(char *nameA)
 139     { return type == objName && !strcmp(name, nameA); }
 140   GBool isDict(char *dictType);
 141   GBool isStream(char *dictType);
 142   GBool isCmd(char *cmdA)
 143     { return type == objCmd && !strcmp(cmd, cmdA); }
 144
 145   // Accessors.  NB: these assume object is of correct type.
 146   GBool getBool() { return booln; }
 147   int getInt() { return intg; }
 148   double getReal() { return real; }
 149   double getNum() { return type == objInt ? (double)intg : real; }
 150   GString *getString() { return string; }
 151   char *getName() { return name; }
 152   Array *getArray() { return array; }
 153   Dict *getDict() { return dict; }
 154   Stream *getStream() { return stream; }
 155   Ref getRef() { return ref; }
 156   int getRefNum() { return ref.num; }
 157   int getRefGen() { return ref.gen; }
 158   char *getCmd() { return cmd; }
 159
 160   // Array accessors.
 161   int arrayGetLength();
 162   void arrayAdd(Object *elem);
 163   Object *arrayGet(int i, Object *obj);
 164   Object *arrayGetNF(int i, Object *obj);
 165
 166   // Dict accessors.
 167   int dictGetLength();
 168   void dictAdd(char *key, Object *val);
 169   GBool dictIs(char *dictType);
 170   Object *dictLookup(char *key, Object *obj);
 171   Object *dictLookupNF(char *key, Object *obj);
 172   char *dictGetKey(int i);
 173   Object *dictGetVal(int i, Object *obj);
 174   Object *dictGetValNF(int i, Object *obj);
 175
 176   // Stream accessors.
 177   GBool streamIs(char *dictType);
 178   void streamReset();
 179   void streamClose();
 180   int streamGetChar();
 181   int streamLookChar();
 182   char *streamGetLine(char *buf, int size);
 183   Guint streamGetPos();
 184   void streamSetPos(Guint pos, int dir = 0);
 185   Dict *streamGetDict();
 186
 187   // Output.
 188   char *getTypeName();
 189   void print(FILE *f = stdout);
 190
 191   // Memory testing.
 192   static void memCheck(FILE *f);
 193
 194 private:
 195
 196   ObjType type;                 // object type
 197   union {                       // value for each type:
 198     GBool booln;                //   boolean
 199     int intg;                   //   integer
 200     double real;                //   real
 201     GString *string;            //   string
 202     char *name;                 //   name
 203     Array *array;               //   array
 204     Dict *dict;                 //   dictionary
 205     Stream *stream;             //   stream
 206     Ref ref;                    //   indirect reference
 207     char *cmd;                  //   command
 208   };
 209
 210 #ifdef DEBUG_MEM
 211   static int                    // number of each type of object
 212     numAlloc[numObjTypes];      //   currently allocated
 213 #endif
 214 };
 215
 216 //------------------------------------------------------------------------
 217 // Array accessors.
 218 //------------------------------------------------------------------------
 219
 220 #include "Array.h"
 221
 222 inline int Object::arrayGetLength()
 223   { return array->getLength(); }
 224
 225 inline void Object::arrayAdd(Object *elem)
 226   { array->add(elem); }
 227
 228 inline Object *Object::arrayGet(int i, Object *obj)
 229   { return array->get(i, obj); }
 230
 231 inline Object *Object::arrayGetNF(int i, Object *obj)
 232   { return array->getNF(i, obj); }
 233
 234 //------------------------------------------------------------------------
 235 // Dict accessors.
 236 //------------------------------------------------------------------------
 237
 238 #include "Dict.h"
 239
 240 inline int Object::dictGetLength()
 241   { return dict->getLength(); }
 242
 243 inline void Object::dictAdd(char *key, Object *val)
 244   { dict->add(key, val); }
 245
 246 inline GBool Object::dictIs(char *dictType)
 247   { return dict->is(dictType); }
 248
 249 inline GBool Object::isDict(char *dictType)
 250   { return type == objDict && dictIs(dictType); }
 251
 252 inline Object *Object::dictLookup(char *key, Object *obj)
 253   { return dict->lookup(key, obj); }
 254
 255 inline Object *Object::dictLookupNF(char *key, Object *obj)
 256   { return dict->lookupNF(key, obj); }
 257
 258 inline char *Object::dictGetKey(int i)
 259   { return dict->getKey(i); }
 260
 261 inline Object *Object::dictGetVal(int i, Object *obj)
 262   { return dict->getVal(i, obj); }
 263
 264 inline Object *Object::dictGetValNF(int i, Object *obj)
 265   { return dict->getValNF(i, obj); }
 266
 267 //------------------------------------------------------------------------
 268 // Stream accessors.
 269 //------------------------------------------------------------------------
 270
 271 #include "Stream.h"
 272
 273 inline GBool Object::streamIs(char *dictType)
 274   { return stream->getDict()->is(dictType); }
 275
 276 inline GBool Object::isStream(char *dictType)
 277   { return type == objStream && streamIs(dictType); }
 278
 279 inline void Object::streamReset()
 280   { stream->reset(); }
 281
 282 inline void Object::streamClose()
 283   { stream->close(); }
 284
 285 inline int Object::streamGetChar()
 286   { return stream->getChar(); }
 287
 288 inline int Object::streamLookChar()
 289   { return stream->lookChar(); }
 290
 291 inline char *Object::streamGetLine(char *buf, int size)
 292   { return stream->getLine(buf, size); }
 293
 294 inline Guint Object::streamGetPos()
 295   { return stream->getPos(); }
 296
 297 inline void Object::streamSetPos(Guint pos, int dir)
 298   { stream->setPos(pos, dir); }
 299
 300 inline Dict *Object::streamGetDict()
 301   { return stream->getDict(); }
 302
 303 #endif