(upload draf code for backup) pdfviewer: improve memory, son't allocate extra buffers, and put the …

experimental/PdfViewer/pdfparser/native/SkPdfNativeTokenizer.h

 #ifndef EXPERIMENTAL_PDFVIEWER_PDFPARSER_NATIVE_SKPDFNATIVETOKENIZER_H_
 #define EXPERIMENTAL_PDFVIEWER_PDFPARSER_NATIVE_SKPDFNATIVETOKENIZER_H_
 
 #include "SkTDArray.h"
 #include "SkTDict.h"
 #include <math.h>
 #include <string.h>
 
 class SkPdfMapper;
 class SkPdfDictionary;
@@ skipping 44 matching lines @@
                             ((ch)==kOpenedCurlyBracket_PdfDelimiter)||\
                             ((ch)==kClosedCurlyBracket_PdfDelimiter)||\
                             ((ch)==kNamed_PdfDelimiter)||\
                             ((ch)==kComment_PdfDelimiter))
 
 #define isPdfWhiteSpaceOrPdfDelimiter(ch) (isPdfWhiteSpace(ch)||isPdfDelimiter(ch))
 
 #define isPdfDigit(ch) ((ch)>='0'&&(ch)<='9')
 #define isPdfNumeric(ch) (isPdfDigit(ch)||(ch)=='+'||(ch)=='-')
 
-unsigned char* skipPdfWhiteSpaces(unsigned char* buffer, size_t len);
-unsigned char* endOfPdfToken(unsigned char* start, size_t len);
-unsigned char* skipPdfComment(unsigned char* start, size_t len);
+const unsigned char* skipPdfWhiteSpaces(int level, const unsigned char* buffer, size_t len);
+const unsigned char* endOfPdfToken(int level, const unsigned char* start, size_t len);
+const unsigned char* skipPdfComment(int level, const unsigned char* start, size_t len);
 
 // TODO(edisonn): typedef read and integer tyepes? make less readable...
 //typedef double SkPdfReal;
 //typedef int64_t SkPdfInteger;
 
 // an allocator only allocates memory, and it deletes it all when the allocator is destroyed
 // this would allow us not to do any garbage collection while we parse or draw a pdf, and defere it
 // while the user is looking at the image
 
 class SkPdfObject;
@@ skipping 26 matching lines @@
         fSizeInBytes += bytes;
         return data;
     }
 
     size_t bytesUsed() const {
         return fSizeInBytes;
     }
 };
 
 class SkNativeParsedPDF;
-unsigned char* nextObject(unsigned char* start, unsigned char* end, SkPdfObject* token, SkPdfAllocator* allocator, SkNativeParsedPDF* doc);
+const unsigned char* nextObject(int level, const unsigned char* start, const unsigned char* end, SkPdfObject* token, SkPdfAllocator* allocator, SkNativeParsedPDF* doc);
 
 enum SkPdfTokenType {
     kKeyword_TokenType,
     kObject_TokenType,
 };
 
 struct PdfToken {
     const char*      fKeyword;
     size_t           fKeywordLength;
     SkPdfObject*     fObject;
     SkPdfTokenType   fType;
 
     PdfToken() : fKeyword(NULL), fKeywordLength(0), fObject(NULL) {}
 };
 
 class SkPdfNativeTokenizer {
 public:
     SkPdfNativeTokenizer(SkPdfObject* objWithStream, const SkPdfMapper* mapper, SkPdfAllocator* allocator, SkNativeParsedPDF* doc);
-    SkPdfNativeTokenizer(unsigned char* buffer, int len, const SkPdfMapper* mapper, SkPdfAllocator* allocator, SkNativeParsedPDF* doc);
+    SkPdfNativeTokenizer(const unsigned char* buffer, int len, const SkPdfMapper* mapper, SkPdfAllocator* allocator, SkNativeParsedPDF* doc);
 
     virtual ~SkPdfNativeTokenizer();
 
     bool readToken(PdfToken* token);
     bool readTokenCore(PdfToken* token);
     void PutBack(PdfToken token);
     SkPdfImageDictionary* readInlineImage();
 
 private:
     SkNativeParsedPDF* fDoc;
     const SkPdfMapper* fMapper;
     SkPdfAllocator* fAllocator;
 
-    unsigned char* fUncompressedStreamStart;
-    unsigned char* fUncompressedStream;
-    unsigned char* fUncompressedStreamEnd;
+    const unsigned char* fUncompressedStreamStart;
+    const unsigned char* fUncompressedStream;
+    const unsigned char* fUncompressedStreamEnd;
 
     bool fEmpty;
     bool fHasPutBack;
     PdfToken fPutBack;
 };
 
 #endif  // EXPERIMENTAL_PDFVIEWER_PDFPARSER_NATIVE_SKPDFNATIVETOKENIZER_H_