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

experimental/PdfViewer/SkPdfConfig.h

 #ifndef __DEFINED__SkPdfConfig
 #define __DEFINED__SkPdfConfig
 
 //#define PDF_TRACE
+//#define PDF_TRACE_READ_TOKEN
 //#define PDF_TRACE_DIFF_IN_PNG
 //#define PDF_DEBUG_NO_CLIPING
 //#define PDF_DEBUG_NO_PAGE_CLIPING
 //#define PDF_DEBUG_3X
 
 // TODO(edisonn): move in trace util.
 #ifdef PDF_TRACE
 void SkTraceMatrix(const SkMatrix& matrix, const char* sz);
 void SkTraceRect(const SkRect& rect, const char* sz);
 #else
 #define SkTraceMatrix(a,b)
 #define SkTraceRect(a,b)
 #endif
 
+struct NotOwnedString {
+    const unsigned char* fBuffer;
+    size_t fBytes;
+
+    static void init(NotOwnedString* str) {
+        str->fBuffer = NULL;
+        str->fBytes = 0;
+    }
+
+    static void init(NotOwnedString* str, const char* sz) {
+        str->fBuffer = (const unsigned char*)sz;
+        str->fBytes = strlen(sz);
+    }
+
+    bool equals(const char* sz) {
+        return strncmp((const char*)fBuffer, sz, fBytes) == 0 && fBytes == strlen(sz);
+
+    }
+};
+
 #endif  // __DEFINED__SkPdfConfig