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#ifndef EXPERIMENTAL_PDFVIEWER_PDFPARSER_NATIVE_SKNATIVEPARSEDPDF_H_
#define EXPERIMENTAL_PDFVIEWER_PDFPARSER_NATIVE_SKNATIVEPARSEDPDF_H_
#include "SkRect.h"
#include "SkTDArray.h"
class SkCanvas;
class SkPdfAllocator;
class SkPdfMapper;
class SkPdfObject;
class SkPdfReal;
class SkPdfInteger;
class SkPdfString;
class SkPdfResourceDictionary;
class SkPdfCatalogDictionary;
class SkPdfPageObjectDictionary;
class SkPdfPageTreeNodeDictionary;
class SkPdfNativeTokenizer;
class SkNativeParsedPDF {
private:
struct PublicObjectEntry {
long fOffset;
// long endOffset; // TODO(edisonn): determine the end of the object, to be used when the doc is corrupted
SkPdfObject* fObj;
// TODO(edisonn): perf ... probably it does not make sense to cache the ref. test it!
SkPdfObject* fResolvedReference;
};
public:
// TODO(edisonn): read methods: file, stream, http(s)://url, url with seek?
// TODO(edisonn): read first page asap, linearized
// TODO(edisonn): read page N asap, read all file
// TODO(edisonn): allow corruptions of file (e.g. missing endobj, missing stream length, ...)
// TODO(edisonn): encryption
SkNativeParsedPDF(const char* path);
~SkNativeParsedPDF();
int pages() const;
SkPdfResourceDictionary* pageResources(int page);
SkRect MediaBox(int page);
SkPdfNativeTokenizer* tokenizerOfPage(int n);
SkPdfNativeTokenizer* tokenizerOfStream(SkPdfObject* stream);
SkPdfNativeTokenizer* tokenizerOfBuffer(unsigned char* buffer, size_t len);
size_t objects() const;
SkPdfObject* object(int i);
const SkPdfMapper* mapper() const;
SkPdfAllocator* allocator() const;
SkPdfReal* createReal(double value) const;
SkPdfInteger* createInteger(int value) const;
// the string does not own the char*
SkPdfString* createString(unsigned char* sz, size_t len) const;
void drawPage(int page, SkCanvas* canvas);
SkPdfObject* resolveReference(const SkPdfObject* ref);
private:
unsigned char* readCrossReferenceSection(unsigned char* xrefStart, unsigned char* trailerEnd);
long readTrailer(unsigned char* trailerStart, unsigned char* trailerEnd, bool storeCatalog);
// TODO(edisonn): updates not supported right now, generation ignored
void addCrossSectionInfo(int id, int generation, int offset, bool isFreed);
static void reset(PublicObjectEntry* obj) {
obj->fObj = NULL;
obj->fResolvedReference = NULL;
obj->fOffset = -1;
}
SkPdfObject* readObject(int id/*, int generation*/);
void fillPages(SkPdfPageTreeNodeDictionary* tree);
// private fields
SkPdfAllocator* fAllocator;
SkPdfMapper* fMapper;
unsigned char* fFileContent;
size_t fContentLength;
const SkPdfObject* fRootCatalogRef;
SkPdfCatalogDictionary* fRootCatalog;
mutable SkTDArray<PublicObjectEntry> fObjects;
SkTDArray<SkPdfPageObjectDictionary*> fPages;
};
#endif // EXPERIMENTAL_PDFVIEWER_PDFPARSER_NATIVE_SKNATIVEPARSEDPDF_H_
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