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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPdfNativeDoc_DEFINED
#define SkPdfNativeDoc_DEFINED
#include "SkRect.h"
#include "SkTDArray.h"
class SkCanvas;
class SkPdfAllocator;
class SkPdfMapper;
class SkPdfNativeObject;
class SkPdfReal;
class SkPdfInteger;
class SkPdfString;
class SkPdfResourceDictionary;
class SkPdfCatalogDictionary;
class SkPdfPageObjectDictionary;
class SkPdfPageTreeNodeDictionary;
class SkPdfNativeTokenizer;
class SkStream;
class SkPdfNativeDoc {
private:
struct PublicObjectEntry {
long fOffset;
// long endOffset; // TODO(edisonn): determine the end of the object, to be used when the doc is corrupted
SkPdfNativeObject* fObj;
// TODO(edisonn): perf ... probably it does not make sense to cache the ref. test it!
SkPdfNativeObject* fResolvedReference;
bool fIsReferenceResolved;
};
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
SkPdfNativeDoc(const char* path);
SkPdfNativeDoc(SkStream* stream);
~SkPdfNativeDoc();
int pages() const;
SkPdfResourceDictionary* pageResources(int page);
SkRect MediaBox(int page);
SkPdfNativeTokenizer* tokenizerOfPage(int n, SkPdfAllocator* allocator);
SkPdfNativeTokenizer* tokenizerOfStream(SkPdfNativeObject* stream, SkPdfAllocator* allocator);
SkPdfNativeTokenizer* tokenizerOfBuffer(const unsigned char* buffer, size_t len,
SkPdfAllocator* allocator);
size_t objects() const;
SkPdfNativeObject* object(int i);
SkPdfPageObjectDictionary* page(int page);
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(const unsigned char* sz, size_t len) const;
SkPdfNativeObject* resolveReference(SkPdfNativeObject* ref);
// Reports an approximation of all the memory usage.
size_t bytesUsed() const;
private:
// Takes ownership of bytes.
void init(const void* bytes, size_t length);
void loadWithoutXRef();
const unsigned char* readCrossReferenceSection(const unsigned char* xrefStart, const unsigned char* trailerEnd);
const unsigned char* readTrailer(const unsigned char* trailerStart, const unsigned char* trailerEnd, bool storeCatalog, long* prev, bool skipKeyword);
// 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;
obj->fIsReferenceResolved = false;
}
SkPdfNativeObject* readObject(int id/*, int generation*/);
void fillPages(SkPdfPageTreeNodeDictionary* tree);
// private fields
SkPdfAllocator* fAllocator;
SkPdfMapper* fMapper;
const unsigned char* fFileContent;
size_t fContentLength;
SkPdfNativeObject* fRootCatalogRef;
SkPdfCatalogDictionary* fRootCatalog;
mutable SkTDArray<PublicObjectEntry> fObjects;
SkTDArray<SkPdfPageObjectDictionary*> fPages;
};
#endif // SkPdfNativeDoc_DEFINED
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