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#include "SkPdfObject.h"
#include "SkPdfStreamCommonDictionary_autogen.h"
#include "SkFlate.h"
#include "SkStream.h"
#include "SkPdfNativeTokenizer.h"
SkPdfObject SkPdfObject::kNull = SkPdfObject::makeNull();
bool SkPdfObject::applyFlateDecodeFilter() {
if (!SkFlate::HaveFlate()) {
// TODO(edisonn): warn, make callers handle it
return false;
}
const unsigned char* old = fStr.fBuffer;
bool deleteOld = isStreamOwned();
SkMemoryStream skstream(fStr.fBuffer, fStr.fBytes >> 2, false);
SkDynamicMemoryWStream uncompressedData;
if (SkFlate::Inflate(&skstream, &uncompressedData)) {
fStr.fBytes = (uncompressedData.bytesWritten() << 2) + kOwnedStreamBit + kUnfilteredStreamBit;
fStr.fBuffer = (const unsigned char*)new unsigned char[uncompressedData.bytesWritten()];
uncompressedData.copyTo((void*)fStr.fBuffer);
if (deleteOld) {
delete[] old;
}
return true;
} else {
// TODO(edisonn): warn, make callers handle it
return false;
}
}
bool SkPdfObject::applyDCTDecodeFilter() {
// this would fail, and it won't allow any more filters.
// technically, it would be possible, but not a real world scenario
// TODO(edisonn): or get the image here and store it for fast retrieval?
return false;
}
bool SkPdfObject::applyFilter(const char* name) {
if (strcmp(name, "FlateDecode") == 0) {
return applyFlateDecodeFilter();
} else if (strcmp(name, "DCTDecode") == 0) {
return applyDCTDecodeFilter();
}
// TODO(edisonn): allert, not supported, but should be implemented asap
return false;
}
bool SkPdfObject::filterStream() {
if (!hasStream()) {
return false;
}
if (isStreamFiltered()) {
return true;
}
SkPdfStreamCommonDictionary* stream = (SkPdfStreamCommonDictionary*)this;
if (!stream->has_Filter()) {
fStr.fBytes = ((fStr.fBytes >> 1) << 1) + kFilteredStreamBit;
} else if (stream->isFilterAName(NULL)) {
std::string filterName = stream->getFilterAsName(NULL);
applyFilter(filterName.c_str());
} else if (stream->isFilterAArray(NULL)) {
const SkPdfArray* filters = stream->getFilterAsArray(NULL);
int cnt = filters->size();
for (int i = cnt - 1; i >= 0; i--) {
const SkPdfObject* filterName = filters->objAtAIndex(i);
if (filterName != NULL && filterName->isName()) {
if (!applyFilter(filterName->nameValue())) {
break;
}
} else {
// TODO(edisonn): report warning
}
}
}
return true;
}
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