Native PDF parser implementation - don't try it on pdfs that are not generated by skia, Crome Print Preview or Chrome Save As Pdf - it will crash as mising xref, pdfs with updates, and other features are not supported yer.
Review URL: https://codereview.chromium.org/18323019
git-svn-id: http://skia.googlecode.com/svn/trunk@9962 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/experimental/PdfViewer/pdfparser/native/SkPdfObject.cpp b/experimental/PdfViewer/pdfparser/native/SkPdfObject.cpp
new file mode 100644
index 0000000..57e9abb
--- /dev/null
+++ b/experimental/PdfViewer/pdfparser/native/SkPdfObject.cpp
@@ -0,0 +1,85 @@
+
+#include "SkPdfObject.h"
+#include "SkPdfStreamCommonDictionary_autogen.h"
+
+#include "SkFlate.h"
+#include "SkStream.h"
+#include "SkPdfNativeTokenizer.h"
+
+SkPdfObject SkPdfObject::kNull = SkPdfObject::makeNull();
+
+bool SkPdfObject::applyFlateDecodeFilter(SkPdfAllocator* allocator) {
+ if (!SkFlate::HaveFlate()) {
+ // TODO(edisonn): warn, make callers handle it
+ return false;
+ }
+
+ SkMemoryStream skstream(fStr.fBuffer, fStr.fBytes >> 1, false);
+ SkDynamicMemoryWStream uncompressedData;
+
+ if (SkFlate::Inflate(&skstream, &uncompressedData)) {
+ fStr.fBytes = (uncompressedData.bytesWritten() << 1) + kUnfilteredStreamBit;
+ fStr.fBuffer = (unsigned char*)allocator->alloc(uncompressedData.bytesWritten());
+ uncompressedData.copyTo(fStr.fBuffer);
+ return true;
+ } else {
+ // TODO(edisonn): warn, make callers handle it
+ return false;
+ }
+}
+
+bool SkPdfObject::applyDCTDecodeFilter(SkPdfAllocator* allocator) {
+ // 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, SkPdfAllocator* allocator) {
+ if (strcmp(name, "FlateDecode") == 0) {
+ return applyFlateDecodeFilter(allocator);
+ } else if (strcmp(name, "DCTDecode") == 0) {
+ return applyDCTDecodeFilter(allocator);
+ }
+ // TODO(edisonn): allert, not supported, but should be implemented asap
+ return false;
+}
+
+bool SkPdfObject::filterStream(SkPdfAllocator* allocator) {
+ if (!hasStream()) {
+ return false;
+ }
+
+ if (isStreamFiltered()) {
+ return true;
+ }
+
+ SkPdfStreamCommonDictionary* stream = (SkPdfStreamCommonDictionary*)this;
+
+ if (!stream->has_Filter()) {
+ fStr.fBytes = ((fStr.fBytes >> 1) << 1) + kFilteredStreamBit;
+ return true;
+ }
+
+ if (stream->isFilterAName(NULL)) {
+ std::string filterName = stream->getFilterAsName(NULL);
+ applyFilter(filterName.c_str(), allocator);
+ } 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(), allocator)) {
+ break;
+ }
+ } else {
+ // TODO(edisonn): report warning
+ }
+ }
+ }
+
+ fStr.fBytes = ((fStr.fBytes >> 1) << 1) + kFilteredStreamBit;
+
+ return true;
+}