pdfviewer: load files with missing xref (we need in order to help with testing, as most good pdfx in the whild miss the xref). add period as a valid character to start a real value.
Review URL: https://codereview.chromium.org/21096006
git-svn-id: http://skia.googlecode.com/svn/trunk@10423 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/experimental/PdfViewer/pdfparser/native/SkNativeParsedPDF.cpp b/experimental/PdfViewer/pdfparser/native/SkNativeParsedPDF.cpp
index 8892ee2..e54ba82 100644
--- a/experimental/PdfViewer/pdfparser/native/SkNativeParsedPDF.cpp
+++ b/experimental/PdfViewer/pdfparser/native/SkNativeParsedPDF.cpp
@@ -123,7 +123,7 @@
bool storeCatalog = true;
while (xrefByteOffset >= 0) {
const unsigned char* trailerStart = readCrossReferenceSection(fFileContent + xrefByteOffset, xrefstartKeywordLine);
- xrefByteOffset = readTrailer(trailerStart, xrefstartKeywordLine, storeCatalog);
+ readTrailer(trailerStart, xrefstartKeywordLine, storeCatalog, &xrefByteOffset, false);
storeCatalog = false;
}
@@ -141,6 +141,12 @@
}
}
+ // TODO(edisonn): clean up this doc, or better, let the caller call again and build a new doc
+ // caller should be a static function.
+ if (pages() == 0) {
+ loadWithoutXRef();
+ }
+
// TODO(edisonn): corrupted pdf, read it from beginning and rebuild (xref, trailer, or just reall all objects)
// 0 pages
@@ -148,6 +154,67 @@
// and resolve references?... or not ...
}
+void SkNativeParsedPDF::loadWithoutXRef() {
+ const unsigned char* current = fFileContent;
+ const unsigned char* end = fFileContent + fContentLength;
+
+ // TODO(edisonn): read pdf version
+ current = ignoreLine(current, end);
+
+ current = skipPdfWhiteSpaces(0, current, end);
+ while (current < end) {
+ SkPdfObject token;
+ current = nextObject(0, current, end, &token, NULL, NULL);
+ if (token.isInteger()) {
+ int id = (int)token.intValue();
+
+ token.reset();
+ current = nextObject(0, current, end, &token, NULL, NULL);
+ // int generation = (int)token.intValue(); // TODO(edisonn): ignored for now
+
+ token.reset();
+ current = nextObject(0, current, end, &token, NULL, NULL);
+ // TODO(edisonn): must be obj, return error if not? ignore ?
+ if (!token.isKeyword("obj")) {
+ continue;
+ }
+
+ while (fObjects.count() < id + 1) {
+ reset(fObjects.append());
+ }
+
+ fObjects[id].fOffset = current - fFileContent;
+
+ SkPdfObject* obj = fAllocator->allocObject();
+ current = nextObject(0, current, end, obj, fAllocator, this);
+
+ fObjects[id].fResolvedReference = obj;
+ fObjects[id].fObj = obj;
+
+ // set objects
+ } else if (token.isKeyword("trailer")) {
+ long dummy;
+ current = readTrailer(current, end, true, &dummy, true);
+ } else if (token.isKeyword("startxref")) {
+ token.reset();
+ current = nextObject(0, current, end, &token, NULL, NULL); // ignore
+ }
+
+ current = skipPdfWhiteSpaces(0, current, end);
+ }
+
+ if (fRootCatalogRef) {
+ fRootCatalog = (SkPdfCatalogDictionary*)resolveReference(fRootCatalogRef);
+ if (fRootCatalog->isDictionary() && fRootCatalog->valid()) {
+ SkPdfPageTreeNodeDictionary* tree = fRootCatalog->Pages(this);
+ if (tree && tree->isDictionary() && tree->valid()) {
+ fillPages(tree);
+ }
+ }
+ }
+
+}
+
// TODO(edisonn): NYI
SkNativeParsedPDF::~SkNativeParsedPDF() {
sk_free((void*)fFileContent);
@@ -208,43 +275,47 @@
return current;
}
-long SkNativeParsedPDF::readTrailer(const unsigned char* trailerStart, const unsigned char* trailerEnd, bool storeCatalog) {
- SkPdfObject trailerKeyword;
- // TODO(edisonn): use null allocator, and let it just fail if memory
- // needs allocated (but no crash)!
- const unsigned char* current =
- nextObject(0, trailerStart, trailerEnd, &trailerKeyword, NULL, NULL);
+const unsigned char* SkNativeParsedPDF::readTrailer(const unsigned char* trailerStart, const unsigned char* trailerEnd, bool storeCatalog, long* prev, bool skipKeyword) {
+ *prev = -1;
- if (!trailerKeyword.isKeyword() || strlen("trailer") != trailerKeyword.lenstr() ||
- strncmp(trailerKeyword.c_str(), "trailer", strlen("trailer")) != 0) {
- // TODO(edisonn): report warning, rebuild trailer from objects.
- return -1;
+ const unsigned char* current = trailerStart;
+ if (!skipKeyword) {
+ SkPdfObject trailerKeyword;
+ // TODO(edisonn): use null allocator, and let it just fail if memory
+ // needs allocated (but no crash)!
+ current = nextObject(0, current, trailerEnd, &trailerKeyword, NULL, NULL);
+
+ if (!trailerKeyword.isKeyword() || strlen("trailer") != trailerKeyword.lenstr() ||
+ strncmp(trailerKeyword.c_str(), "trailer", strlen("trailer")) != 0) {
+ // TODO(edisonn): report warning, rebuild trailer from objects.
+ return current;
+ }
}
SkPdfObject token;
current = nextObject(0, current, trailerEnd, &token, fAllocator, NULL);
if (!token.isDictionary()) {
- return -1;
+ return current;
}
SkPdfFileTrailerDictionary* trailer = (SkPdfFileTrailerDictionary*)&token;
if (!trailer->valid()) {
- return -1;
+ return current;
}
if (storeCatalog) {
const SkPdfObject* ref = trailer->Root(NULL);
if (ref == NULL || !ref->isReference()) {
// TODO(edisonn): oops, we have to fix the corrup pdf file
- return -1;
+ return current;
}
fRootCatalogRef = ref;
}
if (trailer->has_Prev()) {
- return (long)trailer->Prev(NULL);
+ *prev = (long)trailer->Prev(NULL);
}
- return -1;
+ return current;
}
void SkNativeParsedPDF::addCrossSectionInfo(int id, int generation, int offset, bool isFreed) {
@@ -255,6 +326,7 @@
fObjects[id].fOffset = offset;
fObjects[id].fObj = NULL;
+ fObjects[id].fResolvedReference = NULL;
}
SkPdfObject* SkNativeParsedPDF::readObject(int id/*, int expectedGeneration*/) {