pdfviewer: debug code for drawText (show magenta background for text, to show text even when we fai…

experimental/PdfViewer/pdfparser/native/SkPdfNativeDoc.cpp

-#include "SkNativeParsedPDF.h"
+#include "SkPdfNativeDoc.h"
 #include "SkPdfNativeTokenizer.h"
-#include "SkPdfBasics.h"
-#include "SkPdfObject.h"
+#include "SkPdfNativeObject.h"
 
 #include <stdio.h>
 #include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 
 #include "SkPdfFileTrailerDictionary_autogen.h"
 #include "SkPdfCatalogDictionary_autogen.h"
 #include "SkPdfPageObjectDictionary_autogen.h"
 #include "SkPdfPageTreeNodeDictionary_autogen.h"
@@ skipping 37 matching lines @@
     while (current < end && !isPdfEOL(*current)) {
         current++;
     }
     current++;
     if (current < end && isPdfEOL(*current) && *current != *(current - 1)) {
         current++;
     }
     return current;
 }
 
-SkNativeParsedPDF* gDoc = NULL;
+SkPdfNativeDoc* gDoc = NULL;
 
 // TODO(edisonn): NYI
 // TODO(edisonn): 3 constructuctors from URL, from stream, from file ...
 // TODO(edisonn): write one that accepts errors in the file and ignores/fixis them
 // TODO(edisonn): testing:
 // 1) run on a lot of file
 // 2) recoverable corupt file: remove endobj, endsteam, remove other keywords, use other white spaces, insert comments randomly, ...
 // 3) irrecoverable corrupt file
 
-SkNativeParsedPDF::SkNativeParsedPDF(SkStream* stream)
+SkPdfNativeDoc::SkPdfNativeDoc(SkStream* stream)
         : fAllocator(new SkPdfAllocator())
         , fFileContent(NULL)
         , fContentLength(0)
         , fRootCatalogRef(NULL)
         , fRootCatalog(NULL) {
     size_t size = stream->getLength();
     void* ptr = sk_malloc_throw(size);
     stream->read(ptr, size);
 
     init(ptr, size);
 }
 
-SkNativeParsedPDF::SkNativeParsedPDF(const char* path)
+SkPdfNativeDoc::SkPdfNativeDoc(const char* path)
         : fAllocator(new SkPdfAllocator())
         , fFileContent(NULL)
         , fContentLength(0)
         , fRootCatalogRef(NULL)
         , fRootCatalog(NULL) {
     gDoc = this;
     FILE* file = fopen(path, "r");
     // TODO(edisonn): put this in a function that can return NULL
     if (file) {
         size_t size = getFileSize(path);
         void* content = sk_malloc_throw(size);
         bool ok = (0 != fread(content, size, 1, file));
         fclose(file);
         if (!ok) {
             sk_free(content);
             // TODO(edisonn): report read error
             // TODO(edisonn): not nice to return like this from constructor, create a static
             // function that can report NULL for failures.
             return;  // Doc will have 0 pages
         }
 
         init(content, size);
     }
 }
 
-void SkNativeParsedPDF::init(const void* bytes, size_t length) {
+void SkPdfNativeDoc::init(const void* bytes, size_t length) {
     fFileContent = (const unsigned char*)bytes;
     fContentLength = length;
     const unsigned char* eofLine = lineHome(fFileContent, fFileContent + fContentLength - 1);
     const unsigned char* xrefByteOffsetLine = previousLineHome(fFileContent, eofLine);
     const unsigned char* xrefstartKeywordLine = previousLineHome(fFileContent, xrefByteOffsetLine);
 
     if (strcmp((char*)xrefstartKeywordLine, "startxref") != 0) {
         // TODO(edisonn): report/issue
     }
 
@@ skipping 29 matching lines @@
         loadWithoutXRef();
     }
 
     // TODO(edisonn): corrupted pdf, read it from beginning and rebuild (xref, trailer, or just reall all objects)
     // 0 pages
 
     // now actually read all objects if we want, or do it lazyly
     // and resolve references?... or not ...
 }
 
-void SkNativeParsedPDF::loadWithoutXRef() {
+void SkPdfNativeDoc::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;
+        SkPdfNativeObject 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();
+            SkPdfNativeObject* 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);
     }
 
     // TODO(edisonn): hack, detect root catalog - we need to implement liniarized support, and remove this hack.
     if (!fRootCatalogRef) {
         for (unsigned int i = 0 ; i < objects(); i++) {
-            SkPdfObject* obj = object(i);
-            SkPdfObject* root = (obj && obj->isDictionary()) ? obj->get("Root") : NULL;
+            SkPdfNativeObject* obj = object(i);
+            SkPdfNativeObject* root = (obj && obj->isDictionary()) ? obj->get("Root") : NULL;
             if (root && root->isReference()) {
                 fRootCatalogRef = root;
             }
         }
     }
 
 
     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() {
+SkPdfNativeDoc::~SkPdfNativeDoc() {
     sk_free((void*)fFileContent);
     delete fAllocator;
 }
 
-const unsigned char* SkNativeParsedPDF::readCrossReferenceSection(const unsigned char* xrefStart, const unsigned char* trailerEnd) {
-    SkPdfObject xref;
+const unsigned char* SkPdfNativeDoc::readCrossReferenceSection(const unsigned char* xrefStart, const unsigned char* trailerEnd) {
+    SkPdfNativeObject xref;
     const unsigned char* current = nextObject(0, xrefStart, trailerEnd, &xref, NULL, NULL);
 
     if (!xref.isKeyword("xref")) {
         return trailerEnd;
     }
 
-    SkPdfObject token;
+    SkPdfNativeObject token;
     while (current < trailerEnd) {
         token.reset();
         const unsigned char* previous = current;
         current = nextObject(0, current, trailerEnd, &token, NULL, NULL);
         if (!token.isInteger()) {
             return previous;
         }
 
         int startId = (int)token.intValue();
         token.reset();
@@ skipping 30 matching lines @@
                 return current;
             }
 
             addCrossSectionInfo(startId + i, generation, offset, *token.c_str() == 'f');
         }
     }
     // TODO(edisonn): it should never get here? there is no trailer?
     return current;
 }
 
-const unsigned char* SkNativeParsedPDF::readTrailer(const unsigned char* trailerStart, const unsigned char* trailerEnd, bool storeCatalog, long* prev, bool skipKeyword) {
+const unsigned char* SkPdfNativeDoc::readTrailer(const unsigned char* trailerStart, const unsigned char* trailerEnd, bool storeCatalog, long* prev, bool skipKeyword) {
     *prev = -1;
 
     const unsigned char* current = trailerStart;
     if (!skipKeyword) {
-        SkPdfObject trailerKeyword;
+        SkPdfNativeObject 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;
+    SkPdfNativeObject token;
     current = nextObject(0, current, trailerEnd, &token, fAllocator, NULL);
     if (!token.isDictionary()) {
         return current;
     }
     SkPdfFileTrailerDictionary* trailer = (SkPdfFileTrailerDictionary*)&token;
     if (!trailer->valid()) {
         return current;
     }
 
     if (storeCatalog) {
-        SkPdfObject* ref = trailer->Root(NULL);
+        SkPdfNativeObject* ref = trailer->Root(NULL);
         if (ref == NULL || !ref->isReference()) {
             // TODO(edisonn): oops, we have to fix the corrup pdf file
             return current;
         }
         fRootCatalogRef = ref;
     }
 
     if (trailer->has_Prev()) {
         *prev = (long)trailer->Prev(NULL);
     }
 
     return current;
 }
 
-void SkNativeParsedPDF::addCrossSectionInfo(int id, int generation, int offset, bool isFreed) {
+void SkPdfNativeDoc::addCrossSectionInfo(int id, int generation, int offset, bool isFreed) {
     // TODO(edisonn): security here
     while (fObjects.count() < id + 1) {
         reset(fObjects.append());
     }
 
     fObjects[id].fOffset = offset;
     fObjects[id].fObj = NULL;
     fObjects[id].fResolvedReference = NULL;
 }
 
-SkPdfObject* SkNativeParsedPDF::readObject(int id/*, int expectedGeneration*/) {
+SkPdfNativeObject* SkPdfNativeDoc::readObject(int id/*, int expectedGeneration*/) {
     long startOffset = fObjects[id].fOffset;
     //long endOffset = fObjects[id].fOffsetEnd;
     // TODO(edisonn): use hinted endOffset
     // TODO(edisonn): current implementation will result in a lot of memory usage
     // to decrease memory usage, we wither need to be smart and know where objects end, and we will
     // alocate only the chancks needed, or the tokenizer will not make copies, but then it needs to
     // cache the results so it does not go twice on the same buffer
     const unsigned char* current = fFileContent + startOffset;
     const unsigned char* end = fFileContent + fContentLength;
 
     SkPdfNativeTokenizer tokenizer(current, end - current, fMapper, fAllocator, this);
 
-    SkPdfObject idObj;
-    SkPdfObject generationObj;
-    SkPdfObject objKeyword;
-    SkPdfObject* dict = fAllocator->allocObject();
+    SkPdfNativeObject idObj;
+    SkPdfNativeObject generationObj;
+    SkPdfNativeObject objKeyword;
+    SkPdfNativeObject* dict = fAllocator->allocObject();
 
     current = nextObject(0, current, end, &idObj, NULL, NULL);
     if (current >= end) {
         // TODO(edisonn): report warning/error
         return NULL;
     }
 
     current = nextObject(0, current, end, &generationObj, NULL, NULL);
     if (current >= end) {
         // TODO(edisonn): report warning/error
@@ skipping 14 matching lines @@
         // TODO(edisonn): report warning/error
     }
 
     current = nextObject(1, current, end, dict, fAllocator, this);
 
     // TODO(edisonn): report warning/error - verify last token is endobj
 
     return dict;
 }
 
-void SkNativeParsedPDF::fillPages(SkPdfPageTreeNodeDictionary* tree) {
+void SkPdfNativeDoc::fillPages(SkPdfPageTreeNodeDictionary* tree) {
     SkPdfArray* kids = tree->Kids(this);
     if (kids == NULL) {
         *fPages.append() = (SkPdfPageObjectDictionary*)tree;
         return;
     }
 
     int cnt = kids->size();
     for (int i = 0; i < cnt; i++) {
-        SkPdfObject* obj = resolveReference(kids->objAtAIndex(i));
-        if (fMapper->mapPageObjectDictionary(obj) != kPageObjectDictionary_SkPdfObjectType) {
+        SkPdfNativeObject* obj = resolveReference(kids->objAtAIndex(i));
+        if (fMapper->mapPageObjectDictionary(obj) != kPageObjectDictionary_SkPdfNativeObjectType) {
             *fPages.append() = (SkPdfPageObjectDictionary*)obj;
         } else {
             // TODO(edisonn): verify that it is a page tree indeed
             fillPages((SkPdfPageTreeNodeDictionary*)obj);
         }
     }
 }
 
-int SkNativeParsedPDF::pages() const {
+int SkPdfNativeDoc::pages() const {
     return fPages.count();
 }
 
-SkPdfPageObjectDictionary* SkNativeParsedPDF::page(int page) {
+SkPdfPageObjectDictionary* SkPdfNativeDoc::page(int page) {
     SkASSERT(page >= 0 && page < fPages.count());
     return fPages[page];
 }
 
 
-SkPdfResourceDictionary* SkNativeParsedPDF::pageResources(int page) {
+SkPdfResourceDictionary* SkPdfNativeDoc::pageResources(int page) {
     SkASSERT(page >= 0 && page < fPages.count());
     return fPages[page]->Resources(this);
 }
 
 // TODO(edisonn): Partial implemented. Move the logics directly in the code generator for inheritable and default value?
-SkRect SkNativeParsedPDF::MediaBox(int page) {
+SkRect SkPdfNativeDoc::MediaBox(int page) {
     SkPdfPageObjectDictionary* current = fPages[page];
     while (!current->has_MediaBox() && current->has_Parent()) {
         current = (SkPdfPageObjectDictionary*)current->Parent(this);
     }
     if (current) {
         return current->MediaBox(this);
     }
     return SkRect::MakeEmpty();
 }
 
 // TODO(edisonn): stream or array ... ? for now only array
-SkPdfNativeTokenizer* SkNativeParsedPDF::tokenizerOfPage(int page,
+SkPdfNativeTokenizer* SkPdfNativeDoc::tokenizerOfPage(int page,
                                                          SkPdfAllocator* allocator) {
     if (fPages[page]->isContentsAStream(this)) {
         return tokenizerOfStream(fPages[page]->getContentsAsStream(this), allocator);
     } else {
         // TODO(edisonn): NYI, we need to concatenate all streams in the array or make the tokenizer smart
         // so we don't allocate new memory
         return NULL;
     }
 }
 
-SkPdfNativeTokenizer* SkNativeParsedPDF::tokenizerOfStream(SkPdfObject* stream,
+SkPdfNativeTokenizer* SkPdfNativeDoc::tokenizerOfStream(SkPdfNativeObject* stream,
                                                            SkPdfAllocator* allocator) {
     if (stream == NULL) {
         return NULL;
     }
 
     return new SkPdfNativeTokenizer(stream, fMapper, allocator, this);
 }
 
 // TODO(edisonn): NYI
-SkPdfNativeTokenizer* SkNativeParsedPDF::tokenizerOfBuffer(const unsigned char* buffer, size_t len,
+SkPdfNativeTokenizer* SkPdfNativeDoc::tokenizerOfBuffer(const unsigned char* buffer, size_t len,
                                                            SkPdfAllocator* allocator) {
     // warning does not track two calls in the same buffer! the buffer is updated!
     // make a clean copy if needed!
     return new SkPdfNativeTokenizer(buffer, len, fMapper, allocator, this);
 }
 
-size_t SkNativeParsedPDF::objects() const {
+size_t SkPdfNativeDoc::objects() const {
     return fObjects.count();
 }
 
-SkPdfObject* SkNativeParsedPDF::object(int i) {
+SkPdfNativeObject* SkPdfNativeDoc::object(int i) {
     SkASSERT(!(i < 0 || i > fObjects.count()));
 
     if (i < 0 || i > fObjects.count()) {
         return NULL;
     }
 
     if (fObjects[i].fObj == NULL) {
         // TODO(edisonn): when we read the cross reference sections, store the start of the next object
         // and fill fOffsetEnd
         fObjects[i].fObj = readObject(i);
     }
 
     return fObjects[i].fObj;
 }
 
-const SkPdfMapper* SkNativeParsedPDF::mapper() const {
+const SkPdfMapper* SkPdfNativeDoc::mapper() const {
     return fMapper;
 }
 
-SkPdfReal* SkNativeParsedPDF::createReal(double value) const {
-    SkPdfObject* obj = fAllocator->allocObject();
-    SkPdfObject::makeReal(value, obj);
+SkPdfReal* SkPdfNativeDoc::createReal(double value) const {
+    SkPdfNativeObject* obj = fAllocator->allocObject();
+    SkPdfNativeObject::makeReal(value, obj);
     return (SkPdfReal*)obj;
 }
 
-SkPdfInteger* SkNativeParsedPDF::createInteger(int value) const {
-    SkPdfObject* obj = fAllocator->allocObject();
-    SkPdfObject::makeInteger(value, obj);
+SkPdfInteger* SkPdfNativeDoc::createInteger(int value) const {
+    SkPdfNativeObject* obj = fAllocator->allocObject();
+    SkPdfNativeObject::makeInteger(value, obj);
     return (SkPdfInteger*)obj;
 }
 
-SkPdfString* SkNativeParsedPDF::createString(const unsigned char* sz, size_t len) const {
-    SkPdfObject* obj = fAllocator->allocObject();
-    SkPdfObject::makeString(sz, len, obj);
+SkPdfString* SkPdfNativeDoc::createString(const unsigned char* sz, size_t len) const {
+    SkPdfNativeObject* obj = fAllocator->allocObject();
+    SkPdfNativeObject::makeString(sz, len, obj);
     return (SkPdfString*)obj;
 }
 
-SkPdfAllocator* SkNativeParsedPDF::allocator() const {
+SkPdfAllocator* SkPdfNativeDoc::allocator() const {
     return fAllocator;
 }
 
 // TODO(edisonn): fix infinite loop if ref to itself!
 // TODO(edisonn): perf, fix refs at load, and resolve will simply return fResolvedReference?
-SkPdfObject* SkNativeParsedPDF::resolveReference(SkPdfObject* ref) {
+SkPdfNativeObject* SkPdfNativeDoc::resolveReference(SkPdfNativeObject* ref) {
     if (ref && ref->isReference()) {
         int id = ref->referenceId();
         // TODO(edisonn): generation/updates not supported now
         //int gen = ref->referenceGeneration();
 
         // TODO(edisonn): verify id and gen expected
         if (id < 0 || id >= fObjects.count()) {
             // TODO(edisonn): report error/warning
             return NULL;
         }
@@ skipping 18 matching lines @@
                 fObjects[id].fResolvedReference = resolveReference(fObjects[id].fObj);
             }
         }
 
 #ifdef PDF_TRACE
         printf("\nresolve(%s) = %s\n", ref->toString(0).c_str(), fObjects[id].fResolvedReference->toString(0, ref->toString().size() + 13).c_str());
 #endif
         return fObjects[id].fResolvedReference;
     }
 
-
-
     // TODO(edisonn): fix the mess with const, probably we need to remove it pretty much everywhere
-    return (SkPdfObject*)ref;
+    return (SkPdfNativeObject*)ref;
 }
 
-size_t SkNativeParsedPDF::bytesUsed() const {
+size_t SkPdfNativeDoc::bytesUsed() const {
     return fAllocator->bytesUsed() +
            fContentLength +
            fObjects.count() * sizeof(PublicObjectEntry) +
            fPages.count() * sizeof(SkPdfPageObjectDictionary*) +
            sizeof(*this);
 }