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      1 /*
      2  * Copyright 2013 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "SkPdfNativeObject.h"
      9 
     10 #include "SkBitmap.h"
     11 #include "SkFlate.h"
     12 #include "SkPdfFont.h"
     13 #include "SkPdfNativeTokenizer.h"
     14 #include "SkPdfReporter.h"
     15 #include "SkStream.h"
     16 
     17 // TODO(edisonn): mac builder does not find the header ... but from headers is ok
     18 //#include "SkPdfStreamCommonDictionary_autogen.h"
     19 #include "SkPdfHeaders_autogen.h"
     20 
     21 
     22 SkPdfNativeObject SkPdfNativeObject::kNull = SkPdfNativeObject::makeNull();
     23 
     24 bool SkPdfNativeObject::applyFlateDecodeFilter() {
     25     const unsigned char* old = fStr.fBuffer;
     26     bool deleteOld = isStreamOwned();
     27 
     28     SkMemoryStream skstream(fStr.fBuffer, fStr.fBytes >> 2, false);
     29     SkDynamicMemoryWStream uncompressedData;
     30 
     31     if (SkFlate::Inflate(&skstream, &uncompressedData)) {
     32         fStr.fBytes = (uncompressedData.bytesWritten() << 2) + kOwnedStreamBit +
     33                       kUnfilteredStreamBit;
     34         fStr.fBuffer = (const unsigned char*)new unsigned char[uncompressedData.bytesWritten()];
     35         uncompressedData.copyTo((void*)fStr.fBuffer);
     36 
     37         if (deleteOld) {
     38             delete[] old;
     39         }
     40 
     41         return true;
     42     } else {
     43         SkPdfReport(kIgnoreError_SkPdfIssueSeverity, kBadStream_SkPdfIssue, "inflate failed", this, NULL);
     44         return false;
     45     }
     46 }
     47 
     48 bool SkPdfNativeObject::applyDCTDecodeFilter() {
     49     // applyDCTDecodeFilter will fail, and it won't allow any more filters.
     50     // technically, it would be possible, but not a real world scenario.
     51     // in this way we create the image from the DCT stream directly.
     52     return false;
     53 }
     54 
     55 bool SkPdfNativeObject::applyFilter(const char* name) {
     56     if (strcmp(name, "FlateDecode") == 0) {
     57         return applyFlateDecodeFilter();
     58     } else if (strcmp(name, "DCTDecode") == 0) {
     59         return applyDCTDecodeFilter();
     60     }
     61     SkPdfReport(kCodeWarning_SkPdfIssueSeverity, kNYI_SkPdfIssue, "filter not supported", this,
     62                 NULL);
     63     return false;
     64 }
     65 
     66 bool SkPdfNativeObject::filterStream() {
     67     SkPdfMarkObjectUsed();
     68 
     69     if (!hasStream()) {
     70         SkPdfReport(kIgnoreError_SkPdfIssueSeverity, kBadStream_SkPdfIssue, "No Stream", this,
     71                     NULL);
     72         return false;
     73     }
     74 
     75     if (isStreamFiltered()) {
     76         return true;
     77     }
     78 
     79     SkPdfStreamCommonDictionary* stream = (SkPdfStreamCommonDictionary*)this;
     80 
     81     if (!stream->has_Filter()) {
     82         fStr.fBytes = ((fStr.fBytes >> 1) << 1) + kFilteredStreamBit;
     83     } else if (stream->isFilterAName(NULL)) {
     84         SkString filterName = stream->getFilterAsName(NULL);
     85         applyFilter(filterName.c_str());
     86     } else if (stream->isFilterAArray(NULL)) {
     87         const SkPdfArray* filters = stream->getFilterAsArray(NULL);
     88         int cnt = (int) filters->size();
     89         for (int i = cnt - 1; i >= 0; i--) {
     90             const SkPdfNativeObject* filterName = filters->objAtAIndex(i);
     91             if (filterName != NULL && filterName->isName()) {
     92                 if (!applyFilter(filterName->nameValue())) {
     93                     break;
     94                 }
     95             } else {
     96                 SkPdfReport(kIgnoreError_SkPdfIssueSeverity, kIncositentSyntax_SkPdfIssue,
     97                             "filter name should be a Name", this, NULL);
     98             }
     99         }
    100     }
    101 
    102     return true;
    103 }
    104 
    105 void SkPdfNativeObject::releaseData() {
    106 #ifdef PDF_TRACK_OBJECT_USAGE
    107     SkPdfReportIf(!fUsed, kInfo_SkPdfIssueSeverity, kUnusedObject_SkPdfIssue,
    108                   "Unused object in rendering", this, NULL);
    109 #endif  // PDF_TRACK_OBJECT_USAGE
    110 
    111     SkPdfMarkObjectUnused();
    112 
    113     if (fData) {
    114         switch (fDataType) {
    115             case kFont_Data:
    116                 delete (SkPdfFont*)fData;
    117                 break;
    118             case kBitmap_Data:
    119                 delete (SkBitmap*)fData;
    120                 break;
    121             default:
    122                 SkASSERT(false);
    123                 break;
    124         }
    125     }
    126     fData = NULL;
    127     fDataType = kEmpty_Data;
    128 }
    129