Home | History | Annotate | Download | only in WebView 
      1 /*
      2  * Copyright (C) 2009 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #import "WebPDFDocumentExtras.h"
     27 
     28 #import "WebTypesInternal.h"
     29 #import <JavaScriptCore/Vector.h>
     30 #import <JavaScriptCore/RetainPtr.h>
     31 #import <PDFKit/PDFDocument.h>
     32 #import <objc/objc-runtime.h>
     33 
     34 #if defined(BUILDING_ON_TIGER) || defined(BUILDING_ON_LEOPARD)
     35 @interface PDFDocument (Internal)
     36 - (CGPDFDocumentRef)documentRef;
     37 @end
     38 #endif
     39 
     40 static void appendValuesInPDFNameSubtreeToVector(CGPDFDictionaryRef subtree, Vector<CGPDFObjectRef>& values)
     41 {
     42     CGPDFArrayRef names;
     43     if (CGPDFDictionaryGetArray(subtree, "Names", &names)) {
     44         size_t nameCount = CGPDFArrayGetCount(names) / 2;
     45         for (size_t i = 0; i < nameCount; ++i) {
     46             CGPDFObjectRef object;
     47             CGPDFArrayGetObject(names, 2 * i + 1, &object);
     48             values.append(object);
     49         }
     50         return;
     51     }
     52 
     53     CGPDFArrayRef kids;
     54     if (!CGPDFDictionaryGetArray(subtree, "Kids", &kids))
     55         return;
     56 
     57     size_t kidCount = CGPDFArrayGetCount(kids);
     58     for (size_t i = 0; i < kidCount; ++i) {
     59         CGPDFDictionaryRef kid;
     60         if (!CGPDFArrayGetDictionary(kids, i, &kid))
     61             continue;
     62         appendValuesInPDFNameSubtreeToVector(kid, values);
     63     }
     64 }
     65 
     66 static void getAllValuesInPDFNameTree(CGPDFDictionaryRef tree, Vector<CGPDFObjectRef>& allValues)
     67 {
     68     appendValuesInPDFNameSubtreeToVector(tree, allValues);
     69 }
     70 
     71 NSArray *allScriptsInPDFDocument(PDFDocument *document)
     72 {
     73     NSMutableArray *scripts = [NSMutableArray array];
     74     CGPDFDocumentRef pdfDocument = [document documentRef];
     75     if (!pdfDocument)
     76         return scripts;
     77 
     78     CGPDFDictionaryRef pdfCatalog = CGPDFDocumentGetCatalog(pdfDocument);
     79     if (!pdfCatalog)
     80         return scripts;
     81 
     82     // Get the dictionary of all document-level name trees.
     83     CGPDFDictionaryRef namesDictionary;
     84     if (!CGPDFDictionaryGetDictionary(pdfCatalog, "Names", &namesDictionary))
     85         return scripts;
     86 
     87     // Get the document-level "JavaScript" name tree.
     88     CGPDFDictionaryRef javaScriptNameTree;
     89     if (!CGPDFDictionaryGetDictionary(namesDictionary, "JavaScript", &javaScriptNameTree))
     90         return scripts;
     91 
     92     // The names are aribtrary. We are only interested in the values.
     93     Vector<CGPDFObjectRef> objects;
     94     getAllValuesInPDFNameTree(javaScriptNameTree, objects);
     95     size_t objectCount = objects.size();
     96 
     97     for (size_t i = 0; i < objectCount; ++i) {
     98         CGPDFDictionaryRef javaScriptAction;
     99         if (!CGPDFObjectGetValue(reinterpret_cast<CGPDFObjectRef>(objects[i]), kCGPDFObjectTypeDictionary, &javaScriptAction))
    100             continue;
    101 
    102         // A JavaScript action must have an action type of "JavaScript".
    103         const char* actionType;
    104         if (!CGPDFDictionaryGetName(javaScriptAction, "S", &actionType) || strcmp(actionType, "JavaScript"))
    105             continue;
    106 
    107         const UInt8* bytes = 0;
    108         CFIndex length;
    109         CGPDFStreamRef stream;
    110         CGPDFStringRef string;
    111         RetainPtr<CFDataRef> data;
    112         if (CGPDFDictionaryGetStream(javaScriptAction, "JS", &stream)) {
    113             CGPDFDataFormat format;
    114             data.adoptCF(CGPDFStreamCopyData(stream, &format));
    115             if (!data)
    116                 continue;
    117             bytes = CFDataGetBytePtr(data.get());
    118             length = CFDataGetLength(data.get());
    119         } else if (CGPDFDictionaryGetString(javaScriptAction, "JS", &string)) {
    120             bytes = CGPDFStringGetBytePtr(string);
    121             length = CGPDFStringGetLength(string);
    122         }
    123         if (!bytes)
    124             continue;
    125 
    126         NSStringEncoding encoding = (length > 1 && bytes[0] == 0xFE && bytes[1] == 0xFF) ? NSUnicodeStringEncoding : NSUTF8StringEncoding;
    127         NSString *script = [[NSString alloc] initWithBytes:bytes length:length encoding:encoding];
    128         [scripts addObject:script];
    129         [script release];
    130     }
    131 
    132     return scripts;
    133 }
    134