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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
40static 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
66static void getAllValuesInPDFNameTree(CGPDFDictionaryRef tree, Vector<CGPDFObjectRef>& allValues)
67{
68    appendValuesInPDFNameSubtreeToVector(tree, allValues);
69}
70
71NSArray *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            bytes = CFDataGetBytePtr(data.get());
116            length = CFDataGetLength(data.get());
117        } else if (CGPDFDictionaryGetString(javaScriptAction, "JS", &string)) {
118            bytes = CGPDFStringGetBytePtr(string);
119            length = CGPDFStringGetLength(string);
120        }
121        if (!bytes)
122            continue;
123
124        NSStringEncoding encoding = (length > 1 && bytes[0] == 0xFE && bytes[1] == 0xFF) ? NSUnicodeStringEncoding : NSUTF8StringEncoding;
125        NSString *script = [[NSString alloc] initWithBytes:bytes length:length encoding:encoding];
126        [scripts addObject:script];
127        [script release];
128    }
129
130    return scripts;
131}
132