/*

 * Copyright (C) 2009 Apple Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

 */

#import "WebPDFDocumentExtras.h"

#import "WebTypesInternal.h"

#import <JavaScriptCore/Vector.h>

#import <JavaScriptCore/RetainPtr.h>

#import <PDFKit/PDFDocument.h>

#import <objc/objc-runtime.h>

#if defined(BUILDING_ON_TIGER) || defined(BUILDING_ON_LEOPARD)

@interface PDFDocument (Internal)

- (CGPDFDocumentRef)documentRef;

@end

#endif

static void appendValuesInPDFNameSubtreeToVector(CGPDFDictionaryRef subtree, Vector<CGPDFObjectRef>& values)

{

    CGPDFArrayRef names;

    if (CGPDFDictionaryGetArray(subtree, "Names", &names)) {

        size_t nameCount = CGPDFArrayGetCount(names) / 2;

        for (size_t i = 0; i < nameCount; ++i) {

            CGPDFObjectRef object;

            CGPDFArrayGetObject(names, 2 * i + 1, &object);

            values.append(object);

        }

        return;

    }

    CGPDFArrayRef kids;

    if (!CGPDFDictionaryGetArray(subtree, "Kids", &kids))

        return;

    size_t kidCount = CGPDFArrayGetCount(kids);

    for (size_t i = 0; i < kidCount; ++i) {

        CGPDFDictionaryRef kid;

        if (!CGPDFArrayGetDictionary(kids, i, &kid))

            continue;

        appendValuesInPDFNameSubtreeToVector(kid, values);

    }

}

static void getAllValuesInPDFNameTree(CGPDFDictionaryRef tree, Vector<CGPDFObjectRef>& allValues)

{

    appendValuesInPDFNameSubtreeToVector(tree, allValues);

}

NSArray *allScriptsInPDFDocument(PDFDocument *document)

{

    NSMutableArray *scripts = [NSMutableArray array];

    CGPDFDocumentRef pdfDocument = [document documentRef];

    if (!pdfDocument)

        return scripts;

    CGPDFDictionaryRef pdfCatalog = CGPDFDocumentGetCatalog(pdfDocument);

    if (!pdfCatalog)

        return scripts;

    // Get the dictionary of all document-level name trees.

    CGPDFDictionaryRef namesDictionary;

    if (!CGPDFDictionaryGetDictionary(pdfCatalog, "Names", &namesDictionary))

        return scripts;

    // Get the document-level "JavaScript" name tree.

    CGPDFDictionaryRef javaScriptNameTree;

    if (!CGPDFDictionaryGetDictionary(namesDictionary, "JavaScript", &javaScriptNameTree))

        return scripts;

    // The names are aribtrary. We are only interested in the values.

    Vector<CGPDFObjectRef> objects;

    getAllValuesInPDFNameTree(javaScriptNameTree, objects);

    size_t objectCount = objects.size();

    for (size_t i = 0; i < objectCount; ++i) {

        CGPDFDictionaryRef javaScriptAction;

        if (!CGPDFObjectGetValue(reinterpret_cast<CGPDFObjectRef>(objects[i]), kCGPDFObjectTypeDictionary, &javaScriptAction))

            continue;

        // A JavaScript action must have an action type of "JavaScript".

        const char* actionType;

        if (!CGPDFDictionaryGetName(javaScriptAction, "S", &actionType) || strcmp(actionType, "JavaScript"))

            continue;

        const UInt8* bytes = 0;

        CFIndex length;

        CGPDFStreamRef stream;

        CGPDFStringRef string;

        RetainPtr<CFDataRef> data;

        if (CGPDFDictionaryGetStream(javaScriptAction, "JS", &stream)) {

            CGPDFDataFormat format;

            data.adoptCF(CGPDFStreamCopyData(stream, &format));

            if (!data)

                continue;

            bytes = CFDataGetBytePtr(data.get());

            length = CFDataGetLength(data.get());

        } else if (CGPDFDictionaryGetString(javaScriptAction, "JS", &string)) {

            bytes = CGPDFStringGetBytePtr(string);

            length = CGPDFStringGetLength(string);

        }

        if (!bytes)

            continue;

        NSStringEncoding encoding = (length > 1 && bytes[0] == 0xFE && bytes[1] == 0xFF) ? NSUnicodeStringEncoding : NSUTF8StringEncoding;

        NSString *script = [[NSString alloc] initWithBytes:bytes length:length encoding:encoding];

        [scripts addObject:script];

        [script release];

    }

    return scripts;

}