darling-cocotron/Onyx2D/O2PDFDocument.m

/* Copyright (c) 2007 Christopher J. W. Lloyd

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */

#import <Onyx2D/O2PDFDocument.h>

#import <Onyx2D/O2PDFArray.h>
#import <Onyx2D/O2PDFDictionary.h>
#import <Onyx2D/O2PDFPage.h>
#import <Onyx2D/O2PDFScanner.h>
#import <Onyx2D/O2PDFString.h>
#import <Onyx2D/O2PDFxref.h>

#import <limits.h>

@implementation O2PDFDocument

- initWithData: (NSData *) data {
    if (!O2PDFScanVersion([data bytes], [data length], &_version)) {
        [self dealloc];
        return nil;
    }
    [_version retain];

    if (!O2PDFParse_xref(data, &_xref)) {
        [self dealloc];
        return nil;
    }
    [_xref retain];

    return self;
}

- initWithDataProvider: (O2DataProvider *) provider {
    return [self initWithData: [provider data]];
}

- initWithURL: (NSURL *) url {
    return [self initWithData: [NSData dataWithContentsOfURL: url]];
}

- (void) dealloc {
    [_xref release];
    [super dealloc];
}

- (O2PDFxref *) xref {
    return _xref;
}

- (O2PDFDictionary *) trailer {
    return [_xref trailer];
}

- (O2PDFDictionary *) catalog {
    O2PDFDictionary *result;

    if (![[self trailer] getDictionaryForKey: "Root" value: &result])
        return nil;

    return result;
}

- (O2PDFDictionary *) infoDictionary {
    O2PDFDictionary *result;

    if (![[self trailer] getDictionaryForKey: "Info" value: &result])
        return nil;

    return result;
}

- (O2PDFDictionary *) encryptDictionary {
    O2PDFDictionary *result;

    if (![[self trailer] getDictionaryForKey: "Encrypt" value: &result])
        return nil;

    return result;
}

- (O2PDFDictionary *) pagesRoot {
    O2PDFDictionary *result;

    if (![[self catalog] getDictionaryForKey: "Pages" value: &result])
        return nil;

    return result;
}

- (int) pageCount {
    O2PDFInteger result;

    if (![[self pagesRoot] getIntegerForKey: "Count" value: &result])
        return 0;

    return result;
}

- (O2PDFPage *) pageAtNumber: (int) pageNumber
                       pages: (O2PDFDictionary *) pages
                 pagesOffset: (int) pagesOffset
{
    O2PDFArray *kids;
    O2PDFInteger i, kidsCount, pageCount;

    if (![pages getArrayForKey: "Kids" value: &kids])
        return nil;

    if (![pages getIntegerForKey: "Count" value: &pageCount])
        return nil;

    kidsCount = [kids count];
    for (i = 0; i < kidsCount; i++) {
        O2PDFDictionary *check;
        const char *type;

        if (![kids getDictionaryAtIndex: i value: &check])
            return nil;

        if (![check getNameForKey: "Type" value: &type])
            return nil;

        if (strcmp(type, "Page") == 0) {
            if (pagesOffset == pageNumber)
                return [O2PDFPage pdfPageWithDocument: self
                                           pageNumber: pageNumber
                                           dictionary: check];

            pagesOffset++;
        } else if (strcmp(type, "Pages") == 0) {
            O2PDFPage *checkPage = [self pageAtNumber: pageNumber
                                                pages: check
                                          pagesOffset: pagesOffset];

            if (checkPage != nil)
                return checkPage;
            else {
                O2PDFInteger checkCount;

                if (![check getIntegerForKey: "Count" value: &checkCount])
                    return nil;

                pagesOffset += checkCount;
            }
        } else
            return nil;
    }
    return nil;
}

- (O2PDFPage *) pageAtNumber: (int) pageNumber {
    O2PDFDictionary *pages = [self pagesRoot];
    O2PDFPage *page = [self pageAtNumber: pageNumber - 1
                                   pages: pages
                             pagesOffset: 0];

    return page;
}

@end