ObjFW  Diff

#import "OFZIPArchiveEntry+Private.h"
#import "OFDataArray.h"
#import "OFArray.h"
#import "OFDictionary.h"
#import "OFFile.h"
#import "OFInflateStream.h"
#import "OFInflate64Stream.h"

#import "crc32.h"

#import "OFChecksumFailedException.h"
#import "OFInvalidArgumentException.h"
#import "OFInvalidFormatException.h"
#import "OFNotImplementedException.h"
#import "OFOpenItemFailedException.h"
#import "OFOutOfRangeException.h"
#import "OFReadFailedException.h"
#import "OFSeekFailedException.h"
#import "OFUnsupportedVersionException.h"

#define CRC32_MAGIC 0xEDB88320

/*
 * FIXME: Current limitations:
 *  - Split archives are not supported.
 *  - Write support is missing.
 *  - The ZIP has to be a file on the local file system.
 *  - Encrypted files cannot be read.
 */

	*data += 8;
	*size -= 8;

	return field;
}

static uint32_t
calculateCRC32(uint32_t crc, uint8_t *bytes, size_t length)
{
	for (size_t i = 0; i < length; i++) {
		crc ^= bytes[i];

		for (uint8_t j = 0; j < 8; j++)
			crc = (crc >> 1) ^ (CRC32_MAGIC & (~(crc & 1) + 1));
	}

	return crc;
}

static void
seekOrThrowInvalidFormat(OFSeekableStream *stream,
    of_offset_t offset, int whence)
{
	@try {
		[stream seekToOffset: offset
			      whence: whence];

		min = (length < _size ? length : (size_t)_size);
		ret = [_decompressedStream readIntoBuffer: buffer
						   length: min];
		_size -= ret;
	}

	_CRC32 = calculateCRC32(_CRC32, buffer, ret);
	_CRC32 = of_crc32(_CRC32, buffer, ret);

	return ret;
}

- (void)close
{
	_closed = true;
}
@end