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#import "OFNotOpenException.h"
#import "OFTruncatedDataException.h"
@implementation OFGZIPStream
@synthesize operatingSystemMadeOn = _operatingSystemMadeOn;
@synthesize modificationDate = _modificationDate;
+ (instancetype)streamWithStream: (OFStream *)stream
mode: (OFString *)mode
{
return [[[self alloc] initWithStream: stream
mode: mode] autorelease];
}
- (instancetype)init
{
OF_INVALID_INIT_METHOD
}
- (instancetype)initWithStream: (OFStream *)stream
mode: (OFString *)mode
{
self = [super init];
@try {
if (![mode isEqual: @"r"])
@throw [OFNotImplementedException
exceptionWithSelector: _cmd
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#import "OFNotOpenException.h"
#import "OFTruncatedDataException.h"
@implementation OFGZIPStream
@synthesize operatingSystemMadeOn = _operatingSystemMadeOn;
@synthesize modificationDate = _modificationDate;
+ (instancetype)streamWithStream: (OFStream *)stream mode: (OFString *)mode
{
return [[[self alloc] initWithStream: stream mode: mode] autorelease];
}
- (instancetype)init
{
OF_INVALID_INIT_METHOD
}
- (instancetype)initWithStream: (OFStream *)stream mode: (OFString *)mode
{
self = [super init];
@try {
if (![mode isEqual: @"r"])
@throw [OFNotImplementedException
exceptionWithSelector: _cmd
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[_inflateStream release];
[_modificationDate release];
[super dealloc];
}
- (size_t)lowlevelReadIntoBuffer: (void *)buffer
length: (size_t)length
{
if (_stream == nil)
@throw [OFNotOpenException exceptionWithObject: self];
for (;;) {
uint8_t byte;
uint32_t CRC32, uncompressedSize;
if (_stream.atEndOfStream) {
if (_state != OF_GZIP_STREAM_ID1)
@throw [OFTruncatedDataException exception];
return 0;
}
switch (_state) {
case OF_GZIP_STREAM_ID1:
case OF_GZIP_STREAM_ID2:
case OF_GZIP_STREAM_COMPRESSION_METHOD:
if ([_stream readIntoBuffer: &byte
length: 1] < 1)
return 0;
if ((_state == OF_GZIP_STREAM_ID1 && byte != 0x1F) ||
(_state == OF_GZIP_STREAM_ID2 && byte != 0x8B) ||
(_state == OF_GZIP_STREAM_COMPRESSION_METHOD &&
byte != 8))
@throw [OFInvalidFormatException exception];
_state++;
break;
case OF_GZIP_STREAM_FLAGS:
if ([_stream readIntoBuffer: &byte
length: 1] < 1)
return 0;
_flags = byte;
_state++;
break;
case OF_GZIP_STREAM_MODIFICATION_TIME:
_bytesRead += [_stream
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[_inflateStream release];
[_modificationDate release];
[super dealloc];
}
- (size_t)lowlevelReadIntoBuffer: (void *)buffer length: (size_t)length
{
if (_stream == nil)
@throw [OFNotOpenException exceptionWithObject: self];
for (;;) {
uint8_t byte;
uint32_t CRC32, uncompressedSize;
if (_stream.atEndOfStream) {
if (_state != OF_GZIP_STREAM_ID1)
@throw [OFTruncatedDataException exception];
return 0;
}
switch (_state) {
case OF_GZIP_STREAM_ID1:
case OF_GZIP_STREAM_ID2:
case OF_GZIP_STREAM_COMPRESSION_METHOD:
if ([_stream readIntoBuffer: &byte length: 1] < 1)
return 0;
if ((_state == OF_GZIP_STREAM_ID1 && byte != 0x1F) ||
(_state == OF_GZIP_STREAM_ID2 && byte != 0x8B) ||
(_state == OF_GZIP_STREAM_COMPRESSION_METHOD &&
byte != 8))
@throw [OFInvalidFormatException exception];
_state++;
break;
case OF_GZIP_STREAM_FLAGS:
if ([_stream readIntoBuffer: &byte length: 1] < 1)
return 0;
_flags = byte;
_state++;
break;
case OF_GZIP_STREAM_MODIFICATION_TIME:
_bytesRead += [_stream
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(_buffer[3] << 24) | (_buffer[2] << 16) |
(_buffer[1] << 8) | _buffer[0]];
_bytesRead = 0;
_state++;
break;
case OF_GZIP_STREAM_EXTRA_FLAGS:
if ([_stream readIntoBuffer: &byte
length: 1] < 1)
return 0;
_extraFlags = byte;
_state++;
break;
case OF_GZIP_STREAM_OPERATING_SYSTEM:
if ([_stream readIntoBuffer: &byte
length: 1] < 1)
return 0;
_operatingSystemMadeOn = byte;
_state++;
break;
case OF_GZIP_STREAM_EXTRA_LENGTH:
if (!(_flags & OF_GZIP_STREAM_FLAG_EXTRA)) {
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(_buffer[3] << 24) | (_buffer[2] << 16) |
(_buffer[1] << 8) | _buffer[0]];
_bytesRead = 0;
_state++;
break;
case OF_GZIP_STREAM_EXTRA_FLAGS:
if ([_stream readIntoBuffer: &byte length: 1] < 1)
return 0;
_extraFlags = byte;
_state++;
break;
case OF_GZIP_STREAM_OPERATING_SYSTEM:
if ([_stream readIntoBuffer: &byte length: 1] < 1)
return 0;
_operatingSystemMadeOn = byte;
_state++;
break;
case OF_GZIP_STREAM_EXTRA_LENGTH:
if (!(_flags & OF_GZIP_STREAM_FLAG_EXTRA)) {
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