/*
* Copyright (c) 2008-2022 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#include "config.h"
#include <errno.h>
#import "OFMemoryStream.h"
#import "OFInvalidArgumentException.h"
#import "OFOutOfRangeException.h"
#import "OFWriteFailedException.h"
#import "OFSeekFailedException.h"
@implementation OFMemoryStream
+ (instancetype)streamWithMemoryAddress: (void *)address
size: (size_t)size
writable: (bool)writable
{
return [[[self alloc] initWithMemoryAddress: address
size: size
writable: writable] autorelease];
}
- (instancetype)init
{
OF_INVALID_INIT_METHOD
}
- (instancetype)initWithMemoryAddress: (void *)address
size: (size_t)size
writable: (bool)writable
{
self = [super init];
@try {
if (size > SSIZE_MAX || (ssize_t)size != (OFStreamOffset)size)
@throw [OFOutOfRangeException exception];
_address = address;
_size = size;
_writable = writable;
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (size_t)lowlevelReadIntoBuffer: (void *)buffer length: (size_t)length
{
if (SIZE_MAX - _position < length || _position + length > _size)
length = _size - _position;
memcpy(buffer, _address + _position, length);
_position += length;
return length;
}
- (size_t)lowlevelWriteBuffer: (const void *)buffer length: (size_t)length
{
size_t bytesWritten = length;
if (!_writable)
@throw [OFWriteFailedException exceptionWithObject: self
requestedLength: length
bytesWritten: 0
errNo: EBADF];
if (SIZE_MAX - _position < length || _position + length > _size)
bytesWritten = _size - _position;
memcpy(_address + _position, buffer, bytesWritten);
_position += bytesWritten;
if (bytesWritten != length)
@throw [OFWriteFailedException exceptionWithObject: self
requestedLength: length
bytesWritten: bytesWritten
errNo: EFBIG];
return bytesWritten;
}
- (bool)lowlevelIsAtEndOfStream
{
return (_position == _size);
}
- (OFStreamOffset)lowlevelSeekToOffset: (OFStreamOffset)offset
whence: (OFSeekWhence)whence
{
OFStreamOffset new;
switch (whence) {
case OFSeekSet:
new = offset;
break;
case OFSeekCurrent:
new = (OFStreamOffset)_position + offset;
break;
case OFSeekEnd:
new = (OFStreamOffset)_size + offset;
break;
default:
@throw [OFInvalidArgumentException exception];
}
if (new < 0 || new > (OFStreamOffset)_size)
@throw [OFSeekFailedException exceptionWithStream: self
offset: offset
whence: whence
errNo: EINVAL];
return (_position = (size_t)new);
}
@end