mirror of
https://github.com/samsonjs/arq_restore.git
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125 lines
4.1 KiB
Objective-C
125 lines
4.1 KiB
Objective-C
/*
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Copyright (c) 2009-2017, Haystack Software LLC https://www.arqbackup.com
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the names of PhotoMinds LLC or Haystack Software, nor the names of
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their contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#import "FileInputStream.h"
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#import "InputStreams.h"
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#define MY_BUF_SIZE (4096)
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@interface FileInputStream (internal)
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- (void)close;
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@end
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@implementation FileInputStream
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- (id)initWithPath:(NSString *)thePath offset:(unsigned long long)theOffset length:(unsigned long long)theLength {
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if (self = [super init]) {
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fd = -1;
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path = [thePath retain];
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fileLength = theOffset + theLength;
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offset = theOffset;
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}
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return self;
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}
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- (void)dealloc {
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[self close];
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[path release];
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[super dealloc];
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}
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#pragma mark InputStream
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- (NSInteger)read:(unsigned char *)buf bufferLength:(NSUInteger)bufferLength error:(NSError **)error {
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if (fd == -1) {
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fd = open([path fileSystemRepresentation], O_RDONLY|O_NOFOLLOW);
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if (fd == -1) {
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int errnum = errno;
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HSLogError(@"open(%@) error %d: %s", path, errnum, strerror(errnum));
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SETNSERROR(@"UnixErrorDomain", errnum, @"failed to open %@: %s", path, strerror(errnum));
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return -1;
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}
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if (offset > 0) {
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if (lseek(fd, (off_t)offset, SEEK_SET) == -1) {
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int errnum = errno;
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HSLogError(@"lseek(%@, %qu) error %d: %s", path, offset, errnum, strerror(errnum));
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SETNSERROR(@"UnixErrorDomain", errnum, @"failed to seek to %qu in %@: %s", offset, path, strerror(errnum));
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return -1;
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}
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}
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}
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unsigned long long fileRemaining = fileLength - offset;
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unsigned long long toRead = fileRemaining > bufferLength ? bufferLength : fileRemaining;
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if (toRead == 0) {
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return 0;
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}
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NSInteger ret = 0;
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read_again:
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ret = read(fd, buf, (size_t)toRead);
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if ((ret == -1) && (errno == EINTR)) {
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goto read_again;
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}
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if (ret < 0) {
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int errnum = errno;
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HSLogError(@"read(%@) error %d: %s", path, errnum, strerror(errnum));
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SETNSERROR(@"UnixErrorDomain", errnum, @"failed to read from %@: %s", path, strerror(errnum));
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} else {
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offset += ret;
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}
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return ret;
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}
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- (NSData *)slurp:(NSError **)error {
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return [InputStreams slurp:self error:error];
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}
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- (BOOL)slurpIntoBuffer:(NSMutableData *)theBuffer error:(NSError **)error {
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return [InputStreams slurp:self intoBuffer:theBuffer error:error];
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}
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#pragma mark NSObject protocol
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- (NSString *)description {
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return [NSString stringWithFormat:@"<FileInputStream: offset=%qu,length=%qu,path=%@>", offset, fileLength, path];
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}
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@end
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@implementation FileInputStream (internal)
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- (void)close {
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if (fd != -1) {
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close(fd);
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fd = -1;
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}
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}
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@end
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