ITByteStream.m

   1 //
   2 //  ITByteStream.h
   3 //  ITFoundation
   4 //
   5 //  Created by Alexander Strange on Thu Feb 27 2003.
   6 //  Copyright (c) 2003 __MyCompanyName__. All rights reserved.
   7 //
   8
   9 #import "ITByteStream.h"
  10
  11 // TODO: Add NSCopying/NSCoding support. Blocking reads (how would this work? NSConditionLock?)
  12
  13 @implementation ITByteStream
  14 -(id) init
  15 {
  16     if (self == [super init])
  17            {
  18            data = [[NSMutableData alloc] init];
  19            lock = [[NSLock alloc] init];
  20            delegate = nil;
  21            }
  22     return self;
  23 }
  24
  25 -(id) initWithDelegate:(id)d
  26 {
  27     if (self == [super init])
  28            {
  29            data = [[NSMutableData alloc] init];
  30            lock = [[NSLock alloc] init];
  31            delegate = [d retain];
  32            }
  33     return self;
  34 }
  35
  36 -(id) initWithStream:(ITByteStream*)stream delegate:(id)d
  37 {
  38     if (self == [super init])
  39            {
  40            data = [stream->data copy];
  41            lock = [[NSLock alloc] init];
  42            delegate = [d retain];
  43            }
  44     return 0;
  45 }
  46
  47 -(oneway void) dealloc
  48 {
  49     [lock lock];
  50     [data release];
  51     [lock unlock];
  52     [lock release];
  53     [super dealloc];
  54 }
  55
  56 -(void) setDelegate:(id <ITByteStreamDelegate>)d
  57 {
  58     [delegate release];
  59     delegate = [d retain];
  60 }
  61
  62 -(int) availableDataLength
  63 {
  64     int len;
  65     [lock lock];
  66     len = [data length];
  67     [lock unlock];
  68     return len;
  69 }
  70
  71 -(NSData*) readDataOfLength:(int)length
  72 {
  73     NSData *ret, *tmp;
  74     NSRange range = {0, length};
  75     [lock lock];
  76     ret = [data subdataWithRange:range];
  77 #if MAC_OS_X_VERSION_10_2 <= MAC_OS_X_VERSION_MAX_ALLOWED
  78     [data replaceBytesInRange:range withBytes:nil length:0];
  79 #else
  80     range = {length, [data length]};
  81     tmp = [data subdataWithRange:range];
  82     [data setData:tmp];
  83 #endif
  84     [lock unlock];
  85     return ret;
  86 }
  87
  88 -(NSData*) readAllData
  89 {
  90     NSData *ret;
  91     [lock lock];
  92     ret = [data autorelease];
  93     data = [[NSMutableData alloc] init];
  94     [lock unlock];
  95     return ret;
  96 }
  97
  98 -(void) writeData:(in NSData*)_data
  99 {
 100     [lock lock];
 101     [data appendData:_data];
 102     [lock unlock];
 103     [delegate newDataAdded:self];
 104 }
 105
 106 -(void) writeBytes:(char *)b len:(long)length
 107 {
 108     [lock lock];
 109     [data appendBytes:b length:length];
 110     [lock unlock];
 111     [delegate newDataAdded:self];
 112 }
 113 @end