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/* Copyright 2014 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if !defined(__has_feature) || !__has_feature(objc_arc)
#error "This file requires ARC support."
#endif
#import "GTMGatherInputStream.h"
@implementation GTMGatherInputStream {
NSArray *_dataArray; // NSDatas that should be "gathered" and streamed.
NSUInteger _arrayIndex; // Index in the array of the current NSData.
long long _dataOffset; // Offset in the current NSData we are processing.
NSStreamStatus _streamStatus;
id<NSStreamDelegate> __weak _delegate; // Stream delegate, defaults to self.
}
+ (NSInputStream *)streamWithArray:(NSArray *)dataArray {
return [(GTMGatherInputStream *)[self alloc] initWithArray:dataArray];
}
- (instancetype)initWithArray:(NSArray *)dataArray {
self = [super init];
if (self) {
_dataArray = dataArray;
_delegate = self; // An NSStream's default delegate should be self.
}
return self;
}
#pragma mark - NSStream
- (void)open {
_arrayIndex = 0;
_dataOffset = 0;
_streamStatus = NSStreamStatusOpen;
}
- (void)close {
_streamStatus = NSStreamStatusClosed;
}
- (id<NSStreamDelegate>)delegate {
return _delegate;
}
- (void)setDelegate:(id<NSStreamDelegate>)delegate {
if (delegate == nil) {
_delegate = self;
} else {
_delegate = delegate;
}
}
- (id)propertyForKey:(NSString *)key {
if ([key isEqual:NSStreamFileCurrentOffsetKey]) {
return @([self absoluteOffset]);
}
return nil;
}
- (BOOL)setProperty:(id)property forKey:(NSString *)key {
if ([key isEqual:NSStreamFileCurrentOffsetKey]) {
NSNumber *absoluteOffsetNumber = property;
[self setAbsoluteOffset:absoluteOffsetNumber.longLongValue];
return YES;
}
return NO;
}
- (void)scheduleInRunLoop:(NSRunLoop *)aRunLoop forMode:(NSString *)mode {
}
- (void)removeFromRunLoop:(NSRunLoop *)aRunLoop forMode:(NSString *)mode {
}
- (NSStreamStatus)streamStatus {
return _streamStatus;
}
- (NSError *)streamError {
return nil;
}
#pragma mark - NSInputStream
- (NSInteger)read:(uint8_t *)buffer maxLength:(NSUInteger)len {
NSInteger bytesRead = 0;
NSUInteger bytesRemaining = len;
// Read bytes from the currently-indexed array.
while ((bytesRemaining > 0) && (_arrayIndex < _dataArray.count)) {
NSData *data = [_dataArray objectAtIndex:_arrayIndex];
NSUInteger dataLen = data.length;
NSUInteger dataBytesLeft = dataLen - (NSUInteger)_dataOffset;
NSUInteger bytesToCopy = MIN(bytesRemaining, dataBytesLeft);
NSRange range = NSMakeRange((NSUInteger) _dataOffset, bytesToCopy);
[data getBytes:(buffer + bytesRead) range:range];
bytesRead += bytesToCopy;
_dataOffset += bytesToCopy;
bytesRemaining -= bytesToCopy;
if (_dataOffset == (long long)dataLen) {
_dataOffset = 0;
_arrayIndex++;
}
}
if (_arrayIndex >= _dataArray.count) {
_streamStatus = NSStreamStatusAtEnd;
}
return bytesRead;
}
- (BOOL)getBuffer:(uint8_t **)buffer length:(NSUInteger *)len {
return NO; // We don't support this style of reading.
}
- (BOOL)hasBytesAvailable {
// If we return no, the read never finishes, even if we've already delivered all the bytes.
return YES;
}
#pragma mark - NSStreamDelegate
- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent {
id<NSStreamDelegate> delegate = _delegate;
if (delegate != self) {
[delegate stream:self handleEvent:streamEvent];
}
}
#pragma mark - Private
- (long long)absoluteOffset {
long long absoluteOffset = 0;
NSUInteger index = 0;
for (NSData *data in _dataArray) {
if (index >= _arrayIndex) {
break;
}
absoluteOffset += data.length;
++index;
}
absoluteOffset += _dataOffset;
return absoluteOffset;
}
- (void)setAbsoluteOffset:(long long)absoluteOffset {
if (absoluteOffset < 0) {
absoluteOffset = 0;
}
_arrayIndex = 0;
_dataOffset = absoluteOffset;
for (NSData *data in _dataArray) {
long long dataLen = (long long) data.length;
if (dataLen > _dataOffset) {
break;
}
_arrayIndex++;
_dataOffset -= dataLen;
}
if (_arrayIndex == _dataArray.count) {
if (_dataOffset > 0) {
_dataOffset = 0;
}
}
}
@end
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