ReadBuffer
class ReadBuffer:MemoryBuffer
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public var offset = 0
override public init(data: Data) {
super.init(data: data)
}
public init(memory: UnsafeMutableRawPointer, length: Int, freeWhenDone: Bool) {
super.init(memory: memory, capacity: length, length: length, freeWhenDone: freeWhenDone)
}
// init with memory buffer without copy
public init(memoryBufferNoCopy: MemoryBuffer) {
super.init(memory: memoryBufferNoCopy.memory, capacity: memoryBufferNoCopy.length, length: memoryBufferNoCopy.length, freeWhenDone: false)
}
// [Data initWithBytesNoCopy:count]
public func dataNoCopy() -> Data {
return Data(bytesNoCopy: self.memory.assumingMemoryBound(to: UInt8.self), count: self.length, deallocator: .none)
}
// copy self.memory.advanced(by: self.offset) to data + offset
public func read(_ data: UnsafeMutableRawPointer, offset: Int, length: Int) {
memcpy(data + offset, self.memory.advanced(by: self.offset), length)
self.offset += length
}
// skip length bytes
// move offset length forward
public func skip(_ length: Int) {
self.offset += length
}
// reset offset to zero position
public func reset() {
self.offset = 0
}
// create a new readbuffer with shared memory
public func sharedBufferNoCopy() -> ReadBuffer {
return ReadBuffer(memory: memory, length: length, freeWhenDone: false)
}