buf

package
v3.19.1+incompatible Latest Latest
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 Go to latest Published: Apr 20, 2018 License: MIT Imports: 8 Imported by: 0

Documentation

Overview

Package buf provides a light-weight memory allocation mechanism.

Index

Constants

View Source 
const (
	// Size of a regular buffer.
	Size = 2 * 1024
)

Variables

View Source 
var ErrReadTimeout = newError("IO timeout")

ErrReadTimeout is an error that happens with IO timeout.

Functions

func Copy 

func Copy(reader Reader, writer Writer, options ...CopyOption) error

Copy dumps all payload from reader to writer or stops when an error occurs. It returns nil when EOF.

func ReadAllToBytes 

func ReadAllToBytes(reader io.Reader) ([]byte, error)

ReadAllToBytes reads all content from the reader into a byte array, until EOF.

Types

type Buffer 

type Buffer struct {
	// contains filtered or unexported fields
}

Buffer is a recyclable allocation of a byte array. Buffer.Release() recycles the buffer into an internal buffer pool, in order to recreate a buffer more quickly.

func New 

func New() *Buffer

New creates a Buffer with 0 length and 2K capacity.

func NewSize 

func NewSize(capacity int32) *Buffer

NewSize creates and returns a buffer with 0 length and at least the given capacity. Capacity must be positive.

func (*Buffer) Advance 

func (b *Buffer) Advance(from int32)

Advance cuts the buffer at the given position.

func (*Buffer) AppendBytes 

func (b *Buffer) AppendBytes(bytes ...byte) (int, error)

AppendBytes appends one or more bytes to the end of the buffer.

func (*Buffer) AppendSupplier 

func (b *Buffer) AppendSupplier(writer Supplier) error

AppendSupplier appends the content of a BytesWriter to the buffer.

func (*Buffer) Byte 

func (b *Buffer) Byte(index int32) byte

Byte returns the bytes at index.

func (*Buffer) Bytes 

func (b *Buffer) Bytes() []byte

Bytes returns the content bytes of this Buffer.

func (*Buffer) BytesFrom 

func (b *Buffer) BytesFrom(from int32) []byte

BytesFrom returns a slice of this Buffer starting from the given position.

func (*Buffer) BytesRange 

func (b *Buffer) BytesRange(from, to int32) []byte

BytesRange returns a slice of this buffer with given from and to boundary.

func (*Buffer) BytesTo 

func (b *Buffer) BytesTo(to int32) []byte

BytesTo returns a slice of this Buffer from start to the given position.

func (*Buffer) Clear 

func (b *Buffer) Clear()

Clear clears the content of the buffer, results an empty buffer with Len() = 0.

func (*Buffer) IsEmpty 

func (b *Buffer) IsEmpty() bool

IsEmpty returns true if the buffer is empty.

func (*Buffer) IsFull 

func (b *Buffer) IsFull() bool

IsFull returns true if the buffer has no more room to grow.

func (*Buffer) Len 

func (b *Buffer) Len() int32

Len returns the length of the buffer content.

func (*Buffer) Read 

func (b *Buffer) Read(data []byte) (int, error)

Read implements io.Reader.Read().

func (*Buffer) Release 

func (b *Buffer) Release()

Release recycles the buffer into an internal buffer pool.

func (*Buffer) Reset 

func (b *Buffer) Reset(writer Supplier) error

Reset resets the content of the Buffer with a supplier.

func (*Buffer) Resize 

func (b *Buffer) Resize(from, to int32)

Resize cuts the buffer at the given position.

func (*Buffer) SetByte 

func (b *Buffer) SetByte(index int32, value byte)

SetByte sets the byte value at index.

func (*Buffer) String 

func (b *Buffer) String() string

String returns the string form of this Buffer.

func (*Buffer) Write 

func (b *Buffer) Write(data []byte) (int, error)

Write implements Write method in io.Writer.

type BufferToBytesWriter 

type BufferToBytesWriter struct {
	io.Writer
}

BufferToBytesWriter is a Writer that writes alloc.Buffer into underlying writer.

func NewBufferToBytesWriter 

func NewBufferToBytesWriter(writer io.Writer) *BufferToBytesWriter

NewBufferToBytesWriter returns a new BufferToBytesWriter.

func (*BufferToBytesWriter) ReadFrom 

func (w *BufferToBytesWriter) ReadFrom(reader io.Reader) (int64, error)

ReadFrom implements io.ReaderFrom.

func (*BufferToBytesWriter) WriteMultiBuffer 

func (w *BufferToBytesWriter) WriteMultiBuffer(mb MultiBuffer) error

WriteMultiBuffer implements Writer. This method takes ownership of the given buffer.

type BufferedReader 

type BufferedReader struct {
	// contains filtered or unexported fields
}

BufferedReader is a Reader that keeps its internal buffer.

func NewBufferedReader 

func NewBufferedReader(reader Reader) *BufferedReader

NewBufferedReader returns a new BufferedReader.

func (*BufferedReader) BufferedBytes 

func (r *BufferedReader) BufferedBytes() int32

BufferedBytes returns the number of bytes that is cached in this reader.

func (*BufferedReader) Close 

func (r *BufferedReader) Close() error

Close implements io.Closer.

func (*BufferedReader) IsBuffered 

func (r *BufferedReader) IsBuffered() bool

IsBuffered returns true if internal buffer is used.

func (*BufferedReader) Read 

func (r *BufferedReader) Read(b []byte) (int, error)

Read implements io.Reader. It reads from internal buffer first (if available) and then reads from the underlying reader.

func (*BufferedReader) ReadAtMost 

func (r *BufferedReader) ReadAtMost(size int32) (MultiBuffer, error)

ReadAtMost returns a MultiBuffer with at most size.

func (*BufferedReader) ReadByte 

func (r *BufferedReader) ReadByte() (byte, error)

ReadByte implements io.ByteReader.

func (*BufferedReader) ReadMultiBuffer 

func (r *BufferedReader) ReadMultiBuffer() (MultiBuffer, error)

ReadMultiBuffer implements Reader.

func (*BufferedReader) SetBuffered 

func (r *BufferedReader) SetBuffered(f bool)

SetBuffered sets whether to keep the interal buffer.

func (*BufferedReader) WriteTo 

func (r *BufferedReader) WriteTo(writer io.Writer) (int64, error)

WriteTo implements io.WriterTo.

type BufferedWriter 

type BufferedWriter struct {
	// contains filtered or unexported fields
}

BufferedWriter is a Writer with internal buffer.

func NewBufferedWriter 

func NewBufferedWriter(writer Writer) *BufferedWriter

NewBufferedWriter creates a new BufferedWriter.

func (*BufferedWriter) Close 

func (w *BufferedWriter) Close() error

Close implements io.Closable.

func (*BufferedWriter) Flush 

func (w *BufferedWriter) Flush() error

Flush flushes buffered content into underlying writer.

func (*BufferedWriter) ReadFrom 

func (w *BufferedWriter) ReadFrom(reader io.Reader) (int64, error)

ReadFrom implements io.ReaderFrom.

func (*BufferedWriter) SetBuffered 

func (w *BufferedWriter) SetBuffered(f bool) error

SetBuffered sets whether the internal buffer is used. If set to false, Flush() will be called to clear the buffer.

func (*BufferedWriter) Write 

func (w *BufferedWriter) Write(b []byte) (int, error)

Write implements io.Writer.

func (*BufferedWriter) WriteByte 

func (w *BufferedWriter) WriteByte(c byte) error

WriteByte implements io.ByteWriter.

func (*BufferedWriter) WriteMultiBuffer 

func (w *BufferedWriter) WriteMultiBuffer(b MultiBuffer) error

WriteMultiBuffer implements Writer. It takes ownership of the given MultiBuffer.

type BytesToBufferReader 

type BytesToBufferReader struct {
	io.Reader
	// contains filtered or unexported fields
}

BytesToBufferReader is a Reader that adjusts its reading speed automatically.

func (*BytesToBufferReader) ReadMultiBuffer 

func (r *BytesToBufferReader) ReadMultiBuffer() (MultiBuffer, error)

ReadMultiBuffer implements Reader.

type CopyOption 

type CopyOption func(*copyHandler)

CopyOption is an option for copying data.

func CountSize 

func CountSize(sc *SizeCounter) CopyOption

CountSize is a CopyOption that sums the total size of data copied into the given SizeCounter.

func IgnoreReaderError 

func IgnoreReaderError() CopyOption

IgnoreReaderError is a CopyOption that ignores errors from reader. Copy will continue in such case.

func IgnoreWriterError 

func IgnoreWriterError() CopyOption

IgnoreWriterError is a CopyOption that ignores errors from writer. Copy will continue in such case.

func UpdateActivity 

func UpdateActivity(timer signal.ActivityUpdater) CopyOption

UpdateActivity is a CopyOption to update activity on each data copy operation.

type MultiBuffer 

type MultiBuffer []*Buffer

MultiBuffer is a list of Buffers. The order of Buffer matters.

func NewMultiBufferCap 

func NewMultiBufferCap(capacity int32) MultiBuffer

NewMultiBufferCap creates a new MultiBuffer instance.

func NewMultiBufferValue 

func NewMultiBufferValue(b ...*Buffer) MultiBuffer

NewMultiBufferValue wraps a list of Buffers into MultiBuffer.

func ReadAllToMultiBuffer 

func ReadAllToMultiBuffer(reader io.Reader) (MultiBuffer, error)

ReadAllToMultiBuffer reads all content from the reader into a MultiBuffer, until EOF.

func ReadSizeToMultiBuffer 

func ReadSizeToMultiBuffer(reader io.Reader, size int32) (MultiBuffer, error)

ReadSizeToMultiBuffer reads specific number of bytes from reader into a MultiBuffer.

func (*MultiBuffer) Append 

func (mb *MultiBuffer) Append(buf *Buffer)

Append appends buffer to the end of this MultiBuffer

func (*MultiBuffer) AppendMulti 

func (mb *MultiBuffer) AppendMulti(buf MultiBuffer)

AppendMulti appends a MultiBuffer to the end of this one.

func (MultiBuffer) Copy 

func (mb MultiBuffer) Copy(b []byte) int

Copy copied the beginning part of the MultiBuffer into the given byte array.

func (MultiBuffer) IsEmpty 

func (mb MultiBuffer) IsEmpty() bool

IsEmpty return true if the MultiBuffer has no content.

func (*MultiBuffer) Len 

func (mb *MultiBuffer) Len() int32

Len returns the total number of bytes in the MultiBuffer.

func (*MultiBuffer) Read 

func (mb *MultiBuffer) Read(b []byte) (int, error)

Read implements io.Reader.

func (*MultiBuffer) ReadFrom 

func (mb *MultiBuffer) ReadFrom(reader io.Reader) (int64, error)

ReadFrom implements io.ReaderFrom.

func (*MultiBuffer) Release 

func (mb *MultiBuffer) Release()

Release releases all Buffers in the MultiBuffer.

func (*MultiBuffer) SliceBySize 

func (mb *MultiBuffer) SliceBySize(size int32) MultiBuffer

SliceBySize splits the beginning of this MultiBuffer into another one, for at most size bytes.

func (*MultiBuffer) SplitFirst 

func (mb *MultiBuffer) SplitFirst() *Buffer

SplitFirst splits out the first Buffer in this MultiBuffer.

func (MultiBuffer) String 

func (mb MultiBuffer) String() string

func (MultiBuffer) ToNetBuffers 

func (mb MultiBuffer) ToNetBuffers() net.Buffers

ToNetBuffers converts this MultiBuffer to net.Buffers. The return net.Buffers points to the same content of the MultiBuffer.

func (*MultiBuffer) Write 

func (mb *MultiBuffer) Write(b []byte) (int, error)

Write implements io.Writer.

func (*MultiBuffer) WriteMultiBuffer 

func (mb *MultiBuffer) WriteMultiBuffer(b MultiBuffer) error

WriteMultiBuffer implements Writer.

func (*MultiBuffer) WriteTo 

func (mb *MultiBuffer) WriteTo(writer io.Writer) (int64, error)

WriteTo implements io.WriterTo.

type Reader 

type Reader interface {
	// ReadMultiBuffer reads content from underlying reader, and put it into a MultiBuffer.
	ReadMultiBuffer() (MultiBuffer, error)
}

Reader extends io.Reader with MultiBuffer.

func NewBytesToBufferReader 

func NewBytesToBufferReader(reader io.Reader) Reader

NewBytesToBufferReader returns a new BytesToBufferReader.

func NewReader 

func NewReader(reader io.Reader) Reader

NewReader creates a new Reader. The Reader instance doesn't take the ownership of reader.

type SizeCounter 

type SizeCounter struct {
	Size int64
}

SizeCounter is for counting bytes copied by Copy().

type Supplier 

type Supplier func([]byte) (int, error)

Supplier is a writer that writes contents into the given buffer.

func ReadAtLeastFrom 

func ReadAtLeastFrom(reader io.Reader, size int) Supplier

ReadAtLeastFrom create a Supplier to read at least size bytes from the given io.Reader.

func ReadFrom 

func ReadFrom(reader io.Reader) Supplier

ReadFrom creates a Supplier to read from a given io.Reader.

func ReadFullFrom 

func ReadFullFrom(reader io.Reader, size int32) Supplier

ReadFullFrom creates a Supplier to read full buffer from a given io.Reader.

type TimeoutReader 

type TimeoutReader interface {
	ReadTimeout(time.Duration) (MultiBuffer, error)
}

TimeoutReader is a reader that returns error if Read() operation takes longer than the given timeout.

type Writer 

type Writer interface {
	// WriteMultiBuffer writes a MultiBuffer into underlying writer.
	WriteMultiBuffer(MultiBuffer) error
}

Writer extends io.Writer with MultiBuffer. 

var (
	// Discard is a Writer that swallows all contents written in.
	Discard Writer = noOpWriter(0)

	// DiscardBytes is an io.Writer that swallows all contents written in.
	DiscardBytes io.Writer = noOpWriter(0)
)

func NewSequentialWriter 

func NewSequentialWriter(writer io.Writer) Writer

NewSequentialWriter returns a Writer that write Buffers in a MultiBuffer sequentially.

func NewWriter 

func NewWriter(writer io.Writer) Writer

NewWriter creates a new Writer.

Source Files

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