buf

package
v2.10.3+incompatible Latest Latest
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 Go to latest Published: Dec 13, 2016 License: MIT Imports: 5 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 = 8 * 1024
	// Size of a small buffer.
	SizeSmall = 2 * 1024

	PoolSizeEnvKey = "v2ray.buffer.size"
)

Variables

This section is empty.

Functions

func Pipe 

func Pipe(reader Reader, writer Writer) error

Pipe dumps all content from reader to writer, until an error happens.

func PipeUntilEOF 

func PipeUntilEOF(reader Reader, writer Writer) error

PipeUntilEOF behaves the same as Pipe(). The only difference is PipeUntilEOF returns nil on 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 8K bytes of arbitrary content.

func NewLocal 

func NewLocal(size int) *Buffer

NewLocal creates and returns a buffer on current thread.

func NewSmall 

func NewSmall() *Buffer

NewSmall returns a buffer with 2K bytes capacity.

func (*Buffer) Append 

func (b *Buffer) Append(data []byte)

Append appends a byte array to the end of the buffer.

func (*Buffer) AppendBytes 

func (b *Buffer) AppendBytes(bytes ...byte)

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 int) 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 int) []byte

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

func (*Buffer) BytesRange 

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

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

func (*Buffer) BytesTo 

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

BytesFrom 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() int

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) SetByte 

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

SetByte sets the byte value at index.

func (*Buffer) Slice 

func (b *Buffer) Slice(from, to int)

Slice cuts the buffer at the given position.

func (*Buffer) SliceFrom 

func (b *Buffer) SliceFrom(from int)

SliceFrom cuts the buffer at the given position.

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 BufferPool 

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

BufferPool is a Pool that utilizes an internal cache.

func NewBufferPool 

func NewBufferPool(bufferSize, poolSize uint32) *BufferPool

NewBufferPool creates a new BufferPool with given buffer size, and internal cache size.

func (*BufferPool) Allocate 

func (p *BufferPool) Allocate() *Buffer

Allocate implements Pool.Allocate().

func (*BufferPool) Free 

func (p *BufferPool) Free(buffer *Buffer)

Free implements Pool.Free().

type BufferToBytesReader 

type BufferToBytesReader struct {
	sync.Mutex
	// contains filtered or unexported fields
}

func NewBytesReader 

func NewBytesReader(stream Reader) *BufferToBytesReader

func (*BufferToBytesReader) Fill 

func (v *BufferToBytesReader) Fill()

Private: Visible for testing.

func (*BufferToBytesReader) Read 

func (v *BufferToBytesReader) Read(b []byte) (int, error)

func (*BufferToBytesReader) Release 

func (v *BufferToBytesReader) Release()

type BufferToBytesWriter 

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

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

func (*BufferToBytesWriter) Release 

func (v *BufferToBytesWriter) Release()

Release implements Releasable.Release().

func (*BufferToBytesWriter) Write 

func (v *BufferToBytesWriter) Write(buffer *Buffer) error

Write implements Writer.Write(). Write() takes ownership of the given buffer.

type BytesToBufferReader 

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

BytesToBufferReader is a Reader that adjusts its reading speed automatically.

func (*BytesToBufferReader) Read 

func (v *BytesToBufferReader) Read() (*Buffer, error)

Read implements Reader.Read().

func (*BytesToBufferReader) Release 

func (v *BytesToBufferReader) Release()

Release implements Releasable.Release().

type BytesToBufferWriter 

type BytesToBufferWriter struct {
	sync.Mutex
	// contains filtered or unexported fields
}

func NewBytesWriter 

func NewBytesWriter(writer Writer) *BytesToBufferWriter

func (*BytesToBufferWriter) Release 

func (v *BytesToBufferWriter) Release()

func (*BytesToBufferWriter) Write 

func (v *BytesToBufferWriter) Write(payload []byte) (int, error)

type Pool 

type Pool interface {
	// Allocate either returns a unused buffer from the pool, or generates a new one from system.
	Allocate() *Buffer
	// Free recycles the given buffer.
	Free(*Buffer)
}

Pool provides functionality to generate and recycle buffers on demand.

type Reader 

type Reader interface {
	Release()
	// Read reads content from underlying reader, and put it into an alloc.Buffer.
	Read() (*Buffer, error)
}

Reader extends io.Reader with alloc.Buffer.

func NewReader 

func NewReader(reader io.Reader) Reader

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

type Supplier 

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

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

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 int) Supplier

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

type SyncPool 

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

SyncPool is a buffer pool based on sync.Pool

func NewSyncPool 

func NewSyncPool(bufferSize uint32) *SyncPool

NewSyncPool creates a SyncPool with given buffer size.

func (*SyncPool) Allocate 

func (p *SyncPool) Allocate() *Buffer

Allocate implements Pool.Allocate().

func (*SyncPool) Free 

func (p *SyncPool) Free(buffer *Buffer)

Free implements Pool.Free().

type Writer 

type Writer interface {
	Release()
	// Write writes an alloc.Buffer into underlying writer.
	Write(*Buffer) error
}

Writer extends io.Writer with alloc.Buffer.

func NewWriter 

func NewWriter(writer io.Writer) Writer

NewWriter creates a new Writer.

Source Files

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