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buffer.go
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buffer.go
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package linkedbuffer
import (
"github.com/itsabgr/fastbuffer/pkg/bufferq"
"github.com/itsabgr/go-bytespool"
"io"
"sync"
)
type Buffer struct {
readMutex sync.Mutex
bufferQ bufferq.Q
offset uint
}
func (r *Buffer) Write(src []byte) (n int,err error){
for n < len(src){
dst := bytespool.Pull(uint(len(src) - n))
n += copy(dst,src[n:])
err = r.Push(dst)
if err!=nil{
return n,err
}
}
return
}
func (r *Buffer) Push(data []byte) error{
r.bufferQ.Push(data)
return nil
}
func (r *Buffer) Len() uint{
return r.bufferQ.Len()
}
func (r *Buffer) Flush() {
r.readMutex.Lock()
defer r.readMutex.Unlock()
r.bufferQ.Reset()
r.offset = 0
}
func (r *Buffer) Read(dst []byte) (int,error){
r.readMutex.Lock()
defer r.readMutex.Unlock()
src := r.bufferQ.Peek()
if src == nil{
return 0,io.EOF
}
src = src[r.offset:]
n := copy(dst,src)
if n == len(src){
r.bufferQ.Pull()
}else{
r.offset += uint(n)
}
return n,nil
}
func (r *Buffer) Pull() ([]byte,error){
r.readMutex.Lock()
defer r.readMutex.Unlock()
b := r.bufferQ.Pull()
if b == nil{
return nil,io.EOF
}
b = b[r.offset:]
r.offset = 0
return b,nil
}
func (r *Buffer) Peek(dst []byte) (int,error){
r.readMutex.Lock()
defer r.readMutex.Unlock()
src := r.bufferQ.Peek()
if src == nil{
return 0,io.EOF
}
src = src[r.offset:]
return copy(dst,src),nil
}
func (r *Buffer) Discard(n uint) (discarded uint,err error){
r.readMutex.Lock()
defer r.readMutex.Unlock()
for discarded < n{
b := r.bufferQ.Peek()
if b == nil {
return discarded, io.EOF
}
b = b[r.offset:]
if uint(len(b)) > n - discarded{
r.offset += n - discarded
break
}else{
r.bufferQ.Pull()
r.offset = 0
}
}
return discarded,nil
}