package fasthttp

import (
	
	
	
	

	
)

type headerInterface interface {
	ContentLength() int
	ReadTrailer(r *bufio.Reader) error
}

type requestStream struct {
	header          headerInterface
	prefetchedBytes *bytes.Reader
	reader          *bufio.Reader
	totalBytesRead  int
	chunkLeft       int
}

func ( *requestStream) ( []byte) (int, error) {
	var (
		   int
		 error
	)
	if .header.ContentLength() == -1 {
		if .chunkLeft == 0 {
			,  := parseChunkSize(.reader)
			if  != nil {
				return 0, 
			}
			if  == 0 {
				 = .header.ReadTrailer(.reader)
				if  != nil &&  != io.EOF {
					return 0, 
				}
				return 0, io.EOF
			}
			.chunkLeft = 
		}
		 := len()
		if .chunkLeft < len() {
			 = .chunkLeft
		}
		,  = .reader.Read([:])
		.totalBytesRead += 
		.chunkLeft -= 
		if  == io.EOF {
			 = io.ErrUnexpectedEOF
		}
		if  == nil && .chunkLeft == 0 {
			 = readCrLf(.reader)
		}
		return , 
	}
	if .totalBytesRead == .header.ContentLength() {
		return 0, io.EOF
	}
	 := int(.prefetchedBytes.Size())
	if  > .totalBytesRead {
		 :=  - .totalBytesRead
		if len() >  {
			 = [:]
		}
		,  := .prefetchedBytes.Read()
		.totalBytesRead += 
		if  == .header.ContentLength() {
			return , io.EOF
		}
		return , 
	}
	 := .header.ContentLength() - .totalBytesRead
	if len() >  {
		 = [:]
	}
	,  = .reader.Read()
	.totalBytesRead += 
	if  != nil {
		return , 
	}

	if .totalBytesRead == .header.ContentLength() {
		 = io.EOF
	}
	return , 
}

func acquireRequestStream( *bytebufferpool.ByteBuffer,  *bufio.Reader,  headerInterface) *requestStream {
	 := requestStreamPool.Get().(*requestStream)
	.prefetchedBytes = bytes.NewReader(.B)
	.reader = 
	.header = 
	return 
}

func releaseRequestStream( *requestStream) {
	.prefetchedBytes = nil
	.totalBytesRead = 0
	.chunkLeft = 0
	.reader = nil
	.header = nil
	requestStreamPool.Put()
}

var requestStreamPool = sync.Pool{
	New: func() interface{} {
		return &requestStream{}
	},
}