using Base.Libc: errno, strerror, E2BIG, EINVAL, EILSEQ

import Base: close, eachline, eof, flush, isreadable, iswritable,

open, read, readbytes!, readline, readlines, readuntil, show, write

import Base: bytesavailable, close, eachline, eof, flush, isreadable, iswritable,

open, read, readavailable, readbytes!, readline, readlines,

readuntil, show, write

export StringEncoder, StringDecoder, encode, decode, encodings

export StringEncodingError, OutputBufferError, IConvError

eof(s)?throw(EOFError()): s.outbuf[s.skip+=1]

bytesavailable(s::StringDecoder)=

Int(BUFSIZE- s.outbytesleft[]- s.skip)

functionreadavailable(s::StringDecoder)

s.cd==C_NULL&&throw(ArgumentError("cannot read from closed StringDecoder"))

eof(s)# Load more data into buffer if it is empty

ob= s.outbytesleft[]

res= s.outbuf[(s.skip+1):(BUFSIZE- ob)]

s.skip= BUFSIZE- ob

return res

isreadable(s::StringDecoder)= s.cd!=C_NULL&&isreadable(s.stream)

iswritable(s::StringDecoder)=false

s="a string チャネルパートナーの選択"^10

b=IOBuffer(encode(s,"UTF-16LE"))

p=StringDecoder(b,"UTF-16LE")

@testread(p, String)== s

b=IOBuffer(encode(s,"UTF-16LE"))

p=StringDecoder(b,"UTF-16LE")

@testbytesavailable(p)==0

@testread(p, UInt8)===0x61

@testbytesavailable(p)==197

@testString(readavailable(p))== s[2:196]

@testbytesavailable(p)==0

@testString(readavailable(p))== s[199:394]

@testbytesavailable(p)==0

@testString(readavailable(p))== s[397:end]

@testisempty(readavailable(p))

@testbytesavailable(p)==0

@testeof(p)

close(p)

@testbytesavailable(p)==0

@test_throws ArgumentErrorreadavailable(p)

b=IOBuffer()