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Initial version (extracted from nim-serialization)

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Zahary Karadjov 2018-12-17 23:48:33 +02:00
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import
faststreams/[input_stream, output_stream]
export
input_stream, output_stream

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mode = ScriptMode.Verbose
packageName = "faststreams"
version = "0.1.0"
author = "Status Research & Development GmbH"
description = "Nearly zero-overhead input/output streams for Nim"
license = "Apache License 2.0"
skipDirs = @["tests"]
requires "nim >= 0.17.0",
"ranges"

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import
memfiles, options, ranges/ptr_arith
const
pageSize = 4096
type
StreamReader = proc (bufferStart: ptr byte, bufferSize: int): int
# TODO: use openarray once it's supported
AsyncStreamReader = StreamReader # proc (bufferStart: ptr byte, bufferSize: int): Future[int]
CloseStreamProc = proc ()
ByteStream* = object of RootObj
head: ptr byte
bufferSize: int
bufferStart, bufferEnd: ptr byte
reader: StreamReader
asyncReader: AsyncStreamReader
closeStream: CloseStreamProc
bufferEndPos: int
BufferedStream*[size: static int] = object of ByteStream
buffer: array[size, byte]
AsciiStream* = distinct ByteStream
UnicodeStream* = distinct ByteStream
ObjectStream*[T] = distinct ByteStream
proc openFile*(filename: string): ByteStream =
var memFile = memfiles.open(filename)
result.head = cast[ptr byte](memFile.mem)
result.bufferEnd = result.head.shift memFile.size
result.bufferEndPos = memFile.size
result.closeStream = proc = close memFile
proc init*(T: type ByteStream,
mem: openarray[byte],
reader = StreamReader(nil),
asyncReader = AsyncStreamReader(nil)): ByteStream =
# TODO: the result should use `from mem` once it's supported
result.head = unsafeAddr mem[0]
result.bufferEnd = result.head.shift mem.len
result.reader = reader
result.asyncReader = asyncReader
template memoryStream*(mem: openarray[byte]): ByteStream =
ByteStream.init(mem)
template memoryStream*(str: string): ByteStream =
bind init
init(ByteStream, str.toOpenArrayByte(0, str.len - 1))
proc init*(T: type BufferedStream,
reader = StreamReader(nil),
asyncReader = AsyncStreamReader(nil)): BufferedStream =
result.init result.buffer, reader, asyncReader
proc syncRead(s: var ByteStream): bool =
let bytesRead = s.reader(s.bufferStart, s.bufferSize)
if bytesRead == 0:
s.reader = nil
return true
else:
s.bufferEnd = s.bufferStart.shift bytesRead
s.bufferEndPos += bytesRead
return false
proc eof*(s: var ByteStream): bool =
if s.head != s.bufferEnd:
return false
if s.reader == nil:
return true
return s.syncRead()
proc eob*(s: ByteStream): bool {.inline.} =
s.head != s.bufferEnd
proc peek*(s: ByteStream): byte {.inline.} =
assert s.head != s.bufferEnd
return s.head[]
proc advance*(s: var ByteStream) =
if s.head != s.bufferEnd:
s.head = s.head.shift 1
elif s.reader != nil:
discard s.syncRead()
proc read*(s: var ByteStream): byte =
result = s.peek()
advance s
proc next*(s: var ByteStream): Option[byte] =
if not s.eof:
result = some s.read()
proc bufferPos(s: ByteStream, pos: int): ptr byte =
let shiftFromEnd = pos - s.bufferEndPos
assert shiftFromEnd < 0
result = s.bufferEnd.shift shiftFromEnd
assert result >= s.bufferStart
proc pos*(s: ByteStream): int {.inline.} =
s.bufferEndPos - distance(s.head, s.bufferEnd)
proc firstAccessiblePos*(s: ByteStream): int {.inline.} =
s.bufferEndPos - distance(s.bufferStart, s.bufferEnd)
proc `[]`*(s: ByteStream, pos: int): byte {.inline.} =
s.bufferPos(pos)[]
proc rewind*(s: var ByteStream, delta: int) =
s.head = s.head.shift(-delta)
assert s.head >= s.bufferStart
proc rewindTo*(s: var ByteStream, pos: int) {.inline.} =
s.head = s.bufferPos(pos)
# TODO: use a destructor once we migrate to Nim 0.20
proc close*(s: var ByteStream) =
if s.closeStream != nil:
s.closeStream()
# TODO: Use `distrinct with` once it's supported
template pos*(s: AsciiStream|UnicodeStream|ObjectStream): int =
ByteStream(s).pos
template eof*(s: var (AsciiStream|UnicodeStream|ObjectStream)): bool =
ByteStream(s).eof
template eob*(s: var (AsciiStream|UnicodeStream|ObjectStream)): bool =
ByteStream(s).eob
template close*(s: AsciiStream|UnicodeStream|ObjectStream) =
close ByteStream(s)
template advance*(s: var AsciiStream) =
advance ByteStream(s)
template peek*(s: AsciiStream): char =
char ByteStream(s).peek()
template read*(s: var AsciiStream): char =
char ByteStream(s).read()
template next*(s: var AsciiStream): Option[char] =
cast[Option[char]](ByteStream(s).next())

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import
ranges/ptr_arith
type
OutputStreamVTable = tuple
prepareOutput: proc (s: ptr OutputStream, size: int) {.nimcall.}
finish: proc (s: ptr OutputStream) {.nimcall.}
OutputStream* = object {.inheritable.}
head, bufferEnd: ptr byte
vtable: ptr OutputStreamVTable
MemoryOutputStream*[T] = object of OutputStream
output: T
StringOutputStream* = MemoryOutputStream[string]
BytesOutputStream* = MemoryOutputStream[seq[byte]]
FileOutputStream* = object of OutputStream
file: File
const
pageSize = 4096
proc prepareOutputImpl[T](s: ptr OutputStream, size: int) =
let s = cast[ptr T](s)
let currentSize = s.output.len
s.output.setLen(s.output.len + pageSize)
s.head = cast[ptr byte](addr s.output[currentSize])
s.bufferEnd = cast[ptr byte](shift(addr s.output[0], s.output.len))
proc finishImpl[T](s: ptr OutputStream) =
let s = cast[ptr T](s)
s.output.setLen(s.output.len - distance(s.head, s.bufferEnd))
proc init*(T: type MemoryOutputStream): T =
var vtable {.global.} = (prepareOutputImpl[T], finishImpl[T])
result.vtable = addr vtable
result.vtable.prepareOutput(addr result, pageSize)
proc append*(s: var OutputStream, b: byte) =
if s.head == s.bufferEnd:
s.vtable.prepareOutput(addr s, pageSize)
s.head[] = b
s.head = shift(s.head, 1)
template append*(s: var OutputStream, c: char) =
s.append byte(c)
proc flush*(s: var OutputStream) =
s.vtable.finish(addr s)
proc getOutput*(s: var MemoryOutputStream): auto =
flush s
shallow s.output
return s.output
proc append*(s: var OutputStream, bytes: openarray[byte]) =
# TODO: this can use copyMem
for b in bytes:
s.append b
proc append*(s: var OutputStream, chars: openarray[char]) =
# TODO: this can use copyMem
for c in chars:
s.append byte(c)
template append*(s: var OutputStream, str: string) =
s.append str.toOpenArrayByte(0, str.len - 1)
# Any stream
proc appendNumberImpl(s: var OutputStream, number: BiggestInt) =
# TODO: don't allocate
s.append $number
proc appendNumberImpl(s: var OutputStream, number: BiggestUInt) =
# TODO: don't allocate
s.append $number
template toBiggestRepr(i: SomeUnsignedInt): BiggestUInt =
BiggestUInt(i)
template toBiggestRepr(i: SomeSignedInt): BiggestInt =
BiggestInt(i)
template appendNumber*(s: var OutputStream, i: SomeInteger) =
# TODO: specify radix/base
appendNumberImpl(s, toBiggestRepr(i))

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import
unittest,
../faststreams
suite "output stream":
test "string output":
var s = init StringOutputStream
var altOutput = ""
for i in 0 .. 1000:
s.appendNumber i
s.append " bottles on the wall"
s.append byte('\n')
altOutput.add $i
altOutput.add " bottles on the wall"
altOutput.add '\n'
let streamOutput = s.getOutput
check streamOutput == altOutput