mirror of
https://github.com/idris-lang/Idris2.git
synced 2024-12-21 02:31:50 +03:00
346 lines
12 KiB
Idris
346 lines
12 KiB
Idris
module Data.Buffer
|
|
|
|
import System.Directory
|
|
import System.File
|
|
|
|
import Data.List
|
|
|
|
%default total
|
|
|
|
-- Reading and writing binary buffers. Note that this primitives are unsafe,
|
|
-- in that they don't check that buffer locations are within bounds.
|
|
-- We really need a safe wrapper!
|
|
-- They are used in the Idris compiler itself for reading/writing checked
|
|
-- files.
|
|
|
|
-- This is known to the compiler, so maybe ought to be moved to Builtin
|
|
export
|
|
data Buffer : Type where [external]
|
|
|
|
%foreign "scheme:blodwen-buffer-size"
|
|
"RefC:getBufferSize"
|
|
"node:lambda:b => b.length"
|
|
prim__bufferSize : Buffer -> Int
|
|
|
|
export %inline
|
|
rawSize : HasIO io => Buffer -> io Int
|
|
rawSize buf = pure (prim__bufferSize buf)
|
|
|
|
%foreign "scheme:blodwen-new-buffer"
|
|
"RefC:newBuffer"
|
|
"node:lambda:s=>Buffer.alloc(s)"
|
|
prim__newBuffer : Int -> PrimIO Buffer
|
|
|
|
export
|
|
newBuffer : HasIO io => Int -> io (Maybe Buffer)
|
|
newBuffer size
|
|
= if size >= 0
|
|
then do buf <- primIO (prim__newBuffer size)
|
|
pure $ Just buf
|
|
else pure Nothing
|
|
-- if prim__nullAnyPtr buf /= 0
|
|
-- then pure Nothing
|
|
-- else pure $ Just $ MkBuffer buf size 0
|
|
|
|
%foreign "scheme:blodwen-buffer-setbyte"
|
|
"RefC:setBufferByte"
|
|
"node:lambda:(buf,offset,value)=>buf.writeUInt8(value, offset)"
|
|
prim__setByte : Buffer -> (offset : Int) -> (val : Int) -> PrimIO ()
|
|
|
|
%foreign "scheme:blodwen-buffer-setbyte"
|
|
"RefC:setBufferByte"
|
|
"node:lambda:(buf,offset,value)=>buf.writeUInt8(value, offset)"
|
|
prim__setBits8 : Buffer -> (offset : Int) -> (val: Bits8) -> PrimIO ()
|
|
|
|
-- Assumes val is in the range 0-255
|
|
export %inline
|
|
setByte : HasIO io => Buffer -> (offset : Int) -> (val : Int) -> io ()
|
|
setByte buf offset val
|
|
= primIO (prim__setByte buf offset val)
|
|
|
|
export %inline
|
|
setBits8 : HasIO io => Buffer -> (offset : Int) -> (val : Bits8) -> io ()
|
|
setBits8 buf offset val
|
|
= primIO (prim__setBits8 buf offset val)
|
|
|
|
%foreign "scheme:blodwen-buffer-getbyte"
|
|
"RefC:getBufferByte"
|
|
"node:lambda:(buf,offset)=>buf.readUInt8(offset)"
|
|
prim__getByte : Buffer -> (offset : Int) -> PrimIO Int
|
|
|
|
%foreign "scheme:blodwen-buffer-getbyte"
|
|
"RefC:getBufferByte"
|
|
"node:lambda:(buf,offset)=>buf.readUInt8(offset)"
|
|
prim__getBits8 : Buffer -> (offset : Int) -> PrimIO Bits8
|
|
|
|
export %inline
|
|
getByte : HasIO io => Buffer -> (offset : Int) -> io Int
|
|
getByte buf offset
|
|
= primIO (prim__getByte buf offset)
|
|
|
|
export %inline
|
|
getBits8 : HasIO io => Buffer -> (offset : Int) -> io Bits8
|
|
getBits8 buf offset
|
|
= primIO (prim__getBits8 buf offset)
|
|
|
|
%foreign "scheme:blodwen-buffer-setbits16"
|
|
"node:lambda:(buf,offset,value)=>buf.writeUInt16LE(value, offset)"
|
|
prim__setBits16 : Buffer -> (offset : Int) -> (value : Bits16) -> PrimIO ()
|
|
|
|
export %inline
|
|
setBits16 : HasIO io => Buffer -> (offset : Int) -> (val : Bits16) -> io ()
|
|
setBits16 buf offset val
|
|
= primIO (prim__setBits16 buf offset val)
|
|
|
|
%foreign "scheme:blodwen-buffer-getbits16"
|
|
"node:lambda:(buf,offset)=>buf.readUInt16LE(offset)"
|
|
prim__getBits16 : Buffer -> (offset : Int) -> PrimIO Bits16
|
|
|
|
export %inline
|
|
getBits16 : HasIO io => Buffer -> (offset : Int) -> io Bits16
|
|
getBits16 buf offset
|
|
= primIO (prim__getBits16 buf offset)
|
|
|
|
%foreign "scheme:blodwen-buffer-setbits32"
|
|
"node:lambda:(buf,offset,value)=>buf.writeUInt32LE(value, offset)"
|
|
prim__setBits32 : Buffer -> (offset : Int) -> (value : Bits32) -> PrimIO ()
|
|
|
|
export %inline
|
|
setBits32 : HasIO io => Buffer -> (offset : Int) -> (val : Bits32) -> io ()
|
|
setBits32 buf offset val
|
|
= primIO (prim__setBits32 buf offset val)
|
|
|
|
%foreign "scheme:blodwen-buffer-getbits32"
|
|
"node:lambda:(buf,offset)=>buf.readUInt32LE(offset)"
|
|
prim__getBits32 : Buffer -> Int -> PrimIO Bits32
|
|
|
|
export %inline
|
|
getBits32 : HasIO io => Buffer -> (offset : Int) -> io Bits32
|
|
getBits32 buf offset
|
|
= primIO (prim__getBits32 buf offset)
|
|
|
|
%foreign "scheme:blodwen-buffer-setbits64"
|
|
prim__setBits64 : Buffer -> Int -> Bits64 -> PrimIO ()
|
|
|
|
export %inline
|
|
setBits64 : HasIO io => Buffer -> (offset : Int) -> (val : Bits64) -> io ()
|
|
setBits64 buf offset val
|
|
= primIO (prim__setBits64 buf offset val)
|
|
|
|
%foreign "scheme:blodwen-buffer-getbits64"
|
|
prim__getBits64 : Buffer -> (offset : Int) -> PrimIO Bits64
|
|
|
|
export %inline
|
|
getBits64 : HasIO io => Buffer -> (offset : Int) -> io Bits64
|
|
getBits64 buf offset
|
|
= primIO (prim__getBits64 buf offset)
|
|
|
|
%foreign "scheme:blodwen-buffer-setint32"
|
|
"node:lambda:(buf,offset,value)=>buf.writeInt32LE(value, offset)"
|
|
prim__setInt32 : Buffer -> (offset : Int) -> (val : Int) -> PrimIO ()
|
|
|
|
export %inline
|
|
setInt32 : HasIO io => Buffer -> (offset : Int) -> (val : Int) -> io ()
|
|
setInt32 buf offset val
|
|
= primIO (prim__setInt32 buf offset val)
|
|
|
|
%foreign "scheme:blodwen-buffer-getint32"
|
|
"node:lambda:(buf,offset)=>buf.readInt32LE(offset)"
|
|
prim__getInt32 : Buffer -> (offset : Int) -> PrimIO Int
|
|
|
|
export %inline
|
|
getInt32 : HasIO io => Buffer -> (offset : Int) -> io Int
|
|
getInt32 buf offset
|
|
= primIO (prim__getInt32 buf offset)
|
|
|
|
%foreign "scheme:blodwen-buffer-setint"
|
|
"RefC:setBufferInt"
|
|
"node:lambda:(buf,offset,value)=>buf.writeInt32LE(value, offset)"
|
|
prim__setInt : Buffer -> (offset : Int) -> (val : Int) -> PrimIO ()
|
|
|
|
export %inline
|
|
setInt : HasIO io => Buffer -> (offset : Int) -> (val : Int) -> io ()
|
|
setInt buf offset val
|
|
= primIO (prim__setInt buf offset val)
|
|
|
|
%foreign "scheme:blodwen-buffer-getint"
|
|
"RefC:getBufferInt"
|
|
"node:lambda:(buf,offset)=>buf.readInt32LE(offset)"
|
|
prim__getInt : Buffer -> (offset : Int) -> PrimIO Int
|
|
|
|
export %inline
|
|
getInt : HasIO io => Buffer -> (offset : Int) -> io Int
|
|
getInt buf offset
|
|
= primIO (prim__getInt buf offset)
|
|
|
|
%foreign "scheme:blodwen-buffer-setdouble"
|
|
"RefC:setBufferDouble"
|
|
"node:lambda:(buf,offset,value)=>buf.writeDoubleLE(value, offset)"
|
|
prim__setDouble : Buffer -> (offset : Int) -> (val : Double) -> PrimIO ()
|
|
|
|
export %inline
|
|
setDouble : HasIO io => Buffer -> (offset : Int) -> (val : Double) -> io ()
|
|
setDouble buf offset val
|
|
= primIO (prim__setDouble buf offset val)
|
|
|
|
%foreign "scheme:blodwen-buffer-getdouble"
|
|
"RefC:getBufferDouble"
|
|
"node:lambda:(buf,offset)=>buf.readDoubleLE(offset)"
|
|
prim__getDouble : Buffer -> (offset : Int) -> PrimIO Double
|
|
|
|
export %inline
|
|
getDouble : HasIO io => Buffer -> (offset : Int) -> io Double
|
|
getDouble buf offset
|
|
= primIO (prim__getDouble buf offset)
|
|
|
|
-- Get the length of a string in bytes, rather than characters
|
|
export
|
|
%foreign "scheme:blodwen-stringbytelen"
|
|
"C:strlen, libc 6"
|
|
stringByteLength : String -> Int
|
|
|
|
%foreign "scheme:blodwen-buffer-setstring"
|
|
"RefC:setBufferString"
|
|
"node:lambda:(buf,offset,value)=>buf.write(value, offset,buf.length - offset, 'utf-8')"
|
|
prim__setString : Buffer -> (offset : Int) -> (val : String) -> PrimIO ()
|
|
|
|
export %inline
|
|
setString : HasIO io => Buffer -> (offset : Int) -> (val : String) -> io ()
|
|
setString buf offset val
|
|
= primIO (prim__setString buf offset val)
|
|
|
|
%foreign "scheme:blodwen-buffer-getstring"
|
|
"RefC:getBufferString"
|
|
"node:lambda:(buf,offset,len)=>buf.slice(offset, offset+len).toString('utf-8')"
|
|
prim__getString : Buffer -> (offset : Int) -> (len : Int) -> PrimIO String
|
|
|
|
export %inline
|
|
getString : HasIO io => Buffer -> (offset : Int) -> (len : Int) -> io String
|
|
getString buf offset len
|
|
= primIO (prim__getString buf offset len)
|
|
|
|
export
|
|
covering
|
|
bufferData : HasIO io => Buffer -> io (List Int)
|
|
bufferData buf
|
|
= do len <- rawSize buf
|
|
unpackTo [] len
|
|
where
|
|
covering
|
|
unpackTo : List Int -> Int -> io (List Int)
|
|
unpackTo acc 0 = pure acc
|
|
unpackTo acc offset
|
|
= do val <- getByte buf (offset - 1)
|
|
unpackTo (val :: acc) (offset - 1)
|
|
|
|
|
|
%foreign "scheme:blodwen-buffer-copydata"
|
|
"RefC:copyBuffer"
|
|
"node:lambda:(b1,o1,length,b2,o2)=>b1.copy(b2,o2,o1,o1+length)"
|
|
prim__copyData : (src : Buffer) -> (srcOffset, len : Int) ->
|
|
(dst : Buffer) -> (dstOffset : Int) -> PrimIO ()
|
|
|
|
export
|
|
copyData : HasIO io => Buffer -> (srcOffset, len : Int) ->
|
|
(dst : Buffer) -> (dstOffset : Int) -> io ()
|
|
copyData src start len dest offset
|
|
= primIO (prim__copyData src start len dest offset)
|
|
|
|
%foreign "C:idris2_readBufferData, libidris2_support, idris_file.h"
|
|
"node:lambda:(f,b,l,m) => require('fs').readSync(f.fd,b,l,m)"
|
|
prim__readBufferData : FilePtr -> Buffer -> (offset : Int) -> (maxbytes : Int) -> PrimIO Int
|
|
|
|
%foreign "C:idris2_writeBufferData, libidris2_support, idris_file.h"
|
|
"node:lambda:(f,b,l,m) => require('fs').writeSync(f.fd,b,l,m)"
|
|
prim__writeBufferData : FilePtr -> Buffer -> (offset : Int) -> (maxbytes : Int) -> PrimIO Int
|
|
|
|
export
|
|
readBufferData : HasIO io => File -> Buffer ->
|
|
(offset : Int) -> -- position in buffer to start adding
|
|
(maxbytes : Int) -> -- maximums size to read, which must not
|
|
-- exceed buffer length
|
|
io (Either FileError ())
|
|
readBufferData (FHandle h) buf offset max
|
|
= do read <- primIO (prim__readBufferData h buf offset max)
|
|
if read >= 0
|
|
then pure (Right ())
|
|
else pure (Left FileReadError)
|
|
|
|
export
|
|
writeBufferData : HasIO io => File -> Buffer ->
|
|
(offset : Int) -> -- position in buffer to write from
|
|
(maxbytes : Int) -> -- maximums size to write, which must not
|
|
-- exceed buffer length
|
|
io (Either FileError ())
|
|
writeBufferData (FHandle h) buf offset max
|
|
= do written <- primIO (prim__writeBufferData h buf offset max)
|
|
if written >= 0
|
|
then pure (Right ())
|
|
else pure (Left FileWriteError)
|
|
|
|
export
|
|
writeBufferToFile : HasIO io => String -> Buffer -> Int -> io (Either FileError ())
|
|
writeBufferToFile fn buf max
|
|
= do Right f <- openFile fn WriteTruncate
|
|
| Left err => pure (Left err)
|
|
Right ok <- writeBufferData f buf 0 max
|
|
| Left err => pure (Left err)
|
|
closeFile f
|
|
pure (Right ok)
|
|
|
|
export
|
|
createBufferFromFile : HasIO io => String -> io (Either FileError Buffer)
|
|
createBufferFromFile fn
|
|
= do Right f <- openFile fn Read
|
|
| Left err => pure (Left err)
|
|
Right size <- fileSize f
|
|
| Left err => pure (Left err)
|
|
Just buf <- newBuffer size
|
|
| Nothing => pure (Left FileReadError)
|
|
Right ok <- readBufferData f buf 0 size
|
|
| Left err => pure (Left err)
|
|
closeFile f
|
|
pure (Right buf)
|
|
|
|
export
|
|
resizeBuffer : HasIO io => Buffer -> Int -> io (Maybe Buffer)
|
|
resizeBuffer old newsize
|
|
= do Just buf <- newBuffer newsize
|
|
| Nothing => pure Nothing
|
|
-- If the new buffer is smaller than the old one, just copy what
|
|
-- fits
|
|
oldsize <- rawSize old
|
|
let len = if newsize < oldsize then newsize else oldsize
|
|
copyData old 0 len buf 0
|
|
pure (Just buf)
|
|
|
|
||| Create a buffer containing the concatenated content from a
|
|
||| list of buffers.
|
|
export
|
|
concatBuffers : HasIO io => List Buffer -> io (Maybe Buffer)
|
|
concatBuffers xs
|
|
= do let sizes = map prim__bufferSize xs
|
|
let (totalSize, revCumulative) = foldl scanSize (0,[]) sizes
|
|
let cumulative = reverse revCumulative
|
|
Just buf <- newBuffer totalSize
|
|
| Nothing => pure Nothing
|
|
traverse_ (\(b, size, watermark) => copyData b 0 size buf watermark) (zip3 xs sizes cumulative)
|
|
pure (Just buf)
|
|
where
|
|
scanSize : (Int, List Int) -> Int -> (Int, List Int)
|
|
scanSize (s, cs) x = (s+x, s::cs)
|
|
|
|
||| Split a buffer into two at a position.
|
|
export
|
|
splitBuffer : HasIO io => Buffer -> Int -> io (Maybe (Buffer, Buffer))
|
|
splitBuffer buf pos = do size <- rawSize buf
|
|
if pos > 0 && pos < size
|
|
then do Just first <- newBuffer pos
|
|
| Nothing => pure Nothing
|
|
Just second <- newBuffer (size - pos)
|
|
| Nothing => pure Nothing
|
|
copyData buf 0 pos first 0
|
|
copyData buf pos (size-pos) second 0
|
|
pure $ Just (first, second)
|
|
else pure Nothing
|