mirror of
https://github.com/idris-lang/Idris2.git
synced 2024-12-22 19:21:39 +03:00
287 lines
9.9 KiB
Idris
287 lines
9.9 KiB
Idris
module Data.Buffer
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import Data.List
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%default total
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-- Reading and writing binary buffers. Note that this primitives are unsafe,
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-- in that they don't check that buffer locations are within bounds.
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-- We really need a safe wrapper!
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-- They are used in the Idris compiler itself for reading/writing checked
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-- files.
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-- This is known to the compiler, so maybe ought to be moved to Builtin
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export
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data Buffer : Type where [external]
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%foreign "scheme:blodwen-buffer-size"
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"RefC:getBufferSize"
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"node:lambda:b => b.length"
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prim__bufferSize : Buffer -> Int
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export %inline
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rawSize : HasIO io => Buffer -> io Int
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rawSize buf = pure (prim__bufferSize buf)
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%foreign "scheme:blodwen-new-buffer"
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"RefC:newBuffer"
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"node:lambda:s=>Buffer.alloc(s)"
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prim__newBuffer : Int -> PrimIO Buffer
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export
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newBuffer : HasIO io => Int -> io (Maybe Buffer)
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newBuffer size
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= if size >= 0
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then do buf <- primIO (prim__newBuffer size)
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pure $ Just buf
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else pure Nothing
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-- if prim__nullAnyPtr buf /= 0
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-- then pure Nothing
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-- else pure $ Just $ MkBuffer buf size 0
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%foreign "scheme:blodwen-buffer-setbyte"
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"RefC:setBufferByte"
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"node:lambda:(buf,offset,value)=>buf.writeUInt8(value, offset)"
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prim__setByte : Buffer -> (offset : Int) -> (val : Int) -> PrimIO ()
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%foreign "scheme:blodwen-buffer-setbyte"
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"RefC:setBufferByte"
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"node:lambda:(buf,offset,value)=>buf.writeUInt8(value, offset)"
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prim__setBits8 : Buffer -> (offset : Int) -> (val: Bits8) -> PrimIO ()
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-- Assumes val is in the range 0-255
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export %inline
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setByte : HasIO io => Buffer -> (offset : Int) -> (val : Int) -> io ()
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setByte buf offset val
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= primIO (prim__setByte buf offset val)
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export %inline
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setBits8 : HasIO io => Buffer -> (offset : Int) -> (val : Bits8) -> io ()
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setBits8 buf offset val
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= primIO (prim__setBits8 buf offset val)
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%foreign "scheme:blodwen-buffer-getbyte"
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"RefC:getBufferByte"
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"node:lambda:(buf,offset)=>buf.readUInt8(offset)"
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prim__getByte : Buffer -> (offset : Int) -> PrimIO Int
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%foreign "scheme:blodwen-buffer-getbyte"
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"RefC:getBufferByte"
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"node:lambda:(buf,offset)=>buf.readUInt8(offset)"
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prim__getBits8 : Buffer -> (offset : Int) -> PrimIO Bits8
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export %inline
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getByte : HasIO io => Buffer -> (offset : Int) -> io Int
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getByte buf offset
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= primIO (prim__getByte buf offset)
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export %inline
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getBits8 : HasIO io => Buffer -> (offset : Int) -> io Bits8
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getBits8 buf offset
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= primIO (prim__getBits8 buf offset)
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%foreign "scheme:blodwen-buffer-setbits16"
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"node:lambda:(buf,offset,value)=>buf.writeUInt16LE(value, offset)"
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prim__setBits16 : Buffer -> (offset : Int) -> (value : Bits16) -> PrimIO ()
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export %inline
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setBits16 : HasIO io => Buffer -> (offset : Int) -> (val : Bits16) -> io ()
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setBits16 buf offset val
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= primIO (prim__setBits16 buf offset val)
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%foreign "scheme:blodwen-buffer-getbits16"
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"node:lambda:(buf,offset)=>buf.readUInt16LE(offset)"
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prim__getBits16 : Buffer -> (offset : Int) -> PrimIO Bits16
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export %inline
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getBits16 : HasIO io => Buffer -> (offset : Int) -> io Bits16
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getBits16 buf offset
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= primIO (prim__getBits16 buf offset)
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%foreign "scheme:blodwen-buffer-setbits32"
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"node:lambda:(buf,offset,value)=>buf.writeUInt32LE(value, offset)"
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prim__setBits32 : Buffer -> (offset : Int) -> (value : Bits32) -> PrimIO ()
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export %inline
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setBits32 : HasIO io => Buffer -> (offset : Int) -> (val : Bits32) -> io ()
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setBits32 buf offset val
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= primIO (prim__setBits32 buf offset val)
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%foreign "scheme:blodwen-buffer-getbits32"
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"node:lambda:(buf,offset)=>buf.readUInt32LE(offset)"
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prim__getBits32 : Buffer -> Int -> PrimIO Bits32
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export %inline
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getBits32 : HasIO io => Buffer -> (offset : Int) -> io Bits32
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getBits32 buf offset
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= primIO (prim__getBits32 buf offset)
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%foreign "scheme:blodwen-buffer-setbits64"
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prim__setBits64 : Buffer -> Int -> Bits64 -> PrimIO ()
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export %inline
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setBits64 : HasIO io => Buffer -> (offset : Int) -> (val : Bits64) -> io ()
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setBits64 buf offset val
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= primIO (prim__setBits64 buf offset val)
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%foreign "scheme:blodwen-buffer-getbits64"
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prim__getBits64 : Buffer -> (offset : Int) -> PrimIO Bits64
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export %inline
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getBits64 : HasIO io => Buffer -> (offset : Int) -> io Bits64
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getBits64 buf offset
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= primIO (prim__getBits64 buf offset)
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%foreign "scheme:blodwen-buffer-setint32"
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"node:lambda:(buf,offset,value)=>buf.writeInt32LE(value, offset)"
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prim__setInt32 : Buffer -> (offset : Int) -> (val : Int) -> PrimIO ()
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export %inline
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setInt32 : HasIO io => Buffer -> (offset : Int) -> (val : Int) -> io ()
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setInt32 buf offset val
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= primIO (prim__setInt32 buf offset val)
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%foreign "scheme:blodwen-buffer-getint32"
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"node:lambda:(buf,offset)=>buf.readInt32LE(offset)"
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prim__getInt32 : Buffer -> (offset : Int) -> PrimIO Int
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export %inline
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getInt32 : HasIO io => Buffer -> (offset : Int) -> io Int
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getInt32 buf offset
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= primIO (prim__getInt32 buf offset)
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%foreign "scheme:blodwen-buffer-setint"
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"RefC:setBufferInt"
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"node:lambda:(buf,offset,value)=>buf.writeInt32LE(value, offset)"
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prim__setInt : Buffer -> (offset : Int) -> (val : Int) -> PrimIO ()
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export %inline
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setInt : HasIO io => Buffer -> (offset : Int) -> (val : Int) -> io ()
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setInt buf offset val
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= primIO (prim__setInt buf offset val)
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%foreign "scheme:blodwen-buffer-getint"
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"RefC:getBufferInt"
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"node:lambda:(buf,offset)=>buf.readInt32LE(offset)"
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prim__getInt : Buffer -> (offset : Int) -> PrimIO Int
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export %inline
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getInt : HasIO io => Buffer -> (offset : Int) -> io Int
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getInt buf offset
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= primIO (prim__getInt buf offset)
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%foreign "scheme:blodwen-buffer-setdouble"
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"RefC:setBufferDouble"
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"node:lambda:(buf,offset,value)=>buf.writeDoubleLE(value, offset)"
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prim__setDouble : Buffer -> (offset : Int) -> (val : Double) -> PrimIO ()
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export %inline
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setDouble : HasIO io => Buffer -> (offset : Int) -> (val : Double) -> io ()
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setDouble buf offset val
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= primIO (prim__setDouble buf offset val)
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%foreign "scheme:blodwen-buffer-getdouble"
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"RefC:getBufferDouble"
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"node:lambda:(buf,offset)=>buf.readDoubleLE(offset)"
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prim__getDouble : Buffer -> (offset : Int) -> PrimIO Double
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export %inline
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getDouble : HasIO io => Buffer -> (offset : Int) -> io Double
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getDouble buf offset
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= primIO (prim__getDouble buf offset)
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-- Get the length of a string in bytes, rather than characters
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export
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%foreign "scheme:blodwen-stringbytelen"
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"C:strlen, libc 6"
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stringByteLength : String -> Int
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%foreign "scheme:blodwen-buffer-setstring"
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"RefC:setBufferString"
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"node:lambda:(buf,offset,value)=>buf.write(value, offset,buf.length - offset, 'utf-8')"
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prim__setString : Buffer -> (offset : Int) -> (val : String) -> PrimIO ()
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export %inline
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setString : HasIO io => Buffer -> (offset : Int) -> (val : String) -> io ()
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setString buf offset val
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= primIO (prim__setString buf offset val)
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%foreign "scheme:blodwen-buffer-getstring"
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"RefC:getBufferString"
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"node:lambda:(buf,offset,len)=>buf.slice(offset, offset+len).toString('utf-8')"
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prim__getString : Buffer -> (offset : Int) -> (len : Int) -> PrimIO String
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export %inline
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getString : HasIO io => Buffer -> (offset : Int) -> (len : Int) -> io String
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getString buf offset len
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= primIO (prim__getString buf offset len)
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export
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covering
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bufferData : HasIO io => Buffer -> io (List Int)
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bufferData buf
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= do len <- rawSize buf
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unpackTo [] len
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where
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covering
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unpackTo : List Int -> Int -> io (List Int)
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unpackTo acc 0 = pure acc
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unpackTo acc offset
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= do val <- getByte buf (offset - 1)
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unpackTo (val :: acc) (offset - 1)
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%foreign "scheme:blodwen-buffer-copydata"
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"RefC:copyBuffer"
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"node:lambda:(b1,o1,length,b2,o2)=>b1.copy(b2,o2,o1,o1+length)"
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prim__copyData : (src : Buffer) -> (srcOffset, len : Int) ->
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(dst : Buffer) -> (dstOffset : Int) -> PrimIO ()
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export
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copyData : HasIO io => Buffer -> (srcOffset, len : Int) ->
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(dst : Buffer) -> (dstOffset : Int) -> io ()
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copyData src start len dest offset
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= primIO (prim__copyData src start len dest offset)
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export
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resizeBuffer : HasIO io => Buffer -> Int -> io (Maybe Buffer)
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resizeBuffer old newsize
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= do Just buf <- newBuffer newsize
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| Nothing => pure Nothing
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-- If the new buffer is smaller than the old one, just copy what
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-- fits
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oldsize <- rawSize old
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let len = if newsize < oldsize then newsize else oldsize
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copyData old 0 len buf 0
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pure (Just buf)
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||| Create a buffer containing the concatenated content from a
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||| list of buffers.
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export
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concatBuffers : HasIO io => List Buffer -> io (Maybe Buffer)
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concatBuffers xs
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= do let sizes = map prim__bufferSize xs
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let (totalSize, revCumulative) = foldl scanSize (0,[]) sizes
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let cumulative = reverse revCumulative
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Just buf <- newBuffer totalSize
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| Nothing => pure Nothing
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traverse_ (\(b, size, watermark) => copyData b 0 size buf watermark) (zip3 xs sizes cumulative)
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pure (Just buf)
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where
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scanSize : (Int, List Int) -> Int -> (Int, List Int)
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scanSize (s, cs) x = (s+x, s::cs)
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||| Split a buffer into two at a position.
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export
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splitBuffer : HasIO io => Buffer -> Int -> io (Maybe (Buffer, Buffer))
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splitBuffer buf pos = do size <- rawSize buf
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if pos > 0 && pos < size
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then do Just first <- newBuffer pos
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| Nothing => pure Nothing
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Just second <- newBuffer (size - pos)
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| Nothing => pure Nothing
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copyData buf 0 pos first 0
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copyData buf pos (size-pos) second 0
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pure $ Just (first, second)
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else pure Nothing
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