110 lines
3.3 KiB
Racket
110 lines
3.3 KiB
Racket
#lang r7rs
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(define-library
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(retropikzel pffi v0-2-2 racket)
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(import (scheme base)
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(scheme write)
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(scheme file)
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(scheme process-context)
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(compatibility mlist)
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(ffi unsafe)
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(ffi vector))
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(export pffi-shared-object-load
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pffi-define
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pffi-size-of
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pffi-pointer-allocate
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pffi-pointer-null
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pffi-string->pointer
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pffi-pointer->string
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pffi-pointer-free
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pffi-pointer?
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pffi-pointer-null?
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pffi-pointer-set!
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pffi-pointer-get
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pffi-pointer-deref)
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(begin
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(define pffi-type->native-type
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(lambda (type)
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(cond ((equal? type 'int8) _int8)
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((equal? type 'uint8) _uint8)
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((equal? type 'int16) _int16)
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((equal? type 'uint16) _uint16)
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((equal? type 'int32) _int32)
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((equal? type 'uint32) _uint32)
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((equal? type 'int64) _int64)
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((equal? type 'uint64) _uint64)
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((equal? type 'char) _int)
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((equal? type 'unsigned-char) _int)
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((equal? type 'short) _short)
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((equal? type 'unsigned-short) _ushort)
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((equal? type 'int) _int)
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((equal? type 'unsigned-int) _uint)
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((equal? type 'long) _long)
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((equal? type 'unsigned-long) _ulong)
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((equal? type 'float) _float)
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((equal? type 'double) _double)
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((equal? type 'pointer) _pointer)
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((equal? type 'string) _pointer)
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((equal? type 'void) _void)
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(else (error "pffi-type->native-type -- No such pffi type" type)))))
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(define pffi-pointer?
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(lambda (object)
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(cpointer? object)))
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(define-syntax pffi-define
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(syntax-rules ()
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((pffi-define scheme-name shared-object c-name return-type argument-types)
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(define scheme-name
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(get-ffi-obj c-name
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shared-object
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(_cprocedure (mlist->list (map pffi-type->native-type argument-types))
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(pffi-type->native-type return-type)))))))
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(define pffi-size-of
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(lambda (type)
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(ctype-sizeof (pffi-type->native-type type))))
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(define pffi-pointer-allocate
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(lambda (size)
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(malloc size 'raw)))
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(define pffi-pointer-null
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(lambda ()
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#f ; In racket #f is null pointer
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))
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(define pffi-string->pointer
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(lambda (string-content)
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(cast string-content _string _pointer)))
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(define pffi-pointer->string
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(lambda (pointer)
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(cast pointer _pointer _string)))
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(define pffi-shared-object-load
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(lambda (header path)
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(ffi-lib path)))
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(define pffi-pointer-free
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(lambda (pointer)
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(free pointer)))
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(define pffi-pointer-null?
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(lambda (pointer)
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(not pointer) ; #f is the null pointer on racket
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))
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(define pffi-pointer-set!
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(lambda (pointer type offset value)
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(ptr-set! pointer (pffi-type->native-type type) offset value)))
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(define pffi-pointer-get
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(lambda (pointer type offset)
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(ptr-ref pointer (pffi-type->native-type type) offset)))
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(define pffi-pointer-deref
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(lambda (pointer)
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pointer))))
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