(module lzma (compress decompress)

(import scheme)
(import chicken)
(import foreign)
(use lolevel)

(foreign-declare "#include <lzmalib.h>")

(foreign-declare "static int lzma_return_buffer_len;")

(define-foreign-variable lzma-return-buffer-len int "lzma_return_buffer_len")
(define _decompress (foreign-lambda* c-pointer ((blob inblob) (int inlen))
   "C_return (lzma_decompress(inblob, inlen, &lzma_return_buffer_len));"))
(define _compress (foreign-lambda* c-pointer ((blob inblob) (int inlen))
   "C_return (lzma_compress(inblob, inlen, &lzma_return_buffer_len));"))
(define _free (foreign-lambda void "lzma_free" c-pointer))

(define (decompress inblob)
   (let ((ptr (_decompress inblob (blob-size inblob))))
      (if (null-pointer? ptr)
         #f
         (let ((outblob (make-blob lzma-return-buffer-len)))
            (begin
               (move-memory! ptr outblob lzma-return-buffer-len)
               (_free ptr)
               outblob)))))

(define (compress inblob)
   (let ((ptr (_compress inblob (blob-size inblob))))
      (if (null-pointer? ptr)
         #f
         (let ((outblob (make-blob lzma-return-buffer-len)))
            (begin
               (move-memory! ptr outblob lzma-return-buffer-len)
               (_free ptr)
               outblob))))))