io.buffers: adding a buffer-read-into that can take a c-ptr or a sequence.

basis/io/buffers/buffers-tests.factor

@@ -1,7 +1,6 @@
 IN: io.buffers.tests
-USING: alien alien.c-types alien.data io.buffers kernel
-kernel.private libc sequences tools.test namespaces byte-arrays
-strings accessors destructors ;
+USING: accessors alien alien.data arrays byte-arrays destructors
+io.buffers kernel libc namespaces sequences strings tools.test ;
 
 : buffer-set ( string buffer -- )
     [ ptr>> swap >byte-array binary-object memcpy ]
@@ -63,3 +62,15 @@ strings accessors destructors ;
 "hello world" string>buffer "b" set
 [ "hello" CHAR: \s ] [ " " "b" get buffer-read-until [ >string ] dip ] unit-test
 "b" get dispose
+
+[ 4 B{ 1 2 3 4 0 0 0 0 0 0 } ] [
+    10 <buffer>
+    [ B{ 1 2 3 4 } binary-object rot buffer-write ]
+    [ 10 <byte-array> [ 10 rot buffer-read-into ] keep ] bi
+] unit-test
+
+[ 4 { 1 2 3 4 f f f f f f } ] [
+    10 <buffer>
+    [ B{ 1 2 3 4 } binary-object rot buffer-write ]
+    [ 10 f <array> [ 10 rot buffer-read-into ] keep ] bi
+] unit-test

basis/io/buffers/buffers.factor

@@ -3,7 +3,7 @@
 ! See http://factorcode.org/license.txt for BSD license.
 USING: accessors alien alien.accessors alien.data byte-arrays
 combinators destructors kernel libc math math.order sequences
-typed ;
+sequences.private typed ;
 IN: io.buffers
 
 TUPLE: buffer
@@ -51,6 +51,18 @@ TYPED: buffer-read-unsafe ( n: fixnum buffer: buffer -- n ptr )
 TYPED: buffer-read ( n: fixnum buffer: buffer -- byte-array )
     buffer-read-unsafe swap memory>byte-array ; inline
 
+TYPED: buffer-read-into ( dst n: fixnum buffer: buffer -- count )
+    buffer-read-unsafe swap [
+        pick c-ptr? [
+            memcpy
+        ] [
+            -rot swap
+            [ swap alien-unsigned-1 ]
+            [ set-nth-unsafe ] bi-curry*
+            [ bi ] 2curry each-integer
+        ] if
+    ] keep ; inline
+
 TYPED: buffer-end ( buffer: buffer -- alien )
     [ fill>> ] [ ptr>> ] bi <displaced-alien> ; inline