feat: wrap ringbuffer API and add usage example

Signed-off-by: Christopher Arndt <chris@chrisarndt.de>

README.md

@@ -8,11 +8,10 @@ A [Nim] wrapper for the [JACK] [C API]
 This software is in *alpha status* and has no official release yet.
 
 The majority of JACK client APIs have been wrapped and are functional (see
-[examples]), but some APIs (e.g. threading and ringbuffers) still need
-wrapping. Others, like the server control or the deprecated session API, will
-probably not covered by these bindings. While this project is in alpha or beta
-stage, symbol names may still be changed and things moved around before the
-first public release.
+[examples]), but some APIs (e.g. threading) still need wrapping. Others, like
+the server control or the deprecated session API, will probably not covered by
+these bindings. While this project is in alpha or beta stage, symbol names may
+still be changed and things moved around before the first public release.
 
 Also, I plan to add a higher-level abstraction on top of the direct mapping
 from Nim procs and types to C functions and types, probably in the form of

examples/jacket_ringbuffer.nim

@@ -0,0 +1,49 @@
+import std/[logging, strformat]
+import jacket
+
+var log = newConsoleLogger(when defined(release): lvlInfo else: lvlDebug)
+
+
+proc main() =
+    addHandler(log)
+
+    let size = 32
+    var read, written: int
+    var data = [0x64.uint8, 0x65, 0x61, 0x64, 0x62, 0x65, 0x65, 0x66]
+    var recvBuf: array[8, uint8]
+
+    let rb = ringbufferCreate(size.csize_t)
+    debug fmt"Created ringbuffer of {size} bytes size."
+
+    doAssert ringbufferReadSpace(rb) == 0
+
+    written = cast[int](ringbufferWrite(rb, cast[cstring](data.addr), 4))
+    doAssert written == 4
+    debug fmt"Written {written} bytes to ringbuffer."
+
+    doAssert ringbufferReadSpace(rb) == 4
+
+    written = cast[int](ringbufferWrite(rb, cast[cstring](data[4].addr), 4))
+    doAssert written == 4
+    debug fmt"Written {written} bytes to ringbuffer."
+
+    doAssert ringbufferReadSpace(rb) == 8
+
+    read = cast[int](ringbufferRead(rb, cast[cstring](recvBuf.addr), 4))
+    doAssert read == 4
+    debug fmt"Read {read} bytes from ringbuffer into receive buffer: {recvBuf}"
+
+    doAssert ringbufferReadSpace(rb) == 4
+
+    read = cast[int](ringbufferRead(rb, cast[cstring](recvBuf[4].addr), 4))
+    doAssert read == 4
+    debug fmt"Read {read} bytes from ringbuffer into receive buffer: {recvBuf}"
+
+    doAssert ringbufferReadSpace(rb) == 0
+
+    debug "Freeing ringbuffer memory."
+    ringbufferFree(rb)
+
+
+when(isMainModule):
+    main()

src/jacket.nim

@@ -172,6 +172,17 @@ const
     EXTENDED_TIME_INFO* = true
     JACK_TICK_DOUBLE* = true
 
+# Ringbuffer
+
+type
+    RingbufferData* = object
+        buf*: ptr char
+        len*: csize_t
+    RingbufferDataP* = ptr RingbufferData
+
+    Ringbuffer = distinct object
+    RingbufferP* = ptr Ringbuffer
+
 # Metadata
 
 type
@@ -643,6 +654,47 @@ void jack_get_transport_info (jack_client_t *client, jack_transport_info_t *tinf
 void jack_set_transport_info (jack_client_t *client, jack_transport_info_t *tinfo)
 ]#
 
+# ----------------------------- Ringbuffers -------------------------------
+
+# jack_ringbuffer_t *jack_ringbuffer_create (size_t sz)
+proc ringbufferCreate*(sz: csize_t): RingbufferP {.importc: "jack_ringbuffer_create".}
+
+# void jack_ringbuffer_free (jack_ringbuffer_t *rb)
+proc ringbufferFree*(rb: RingbufferP) {.importc: "jack_ringbuffer_free".}
+
+# void jack_ringbuffer_get_read_vector (const jack_ringbuffer_t *rb, jack_ringbuffer_data_t *vec)
+proc ringbufferGetReadVector*(rb: RingbufferP, vec: var RingbufferDataP) {.importc: "jack_ringbuffer_get_read_vector".}
+
+# void jack_ringbuffer_get_write_vector (const jack_ringbuffer_t *rb, jack_ringbuffer_data_t *vec)
+proc ringbufferGetWriteVector*(rb: RingbufferP, vec: var RingbufferDataP) {.importc: "jack_ringbuffer_get_write_vector".}
+
+# size_t jack_ringbuffer_read (jack_ringbuffer_t *rb, char *dest, size_t cnt)
+proc ringbufferRead*(rb: RingbufferP, dest: cstring, cnt: csize_t): csize_t {.importc: "jack_ringbuffer_read".}
+
+# size_t jack_ringbuffer_peek (jack_ringbuffer_t *rb, char *dest, size_t cnt)
+proc ringbufferPeek*(rb: RingbufferP, dest: cstring, cnt: csize_t): csize_t {.importc: "jack_ringbuffer_peek".}
+
+# void jack_ringbuffer_read_advance (jack_ringbuffer_t *rb, size_t cnt)
+proc ringbufferReadAdvance*(rb: RingbufferP, cnt: csize_t) {.importc: "jack_ringbuffer_read_advance".}
+
+# size_t jack_ringbuffer_read_space (const jack_ringbuffer_t *rb)
+proc ringbufferReadSpace*(rb: RingbufferP): csize_t {.importc: "jack_ringbuffer_read_space".}
+
+# int jack_ringbuffer_mlock (jack_ringbuffer_t *rb)
+proc ringbufferMlock*(rb: RingbufferP): int {.importc: "jack_ringbuffer_mlock".}
+
+# void jack_ringbuffer_reset (jack_ringbuffer_t *rb)
+proc ringbufferReset*(rb: RingbufferP) {.importc: "jack_ringbuffer_reset".}
+
+# size_t jack_ringbuffer_write (jack_ringbuffer_t *rb, const char *src, size_t cnt)
+proc ringbufferWrite*(rb: RingbufferP, src: cstring, cnt: csize_t): csize_t {.importc: "jack_ringbuffer_write".}
+
+# void jack_ringbuffer_write_advance (jack_ringbuffer_t *rb, size_t cnt)
+proc ringbufferWriteAdvance*(rb: RingbufferP, cnt: csize_t) {.importc: "jack_ringbuffer_write_advance".}
+
+# size_t jack_ringbuffer_write_space (const jack_ringbuffer_t *rb)
+proc ringbufferWriteSpace*(rb: RingbufferP): csize_t {.importc: "jack_ringbuffer_write_space".}
+
 # ------------------------------- Metadata --------------------------------
 
 # int jack_set_property (jack_client_t*, jack_uuid_t subject, const char* key, const char* value, const char* type)