1 files changed, 121 insertions, 0 deletions
diff --git a/src/pulsecore/memchunk.c b/src/pulsecore/memchunk.c
new file mode 100644
index 0000000..8822134
--- /dev/null
+++ b/src/pulsecore/memchunk.c
@@ -0,0 +1,121 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 Lennart Poettering
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <pulsecore/macro.h>
+#include <pulsecore/core-util.h>
+
+#include "memchunk.h"
+
+pa_memchunk* pa_memchunk_make_writable(pa_memchunk *c, size_t min) {
+    pa_mempool *pool;
+    pa_memblock *n;
+    size_t l;
+    void *tdata, *sdata;
+
+    pa_assert(c);
+    pa_assert(c->memblock);
+
+    if (pa_memblock_ref_is_one(c->memblock) &&
+        !pa_memblock_is_read_only(c->memblock) &&
+        pa_memblock_get_length(c->memblock) >= c->index+min)
+        return c;
+
+    l = PA_MAX(c->length, min);
+
+    pool = pa_memblock_get_pool(c->memblock);
+    n = pa_memblock_new(pool, l);
+    pa_mempool_unref(pool), pool = NULL;
+
+    sdata = pa_memblock_acquire(c->memblock);
+    tdata = pa_memblock_acquire(n);
+
+    memcpy(tdata, (uint8_t*) sdata + c->index, c->length);
+
+    pa_memblock_release(c->memblock);
+    pa_memblock_release(n);
+
+    pa_memblock_unref(c->memblock);
+
+    c->memblock = n;
+    c->index = 0;
+
+    return c;
+}
+
+pa_memchunk* pa_memchunk_reset(pa_memchunk *c) {
+    pa_assert(c);
+
+    memset(c, 0, sizeof(*c));
+
+    return c;
+}
+
+pa_memchunk *pa_memchunk_will_need(const pa_memchunk *c) {
+    void *p;
+
+    pa_assert(c);
+    pa_assert(c->memblock);
+
+    /* A version of pa_memblock_will_need() that works on memchunks
+     * instead of memblocks */
+
+    p = pa_memblock_acquire_chunk(c);
+    pa_will_need(p, c->length);
+    pa_memblock_release(c->memblock);
+
+    return (pa_memchunk*) c;
+}
+
+pa_memchunk* pa_memchunk_memcpy(pa_memchunk *dst, pa_memchunk *src) {
+    void *p, *q;
+
+    pa_assert(dst);
+    pa_assert(src);
+    pa_assert(dst->length == src->length);
+
+    p = pa_memblock_acquire(dst->memblock);
+    q = pa_memblock_acquire(src->memblock);
+
+    memmove((uint8_t*) p + dst->index,
+            (uint8_t*) q + src->index,
+            dst->length);
+
+    pa_memblock_release(dst->memblock);
+    pa_memblock_release(src->memblock);
+
+    return dst;
+}
+
+bool pa_memchunk_isset(pa_memchunk *chunk) {
+    pa_assert(chunk);
+
+    return
+        chunk->memblock ||
+        chunk->index > 0 ||
+        chunk->length > 0;
+}