Adding upstream version 14.2.upstream/14.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 216 insertions, 0 deletions

diff --git a/src/pulsecore/mcalign.c b/src/pulsecore/mcalign.c
new file mode 100644
index 0000000..df885c2
--- /dev/null
+++ b/src/pulsecore/mcalign.c
@@ -0,0 +1,216 @@
+/***
+  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 <pulse/xmalloc.h>
+#include <pulsecore/macro.h>
+
+#include "mcalign.h"
+
+struct pa_mcalign {
+    size_t base;
+    pa_memchunk leftover, current;
+};
+
+pa_mcalign *pa_mcalign_new(size_t base) {
+    pa_mcalign *m;
+    pa_assert(base);
+
+    m = pa_xnew(pa_mcalign, 1);
+
+    m->base = base;
+    pa_memchunk_reset(&m->leftover);
+    pa_memchunk_reset(&m->current);
+
+    return m;
+}
+
+void pa_mcalign_free(pa_mcalign *m) {
+    pa_assert(m);
+
+    if (m->leftover.memblock)
+        pa_memblock_unref(m->leftover.memblock);
+
+    if (m->current.memblock)
+        pa_memblock_unref(m->current.memblock);
+
+    pa_xfree(m);
+}
+
+void pa_mcalign_push(pa_mcalign *m, const pa_memchunk *c) {
+    pa_assert(m);
+    pa_assert(c);
+
+    pa_assert(c->memblock);
+    pa_assert(c->length > 0);
+
+    pa_assert(!m->current.memblock);
+
+    /* Append to the leftover memory block */
+    if (m->leftover.memblock) {
+
+        /* Try to merge */
+        if (m->leftover.memblock == c->memblock &&
+            m->leftover.index + m->leftover.length == c->index) {
+
+            /* Merge */
+            m->leftover.length += c->length;
+
+            /* If the new chunk is larger than m->base, move it to current */
+            if (m->leftover.length >= m->base) {
+                m->current = m->leftover;
+                pa_memchunk_reset(&m->leftover);
+            }
+
+        } else {
+            size_t l;
+            void *lo_data, *m_data;
+
+            /* We have to copy */
+            pa_assert(m->leftover.length < m->base);
+            l = m->base - m->leftover.length;
+
+            if (l > c->length)
+                l = c->length;
+
+            /* Can we use the current block? */
+            pa_memchunk_make_writable(&m->leftover, m->base);
+
+            lo_data = pa_memblock_acquire(m->leftover.memblock);
+            m_data = pa_memblock_acquire(c->memblock);
+            memcpy((uint8_t*) lo_data + m->leftover.index + m->leftover.length, (uint8_t*) m_data + c->index, l);
+            pa_memblock_release(m->leftover.memblock);
+            pa_memblock_release(c->memblock);
+            m->leftover.length += l;
+
+            pa_assert(m->leftover.length <= m->base);
+            pa_assert(m->leftover.length <= pa_memblock_get_length(m->leftover.memblock));
+
+            if (c->length > l) {
+                /* Save the remainder of the memory block */
+                m->current = *c;
+                m->current.index += l;
+                m->current.length -= l;
+                pa_memblock_ref(m->current.memblock);
+            }
+        }
+    } else {
+        /* Nothing to merge or copy, just store it */
+
+        if (c->length >= m->base)
+            m->current = *c;
+        else
+            m->leftover = *c;
+
+        pa_memblock_ref(c->memblock);
+    }
+}
+
+int pa_mcalign_pop(pa_mcalign *m, pa_memchunk *c) {
+    pa_assert(m);
+    pa_assert(c);
+
+    /* First test if there's a leftover memory block available */
+    if (m->leftover.memblock) {
+        pa_assert(m->leftover.length > 0);
+        pa_assert(m->leftover.length <= m->base);
+
+        /* The leftover memory block is not yet complete */
+        if (m->leftover.length < m->base)
+            return -1;
+
+        /* Return the leftover memory block */
+        *c = m->leftover;
+        pa_memchunk_reset(&m->leftover);
+
+        /* If the current memblock is too small move it the leftover */
+        if (m->current.memblock && m->current.length < m->base) {
+            m->leftover = m->current;
+            pa_memchunk_reset(&m->current);
+        }
+
+        return 0;
+    }
+
+    /* Now let's see if there is other data available */
+    if (m->current.memblock) {
+        size_t l;
+        pa_assert(m->current.length >= m->base);
+
+        /* The length of the returned memory block */
+        l = m->current.length;
+        l /= m->base;
+        l *= m->base;
+        pa_assert(l > 0);
+
+        /* Prepare the returned block */
+        *c = m->current;
+        pa_memblock_ref(c->memblock);
+        c->length = l;
+
+        /* Drop that from the current memory block */
+        pa_assert(l <= m->current.length);
+        m->current.index += l;
+        m->current.length -= l;
+
+        /* In case the whole block was dropped ... */
+        if (m->current.length == 0)
+            pa_memblock_unref(m->current.memblock);
+        else {
+            /* Move the remainder to leftover */
+            pa_assert(m->current.length < m->base && !m->leftover.memblock);
+
+            m->leftover = m->current;
+        }
+
+        pa_memchunk_reset(&m->current);
+
+        return 0;
+    }
+
+    /* There's simply nothing */
+    return -1;
+}
+
+size_t pa_mcalign_csize(pa_mcalign *m, size_t l) {
+    pa_assert(m);
+    pa_assert(l > 0);
+
+    pa_assert(!m->current.memblock);
+
+    if (m->leftover.memblock)
+        l += m->leftover.length;
+
+    return (l/m->base)*m->base;
+}
+
+void pa_mcalign_flush(pa_mcalign *m) {
+    pa_memchunk chunk;
+    pa_assert(m);
+
+    while (pa_mcalign_pop(m, &chunk) >= 0)
+        pa_memblock_unref(chunk.memblock);
+}