FS#6357, patch 3: implemented simple temporary malloc for the Vorbis decoder.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11610 a1c6a512-1295-4272-9138-f99709370657

apps/codecs/Tremor/oggmalloc.c

@@ -0,0 +1,71 @@
+#include <os_types.h>
+
+static unsigned char *mallocbuf;
+static long bufsize, tmp_ptr, mem_ptr;
+
+void ogg_malloc_init(void)
+{
+    mallocbuf = (unsigned char *)ci->get_codec_memory((size_t *)&bufsize);
+    tmp_ptr = bufsize & ~3;
+    mem_ptr = 0;
+}
+
+void *ogg_malloc(size_t size)
+{
+    void* x;
+
+    if (mem_ptr + (long)size > tmp_ptr)
+        return NULL;
+    
+    x = &mallocbuf[mem_ptr];
+    mem_ptr += (size + 3) & ~3; /* Keep memory 32-bit aligned */
+
+    return x;
+}
+
+void *ogg_tmpmalloc(size_t size)
+{
+    if (mem_ptr + (long)size > tmp_ptr)
+        return NULL;
+    
+    tmp_ptr -= (size + 3) & ~3;
+    return &mallocbuf[tmp_ptr];
+}
+
+void *ogg_calloc(size_t nmemb, size_t size)
+{
+    void *x;
+    x = ogg_malloc(nmemb * size);
+    if (x == NULL)
+        return NULL;
+    ci->memset(x, 0, nmemb * size);
+    return x;
+}
+
+void *ogg_tmpcalloc(size_t nmemb, size_t size)
+{
+    void *x;
+    x = ogg_tmpmalloc(nmemb * size);
+    if (x == NULL)
+        return NULL;
+    ci->memset(x, 0, nmemb * size);
+    return x;
+}
+
+void *ogg_realloc(void *ptr, size_t size)
+{
+    void *x;
+    (void)ptr;
+    x = ogg_malloc(size);
+    return x;
+}
+
+long ogg_tmpmalloc_pos(void)
+{
+    return tmp_ptr;
+}
+
+void ogg_tmpmalloc_free(long pos)
+{
+    tmp_ptr = pos;
+}