Initial check in dumb 0.9.2 - has a few usages of floating point that should

be rewritten to fixed point. seems to compile cleanly for iriver.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6197 a1c6a512-1295-4272-9138-f99709370657

apps/codecs/dumb/src/helpers/memfile.c

@@ -0,0 +1,96 @@
+/*  _______         ____    __         ___    ___
+ * \    _  \       \    /  \  /       \   \  /   /       '   '  '
+ *  |  | \  \       |  |    ||         |   \/   |         .      .
+ *  |  |  |  |      |  |    ||         ||\  /|  |
+ *  |  |  |  |      |  |    ||         || \/ |  |         '  '  '
+ *  |  |  |  |      |  |    ||         ||    |  |         .      .
+ *  |  |_/  /        \  \__//          ||    |  |
+ * /_______/ynamic    \____/niversal  /__\  /____\usic   /|  .  . ibliotheque
+ *                                                      /  \
+ *                                                     / .  \
+ * memfile.c - Module for reading data from           / / \  \
+ *             memory using a DUMBFILE.              | <  /   \_
+ *                                                   |  \/ /\   /
+ * By entheh.                                         \_  /  > /
+ *                                                      | \ / /
+ *                                                      |  ' /
+ *                                                       \__/
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "dumb.h"
+
+
+
+typedef struct MEMFILE MEMFILE;
+
+struct MEMFILE
+{
+	const char *ptr;
+	long left;
+};
+
+
+
+static int dumb_memfile_skip(void *f, long n)
+{
+	MEMFILE *m = f;
+	if (n > m->left) return -1;
+	m->ptr += n;
+	m->left -= n;
+	return 0;
+}
+
+
+
+static int dumb_memfile_getc(void *f)
+{
+	MEMFILE *m = f;
+	if (m->left <= 0) return -1;
+	m->left--;
+	return *(const unsigned char *)m->ptr++;
+}
+
+
+
+static long dumb_memfile_getnc(char *ptr, long n, void *f)
+{
+	MEMFILE *m = f;
+	if (n > m->left) n = m->left;
+	memcpy(ptr, m->ptr, n);
+	m->ptr += n;
+	m->left -= n;
+	return n;
+}
+
+
+
+static void dumb_memfile_close(void *f)
+{
+	free(f);
+}
+
+
+
+static DUMBFILE_SYSTEM memfile_dfs = {
+	NULL,
+	&dumb_memfile_skip,
+	&dumb_memfile_getc,
+	&dumb_memfile_getnc,
+	&dumb_memfile_close
+};
+
+
+
+DUMBFILE *dumbfile_open_memory(const char *data, long size)
+{
+	MEMFILE *m = malloc(sizeof(*m));
+	if (!m) return NULL;
+
+	m->ptr = data;
+	m->left = size;
+
+	return dumbfile_open_ex(m, &memfile_dfs);
+}