1 files changed, 91 insertions, 0 deletions
diff --git a/com32/elflink/modules/unbase64.c b/com32/elflink/modules/unbase64.c
new file mode 100644
index 00000000..86ddfc87
--- /dev/null
+++ b/com32/elflink/modules/unbase64.c
@@ -0,0 +1,91 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2005-2008 H. Peter Anvin - All Rights Reserved
+ *
+ *   Permission is hereby granted, free of charge, to any person
+ *   obtaining a copy of this software and associated documentation
+ *   files (the "Software"), to deal in the Software without
+ *   restriction, including without limitation the rights to use,
+ *   copy, modify, merge, publish, distribute, sublicense, and/or
+ *   sell copies of the Software, and to permit persons to whom
+ *   the Software is furnished to do so, subject to the following
+ *   conditions:
+ *
+ *   The above copyright notice and this permission notice shall
+ *   be included in all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ *   OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * unbase64.c
+ *
+ * Convert a string in base64 format to a byte array.
+ */
+
+#include <string.h>
+#include <base64.h>
+#include <sys/module.h>
+
+static int unbase64_init(void)
+{
+    return 0;			// Nothing to do; return success
+}
+
+static const unsigned char _base64chars[] =
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+size_t unbase64(unsigned char *buffer, size_t bufsiz, const char *txt)
+{
+    unsigned int bits = 0;
+    int nbits = 0;
+    char base64tbl[256];
+    int i;
+    char v;
+    size_t nbytes = 0;
+
+    memset(base64tbl, -1, sizeof base64tbl);
+
+    for (i = 0; _base64chars[i]; i++) {
+	base64tbl[_base64chars[i]] = i;
+    }
+
+    /* Also support filesystem safe alternate base64 encoding */
+    base64tbl['.'] = 62;
+    base64tbl['-'] = 62;
+    base64tbl['_'] = 63;
+
+    while (*txt) {
+	if ((v = base64tbl[(unsigned char)*txt]) >= 0) {
+	    bits <<= 6;
+	    bits += v;
+	    nbits += 6;
+	    if (nbits >= 8) {
+		if (nbytes < bufsiz)
+		    *buffer++ = (bits >> (nbits - 8));
+		nbytes++;
+		nbits -= 8;
+	    }
+	}
+	txt++;
+    }
+
+    return nbytes;
+}
+
+static void unbase64_exit(void)
+{
+    // Nothing to do
+}
+
+// Define entry and exit points.
+MODULE_INIT(unbase64_init);
+MODULE_EXIT(unbase64_exit);