X-Git-Url: http://git.indexdata.com/?a=blobdiff_plain;f=src%2Fbase64.c;fp=src%2Fbase64.c;h=d007a34976a292e5d52cf7d68b32935c6fcabbe6;hb=d78eafbc5889e1f4602116cf6627b1f0dc1da100;hp=0000000000000000000000000000000000000000;hpb=59aa88eb085c71e191802510804588a4f9edbe9b;p=yaz-moved-to-github.git

diff --git a/src/base64.c b/src/base64.c
new file mode 100644
index 0000000..d007a34
--- /dev/null
+++ b/src/base64.c
@@ -0,0 +1,111 @@
+/* This file is part of the YAZ toolkit.
+ * Copyright (C) 1995-2011 Index Data
+ * See the file LICENSE for details.
+ */
+/**
+ * \file base64.c
+ * \brief Base64 encode/decode utilities
+ */
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+#include <yaz/base64.h>
+
+void yaz_base64encode(const char *in, char *out)
+{
+    static char encoding[] =
+        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+    unsigned char buf[3];
+    long n;
+
+    while (*in != 0)
+    {
+	const char *pad = 0;
+        buf[0] = in[0];
+	buf[1] = in[1];
+	if (in[1] == 0)
+        {
+	    buf[2] = 0;
+	    pad = "==";
+	}
+        else
+        {
+	    buf[2] = in[2];
+	    if (in[2] == 0)
+		pad = "=";
+	}
+
+	/* Treat three eight-bit numbers as on 24-bit number */
+	n = (buf[0] << 16) + (buf[1] << 8) + buf[2];
+
+	/* Write the six-bit chunks out as four encoded characters */
+	*out++ = encoding[(n >> 18) & 63];
+	*out++ = encoding[(n >> 12) & 63];
+	if (in[1] != 0)
+	    *out++ = encoding[(n >> 6) & 63];
+	if (in[1] != 0 && in[2] != 0)
+	    *out++ = encoding[n & 63];
+
+	if (pad != 0) {
+	    while (*pad != 0)
+		*out++ = *pad++;
+	    break;
+	}
+	in += 3;
+    }
+    *out++ = 0;
+}
+
+int yaz_base64decode(const char *in, char *out)
+{
+    const char *map = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	"abcdefghijklmnopqrstuvwxyz0123456789+/";
+    int len = strlen(in);
+
+    while (len >= 4)
+    {
+	char i0, i1, i2, i3;
+	char *p;
+
+	if (!(p = strchr(map, in[0])))
+	    return -1;
+	i0 = p - map;
+	len--;
+	if (!(p = strchr(map, in[1])))
+	    return -1;
+	i1 = p - map;
+	len--;
+	*(out++) = i0 << 2 | i1 >> 4;
+	if (in[2] == '=')
+	    break;
+	if (!(p = strchr(map, in[2])))
+	    return -1;
+	i2 = p - map;
+	len--;
+	*(out++) = i1 << 4 | i2 >> 2;
+	if (in[3] == '=')
+	    break;
+	if (!(p = strchr(map, in[3])))
+	    return -1;
+	i3 = p - map;
+	len--;
+	*(out++) = i2 << 6 | i3;
+
+	in += 4;
+    }
+
+    *out = '\0';
+    return 0;
+}
+
+/*
+ * Local variables:
+ * c-basic-offset: 4
+ * c-file-style: "Stroustrup"
+ * indent-tabs-mode: nil
+ * End:
+ * vim: shiftwidth=4 tabstop=8 expandtab
+ */
+