Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ceph / armor.c

diff --git a/kernel/net/ceph/armor.c b/kernel/net/ceph/armor.c
new file mode 100644 (file)
index 0000000..1fc1ee1
--- /dev/null
+++ b/kernel/net/ceph/armor.c
@@ -0,0 +1,105 @@
+
+#include <linux/errno.h>
+
+int ceph_armor(char *dst, const char *src, const char *end);
+int ceph_unarmor(char *dst, const char *src, const char *end);
+
+/*
+ * base64 encode/decode.
+ */
+
+static const char *pem_key =
+       "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static int encode_bits(int c)
+{
+       return pem_key[c];
+}
+
+static int decode_bits(char c)
+{
+       if (c >= 'A' && c <= 'Z')
+               return c - 'A';
+       if (c >= 'a' && c <= 'z')
+               return c - 'a' + 26;
+       if (c >= '0' && c <= '9')
+               return c - '0' + 52;
+       if (c == '+')
+               return 62;
+       if (c == '/')
+               return 63;
+       if (c == '=')
+               return 0; /* just non-negative, please */
+       return -EINVAL;
+}
+
+int ceph_armor(char *dst, const char *src, const char *end)
+{
+       int olen = 0;
+       int line = 0;
+
+       while (src < end) {
+               unsigned char a, b, c;
+
+               a = *src++;
+               *dst++ = encode_bits(a >> 2);
+               if (src < end) {
+                       b = *src++;
+                       *dst++ = encode_bits(((a & 3) << 4) | (b >> 4));
+                       if (src < end) {
+                               c = *src++;
+                               *dst++ = encode_bits(((b & 15) << 2) |
+                                                    (c >> 6));
+                               *dst++ = encode_bits(c & 63);
+                       } else {
+                               *dst++ = encode_bits((b & 15) << 2);
+                               *dst++ = '=';
+                       }
+               } else {
+                       *dst++ = encode_bits(((a & 3) << 4));
+                       *dst++ = '=';
+                       *dst++ = '=';
+               }
+               olen += 4;
+               line += 4;
+               if (line == 64) {
+                       line = 0;
+                       *(dst++) = '\n';
+                       olen++;
+               }
+       }
+       return olen;
+}
+
+int ceph_unarmor(char *dst, const char *src, const char *end)
+{
+       int olen = 0;
+
+       while (src < end) {
+               int a, b, c, d;
+
+               if (src[0] == '\n') {
+                       src++;
+                       continue;
+               }
+               if (src + 4 > end)
+                       return -EINVAL;
+               a = decode_bits(src[0]);
+               b = decode_bits(src[1]);
+               c = decode_bits(src[2]);
+               d = decode_bits(src[3]);
+               if (a < 0 || b < 0 || c < 0 || d < 0)
+                       return -EINVAL;
+
+               *dst++ = (a << 2) | (b >> 4);
+               if (src[2] == '=')
+                       return olen + 1;
+               *dst++ = ((b & 15) << 4) | (c >> 2);
+               if (src[3] == '=')
+                       return olen + 2;
+               *dst++ = ((c & 3) << 6) | d;
+               olen += 3;
+               src += 4;
+       }
+       return olen;
+}