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#if defined(__linux__)
#include <linux/errno.h>
#else
#include <sys/errno.h>
#endif
/*
* base64 encode/decode.
*/
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 == '+' || c == '-')
return 62;
if (c == '/' || c == '_')
return 63;
if (c == '=')
return 0; /* just non-negative, please */
return -EINVAL;
}
static int set_str_val(char **pdst, const char *end, char c)
{
if (*pdst < end) {
char *p = *pdst;
*p = c;
(*pdst)++;
} else
return -ERANGE;
return 0;
}
int ceph_armor_line_break(char *dst, char * const dst_end, const char *src, const char *end, int line_width)
{
int olen = 0;
int line = 0;
#define SET_DST(c) do { \
int __ret = set_str_val(&dst, dst_end, c); \
if (__ret < 0) \
return __ret; \
} while (0);
while (src < end) {
unsigned char a;
a = *src++;
SET_DST(encode_bits(a >> 2));
if (src < end) {
unsigned char b;
b = *src++;
SET_DST(encode_bits(((a & 3) << 4) | (b >> 4)));
if (src < end) {
unsigned char c;
c = *src++;
SET_DST(encode_bits(((b & 15) << 2) |
(c >> 6)));
SET_DST(encode_bits(c & 63));
} else {
SET_DST(encode_bits((b & 15) << 2));
SET_DST('=');
}
} else {
SET_DST(encode_bits(((a & 3) << 4)));
SET_DST('=');
SET_DST('=');
}
olen += 4;
line += 4;
if (line_width && line == line_width) {
line = 0;
SET_DST('\n');
olen++;
}
}
return olen;
}
int ceph_armor(char *dst, char * const dst_end, const char *src, const char *end)
{
return ceph_armor_line_break(dst, dst_end, src, end, 0);
}
int ceph_unarmor(char *dst, char * const dst_end, 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;
SET_DST((a << 2) | (b >> 4));
if (src[2] == '=')
return olen + 1;
SET_DST(((b & 15) << 4) | (c >> 2));
if (src[3] == '=')
return olen + 2;
SET_DST(((c & 3) << 6) | d);
olen += 3;
src += 4;
}
return olen;
}
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