Add uleb encoding/decoding functions
Implement Unsigned Little Endian Base 128. Signed-off-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
parent
9fb26641ab
commit
e6546bb938
33
cutils.c
33
cutils.c
|
@ -391,3 +391,36 @@ int64_t pow2floor(int64_t value)
|
||||||
}
|
}
|
||||||
return value;
|
return value;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Implementation of ULEB128 (http://en.wikipedia.org/wiki/LEB128)
|
||||||
|
* Input is limited to 14-bit numbers
|
||||||
|
*/
|
||||||
|
int uleb128_encode_small(uint8_t *out, uint32_t n)
|
||||||
|
{
|
||||||
|
g_assert(n <= 0x3fff);
|
||||||
|
if (n < 0x80) {
|
||||||
|
*out++ = n;
|
||||||
|
return 1;
|
||||||
|
} else {
|
||||||
|
*out++ = (n & 0x7f) | 0x80;
|
||||||
|
*out++ = n >> 7;
|
||||||
|
return 2;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
int uleb128_decode_small(const uint8_t *in, uint32_t *n)
|
||||||
|
{
|
||||||
|
if (!(*in & 0x80)) {
|
||||||
|
*n = *in++;
|
||||||
|
return 1;
|
||||||
|
} else {
|
||||||
|
*n = *in++ & 0x7f;
|
||||||
|
/* we exceed 14 bit number */
|
||||||
|
if (*in & 0x80) {
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
*n |= *in++ << 7;
|
||||||
|
return 2;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
|
@ -443,4 +443,12 @@ int64_t pow2floor(int64_t value);
|
||||||
|
|
||||||
#include "module.h"
|
#include "module.h"
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Implementation of ULEB128 (http://en.wikipedia.org/wiki/LEB128)
|
||||||
|
* Input is limited to 14-bit numbers
|
||||||
|
*/
|
||||||
|
|
||||||
|
int uleb128_encode_small(uint8_t *out, uint32_t n);
|
||||||
|
int uleb128_decode_small(const uint8_t *in, uint32_t *n);
|
||||||
|
|
||||||
#endif
|
#endif
|
||||||
|
|
Loading…
Reference in a new issue