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#ifndef __CEPH_DECODE_H
#define __CEPH_DECODE_H
#include <asm/unaligned.h>
/*
* in all cases,
* void **p pointer to position pointer
* void *end pointer to end of buffer (last byte + 1)
*/
/*
* bounds check input.
*/
#define ceph_decode_need(p, end, n, bad) \
do { \
if (unlikely(*(p) + (n) > (end))) \
goto bad; \
} while (0)
#define ceph_decode_64(p, v) \
do { \
v = get_unaligned_le64(*(p)); \
*(p) += sizeof(u64); \
} while (0)
#define ceph_decode_32(p, v) \
do { \
v = get_unaligned_le32(*(p)); \
*(p) += sizeof(u32); \
} while (0)
#define ceph_decode_16(p, v) \
do { \
v = get_unaligned_le16(*(p)); \
*(p) += sizeof(u16); \
} while (0)
#define ceph_decode_8(p, v) \
do { \
v = *(u8 *)*(p); \
(*p)++; \
} while (0)
#define ceph_decode_copy(p, pv, n) \
do { \
memcpy(pv, *(p), n); \
*(p) += n; \
} while (0)
/* bounds check too */
#define ceph_decode_64_safe(p, end, v, bad) \
do { \
ceph_decode_need(p, end, sizeof(u64), bad); \
ceph_decode_64(p, v); \
} while (0)
#define ceph_decode_32_safe(p, end, v, bad) \
do { \
ceph_decode_need(p, end, sizeof(u32), bad); \
ceph_decode_32(p, v); \
} while (0)
#define ceph_decode_16_safe(p, end, v, bad) \
do { \
ceph_decode_need(p, end, sizeof(u16), bad); \
ceph_decode_16(p, v); \
} while (0)
#define ceph_decode_copy_safe(p, end, pv, n, bad) \
do { \
ceph_decode_need(p, end, n, bad); \
ceph_decode_copy(p, pv, n); \
} while (0)
/*
* struct ceph_timespec <-> struct timespec
*/
#define ceph_decode_timespec(ts, tv) \
do { \
(ts)->tv_sec = le32_to_cpu((tv)->tv_sec); \
(ts)->tv_nsec = le32_to_cpu((tv)->tv_nsec); \
} while (0)
#define ceph_encode_timespec(tv, ts) \
do { \
(tv)->tv_sec = cpu_to_le32((ts)->tv_sec); \
(tv)->tv_nsec = cpu_to_le32((ts)->tv_nsec); \
} while (0)
/*
* encoders
*/
#define ceph_encode_64(p, v) \
do { \
put_unaligned_le64(v, (__le64 *)*(p)); \
*(p) += sizeof(u64); \
} while (0)
#define ceph_encode_32(p, v) \
do { \
put_unaligned_le32(v, (__le32 *)*(p)); \
*(p) += sizeof(u32); \
} while (0)
#define ceph_encode_16(p, v) \
do { \
put_unaligned_le16(v), (__le16 *)*(p)); \
*(p) += sizeof(u16); \
} while (0)
#define ceph_encode_8(p, v) \
do { \
*(u8 *)*(p) = v; \
(*(p))++; \
} while (0)
/*
* filepath, string encoders
*/
static inline void ceph_encode_filepath(void **p, void *end,
u64 ino, const char *path)
{
u32 len = path ? strlen(path) : 0;
BUG_ON(*p + sizeof(ino) + sizeof(len) + len > end);
ceph_encode_64(p, ino);
ceph_encode_32(p, len);
if (len)
memcpy(*p, path, len);
*p += len;
}
static inline void ceph_encode_string(void **p, void *end,
const char *s, u32 len)
{
BUG_ON(*p + sizeof(len) + len > end);
ceph_encode_32(p, len);
if (len)
memcpy(*p, s, len);
*p += len;
}
#endif
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