| #ifndef __CEPH_DECODE_H |
| #define __CEPH_DECODE_H |
| |
| #include <asm/unaligned.h> |
| |
| #include "types.h" |
| |
| /* |
| * in all cases, |
| * void **p pointer to position pointer |
| * void *end pointer to end of buffer (last byte + 1) |
| */ |
| |
| static inline u64 ceph_decode_64(void **p) |
| { |
| u64 v = get_unaligned_le64(*p); |
| *p += sizeof(u64); |
| return v; |
| } |
| static inline u32 ceph_decode_32(void **p) |
| { |
| u32 v = get_unaligned_le32(*p); |
| *p += sizeof(u32); |
| return v; |
| } |
| static inline u16 ceph_decode_16(void **p) |
| { |
| u16 v = get_unaligned_le16(*p); |
| *p += sizeof(u16); |
| return v; |
| } |
| static inline u8 ceph_decode_8(void **p) |
| { |
| u8 v = *(u8 *)*p; |
| (*p)++; |
| return v; |
| } |
| static inline void ceph_decode_copy(void **p, void *pv, size_t n) |
| { |
| memcpy(pv, *p, n); |
| *p += n; |
| } |
| |
| /* |
| * 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_safe(p, end, v, bad) \ |
| do { \ |
| ceph_decode_need(p, end, sizeof(u64), bad); \ |
| v = ceph_decode_64(p); \ |
| } while (0) |
| #define ceph_decode_32_safe(p, end, v, bad) \ |
| do { \ |
| ceph_decode_need(p, end, sizeof(u32), bad); \ |
| v = ceph_decode_32(p); \ |
| } while (0) |
| #define ceph_decode_16_safe(p, end, v, bad) \ |
| do { \ |
| ceph_decode_need(p, end, sizeof(u16), bad); \ |
| v = ceph_decode_16(p); \ |
| } 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 |
| */ |
| static inline void ceph_decode_timespec(struct timespec *ts, |
| const struct ceph_timespec *tv) |
| { |
| ts->tv_sec = le32_to_cpu(tv->tv_sec); |
| ts->tv_nsec = le32_to_cpu(tv->tv_nsec); |
| } |
| static inline void ceph_encode_timespec(struct ceph_timespec *tv, |
| const struct timespec *ts) |
| { |
| tv->tv_sec = cpu_to_le32(ts->tv_sec); |
| tv->tv_nsec = cpu_to_le32(ts->tv_nsec); |
| } |
| |
| /* |
| * sockaddr_storage <-> ceph_sockaddr |
| */ |
| static inline void ceph_encode_addr(struct ceph_entity_addr *a) |
| { |
| a->in_addr.ss_family = htons(a->in_addr.ss_family); |
| } |
| static inline void ceph_decode_addr(struct ceph_entity_addr *a) |
| { |
| a->in_addr.ss_family = ntohs(a->in_addr.ss_family); |
| WARN_ON(a->in_addr.ss_family == 512); |
| } |
| |
| /* |
| * encoders |
| */ |
| static inline void ceph_encode_64(void **p, u64 v) |
| { |
| put_unaligned_le64(v, (__le64 *)*p); |
| *p += sizeof(u64); |
| } |
| static inline void ceph_encode_32(void **p, u32 v) |
| { |
| put_unaligned_le32(v, (__le32 *)*p); |
| *p += sizeof(u32); |
| } |
| static inline void ceph_encode_16(void **p, u16 v) |
| { |
| put_unaligned_le16(v, (__le16 *)*p); |
| *p += sizeof(u16); |
| } |
| static inline void ceph_encode_8(void **p, u8 v) |
| { |
| *(u8 *)*p = v; |
| (*p)++; |
| } |
| static inline void ceph_encode_copy(void **p, const void *s, int len) |
| { |
| memcpy(*p, s, len); |
| *p += len; |
| } |
| |
| /* |
| * 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 |