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