51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
#ifndef VARINT
|
|
#define VARINT
|
|
#include <stddef.h> /* size_t */
|
|
#include <stdint.h> /* uint8_t, uint64_t */
|
|
|
|
|
|
#define DEFN_ENCODER(SIZE) \
|
|
size_t \
|
|
uvarint_encode##SIZE (uint##SIZE##_t val, uint8_t buf[], size_t bufsize) \
|
|
{ \
|
|
size_t i = 0; \
|
|
for (; i < (SIZE/8) && i < bufsize; i++) { \
|
|
buf[i] = (uint8_t) ((val & 0xFF) | 0x80); \
|
|
val >>= 7; \
|
|
if (!val) \
|
|
return i + 1; \
|
|
} \
|
|
return -1; \
|
|
}
|
|
|
|
|
|
#define DEFN_DECODER(SIZE) \
|
|
size_t \
|
|
uvarint_decode##SIZE (uint8_t buf[], size_t bufsize, uint##SIZE##_t *val) \
|
|
{ \
|
|
*val = 0; \
|
|
size_t i = 0; \
|
|
for (; i < (SIZE/8) && i < bufsize; i++) { \
|
|
*val |= ((buf[i] & 0x7f) << (7 * i)); \
|
|
if (!(buf[i] & 0x80)) \
|
|
return i + 1; \
|
|
} \
|
|
return -1; \
|
|
}
|
|
|
|
|
|
#define DECL_ENCODER(SIZE) \
|
|
size_t \
|
|
uvarint_encode##SIZE (uint##SIZE##_t val, uint8_t buf[], size_t bufsize);
|
|
|
|
#define DECL_DECODER(SIZE) \
|
|
size_t \
|
|
uvarint_decode##SIZE (uint8_t buf[], size_t bufsize, uint##SIZE##_t *val);
|
|
|
|
|
|
DECL_ENCODER(32)
|
|
DECL_DECODER(32)
|
|
|
|
DECL_ENCODER(64)
|
|
DECL_DECODER(64)
|
|
#endif |