diff options
Diffstat (limited to 'src/helper/binarybuffer.c')
| -rw-r--r-- | src/helper/binarybuffer.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/helper/binarybuffer.c b/src/helper/binarybuffer.c index 5defcda4..6fe3664a 100644 --- a/src/helper/binarybuffer.c +++ b/src/helper/binarybuffer.c @@ -397,3 +397,24 @@ int hexify(char *hex, const char *bin, int count, int out_maxlen) return cmd_len; } + +void buffer_shr(void *_buf, unsigned buf_len, unsigned count) +{ + unsigned i; + unsigned char *buf = _buf; + unsigned bytes_to_remove; + unsigned shift; + + bytes_to_remove = count / 8; + shift = count - (bytes_to_remove * 8); + + for (i = 0; i < (buf_len - 1); i++) + buf[i] = (buf[i] >> shift) | ((buf[i+1] << (8 - shift)) & 0xff); + + buf[(buf_len - 1)] = buf[(buf_len - 1)] >> shift; + + if (bytes_to_remove) { + memmove(buf, &buf[bytes_to_remove], buf_len - bytes_to_remove); + memset(&buf[buf_len - bytes_to_remove], 0, bytes_to_remove); + } +} |