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Add a zero-copy buffer move implementation.

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This commit is contained in:
Nick Mathewson 2017-09-06 09:30:50 -04:00
parent 5240d02a11
commit 095e15f8ac
2 changed files with 23 additions and 0 deletions
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22
src/common/buffers.c
View File

@ -838,6 +838,28 @@ buf_move_to_buf(buf_t *buf_out, buf_t *buf_in, size_t *buf_flushlen)
return (int)cp;
}
/** Moves all data from <b>buf_in</b> to <b>buf_out</b>, without copying.
*/
void
buf_move_all(buf_t *buf_out, buf_t *buf_in)
{
tor_assert(buf_out);
if (!buf_in)
return;
if (buf_out->head == NULL) {
buf_out->head = buf_in->head;
buf_out->tail = buf_in->tail;
} else {
buf_out->tail->next = buf_in->head;
buf_out->tail = buf_in->tail;
}
buf_out->datalen += buf_in->datalen;
buf_in->head = buf_in->tail = NULL;
buf_in->datalen = 0;
}
/** Internal structure: represents a position in a buffer. */
typedef struct buf_pos_t {
const chunk_t *chunk; /**< Which chunk are we pointing to? */

1
src/common/buffers.h
View File

@ -51,6 +51,7 @@ void buf_add_vprintf(buf_t *buf, const char *format, va_list args)
int buf_add_compress(buf_t *buf, struct tor_compress_state_t *state,
const char *data, size_t data_len, int done);
int buf_move_to_buf(buf_t *buf_out, buf_t *buf_in, size_t *buf_flushlen);
void buf_move_all(buf_t *buf_out, buf_t *buf_in);
void buf_peek(const buf_t *buf, char *string, size_t string_len);
void buf_drain(buf_t *buf, size_t n);
int buf_get_bytes(buf_t *buf, char *string, size_t string_len);