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Merge branch 'evbuffer_copyout'

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This commit is contained in:
Nick Mathewson 2010-04-13 01:46:29 -04:00
commit ab30e553c4
2 changed files with 28 additions and 21 deletions
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39
buffer.c
View File

@ -861,15 +861,28 @@ done:
}
/* Reads data from an event buffer and drains the bytes read */
int
evbuffer_remove(struct evbuffer *buf, void *data_out, size_t datlen)
{
ev_ssize_t n;
EVBUFFER_LOCK(buf);
n = evbuffer_copyout(buf, data_out, datlen);
if (n > 0) {
if (evbuffer_drain(buf, n)<0)
n = -1;
}
EVBUFFER_UNLOCK(buf);
return (int)n;
}
ev_ssize_t
evbuffer_copyout(struct evbuffer *buf, void *data_out, size_t datlen)
{
/*XXX fails badly on sendfile case. */
struct evbuffer_chain *chain, *tmp;
struct evbuffer_chain *chain;
char *data = data_out;
size_t nread;
int result = 0;
ev_ssize_t result = 0;
EVBUFFER_LOCK(buf);
@ -893,31 +906,15 @@ evbuffer_remove(struct evbuffer *buf, void *data_out, size_t datlen)
data += chain->off;
datlen -= chain->off;
if (buf->last_with_datap == &chain->next) {
buf->last_with_datap = &buf->first;
}
tmp = chain;
chain = chain->next;
evbuffer_chain_free(tmp);
EVUTIL_ASSERT(chain || datlen==0);
}
buf->first = chain;
if (chain == NULL)
buf->last = NULL;
if (datlen) {
EVUTIL_ASSERT(chain);
memcpy(data, chain->buffer + chain->misalign, datlen);
chain->misalign += datlen;
chain->off -= datlen;
}
buf->total_len -= nread;
buf->n_del_for_cb += nread;
if (nread)
evbuffer_invoke_callbacks(buf);
result = nread;
done:
EVBUFFER_UNLOCK(buf);

10
include/event2/buffer.h
View File

@ -267,6 +267,16 @@ int evbuffer_add(struct evbuffer *buf, const void *data, size_t datlen);
*/
int evbuffer_remove(struct evbuffer *buf, void *data, size_t datlen);
/**
Read data from an event buffer, and leave the buffer unchanged.
@param buf the event buffer to be read from
@param data the destination buffer to store the result
@param datlen the maximum size of the destination buffer
@return the number of bytes read, or -1 if we can't drain the buffer.
*/
ev_ssize_t evbuffer_copyout(struct evbuffer *buf, void *data_out, size_t datlen);
/**
Read data from an event buffer into another event buffer draining
the bytes from the src buffer read. This function avoids memcpy