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add switch_buffer_peek() 

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@16696 d0543943-73ff-0310-b7d9-9358b9ac24b2
This commit is contained in:
Mathieu Rene 2010-02-18 20:22:32 +00:00
parent 6da81efaa5
commit 1f8c1112d6
2 changed files with 26 additions and 0 deletions
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8
src/include/switch_buffer.h
View File

@ -101,6 +101,14 @@ SWITCH_DECLARE(switch_size_t) switch_buffer_inuse(_In_ switch_buffer_t *buffer);
*/
SWITCH_DECLARE(switch_size_t) switch_buffer_read(_In_ switch_buffer_t *buffer, _In_ void *data, _In_ switch_size_t datalen);
/*! \brief Read data from a switch_buffer_t up to the ammount of datalen if it is available, without removing read data from buffer.
* \param buffer any buffer of type switch_buffer_t
* \param data pointer to the read data to be returned
* \param datalen amount of data to be returned
* \return int ammount of data actually read
*/
SWITCH_DECLARE(switch_size_t) switch_buffer_peek(_In_ switch_buffer_t *buffer, _In_ void *data, _In_ switch_size_t datalen);
/*! \brief Read data endlessly from a switch_buffer_t
* \param buffer any buffer of type switch_buffer_t
* \param data pointer to the read data to be returned

18
src/switch_buffer.c
View File

@ -206,6 +206,24 @@ SWITCH_DECLARE(switch_size_t) switch_buffer_read(switch_buffer_t *buffer, void *
return reading;
}
SWITCH_DECLARE(switch_size_t) switch_buffer_peek(switch_buffer_t *buffer, void *data, switch_size_t datalen)
{
switch_size_t reading = 0;
if (buffer->used < 1) {
buffer->used = 0;
return 0;
} else if (buffer->used >= datalen) {
reading = datalen;
} else {
reading = buffer->used;
}
memcpy(data, buffer->head, reading);
return reading;
}
SWITCH_DECLARE(switch_size_t) switch_buffer_write(switch_buffer_t *buffer, const void *data, switch_size_t datalen)
{
switch_size_t freespace, actual_freespace;