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lavu/bprint: add av_bprint_get_buffer().

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It is useful to use bprint to handle a growing buffer
used with another API.
This commit is contained in:
Nicolas George 2012-10-28 14:40:30 +01:00
parent 8551c6bec0
commit 483c1aa5f1
3 changed files with 22 additions and 1 deletions
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9
libavutil/bprint.c
View File

@ -129,6 +129,15 @@ void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
av_bprint_grow(buf, n);
}
void av_bprint_get_buffer(AVBPrint *buf, unsigned size,
unsigned char **mem, unsigned *actual_size)
{
if (size > av_bprint_room(buf))
av_bprint_alloc(buf, size);
*actual_size = av_bprint_room(buf);
*mem = *actual_size ? buf->str + buf->len : NULL;
}
void av_bprint_clear(AVBPrint *buf)
{
if (buf->len) {

12
libavutil/bprint.h
View File

@ -125,6 +125,18 @@ void av_bprintf(AVBPrint *buf, const char *fmt, ...) av_printf_format(2, 3);
*/
void av_bprint_chars(AVBPrint *buf, char c, unsigned n);
/**
* Allocate bytes in the buffer for external use.
*
* @param[in] buf buffer structure
* @param[in] size required size
* @param[out] mem pointer to the memory area
* @param[out] actual_size size of the memory area after allocation;
* can be larger or smaller than size
*/
void av_bprint_get_buffer(AVBPrint *buf, unsigned size,
unsigned char **mem, unsigned *actual_size);
/**
* Reset the string to "" but keep internal allocated data.
*/

2
libavutil/version.h
View File

@ -75,7 +75,7 @@
*/
#define LIBAVUTIL_VERSION_MAJOR 52
#define LIBAVUTIL_VERSION_MINOR 1
#define LIBAVUTIL_VERSION_MINOR 2
#define LIBAVUTIL_VERSION_MICRO 100
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \