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avio: Add avio_read wrapper to simplify error checking 

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Vittorio Giovara 2015-05-26 14:24:38 +01:00 committed by Luca Barbato
parent cffb9ea81b
commit bff0349d9d
2 changed files with 15 additions and 0 deletions
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7
libavformat/avio_internal.h
View File

@ -85,6 +85,13 @@ int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size
uint64_t ffio_read_varlen(AVIOContext *bc);
/**
* Read size bytes from AVIOContext into buf.
* Check that exactly size bytes have been read.
* @return number of bytes read or AVERROR
*/
int ffio_read_size(AVIOContext *s, unsigned char *buf, int size);
/** @warning must be called before any I/O */
int ffio_set_buf_size(AVIOContext *s, int buf_size);

8
libavformat/aviobuf.c
View File

@ -496,6 +496,14 @@ int avio_read(AVIOContext *s, unsigned char *buf, int size)
return size1 - size;
}
int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
{
int ret = avio_read(s, buf, size);
if (ret != size)
return AVERROR_INVALIDDATA;
return ret;
}
int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
{
if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {