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Make url_read_complete retry on EAGAIN and return how much data it read

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if it reached EOF, making it useful in more cases.

Originally committed as revision 21393 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2010-01-23 10:23:47 +00:00
parent 98287358e9
commit ddb901b74d
2 changed files with 12 additions and 2 deletions
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6
libavformat/avio.c
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@ -156,8 +156,10 @@ int url_read_complete(URLContext *h, unsigned char *buf, int size)
len = 0; len = 0;
while (len < size) { while (len < size) {
ret = url_read(h, buf+len, size-len); ret = url_read(h, buf+len, size-len);
if (ret < 1) if (ret == AVERROR(EAGAIN)) {
return ret; ret = 0;
} else if (ret < 1)
return ret < 0 ? ret : len;
len += ret; len += ret;
} }
return len; return len;

8
libavformat/avio.h
View file

@ -69,6 +69,14 @@ int url_open_protocol (URLContext **puc, struct URLProtocol *up,
const char *filename, int flags); const char *filename, int flags);
int url_open(URLContext **h, const char *filename, int flags); int url_open(URLContext **h, const char *filename, int flags);
int url_read(URLContext *h, unsigned char *buf, int size); int url_read(URLContext *h, unsigned char *buf, int size);
/**
* Read as many bytes as possible (up to size), calling the
* read function multiple times if necessary.
* Will also retry if the read function returns AVERROR(EAGAIN).
* This makes special short-read handling in applications
* unnecessary, if the return value is < size then it is
* certain there was either an error or the end of file was reached.
*/
int url_read_complete(URLContext *h, unsigned char *buf, int size); int url_read_complete(URLContext *h, unsigned char *buf, int size);
int url_write(URLContext *h, unsigned char *buf, int size); int url_write(URLContext *h, unsigned char *buf, int size);
int64_t url_seek(URLContext *h, int64_t pos, int whence); int64_t url_seek(URLContext *h, int64_t pos, int whence);