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Add a function ff_url_join for assembling URLs

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Originally committed as revision 22225 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Martin Storsjö 2010-03-05 22:31:45 +00:00
parent 67d4b3f205
commit 780d7897a9
2 changed files with 73 additions and 0 deletions
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24
libavformat/avformat.h
View File

@ -1350,6 +1350,30 @@ void url_split(char *proto, int proto_size,
char *path, int path_size,
const char *url);
/**
* Assembles a URL string from components. This is the reverse operation
* of url_split.
*
* Note, this requires networking to be initialized, so the caller must
* ensure ff_network_init has been called.
*
* @see url_split
*
* @param str the buffer to fill with the url
* @param size the size of the str buffer
* @param proto the protocol identifier, if null, the separator
* after the identifier is left out, too
* @param authorization an optional authorization string, may be null
* @param hostname the host name string
* @param port the port number, left out from the string if negative
* @param fmt a generic format string for everything to add after the
* host/port, may be null
* @return the number of characters written to the destination buffer
*/
int ff_url_join(char *str, int size, const char *proto,
const char *authorization, const char *hostname,
int port, const char *fmt, ...);
#if LIBAVFORMAT_VERSION_MAJOR < 53
/**
* @deprecated Use av_match_ext() instead.

49
libavformat/utils.c
View File

@ -27,6 +27,10 @@
#include <sys/time.h>
#include <time.h>
#include <strings.h>
#include <stdarg.h>
#if CONFIG_NETWORK
#include "network.h"
#endif
#undef NDEBUG
#include <assert.h>
@ -3446,3 +3450,48 @@ void av_set_pts_info(AVStream *s, int pts_wrap_bits,
if(!s->time_base.num || !s->time_base.den)
s->time_base.num= s->time_base.den= 0;
}
int ff_url_join(char *str, int size, const char *proto,
const char *authorization, const char *hostname,
int port, const char *fmt, ...)
{
#if CONFIG_NETWORK
struct addrinfo hints, *ai;
#endif
str[0] = '\0';
if (proto)
av_strlcatf(str, size, "%s://", proto);
if (authorization)
av_strlcatf(str, size, "%s@", authorization);
#if CONFIG_NETWORK && defined(AF_INET6)
/* Determine if hostname is a numerical IPv6 address,
* properly escape it within [] in that case. */
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_NUMERICHOST;
if (!getaddrinfo(hostname, NULL, &hints, &ai)) {
if (ai->ai_family == AF_INET6) {
av_strlcat(str, "[", size);
av_strlcat(str, hostname, size);
av_strlcat(str, "]", size);
} else {
av_strlcat(str, hostname, size);
}
freeaddrinfo(ai);
} else
#endif
/* Not an IPv6 address, just output the plain string. */
av_strlcat(str, hostname, size);
if (port >= 0)
av_strlcatf(str, size, ":%d", port);
if (fmt) {
va_list vl;
int len = strlen(str);
va_start(vl, fmt);
vsnprintf(str + len, size > len ? size - len : 0, fmt, vl);
va_end(vl);
}
return strlen(str);
}