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input_stream: make seek(), buffer() optional

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Make those two methods optional to implement, and let input_stream.c
provide fallbacks.  The buffer() method will be removed one day, and
there is now only one implementation left (input_curl.c).
This commit is contained in:
Max Kellermann
2009-01-30 00:58:03 +01:00
parent 82cfce76eb
commit 32d6d4499e
5 changed files with 7 additions and 44 deletions
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7
src/input_stream.c
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@@ -86,6 +86,7 @@ input_stream_open(struct input_stream *is, const char *url)
assert(is->plugin->close != NULL);
assert(is->plugin->read != NULL);
assert(is->plugin->eof != NULL);
assert(!is->seekable || is->plugin->seek != NULL);
return true;
}
@@ -97,6 +98,9 @@ input_stream_open(struct input_stream *is, const char *url)
bool
input_stream_seek(struct input_stream *is, off_t offset, int whence)
{
if (is->plugin->seek == NULL)
return false;
return is->plugin->seek(is, offset, whence);
}
@@ -133,5 +137,8 @@ bool input_stream_eof(struct input_stream *is)
int input_stream_buffer(struct input_stream *is)
{
if (is->plugin->buffer == NULL)
return 0;
return is->plugin->buffer(is);
}