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input_stream: return allocated input_stream objects

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Major API redesign: don't let the caller allocate the input_stream
object.  Let each input plugin allocate its own (derived/extended)
input_stream pointer.  The "data" attribute can now be removed, and
all input plugins simply cast the input_stream pointer to their own
structure (with an "struct input_stream base" as the first attribute).
This commit is contained in:
Max Kellermann
2009-12-30 23:27:37 +01:00
parent 816b6ad4a7
commit d3b763a48c
25 changed files with 315 additions and 326 deletions
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27
src/input_stream.h
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@@ -38,11 +38,6 @@ struct input_stream {
*/
const struct input_plugin *plugin;
/**
* an opaque pointer managed by the plugin
*/
void *data;
/**
* indicates whether the stream is ready for reading and
* whether the other attributes in this struct are valid
@@ -70,20 +65,28 @@ struct input_stream {
char *mime;
};
static inline void
input_stream_init(struct input_stream *is, const struct input_plugin *plugin)
{
is->plugin = plugin;
is->ready = false;
is->seekable = false;
is->size = -1;
is->offset = 0;
is->mime = NULL;
}
/**
* Opens a new input stream. You may not access it until the "ready"
* flag is set.
*
* @param is the input_stream object allocated by the caller
* @return true on success
* @return an #input_stream object on success, NULL on error
*/
bool
input_stream_open(struct input_stream *is, const char *url, GError **error_r);
struct input_stream *
input_stream_open(const char *uri, GError **error_r);
/**
* Closes the input stream and free resources. This does not free the
* input_stream pointer itself, because it is assumed to be allocated
* by the caller.
* Close the input stream and free resources.
*/
void
input_stream_close(struct input_stream *is);