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input_curl: try to seek by fast-forwarding the buffer

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If the caller attempts to seek only a few bytes forward, chances are
good that the offset is already in the buffer.  In this case, simply
fast-forward the buffer.
This commit is contained in:
Max Kellermann 2008-11-21 17:10:20 +01:00
parent 46df0fd7dc
commit 695d8051d2
1 changed files with 26 additions and 0 deletions
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26
src/input_curl.c
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@ -604,6 +604,32 @@ input_curl_seek(struct input_stream *is, off_t offset, int whence)
if (offset < 0)
return false;
/* check if we can fast-forward the buffer */
while (offset > is->offset && !list_empty(&c->buffers)) {
struct list_head *rewind_head;
struct buffer *buffer = (struct buffer *)c->buffers.next;
size_t length;
if (!list_empty(&c->rewind) || is->offset == 0)
/* at the beginning or already writing the rewind
buffer list */
rewind_head = &c->rewind;
else
/* we don't need the rewind buffers anymore */
rewind_head = NULL;
length = buffer->size - buffer->consumed;
if (offset - is->offset < (off_t)length)
length = offset - is->offset;
consume_buffer(buffer, length, rewind_head);
is->offset += length;
}
if (offset == is->offset)
return true;
/* close the old connection and open a new one */
input_curl_easy_free(c);