ostream-buffer.c revision 2454dfa32c93c20a8522c6ed42fe057baaac9f9a
/* Copyright (c) 2002-2017 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "buffer.h"
#include "ostream-private.h"
struct buffer_ostream {
struct ostream_private ostream;
buffer_t *buf;
bool seeked;
};
static int o_stream_buffer_seek(struct ostream_private *stream, uoff_t offset)
{
struct buffer_ostream *bstream = (struct buffer_ostream *)stream;
bstream->seeked = TRUE;
stream->ostream.offset = offset;
return 1;
}
static int
o_stream_buffer_write_at(struct ostream_private *stream,
const void *data, size_t size, uoff_t offset)
{
struct buffer_ostream *bstream = (struct buffer_ostream *)stream;
buffer_write(bstream->buf, offset, data, size);
return 0;
}
static ssize_t
o_stream_buffer_sendv(struct ostream_private *stream,
const struct const_iovec *iov, unsigned int iov_count)
{
struct buffer_ostream *bstream = (struct buffer_ostream *)stream;
size_t left, n, offset;
ssize_t ret = 0;
unsigned int i;
offset = bstream->seeked ? stream->ostream.offset : bstream->buf->used;
for (i = 0; i < iov_count; i++) {
left = bstream->ostream.max_buffer_size -
stream->ostream.offset;
n = I_MIN(left, iov[i].iov_len);
buffer_write(bstream->buf, offset, iov[i].iov_base, n);
stream->ostream.offset += n; offset += n;
ret += n;
if (n != iov[i].iov_len)
break;
}
return ret;
}
struct ostream *o_stream_create_buffer(buffer_t *buf)
{
struct buffer_ostream *bstream;
struct ostream *output;
bstream = i_new(struct buffer_ostream, 1);
/* we don't set buffer as blocking, because if max_buffer_size is
changed it can get truncated. this is used in various places in
unit tests. */
bstream->ostream.max_buffer_size = (size_t)-1;
bstream->ostream.seek = o_stream_buffer_seek;
bstream->ostream.sendv = o_stream_buffer_sendv;
bstream->ostream.write_at = o_stream_buffer_write_at;
bstream->buf = buf;
output = o_stream_create(&bstream->ostream, NULL, -1);
o_stream_set_name(output, "(buffer)");
return output;
}