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/* Copyright (c) 2010-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "istream.h"
#include "ostream-private.h"
#include "ostream-cmp.h"
struct cmp_ostream {
struct ostream_private ostream;
struct istream *input;
bool equals;
};
static void o_stream_cmp_close(struct iostream_private *stream,
bool close_parent)
{
struct cmp_ostream *cstream = (struct cmp_ostream *)stream;
if (cstream->input == NULL)
return;
i_stream_unref(&cstream->input);
if (close_parent)
o_stream_close(cstream->ostream.parent);
}
bool stream_cmp_block(struct istream *input,
const unsigned char *data, size_t size)
{
const unsigned char *indata;
size_t insize, max;
while (size > 0) {
(void)i_stream_read_bytes(input, &indata, &insize, size);
max = I_MIN(insize, size);
if (insize == 0 || memcmp(data, indata, max) != 0)
return FALSE;
data += max;
size -= max;
i_stream_skip(input, max);
}
return TRUE;
}
static ssize_t
o_stream_cmp_sendv(struct ostream_private *stream,
const struct const_iovec *iov, unsigned int iov_count)
{
struct cmp_ostream *cstream = (struct cmp_ostream *)stream;
unsigned int i;
ssize_t ret;
if (cstream->equals) {
for (i = 0; i < iov_count; i++) {
if (!stream_cmp_block(cstream->input, iov[i].iov_base,
iov[i].iov_len)) {
cstream->equals = FALSE;
break;
}
}
}
if ((ret = o_stream_sendv(stream->parent, iov, iov_count)) < 0) {
o_stream_copy_error_from_parent(stream);
return -1;
}
stream->ostream.offset += ret;
return ret;
}
struct ostream *
o_stream_create_cmp(struct ostream *output, struct istream *input)
{
struct cmp_ostream *cstream;
cstream = i_new(struct cmp_ostream, 1);
cstream->ostream.sendv = o_stream_cmp_sendv;
cstream->ostream.iostream.close = o_stream_cmp_close;
cstream->input = input;
cstream->equals = TRUE;
i_stream_ref(input);
return o_stream_create(&cstream->ostream, output,
o_stream_get_fd(output));
}
bool o_stream_cmp_equals(struct ostream *_output)
{
struct cmp_ostream *cstream =
(struct cmp_ostream *)_output->real_stream;
return cstream->equals;
}
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