git/test-svn-fe.c
Jonathan Nieder fbdd4f6fb4 vcs-svn: cap number of bytes read from sliding view
Introduce a "max_off" field in struct sliding_view, roughly
representing a maximum number of bytes that can be read from "file".
If it is set to a nonnegative integer, a call to move_window()
attempting to put the right endpoint beyond that offset will return
an error instead.

The idea is to use this when applying Subversion-format deltas to
prevent reads past the end of the preimage (which has known length).
Without such a check, corrupt deltas would cause svn-fe to block
indefinitely when data in the input pipe is exhausted.

Inspired-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
2011-06-15 02:15:22 -05:00

55 lines
1.3 KiB
C

/*
* test-svn-fe: Code to exercise the svn import lib
*/
#include "git-compat-util.h"
#include "vcs-svn/svndump.h"
#include "vcs-svn/svndiff.h"
#include "vcs-svn/sliding_window.h"
#include "vcs-svn/line_buffer.h"
static const char test_svnfe_usage[] =
"test-svn-fe (<dumpfile> | [-d] <preimage> <delta> <len>)";
static int apply_delta(int argc, char *argv[])
{
struct line_buffer preimage = LINE_BUFFER_INIT;
struct line_buffer delta = LINE_BUFFER_INIT;
struct sliding_view preimage_view = SLIDING_VIEW_INIT(&preimage, -1);
if (argc != 5)
usage(test_svnfe_usage);
if (buffer_init(&preimage, argv[2]))
die_errno("cannot open preimage");
if (buffer_init(&delta, argv[3]))
die_errno("cannot open delta");
if (svndiff0_apply(&delta, (off_t) strtoull(argv[4], NULL, 0),
&preimage_view, stdout))
return 1;
if (buffer_deinit(&preimage))
die_errno("cannot close preimage");
if (buffer_deinit(&delta))
die_errno("cannot close delta");
buffer_reset(&preimage);
strbuf_release(&preimage_view.buf);
buffer_reset(&delta);
return 0;
}
int main(int argc, char *argv[])
{
if (argc == 2) {
if (svndump_init(argv[1]))
return 1;
svndump_read(NULL);
svndump_deinit();
svndump_reset();
return 0;
}
if (argc >= 2 && !strcmp(argv[1], "-d"))
return apply_delta(argc, argv);
usage(test_svnfe_usage);
}