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ddcc8c5b46
A delta in the subversion delta (svndiff0) format consists of the magic bytes SVN\0 followed by a sequence of windows of a certain well specified format (starting with five integers). Add an svndiff0_apply function and test-svn-fe -d commandline tool to parse such a delta in the special case of not including any windows. Later patches will add features to turn this into a fully functional delta applier for svn-fe to use to parse the streams produced by "svnrdump dump" and "svnadmin dump --deltas". The content of symlinks starts with the word "link " in Subversion's worldview, so we need to be able to prepend that text to input for the sake of delta application. So initialization of the input state of the delta preimage is left to the calling program, giving callers a chance to seed the buffer with text of their choice. Improved-by: Ramkumar Ramachandra <artagnon@gmail.com> Improved-by: David Barr <david.barr@cordelta.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/*
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* test-svn-fe: Code to exercise the svn import lib
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*/
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#include "git-compat-util.h"
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#include "vcs-svn/svndump.h"
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#include "vcs-svn/svndiff.h"
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#include "vcs-svn/sliding_window.h"
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#include "vcs-svn/line_buffer.h"
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int main(int argc, char *argv[])
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{
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static const char test_svnfe_usage[] =
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"test-svn-fe (<dumpfile> | [-d] <preimage> <delta> <len>)";
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if (argc == 2) {
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if (svndump_init(argv[1]))
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return 1;
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svndump_read(NULL);
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svndump_deinit();
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svndump_reset();
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return 0;
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}
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if (argc == 5 && !strcmp(argv[1], "-d")) {
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struct line_buffer preimage = LINE_BUFFER_INIT;
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struct line_buffer delta = LINE_BUFFER_INIT;
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struct sliding_view preimage_view = SLIDING_VIEW_INIT(&preimage);
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if (buffer_init(&preimage, argv[2]))
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die_errno("cannot open preimage");
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if (buffer_init(&delta, argv[3]))
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die_errno("cannot open delta");
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if (svndiff0_apply(&delta, (off_t) strtoull(argv[4], NULL, 0),
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&preimage_view, stdout))
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return 1;
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if (buffer_deinit(&preimage))
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die_errno("cannot close preimage");
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if (buffer_deinit(&delta))
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die_errno("cannot close delta");
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buffer_reset(&preimage);
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strbuf_release(&preimage_view.buf);
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buffer_reset(&delta);
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return 0;
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}
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usage(test_svnfe_usage);
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}
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