git/vcs-svn at 9d2f5ddfe56fcc228a36dd079f0897e0f474eb4e - git

Tree: 9d2f5ddfe5

Jonathan Nieder 9d2f5ddfe5 vcs-svn: learn to maintain a sliding view of a file Each section of a Subversion-format delta only requires examining (and keeping in random-access memory) a small portion of the preimage. At any moment, this portion starts at a certain file offset and has a well-defined length, and as the delta is applied, the portion advances from the beginning to the end of the preimage. Add a move_window function to keep track of this view into the preimage. You can use it like this: buffer_init(f, NULL); struct sliding_view window = SLIDING_VIEW_INIT(f); move_window(&window, 3, 7); /* (1) / move_window(&window, 5, 5); / (2) / move_window(&window, 12, 2); / (3) */ strbuf_release(&window.buf); buffer_deinit(f); The data structure is called sliding_view instead of _window to prevent confusion with svndiff0 Windows. In this example, (1) reads 10 bytes and discards the first 3; (2) discards the first 2, which are not needed any more; and (3) skips 2 bytes and reads 2 new bytes to work with. When move_window returns, the file position indicator is at position window->off + window->width and the data from positions window->off to the current file position are stored in window->buf. This function performs only sequential access from the input file and never seeks, so it can be safely used on pipes and sockets. On end-of-file, move_window silently reads less than the caller requested. On other errors, it prints a message and returns -1. Helped-by: David Barr <david.barr@cordelta.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>		14 years ago
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LICENSE	vcs-svn: learn to maintain a sliding view of a file	14 years ago
fast_export.c	vcs-svn: add missing cast to printf argument	14 years ago
fast_export.h	vcs-svn: handle log message with embedded NUL	14 years ago
line_buffer.c	vcs-svn: remove buffer_read_string	14 years ago
line_buffer.h	vcs-svn: remove buffer_read_string	14 years ago
line_buffer.txt	vcs-svn: remove buffer_read_string	14 years ago
obj_pool.h	…
repo_tree.c	vcs-svn: handle log message with embedded NUL	14 years ago
repo_tree.h	vcs-svn: handle log message with embedded NUL	14 years ago
sliding_window.c	vcs-svn: learn to maintain a sliding view of a file	14 years ago
sliding_window.h	vcs-svn: learn to maintain a sliding view of a file	14 years ago
string_pool.c	Add string-specific memory pool	15 years ago
string_pool.h	Add string-specific memory pool	15 years ago
string_pool.txt	Add string-specific memory pool	15 years ago
svndump.c	vcs-svn: handle log message with embedded NUL	14 years ago
svndump.h	vcs-svn: Check for errors from open()	14 years ago
trp.h	treap: make treap_insert return inserted node	14 years ago
trp.txt	treap: make treap_insert return inserted node	14 years ago