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Revision c308b9c25d54c72977d16155ae04e37f3490d5ac authored by Will Palmer on 17 April 2010, 16:55:26 UTC, committed by Junio C Hamano on 17 April 2010, 18:50:32 UTC 
documentation: clarify direction of core.autocrlf
 
The description for core.autocrlf refers to reads from / writes to
"the filesystem", the only use of this rather ambiguous term, which
technically could be referring to the git object database. (All other
mentions are part of phrases such as "..filesystems (like NFS)..").

Other sections, including the section on core.safecrlf, use the term
"work tree" for the same purpose as the term "the filesystem" is used in
the core.autocrlf section, so that seems like a good alternative, which
makes it clearer what direction the addition/removal of CR characters
occurs in.

Signed-off-by: Will Palmer <wmpalmer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
1 parent f78683f
Raw File
patch-delta.c 
/*
 * patch-delta.c:
 * recreate a buffer from a source and the delta produced by diff-delta.c
 *
 * (C) 2005 Nicolas Pitre <nico@fluxnic.net>
 *
 * This code is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include "git-compat-util.h"
#include "delta.h"

void *patch_delta(const void *src_buf, unsigned long src_size,
		  const void *delta_buf, unsigned long delta_size,
		  unsigned long *dst_size)
{
	const unsigned char *data, *top;
	unsigned char *dst_buf, *out, cmd;
	unsigned long size;

	if (delta_size < DELTA_SIZE_MIN)
		return NULL;

	data = delta_buf;
	top = (const unsigned char *) delta_buf + delta_size;

	/* make sure the orig file size matches what we expect */
	size = get_delta_hdr_size(&data, top);
	if (size != src_size)
		return NULL;

	/* now the result size */
	size = get_delta_hdr_size(&data, top);
	dst_buf = xmallocz(size);

	out = dst_buf;
	while (data < top) {
		cmd = *data++;
		if (cmd & 0x80) {
			unsigned long cp_off = 0, cp_size = 0;
			if (cmd & 0x01) cp_off = *data++;
			if (cmd & 0x02) cp_off |= (*data++ << 8);
			if (cmd & 0x04) cp_off |= (*data++ << 16);
			if (cmd & 0x08) cp_off |= ((unsigned) *data++ << 24);
			if (cmd & 0x10) cp_size = *data++;
			if (cmd & 0x20) cp_size |= (*data++ << 8);
			if (cmd & 0x40) cp_size |= (*data++ << 16);
			if (cp_size == 0) cp_size = 0x10000;
			if (cp_off + cp_size < cp_size ||
			    cp_off + cp_size > src_size ||
			    cp_size > size)
				break;
			memcpy(out, (char *) src_buf + cp_off, cp_size);
			out += cp_size;
			size -= cp_size;
		} else if (cmd) {
			if (cmd > size)
				break;
			memcpy(out, data, cmd);
			out += cmd;
			data += cmd;
			size -= cmd;
		} else {
			/*
			 * cmd == 0 is reserved for future encoding
			 * extensions. In the mean time we must fail when
			 * encountering them (might be data corruption).
			 */
			error("unexpected delta opcode 0");
			goto bad;
		}
	}

	/* sanity check */
	if (data != top || size != 0) {
		error("delta replay has gone wild");
		bad:
		free(dst_buf);
		return NULL;
	}

	*dst_size = out - dst_buf;
	return dst_buf;
}
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