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/*= -*- c-file-style: "bsd" -*-
* rproxy -- dynamic caching and delta update in HTTP
* $Id: protocol.h,v 1.1 2000/08/06 12:48:38 mbp Exp $
*
* Copyright (C) 1999, 2000 by Martin Pool <mbp@humbug.org.au>
* Copyright (C) 1999 by Andrew Tridgell
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* TODO: Have a way to copy from the old signature into the new
* one. This will be useful for the case where the files are in fact
* identical, which will be significantly common.
*/
/*
| "The IETF already has more than enough
| RFCs that codify the obvious, make
| stupidity illegal, support truth,
| justice, and the IETF way, and generally
| demonstrate the author is a brilliant and
| valuable Contributor to The Standards
| Process."
| -- Vernon Schryver
*/
#define HS_LT_MAGIC 0x67640001 /* "gd\000\001" */
#define HS_SIG_MAGIC 0x67642001 /* "gd \001" */
/*
* Encoding opcodes.
*
* We require 6 + 3 + 3 + 1 = 13 non-inline opcodes; we'll reserve three to
* keep things simple. That means we have 240 inline opcodes, or 120 each
* for literals and signature.
*
* TODO: What about a special case for offset=0? This will be pretty common.
*
* Actually, perhaps we should release some of the hardcoded cases.
* If we're encoding a 100-byte run it doesn't hurt too much to
* explicitly give the length, but it would be good to have some space
* to add new commands in the future. If a decoder sees a command it
* doesn't recognize, it should flag an error.
*/
enum {
op_eof = 0,
op_literal_1 = 0x01,
op_literal_last = 0x78,
op_literal_byte = 0x79,
op_literal_short = 0x7a,
op_literal_int = 0x7b,
op_signature_1 = 0x7c,
op_signature_last = 0xf2,
op_signature_byte = 0xf3,
op_signature_short = 0xf4,
op_signature_int = 0xf5,
op_checksum_short = 0xf6,
op_copy_short_byte = 0xf7,
op_copy_short_short = 0xf8,
op_copy_short_int = 0xf9,
op_copy_int_byte = 0xfa,
op_copy_int_short = 0xfb,
op_copy_int_int = 0xfc,
op_copy_llong_byte = 0xfd,
op_copy_llong_short = 0xfe,
op_copy_llong_int = 0xff
};
/*
* Declarations for a table describing how to encode and decode these
* commands. The actual table is in prototab.c.
*/
|
