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/* -*- c-file-style: "bsd" -*-
* rproxy -- dynamic caching and delta update in HTTP
* $Id: oldinhale.c,v 1.2 2000/08/07 01:47:04 mbp Exp $
*
* Copyright (C) 2000 by Martin Pool <mbp@humbug.org.au>
*
* 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 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.
*/
/*
XXX
XXX
XXX
XXX THIS FILE IS GOING AWAY SOON!
XXX filebufs are deprecated in favour of mapptr, etc
XXX
XXX
XXX
*/
#include "includes.h"
#include "mapptr.h"
#include "protocol.h"
#include "command.h"
#include "inhale.h"
/* For debugging porpoises, here are some human-readable forms. */
struct hs_op_kind_name const _hs_op_kind_names[] = {
{"EOF", op_kind_eof},
{"COPY", op_kind_copy},
{"LITERAL", op_kind_literal},
{"SIGNATURE", op_kind_signature}
};
static int
_hs_is_gd_eof(uint8_t cmd)
{
return cmd == 0;
}
static int
_hs_is_gd_copy(uint8_t type, uint32_t * offset, uint32_t * length,
hs_read_fn_t read_fn, void *read_priv)
{
uint8_t tmp8;
uint16_t tmp16;
uint32_t tmp32;
if (type < op_copy_short_byte || type > op_copy_int_int)
return 0; /* nope */
/* read the first parameter, being the offset */
if (type == op_copy_short_byte
|| type == op_copy_short_short || type == op_copy_short_int) {
if (_hs_read_netshort(read_fn, read_priv, &tmp16) != sizeof tmp16)
return -1;
*offset = tmp16;
} else {
/* must be an int */
if (_hs_read_netint(read_fn, read_priv, &tmp32) != sizeof tmp32)
return -1;
*offset = tmp32;
}
/* read the second, being the length. */
if (type == op_copy_short_byte || type == op_copy_int_byte) {
if (_hs_read_netbyte(read_fn, read_priv, &tmp8) != sizeof tmp8)
return -1;
*length = tmp8;
} else if (type == op_copy_short_short || type == op_copy_int_short) {
if (_hs_read_netshort(read_fn, read_priv, &tmp16) != sizeof tmp16)
return -1;
*length = tmp16;
} else {
if (_hs_read_netint(read_fn, read_priv, &tmp32) != sizeof tmp32)
return -1;
*length = tmp32;
}
return 1;
}
static int
_hs_is_gd_literal(uint8_t cmd,
uint32_t * length, hs_read_fn_t read_fn, void *read_priv)
{
int ret = 0;
if (cmd == op_literal_int) {
ret = _hs_read_netint(read_fn, read_priv, length);
} else if (cmd == op_literal_short) {
uint16_t tmp;
ret = _hs_read_netshort(read_fn, read_priv, &tmp);
*length = tmp;
} else if (cmd == op_literal_byte) {
uint8_t tmp;
ret = _hs_read_netbyte(read_fn, read_priv, &tmp);
*length = tmp;
} else if (cmd >= op_literal_1 && cmd < op_literal_byte) {
*length = cmd - op_literal_1 + 1;
ret = 1;
}
return ret;
}
static int
_hs_is_gd_signature(uint8_t cmd,
uint32_t * length, hs_read_fn_t read_fn, void *read_priv)
{
int ret = 0;
if (cmd == op_signature_int) {
ret = _hs_read_netint(read_fn, read_priv, length);
} else if (cmd == op_signature_short) {
uint16_t tmp;
ret = _hs_read_netshort(read_fn, read_priv, &tmp);
*length = tmp;
} else if (cmd == op_signature_byte) {
uint8_t tmp;
ret = _hs_read_netbyte(read_fn, read_priv, &tmp);
*length = tmp;
} else if (cmd >= op_signature_1 && cmd < op_signature_byte) {
*length = cmd - op_signature_1 + 1;
ret = 1;
}
return ret;
}
static int
_hs_is_op_checksum(uint8_t cmd,
uint32_t * length, hs_read_fn_t read_fn, void *read_priv)
{
int ret = 0;
if (cmd == op_checksum_short) {
uint16_t tmp;
ret = _hs_read_netshort(read_fn, read_priv, &tmp);
*length = tmp;
}
return ret;
}
/*
Returns: -1 on error, 0 on hard eof, or +1 for a command. The command is
in KIND, and LEN and OFF are set if appropriate. */
int
_hs_inhale_command(hs_read_fn_t read_fn, void *read_priv,
int *kind, uint32_t * len, uint32_t * off)
{
int ret;
uint8_t type;
ret = _hs_read_loop(read_fn, read_priv, &type, 1);
if (ret > 1) {
_hs_error("long read while trying to get a one-byte command!");
return -1;
} else if (ret < 0) {
_hs_error("error while trying to read command byte");
return -1;
} else if (ret == 0) {
_hs_error("unexpected end of file while reading a command byte; "
"assuming that this was meant to be the end of the file");
*kind = op_kind_eof;
return 0;
}
if (_hs_is_gd_eof(type) > 0) {
*kind = op_kind_eof;
} else if (_hs_is_gd_literal(type, len, read_fn, read_priv) > 0) {
*kind = op_kind_literal;
} else if (_hs_is_gd_signature(type, len, read_fn, read_priv) > 0) {
*kind = op_kind_signature;
} else if (_hs_is_gd_copy(type, off, len, read_fn, read_priv) > 0) {
*kind = op_kind_copy;
} else if (_hs_is_op_checksum(type, len, read_fn, read_priv) > 0) {
*kind = op_kind_checksum;
} else {
_hs_fatal("unexpected command %#x!", type);
return -1;
}
return 1;
}
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