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/** @file length.cc
* @brief length encoded as a string
*/
/* Copyright (C) 2006,2007,2008,2009,2010,2011,2012,2015 Olly Betts
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include "length.h"
#include "noreturn.h"
XAPIAN_NORETURN(static void throw_network_error(const char * msg));
#ifndef XAPIAN_UNITTEST
#include "xapian/error.h"
static void
throw_network_error(const char * msg)
{
throw Xapian::NetworkError(msg);
}
#else
class Xapian_NetworkError {
const char * msg;
public:
explicit Xapian_NetworkError(const char * msg_) : msg(msg_) { }
const char * get_description() const { return msg; }
};
static void
throw_network_error(const char * msg)
{
throw Xapian_NetworkError(msg);
}
#endif
template<typename T>
static inline void
decode_length_(const char ** p, const char *end, T & out)
{
if (*p == end) {
throw_network_error("Bad encoded length: no data");
}
T len = static_cast<unsigned char>(*(*p)++);
if (len == 0xff) {
len = 0;
unsigned char ch;
unsigned shift = 0;
do {
if (*p == end || shift > (sizeof(T) * 8 / 7 * 7))
throw_network_error("Bad encoded length: insufficient data");
ch = *(*p)++;
len |= T(ch & 0x7f) << shift;
shift += 7;
} while ((ch & 0x80) == 0);
len += 255;
}
out = len;
}
template<typename T>
static inline void
decode_length_and_check_(const char ** p, const char *end, T & out)
{
decode_length(p, end, out);
if (out > T(end - *p)) {
throw_network_error("Bad encoded length: length greater than data");
}
}
void
decode_length(const char ** p, const char *end, unsigned & out)
{
decode_length_(p, end, out);
}
void
decode_length(const char ** p, const char *end, unsigned long & out)
{
decode_length_(p, end, out);
}
void
decode_length(const char ** p, const char *end, unsigned long long & out)
{
decode_length_(p, end, out);
}
void
decode_length_and_check(const char ** p, const char *end, unsigned & out)
{
decode_length_and_check_(p, end, out);
}
void
decode_length_and_check(const char ** p, const char *end, unsigned long & out)
{
decode_length_and_check_(p, end, out);
}
void
decode_length_and_check(const char ** p, const char *end,
unsigned long long & out)
{
decode_length_and_check_(p, end, out);
}
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