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/*
* Off-the-Record Messaging library
* Copyright (C) 2004-2012 Ian Goldberg, Rob Smits, Chris Alexander,
* Willy Lew, Lisa Du, Nikita Borisov
* <otr@cypherpunks.ca>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of version 2.1 of the GNU Lesser General
* Public License as published by the Free Software Foundation.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __SERIAL_H__
#define __SERIAL_H__
#undef DEBUG
#ifdef DEBUG
#include <stdio.h>
#define debug_data(t,b,l) do { const unsigned char *data = (b); size_t i; \
fprintf(stderr, "%s: ", (t)); \
for(i=0;i<(l);++i) { \
fprintf(stderr, "%02x", data[i]); \
} \
fprintf(stderr, "\n"); \
} while(0)
#define debug_int(t,b) do { const unsigned char *data = (b); \
unsigned int v = \
(((unsigned int)data[0]) << 24) | (data[1] << 16) | (data[2] << 8) | data[3]; \
fprintf(stderr, "%s: %u (0x%x)\n", (t), v, v); \
} while(0)
#else
#define debug_data(t,b,l)
#define debug_int(t,b)
#endif
#define write_int(x) do { \
bufp[0] = ((x) >> 24) & 0xff; \
bufp[1] = ((x) >> 16) & 0xff; \
bufp[2] = ((x) >> 8) & 0xff; \
bufp[3] = (x) & 0xff; \
bufp += 4; lenp -= 4; \
} while(0)
#define write_mpi(x,nx,dx) do { \
write_int(nx); \
gcry_mpi_print(format, bufp, lenp, NULL, (x)); \
debug_data((dx), bufp, (nx)); \
bufp += (nx); lenp -= (nx); \
} while(0)
#define require_len(l) do { \
if (lenp < (l)) goto invval; \
} while(0)
#define read_int(x) do { \
require_len(4); \
(x) = (((unsigned int)bufp[0]) << 24) | (bufp[1] << 16) | (bufp[2] << 8) | bufp[3]; \
bufp += 4; lenp -= 4; \
} while(0)
#define read_mpi(x) do { \
size_t mpilen; \
read_int(mpilen); \
if (mpilen) { \
require_len(mpilen); \
gcry_mpi_scan(&(x), GCRYMPI_FMT_USG, bufp, mpilen, NULL); \
} else { \
(x) = gcry_mpi_set_ui(NULL, 0); \
} \
bufp += mpilen; lenp -= mpilen; \
} while(0)
/* Write version and msg type into bufp*/
#define write_header(version, msgtype) do { \
bufp[0] = 0x00; \
bufp[1] = version & 0xff; \
bufp[2] = msgtype; \
debug_data("Header", bufp, 3); \
bufp += 3; lenp -= 3; \
} while(0)
/* Verify msg header is v1, v2 or v3 and has type x,
* increment bufp past msg header */
#define skip_header(x) do { \
require_len(3); \
if ((bufp[0] != 0x00) || (bufp[2] != x)) \
goto invval; \
if ((bufp[1] == 0x01) || (bufp[1] == 0x02) || \
(bufp[1] == 0x03)) { \
bufp += 3; lenp -= 3; \
} else goto invval; \
} while(0)
#endif