sl@0: /* crypto/evp/encode.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0:  /*
sl@0:  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.
sl@0:  */
sl@0: 
sl@0: 
sl@0: #include <stdio.h>
sl@0: #include "cryptlib.h"
sl@0: #include <openssl/evp.h>
sl@0: #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))
sl@0: #include "libcrypto_wsd_macros.h"
sl@0: #include "libcrypto_wsd.h"
sl@0: #endif
sl@0: 
sl@0: #ifndef CHARSET_EBCDIC
sl@0: #define conv_bin2ascii(a)	(data_bin2ascii[(a)&0x3f])
sl@0: #define conv_ascii2bin(a)	(data_ascii2bin[(a)&0x7f])
sl@0: #else
sl@0: /* We assume that PEM encoded files are EBCDIC files
sl@0:  * (i.e., printable text files). Convert them here while decoding.
sl@0:  * When encoding, output is EBCDIC (text) format again.
sl@0:  * (No need for conversion in the conv_bin2ascii macro, as the
sl@0:  * underlying textstring data_bin2ascii[] is already EBCDIC)
sl@0:  */
sl@0: #define conv_bin2ascii(a)	(data_bin2ascii[(a)&0x3f])
sl@0: #define conv_ascii2bin(a)	(data_ascii2bin[os_toascii[a]&0x7f])
sl@0: #endif
sl@0: 
sl@0: /* 64 char lines
sl@0:  * pad input with 0
sl@0:  * left over chars are set to =
sl@0:  * 1 byte  => xx==
sl@0:  * 2 bytes => xxx=
sl@0:  * 3 bytes => xxxx
sl@0:  */
sl@0: #define BIN_PER_LINE    (64/4*3)
sl@0: #define CHUNKS_PER_LINE (64/4)
sl@0: #define CHAR_PER_LINE   (64+1)
sl@0: 
sl@0: #ifndef EMULATOR
sl@0: static unsigned char data_bin2ascii[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZ\
sl@0: abcdefghijklmnopqrstuvwxyz0123456789+/";
sl@0: #else
sl@0: static const unsigned char data_bin2ascii[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZ\
sl@0: abcdefghijklmnopqrstuvwxyz0123456789+/";
sl@0: #endif
sl@0: 
sl@0: /* 0xF0 is a EOLN
sl@0:  * 0xF1 is ignore but next needs to be 0xF0 (for \r\n processing).
sl@0:  * 0xF2 is EOF
sl@0:  * 0xE0 is ignore at start of line.
sl@0:  * 0xFF is error
sl@0:  */
sl@0: 
sl@0: #define B64_EOLN		0xF0
sl@0: #define B64_CR			0xF1
sl@0: #define B64_EOF			0xF2
sl@0: #define B64_WS			0xE0
sl@0: #define B64_ERROR       	0xFF
sl@0: #define B64_NOT_BASE64(a)	(((a)|0x13) == 0xF3)
sl@0: 
sl@0: #ifndef EMULATOR
sl@0: static unsigned char data_ascii2bin[128]={
sl@0: 	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0xE0,0xF0,0xFF,0xFF,0xF1,0xFF,0xFF,
sl@0: 	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xE0,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0xFF,0xFF,0x3E,0xFF,0xF2,0xFF,0x3F,
sl@0: 	0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,
sl@0: 	0x3C,0x3D,0xFF,0xFF,0xFF,0x00,0xFF,0xFF,
sl@0: 	0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06,
sl@0: 	0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,
sl@0: 	0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16,
sl@0: 	0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20,
sl@0: 	0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,
sl@0: 	0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,0x30,
sl@0: 	0x31,0x32,0x33,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	};
sl@0: 
sl@0: #else
sl@0: static const unsigned char data_ascii2bin[128]={
sl@0: 	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0xE0,0xF0,0xFF,0xFF,0xF1,0xFF,0xFF,
sl@0: 	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xE0,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0xFF,0xFF,0x3E,0xFF,0xF2,0xFF,0x3F,
sl@0: 	0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,
sl@0: 	0x3C,0x3D,0xFF,0xFF,0xFF,0x00,0xFF,0xFF,
sl@0: 	0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06,
sl@0: 	0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,
sl@0: 	0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16,
sl@0: 	0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20,
sl@0: 	0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,
sl@0: 	0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,0x30,
sl@0: 	0x31,0x32,0x33,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	};
sl@0: #endif	
sl@0: 
sl@0: EXPORT_C void EVP_EncodeInit(EVP_ENCODE_CTX *ctx)
sl@0: 	{
sl@0: 	ctx->length=48;
sl@0: 	ctx->num=0;
sl@0: 	ctx->line_num=0;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
sl@0: 	     const unsigned char *in, int inl)
sl@0: 	{
sl@0: 	int i,j;
sl@0: 	unsigned int total=0;
sl@0: 
sl@0: 	*outl=0;
sl@0: 	if (inl == 0) return;
sl@0: 	OPENSSL_assert(ctx->length <= (int)sizeof(ctx->enc_data));
sl@0: 	if ((ctx->num+inl) < ctx->length)
sl@0: 		{
sl@0: 		memcpy(&(ctx->enc_data[ctx->num]),in,inl);
sl@0: 		ctx->num+=inl;
sl@0: 		return;
sl@0: 		}
sl@0: 	if (ctx->num != 0)
sl@0: 		{
sl@0: 		i=ctx->length-ctx->num;
sl@0: 		memcpy(&(ctx->enc_data[ctx->num]),in,i);
sl@0: 		in+=i;
sl@0: 		inl-=i;
sl@0: 		j=EVP_EncodeBlock(out,ctx->enc_data,ctx->length);
sl@0: 		ctx->num=0;
sl@0: 		out+=j;
sl@0: 		*(out++)='\n';
sl@0: 		*out='\0';
sl@0: 		total=j+1;
sl@0: 		}
sl@0: 	while (inl >= ctx->length)
sl@0: 		{
sl@0: 		j=EVP_EncodeBlock(out,in,ctx->length);
sl@0: 		in+=ctx->length;
sl@0: 		inl-=ctx->length;
sl@0: 		out+=j;
sl@0: 		*(out++)='\n';
sl@0: 		*out='\0';
sl@0: 		total+=j+1;
sl@0: 		}
sl@0: 	if (inl != 0)
sl@0: 		memcpy(&(ctx->enc_data[0]),in,inl);
sl@0: 	ctx->num=inl;
sl@0: 	*outl=total;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
sl@0: 	{
sl@0: 	unsigned int ret=0;
sl@0: 
sl@0: 	if (ctx->num != 0)
sl@0: 		{
sl@0: 		ret=EVP_EncodeBlock(out,ctx->enc_data,ctx->num);
sl@0: 		out[ret++]='\n';
sl@0: 		out[ret]='\0';
sl@0: 		ctx->num=0;
sl@0: 		}
sl@0: 	*outl=ret;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_EncodeBlock(unsigned char *t, const unsigned char *f, int dlen)
sl@0: 	{
sl@0: 	int i,ret=0;
sl@0: 	unsigned long l;
sl@0: 
sl@0: 	for (i=dlen; i > 0; i-=3)
sl@0: 		{
sl@0: 		if (i >= 3)
sl@0: 			{
sl@0: 			l=	(((unsigned long)f[0])<<16L)|
sl@0: 				(((unsigned long)f[1])<< 8L)|f[2];
sl@0: 			*(t++)=conv_bin2ascii(l>>18L);
sl@0: 			*(t++)=conv_bin2ascii(l>>12L);
sl@0: 			*(t++)=conv_bin2ascii(l>> 6L);
sl@0: 			*(t++)=conv_bin2ascii(l     );
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			l=((unsigned long)f[0])<<16L;
sl@0: 			if (i == 2) l|=((unsigned long)f[1]<<8L);
sl@0: 
sl@0: 			*(t++)=conv_bin2ascii(l>>18L);
sl@0: 			*(t++)=conv_bin2ascii(l>>12L);
sl@0: 			*(t++)=(i == 1)?'=':conv_bin2ascii(l>> 6L);
sl@0: 			*(t++)='=';
sl@0: 			}
sl@0: 		ret+=4;
sl@0: 		f+=3;
sl@0: 		}
sl@0: 
sl@0: 	*t='\0';
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void EVP_DecodeInit(EVP_ENCODE_CTX *ctx)
sl@0: 	{
sl@0: 	ctx->length=30;
sl@0: 	ctx->num=0;
sl@0: 	ctx->line_num=0;
sl@0: 	ctx->expect_nl=0;
sl@0: 	}
sl@0: 
sl@0: /* -1 for error
sl@0:  *  0 for last line
sl@0:  *  1 for full line
sl@0:  */
sl@0: EXPORT_C int EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
sl@0: 	     const unsigned char *in, int inl)
sl@0: 	{
sl@0: 	int seof= -1,eof=0,rv= -1,ret=0,i,v,tmp,n,ln,tmp2,exp_nl;
sl@0: 	unsigned char *d;
sl@0: 
sl@0: 	n=ctx->num;
sl@0: 	d=ctx->enc_data;
sl@0: 	ln=ctx->line_num;
sl@0: 	exp_nl=ctx->expect_nl;
sl@0: 
sl@0: 	/* last line of input. */
sl@0: 	if ((inl == 0) || ((n == 0) && (conv_ascii2bin(in[0]) == B64_EOF)))
sl@0: 		{ rv=0; goto end; }
sl@0: 		
sl@0: 	/* We parse the input data */
sl@0: 	for (i=0; i<inl; i++)
sl@0: 		{
sl@0: 		/* If the current line is > 80 characters, scream alot */
sl@0: 		if (ln >= 80) { rv= -1; goto end; }
sl@0: 
sl@0: 		/* Get char and put it into the buffer */
sl@0: 		tmp= *(in++);
sl@0: 		v=conv_ascii2bin(tmp);
sl@0: 		/* only save the good data :-) */
sl@0: 		if (!B64_NOT_BASE64(v))
sl@0: 			{
sl@0: 			OPENSSL_assert(n < (int)sizeof(ctx->enc_data));
sl@0: 			d[n++]=tmp;
sl@0: 			ln++;
sl@0: 			}
sl@0: 		else if (v == B64_ERROR)
sl@0: 			{
sl@0: 			rv= -1;
sl@0: 			goto end;
sl@0: 			}
sl@0: 
sl@0: 		/* have we seen a '=' which is 'definitly' the last
sl@0: 		 * input line.  seof will point to the character that
sl@0: 		 * holds it. and eof will hold how many characters to
sl@0: 		 * chop off. */
sl@0: 		if (tmp == '=')
sl@0: 			{
sl@0: 			if (seof == -1) seof=n;
sl@0: 			eof++;
sl@0: 			}
sl@0: 
sl@0: 		if (v == B64_CR)
sl@0: 			{
sl@0: 			ln = 0;
sl@0: 			if (exp_nl)
sl@0: 				continue;
sl@0: 			}
sl@0: 
sl@0: 		/* eoln */
sl@0: 		if (v == B64_EOLN)
sl@0: 			{
sl@0: 			ln=0;
sl@0: 			if (exp_nl)
sl@0: 				{
sl@0: 				exp_nl=0;
sl@0: 				continue;
sl@0: 				}
sl@0: 			}
sl@0: 		exp_nl=0;
sl@0: 
sl@0: 		/* If we are at the end of input and it looks like a
sl@0: 		 * line, process it. */
sl@0: 		if (((i+1) == inl) && (((n&3) == 0) || eof))
sl@0: 			{
sl@0: 			v=B64_EOF;
sl@0: 			/* In case things were given us in really small
sl@0: 			   records (so two '=' were given in separate
sl@0: 			   updates), eof may contain the incorrect number
sl@0: 			   of ending bytes to skip, so let's redo the count */
sl@0: 			eof = 0;
sl@0: 			if (d[n-1] == '=') eof++;
sl@0: 			if (d[n-2] == '=') eof++;
sl@0: 			/* There will never be more than two '=' */
sl@0: 			}
sl@0: 
sl@0: 		if ((v == B64_EOF && (n&3) == 0) || (n >= 64))
sl@0: 			{
sl@0: 			/* This is needed to work correctly on 64 byte input
sl@0: 			 * lines.  We process the line and then need to
sl@0: 			 * accept the '\n' */
sl@0: 			if ((v != B64_EOF) && (n >= 64)) exp_nl=1;
sl@0: 			tmp2=v;
sl@0: 			if (n > 0)
sl@0: 				{
sl@0: 				v=EVP_DecodeBlock(out,d,n);
sl@0: 				n=0;
sl@0: 				if (v < 0) { rv=0; goto end; }
sl@0: 				ret+=(v-eof);
sl@0: 				}
sl@0: 			else
sl@0: 				{
sl@0: 				eof=1;
sl@0: 				v=0;
sl@0: 				}
sl@0: 
sl@0: 			/* This is the case where we have had a short
sl@0: 			 * but valid input line */
sl@0: 			if ((v < ctx->length) && eof)
sl@0: 				{
sl@0: 				rv=0;
sl@0: 				goto end;
sl@0: 				}
sl@0: 			else
sl@0: 				ctx->length=v;
sl@0: 
sl@0: 			if (seof >= 0) { rv=0; goto end; }
sl@0: 			out+=v;
sl@0: 			}
sl@0: 		}
sl@0: 	rv=1;
sl@0: end:
sl@0: 	*outl=ret;
sl@0: 	ctx->num=n;
sl@0: 	ctx->line_num=ln;
sl@0: 	ctx->expect_nl=exp_nl;
sl@0: 	return(rv);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_DecodeBlock(unsigned char *t, const unsigned char *f, int n)
sl@0: 	{
sl@0: 	int i,ret=0,a,b,c,d;
sl@0: 	unsigned long l;
sl@0: 
sl@0: 	/* trim white space from the start of the line. */
sl@0: 	while ((conv_ascii2bin(*f) == B64_WS) && (n > 0))
sl@0: 		{
sl@0: 		f++;
sl@0: 		n--;
sl@0: 		}
sl@0: 
sl@0: 	/* strip off stuff at the end of the line
sl@0: 	 * ascii2bin values B64_WS, B64_EOLN, B64_EOLN and B64_EOF */
sl@0: 	while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n-1]))))
sl@0: 		n--;
sl@0: 
sl@0: 	if (n%4 != 0) return(-1);
sl@0: 
sl@0: 	for (i=0; i<n; i+=4)
sl@0: 		{
sl@0: 		a=conv_ascii2bin(*(f++));
sl@0: 		b=conv_ascii2bin(*(f++));
sl@0: 		c=conv_ascii2bin(*(f++));
sl@0: 		d=conv_ascii2bin(*(f++));
sl@0: 		if (	(a & 0x80) || (b & 0x80) ||
sl@0: 			(c & 0x80) || (d & 0x80))
sl@0: 			return(-1);
sl@0: 		l=(	(((unsigned long)a)<<18L)|
sl@0: 			(((unsigned long)b)<<12L)|
sl@0: 			(((unsigned long)c)<< 6L)|
sl@0: 			(((unsigned long)d)     ));
sl@0: 		*(t++)=(unsigned char)(l>>16L)&0xff;
sl@0: 		*(t++)=(unsigned char)(l>> 8L)&0xff;
sl@0: 		*(t++)=(unsigned char)(l     )&0xff;
sl@0: 		ret+=3;
sl@0: 		}
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
sl@0: 	{
sl@0: 	int i;
sl@0: 
sl@0: 	*outl=0;
sl@0: 	if (ctx->num != 0)
sl@0: 		{
sl@0: 		i=EVP_DecodeBlock(out,ctx->enc_data,ctx->num);
sl@0: 		if (i < 0) return(-1);
sl@0: 		ctx->num=0;
sl@0: 		*outl=i;
sl@0: 		return(1);
sl@0: 		}
sl@0: 	else
sl@0: 		return(1);
sl@0: 	}
sl@0: 
sl@0: #ifdef undef
sl@0: EXPORT_C int EVP_DecodeValid(unsigned char *buf, int len)
sl@0: 	{
sl@0: 	int i,num=0,bad=0;
sl@0: 
sl@0: 	if (len == 0) return(-1);
sl@0: 	while (conv_ascii2bin(*buf) == B64_WS)
sl@0: 		{
sl@0: 		buf++;
sl@0: 		len--;
sl@0: 		if (len == 0) return(-1);
sl@0: 		}
sl@0: 
sl@0: 	for (i=len; i >= 4; i-=4)
sl@0: 		{
sl@0: 		if (	(conv_ascii2bin(buf[0]) >= 0x40) ||
sl@0: 			(conv_ascii2bin(buf[1]) >= 0x40) ||
sl@0: 			(conv_ascii2bin(buf[2]) >= 0x40) ||
sl@0: 			(conv_ascii2bin(buf[3]) >= 0x40))
sl@0: 			return(-1);
sl@0: 		buf+=4;
sl@0: 		num+=1+(buf[2] != '=')+(buf[3] != '=');
sl@0: 		}
sl@0: 	if ((i == 1) && (conv_ascii2bin(buf[0]) == B64_EOLN))
sl@0: 		return(num);
sl@0: 	if ((i == 2) && (conv_ascii2bin(buf[0]) == B64_EOLN) &&
sl@0: 		(conv_ascii2bin(buf[0]) == B64_EOLN))
sl@0: 		return(num);
sl@0: 	return(1);
sl@0: 	}
sl@0: #endif