/*********************************************************************

					IOS - reply chain
					
	Program : IOSmail
    Source  : free
	Author  : Rinaldo Visscher
	Date    : 1991
	
**********************************************************************/

#include	<stdio.h>
#include	<stdlib.h>
#include	<ext.h>

#include	"portab.h"
#include	"defs.h"
#include	"ioslib.h"

#include	"strutil.h"
#include	"crc.h"
#include	"lang.h"

MLOCAL ULONG crc32tab[] = {		/*	CRC-32 polynom 0xedb88320	*/
0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, 0x706af48fL, 0xe963a535L, 0x9e6495a3L,
0x0edb8832L, 0x79dcb8a4L, 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, 0x90bf1d91L,
0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L,
0x136c9856L, 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, 0xfa0f3d63L, 0x8d080df5L,
0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L,
0x26d930acL, 0x51de003aL, 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, 0xb8bda50fL,
0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL,
0x76dc4190L, 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, 0x9fbfe4a5L, 0xe8b8d433L,
0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L,
0x65b0d9c6L, 0x12b7e950L, 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, 0xfbd44c65L,
0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL,
0x4369e96aL, 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, 0xaa0a4c5fL, 0xdd0d7cc9L,
0x5005713cL, 0x270241aaL, 0xbe0b1010L, 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL,
0xedb88320L, 0x9abfb3b6L, 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, 0x73dc1683L,
0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L,
0xf00f9344L, 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, 0x196c3671L, 0x6e6b06e7L,
0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL,
0xd80d2bdaL, 0xaf0a1b4cL, 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, 0x4669be79L,
0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL,
0xc5ba3bbeL, 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, 0x2cd99e8bL, 0x5bdeae1dL,
0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L,
0x86d3d2d4L, 0xf1d4e242L, 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, 0x18b74777L,
0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L,
0xa00ae278L, 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, 0x4969474dL, 0x3e6e77dbL,
0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, 0xcdd70693L, 0x54de5729L, 0x23d967bfL,
0xb3667a2eL, 0xc4614ab8L, 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, 0x2d02ef8dL
};

MLOCAL ULONG *dupetrap;
MLOCAL UWORD *dupearea;
MLOCAL LONG	 dupes = 0L;
MLOCAL LONG	 Mdupes= 1000L;
MLOCAL BOOLEAN can_do_it = FALSE;
MLOCAL FILE *DUPELOG;

extern BOOLEAN doNOdupecheck;
extern BOOLEAN debugflag;
extern LONG		DupeLog;
extern BYTE		*Logmessage[LAST_MESSAGE];

#define	updcrc(octet, crc) (crc32tab[((crc)^(octet)) & 0xff] ^ ((crc) >> 8))
#define MAX_CRC	100

MLOCAL ULONG crc32str(BYTE *s)
{
	REG ULONG	oldcrc32 = 0xFFFFFFFFL,
				oldcrc;
	
	while (*s != EOS)
	{
		oldcrc32 = updcrc((WORD) *s, oldcrc32);
		s++;
	}
	
	oldcrc = oldcrc32 = ~oldcrc32;
	
	return(oldcrc);
}

ULONG get_crc(BYTE *msgbody, BYTE *keyword)
{
	/*
	**	Searches KEYWORD in msgbody and calculates CRC32 from the
	**	Rest of the line (in this case, nodenumber and id with no
	**	trailing blanks)
	*/
	
	BYTE	*q, *p,
			crc_string[MAX_CRC],
			i=0;
	
	if ((p = strline(msgbody, keyword)) != NULL)
	{
		p = skip_to_token(p, ':');
		p = skip_blanks(p);

/*		
		for (q = crc_string; *p && *p != '\n', i <  MAX_CRC; *q++ = *p++, i++);
*/
		
		q = crc_string;
		
		while (*p != '\n') {
			if (i == MAX_CRC) break;
			*q++ = *p++;
			i++;
		}
		
		/*
		**	Remove possible spaces from the end
		*/
		
		while (*--q == ' ');
		*++q = EOS;
		
		return(crc32str(crc_string));
	}     
	else return(NULL);
}

VOID reply_chain(BYTE *msgtext, MSGHEADER *msghdr, BYTE whichfields)
{
	/*
	**	Sets CRC32 value of ^AMSGID and ^AREPLY to up,parent
	**	read, costs if whichfields = UPCOST or mailer[0-3] if
	**	whichfields = MAILER_FIELD
	*/
	
	ULONG	msgid_crc,
			reply_crc;
	
	msgid_crc = get_crc(msgtext, "\01MSGID:");
	reply_crc = get_crc(msgtext, "\01REPLY:");
	
	if (whichfields == MAILER_FIELD)
	{
		msghdr->mailer[0] = (UWORD)(msgid_crc >> 16);
		msghdr->mailer[1] = (UWORD)(msgid_crc & 0xFFFFUL);
		msghdr->mailer[2] = (UWORD)(reply_crc >> 16);
		msghdr->mailer[3] = (UWORD)(reply_crc & 0xFFFFUL);
	}
	else
	{ 
/*
		msghdr->mid = msgid_crc;
		msghdr->rep = reply_crc;
*/		
		  
		msghdr->up		= (UWORD)(msgid_crc >> 16);
		msghdr->parent	= (UWORD)(msgid_crc & 0xFFFFUL);
		msghdr->reads	= (UWORD)(reply_crc >> 16);
		msghdr->cost	= (UWORD)(reply_crc & 0xFFFFUL);
	}
}

VOID inst_dupetrap(VOID) {

	LONG i;
	struct ffblk blk;
	
	if (doNOdupecheck == TRUE) return;
	
	DUPELOG = NULL;
	
	if (DupeLog) {
		if (!findfirst(DUPESFILE, &blk, 0)) {
			if ((DUPELOG = fopen(DUPESFILE, "rb")) != NULL) {
				fread(&Mdupes, sizeof (ULONG), 1, DUPELOG);
				Mdupes += 1000;
			}
		}
	}
	
	dupetrap = (ULONG *)malloc(Mdupes * sizeof(ULONG));

	if (dupetrap) {
		if ((dupearea = (UWORD *)malloc(Mdupes * sizeof(UWORD))) != NULL)
			can_do_it = TRUE;
		else free (dupetrap);
	}
	
	if (DupeLog) {
		if (DUPELOG != NULL) {
			log_line(2, Logmessage[M__READING_DUPES]);
			dupes = Mdupes - 1000;
			for (i = 0; i <= dupes ; i++) {
				if (feof (DUPELOG)) break;
				fread (&dupearea[i], sizeof (UWORD), 1, DUPELOG);
				fread (&dupetrap[i], sizeof (LONG) , 1, DUPELOG);
			}
			fclose(DUPELOG);
		}
	}
}

VOID free_dupetrap(VOID) {
	LONG i, start;
	
	if (doNOdupecheck == TRUE) return;
	
	if (can_do_it == TRUE) {
		if (DupeLog) {
			if (dupes > DupeLog) {
				start = dupes - DupeLog;
			} else {
				start = 0;
			}
			
			if ((DUPELOG = fopen (DUPESFILE, "wb")) != NULL) {
				
				log_line(2, Logmessage[M__WRITING_DUPES]);
				
				fwrite (&dupes, sizeof (ULONG), 1, DUPELOG);
				
				for (i = start; i < dupes ; i++) {
					fwrite (&dupearea[i], sizeof (UWORD), 1, DUPELOG);
					fwrite (&dupetrap[i], sizeof (LONG) , 1, DUPELOG);
				}
				fclose (DUPELOG);
			}
		}
		
		free (dupetrap);
		free (dupearea);
	}
}

BOOLEAN get_dupes(BYTE *msgtext, WORD area) {
	REG LONG i;
	ULONG msgid_crc;
	
	if (can_do_it == FALSE) return (FALSE);
	
	msgid_crc = get_crc(msgtext, "\01MSGID:");
	
	if (!msgid_crc)	return (FALSE);
	
	for (i=0; i < dupes; i++) {
		if (dupetrap[i] == msgid_crc && dupearea[i] == area) 
			return (TRUE);
	}
	
	dupearea[dupes]   = area;
	dupetrap[dupes++] = msgid_crc;
	
	if (dupes >= Mdupes) {
#if defined EXTERNDEBUG
		if (debugflag)
			log_line(6,">Install memory for dupetrap %ld", Mdupes+1000L);
#endif
		Mdupes += 1000;
		if ((dupetrap = (ULONG *)realloc(dupetrap, Mdupes * sizeof(ULONG))) == NULL) {
			can_do_it = FALSE;
			free(dupearea);
		} else {
			if ((dupearea = (UWORD *)realloc(dupearea, Mdupes * sizeof(UWORD))) == NULL) {
				can_do_it = FALSE;
				free(dupetrap);
			}
		}
	}
	
	return (FALSE);
}