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lzhuf32.c
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lzhuf32.c
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/*
Copyright 2001-2015 John Wiseman G8BPQ
This file is part of LinBPQ/BPQ32.
LinBPQ/BPQ32 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 3 of the License, or
(at your option) any later version.
LinBPQ/BPQ32 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 LinBPQ/BPQ32. If not, see http://www.gnu.org/licenses
*/
// Mail and Chat Server for BPQ32 Packet Switch
//
// lzhuf Routines
#include "BPQMail.h"
/**************************************************************
lzhuf.c
written by Haruyasu Yoshizaki 1988/11/20
some minor changes 1989/04/06
comments translated by Haruhiko Okumura 1989/04/07
getbit and getbyte modified 1990/03/23 by Paul Edwards
so that they would work on machines where integers are
not necessarily 16 bits (although ANSI guarantees a
minimum of 16). This program has compiled and run with
no errors under Turbo C 2.0, Power C, and SAS/C 4.5
(running on an IBM mainframe under MVS/XA 2.2). Could
people please use YYYY/MM/DD date format so that everyone
in the world can know what format the date is in?
external storage of filesize changed 1990/04/18 by Paul Edwards to
Intel's "little endian" rather than a machine-dependant style so
that files produced on one machine with lzhuf can be decoded on
any other. "little endian" style was chosen since lzhuf
originated on PC's, and therefore they should dictate the
standard.
initialization of something predicting spaces changed 1990/04/22 by
Paul Edwards so that when the compressed file is taken somewhere
else, it will decode properly, without changing ascii spaces to
ebcdic spaces. This was done by changing the ' ' (space literal)
to 0x20 (which is the far most likely character to occur, if you
don't know what environment it will be running on.
**************************************************************/
#define int __int16
/* crctab calculated by Mark G. Mendel, Network Systems Corporation */
UCHAR *infile, *outfile, * endinfile;
short Get()
{
if (infile == endinfile)
return -1;
else
return *(infile++);
}
static unsigned short crctab[256] = {
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};
#define updcrc(cp, crc) ((crc << 8) ^ crctab[(cp & 0xff) ^ (crc >> 8)])
unsigned long textsize = 0, codesize = 0;
unsigned short crc;
int version_1;
char wterr[] = "Can't write.";
void Error(char *message)
{
printf("\n%s\n", message);
exit(EXIT_FAILURE);
}
/********** LZSS compression **********/
#define N 2048 /* buffer size */
#define F 60 /* lookahead buffer size */
#define THRESHOLD 2
#define NIL N /* leaf of tree */
unsigned char
text_buf[N + F - 1];
static int match_position, match_length,
lson[N + 1], rson[N + 257], dad[N + 1];
static int crc_fputc(unsigned short c)
{
crc = updcrc(c, crc);
*(outfile++) = (unsigned char)c;
return 0;
}
static short crc_fgetc()
{
short retour = *(infile++);
return(retour);
}
void InitTree(void) /* initialize trees */
{
int i;
for (i = N + 1; i <= N + 256; i++)
rson[i] = NIL; /* root */
for (i = 0; i < N; i++)
dad[i] = NIL; /* node */
}
static void InsertNode(int r) /* insert to tree */
{
int i, p, cmp;
unsigned char *key;
unsigned c;
cmp = 1;
key = &text_buf[r];
p = N + 1 + key[0];
rson[r] = lson[r] = NIL;
match_length = 0;
for ( ; ; ) {
if (cmp >= 0) {
if (rson[p] != NIL)
p = rson[p];
else {
rson[p] = r;
dad[r] = p;
return;
}
} else {
if (lson[p] != NIL)
p = lson[p];
else {
lson[p] = r;
dad[r] = p;
return;
}
}
for (i = 1; i < F; i++)
if ((cmp = key[i] - text_buf[p + i]) != 0)
break;
if (i > THRESHOLD) {
if (i > match_length) {
match_position = ((r - p) & (N - 1)) - 1;
if ((match_length = i) >= F)
break;
}
if (i == match_length) {
if ((c = ((r - p) & (N-1)) - 1) < (unsigned)match_position) {
match_position = c;
}
}
}
}
dad[r] = dad[p];
lson[r] = lson[p];
rson[r] = rson[p];
dad[lson[p]] = r;
dad[rson[p]] = r;
if (rson[dad[p]] == p)
rson[dad[p]] = r;
else
lson[dad[p]] = r;
dad[p] = NIL; /* remove p */
}
static void DeleteNode(int p) /* remove from tree */
{
int q;
if (dad[p] == NIL)
return; /* not registered */
if (rson[p] == NIL)
q = lson[p];
else
if (lson[p] == NIL)
q = rson[p];
else {
q = lson[p];
if (rson[q] != NIL) {
do {
q = rson[q];
} while (rson[q] != NIL);
rson[dad[q]] = lson[q];
dad[lson[q]] = dad[q];
lson[q] = lson[p];
dad[lson[p]] = q;
}
rson[q] = rson[p];
dad[rson[p]] = q;
}
dad[q] = dad[p];
if (rson[dad[p]] == p)
rson[dad[p]] = q;
else
lson[dad[p]] = q;
dad[p] = NIL;
}
/* Huffman coding */
#define N_CHAR (256 - THRESHOLD + F)
/* kinds of characters (character code = 0..N_CHAR-1) */
#define T (N_CHAR * 2 - 1) /* size of table */
#define R (T - 1) /* position of root */
#define MAX_FREQ 0x8000 /* updates tree when the */
/* root frequency comes to this value. */
typedef unsigned char uchar;
/* table for encoding and decoding the upper 6 bits of position */
/* for encoding */
uchar p_len[64] = {
0x03, 0x04, 0x04, 0x04, 0x05, 0x05, 0x05, 0x05,
0x05, 0x05, 0x05, 0x05, 0x06, 0x06, 0x06, 0x06,
0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08
};
uchar p_code[64] = {
0x00, 0x20, 0x30, 0x40, 0x50, 0x58, 0x60, 0x68,
0x70, 0x78, 0x80, 0x88, 0x90, 0x94, 0x98, 0x9C,
0xA0, 0xA4, 0xA8, 0xAC, 0xB0, 0xB4, 0xB8, 0xBC,
0xC0, 0xC2, 0xC4, 0xC6, 0xC8, 0xCA, 0xCC, 0xCE,
0xD0, 0xD2, 0xD4, 0xD6, 0xD8, 0xDA, 0xDC, 0xDE,
0xE0, 0xE2, 0xE4, 0xE6, 0xE8, 0xEA, 0xEC, 0xEE,
0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF
};
/* for decoding */
uchar d_code[256] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09,
0x0A, 0x0A, 0x0A, 0x0A, 0x0A, 0x0A, 0x0A, 0x0A,
0x0B, 0x0B, 0x0B, 0x0B, 0x0B, 0x0B, 0x0B, 0x0B,
0x0C, 0x0C, 0x0C, 0x0C, 0x0D, 0x0D, 0x0D, 0x0D,
0x0E, 0x0E, 0x0E, 0x0E, 0x0F, 0x0F, 0x0F, 0x0F,
0x10, 0x10, 0x10, 0x10, 0x11, 0x11, 0x11, 0x11,
0x12, 0x12, 0x12, 0x12, 0x13, 0x13, 0x13, 0x13,
0x14, 0x14, 0x14, 0x14, 0x15, 0x15, 0x15, 0x15,
0x16, 0x16, 0x16, 0x16, 0x17, 0x17, 0x17, 0x17,
0x18, 0x18, 0x19, 0x19, 0x1A, 0x1A, 0x1B, 0x1B,
0x1C, 0x1C, 0x1D, 0x1D, 0x1E, 0x1E, 0x1F, 0x1F,
0x20, 0x20, 0x21, 0x21, 0x22, 0x22, 0x23, 0x23,
0x24, 0x24, 0x25, 0x25, 0x26, 0x26, 0x27, 0x27,
0x28, 0x28, 0x29, 0x29, 0x2A, 0x2A, 0x2B, 0x2B,
0x2C, 0x2C, 0x2D, 0x2D, 0x2E, 0x2E, 0x2F, 0x2F,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
};
uchar d_len[256] = {
0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
};
unsigned int freq[T + 1]; /* frequency table */
int prnt[T + N_CHAR]; /* pointers to parent nodes, except for the */
/* elements [T..T + N_CHAR - 1] which are used to get */
/* the positions of leaves corresponding to the codes. */
int son[T]; /* pointers to child nodes (son[], son[] + 1) */
unsigned int getbuf = 0;
uchar getlen = 0;
static int GetBit(void) /* get one bit */
{
unsigned int i;
while (getlen <= 8) {
if ((i = crc_fgetc()) < 0) i = 0;
getbuf |= i << (8 - getlen);
getlen += 8;
}
i = getbuf;
getbuf <<= 1;
getlen--;
return (int)((i & 0x8000) >> 15);
}
static int GetByte(void) /* get one byte */
{
unsigned int i;
while (getlen <= 8) {
if ((i = crc_fgetc()) == 0xffff) i = 0;
getbuf |= i << (8 - getlen);
getlen += 8;
}
i = getbuf;
getbuf <<= 8;
getlen -= 8;
return (int)((i & 0xff00) >> 8);
}
unsigned int putbuf = 0;
uchar putlen = 0;
static void Putcode(int l, unsigned c) /* output c bits of code */
{
putbuf |= c >> putlen;
if ((putlen += l) >= 8) {
if (crc_fputc(putbuf >> 8) == EOF) {
Error(wterr);
}
if ((putlen -= 8) >= 8) {
if (crc_fputc(putbuf) == EOF) {
Error(wterr);
}
codesize += 2;
putlen -= 8;
putbuf = c << (l - putlen);
} else {
putbuf <<= 8;
codesize++;
}
}
}
/* initialization of tree */
static void StartHuff(void)
{
int i, j;
for (i = 0; i < N_CHAR; i++) {
freq[i] = 1;
son[i] = i + T;
prnt[i + T] = i;
}
i = 0; j = N_CHAR;
while (j <= R) {
freq[j] = freq[i] + freq[i + 1];
son[j] = i;
prnt[i] = prnt[i + 1] = j;
i += 2; j++;
}
freq[T] = 0xffff;
prnt[R] = 0;
}
/* reconstruction of tree */
static void reconst(void)
{
int i, j, k;
unsigned int f, l;
/* collect leaf nodes in the first half of the table */
/* and replace the freq by (freq + 1) / 2. */
j = 0;
for (i = 0; i < T; i++) {
if (son[i] >= T) {
freq[j] = (freq[i] + 1) / 2;
son[j] = son[i];
j++;
}
}
/* begin constructing tree by connecting sons */
for (i = 0, j = N_CHAR; j < T; i += 2, j++) {
k = i + 1;
f = freq[j] = freq[i] + freq[k];
for (k = j - 1; f < freq[k]; k--);
k++;
l = (j - k) * 2;
memmove(&freq[k + 1], &freq[k], l);
freq[k] = f;
memmove(&son[k + 1], &son[k], l);
son[k] = i;
}
/* connect prnt */
for (i = 0; i < T; i++) {
if ((k = son[i]) >= T) {
prnt[k] = i;
} else {
prnt[k] = prnt[k + 1] = i;
}
}
}
/* increment frequency of given code by one, and update tree */
static void update(int c)
{
int i, j, l;
unsigned int k;
if (freq[R] == MAX_FREQ) {
reconst();
}
c = prnt[c + T];
do {
k = ++freq[c];
/* if the order is disturbed, exchange nodes */
l = c + 1;
if ((unsigned)k > freq[l])
{
while ((unsigned)k > freq[++l]);
l--;
freq[c] = freq[l];
freq[l] = k;
i = son[c];
prnt[i] = l;
if (i < T) prnt[i + 1] = l;
j = son[l];
son[l] = i;
prnt[j] = c;
if (j < T) prnt[j + 1] = c;
son[c] = j;
c = l;
}
} while ((c = prnt[c]) != 0); /* repeat up to root */
}
unsigned code, len;
static void EncodeChar(unsigned int c)
{
unsigned int i;
int j, k;
i = 0;
j = 0;
k = prnt[c + T];
/* travel from leaf to root */
do {
i >>= 1;
/* if node's address is odd-numbered, choose bigger brother node */
if (k & 1) i += 0x8000;
j++;
} while ((k = prnt[k]) != R);
Putcode(j, i);
code = i;
len = j;
update(c);
}
static void EncodePosition(unsigned int c)
{
unsigned int i;
/* output upper 6 bits by table lookup */
i = c >> 6;
Putcode(p_len[i], (unsigned)p_code[i] << 8);
/* output lower 6 bits verbatim */
Putcode(6, (c & 0x3f) << 10);
}
static void EncodeEnd(void)
{
if (putlen) {
if (crc_fputc(putbuf >> 8) == EOF) {
Error(wterr);
}
codesize++;
}
}
static int DecodeChar(void)
{
unsigned int c;
c = son[R];
/* travel from root to leaf, */
/* choosing the smaller child node (son[]) if the read bit is 0, */
/* the bigger (son[]+1} if 1 */
while (c < T) {
c += GetBit();
c = son[c];
}
c -= T;
update(c);
return (int)c;
}
static int DecodePosition(void)
{
unsigned int i, j, c;
/* recover upper 6 bits from table */
i = GetByte();
c = (unsigned)d_code[i] << 6;
j = d_len[i];
/* read lower 6 bits verbatim */
j -= 2;
while (j--) {
i = (i << 1) + GetBit();
}
return (int)(c | (i & 0x3f));
}
/* compression */
long Encode(char * in, char * out, long inlen, BOOL B1Protocol)
{
int i, c, len, r, s, last_match_length;
unsigned char *ptr;
putbuf = 0;
putlen = 0;
textsize = 0;
codesize = 0;
crc = 0;
outfile = out;
if (B1Protocol)
{
outfile+=2; // Space for CRC
}
// infile = &conn->MailBuffer[2];
textsize = inlen;
ptr = (char *)&textsize;
#ifdef __BIG_ENDIAN__
crc_fputc(*(ptr+3));
crc_fputc(*(ptr+2));
crc_fputc(*(ptr+1));
crc_fputc(*(ptr));
#else
crc_fputc(*(ptr++));
crc_fputc(*(ptr++));
crc_fputc(*(ptr++));
crc_fputc(*(ptr++));
#endif
if (textsize == 0)
return 0;
infile = in;
endinfile = infile + inlen;
textsize = 0; /* rewind and re-read */
StartHuff();
InitTree();
s = 0;
r = N - F;
for (i = s; i < r; i++)
text_buf[i] = 0x20;
for (len = 0; len < F && (c = Get()) != EOF; len++)
text_buf[r + len] = (unsigned char)c;
textsize = len;
for (i = 1; i <= F; i++)
InsertNode(r - i);
InsertNode(r);
do {
if (match_length > len)
match_length = len;
if (match_length <= THRESHOLD) {
match_length = 1;
EncodeChar(text_buf[r]);
} else {
EncodeChar(255 - THRESHOLD + match_length);
EncodePosition(match_position);
}
last_match_length = match_length;
for (i = 0; i < last_match_length &&
(c = Get()) != EOF; i++) {
DeleteNode(s);
text_buf[s] = (unsigned char)c;
if (s < F - 1)
text_buf[s + N] = (unsigned char)c;
s = (s + 1) & (N - 1);
r = (r + 1) & (N - 1);
InsertNode(r);
}
while (i++ < last_match_length) {
DeleteNode(s);
s = (s + 1) & (N - 1);
r = (r + 1) & (N - 1);
if (--len) InsertNode(r);
}
} while (len > 0);
EncodeEnd();
if (B1Protocol)
{
out[0] = crc & 0xff;
out[1]= crc >> 8;
codesize+=2;
}
codesize += 4;
Logprintf(LOG_BBS, NULL, '|', "Compressed Message Comp Len %d Msg Len %d CRC %x",
codesize, inlen, crc);
return codesize;
}
BOOL CheckifPacket(char * Via)
{
char * ptr1, * ptr2;
// Message addressed to a non-winlink address
// Need to see if real smtp, or a packet address
// No . in address assume Packet - g8bpq@g8bpq
ptr1 = strchr(Via, '.');
if (ptr1 == NULL)
return TRUE; // Packet
// Find Last Element
ptr2 = strchr(++ptr1, '.');
while (ptr2)
{
ptr1 = ptr2;
ptr2 = strchr(++ptr1, '.');
}
// ptr1 is last element. If a valid continent, it is a packet message
if (FindContinent(ptr1))
return TRUE; // Packet
if ((_stricmp(ptr1, "MARS") == 0) || (_stricmp(ptr1, "USA") == 0)) // MARS used both
return TRUE; // Packet
return FALSE;
}
void Decode(CIRCUIT * conn)
{
unsigned char *ptr;
char * StartofMsg;
short i, j, k, r;
short c;
unsigned long count;
unsigned short crc_read;
int Index = 0;
struct FBBHeaderLine * FBBHeader= &conn->FBBHeaders[0]; // The Headers from an FFB forward block
BOOL NTS = FALSE;
getbuf = 0;
getlen = 0;
textsize = 0;
codesize = 0;
infile = &conn->MailBuffer[0];
crc = 0;
if (conn->BBSFlags & FBBB1Mode)
{
short val;
long n;
crc_read = infile[0];
crc_read |= infile[1] << 8;
for (n = 2; n < conn->TempMsg->length; n++)
{
val = infile[n];
crc = updcrc(val, crc);
}
if (crc != crc_read)
{
nodeprintf(conn, "*** Message CRC Error File %x Calc %x\r", crc_read, crc);
free(conn->MailBuffer);
conn->MailBufferSize=0;
conn->MailBuffer=0;
conn->CloseAfterFlush = 20; // 2 Secs
return;
}
infile+=2;
}
textsize = 0;
ptr = (char *)&textsize;
#ifdef __BIG_ENDIAN__
ptr[3] = (unsigned char)crc_fgetc();
ptr[2] = (unsigned char)crc_fgetc();
ptr[1] = (unsigned char)crc_fgetc();
ptr[0] = (unsigned char)crc_fgetc();
#else
for (i = 0 ; i < sizeof(textsize) ; i++)
ptr[i] = (unsigned char)crc_fgetc();
#endif
// Temp fix for duff MACBPQ (Message Length send big-endian)
if (textsize > 5000000)
{
char x[4];
char y[4];
memcpy(x, &textsize, 4);
y[0] = x[3];
y[1] = x[2];
y[2] = x[1];
y[3] = x[0];
memcpy(&textsize, y, 4);
if (textsize > 5000000)
{
nodeprintf(conn, "*** Message Size Invalid %d\r", textsize);
Debugprintf("*** Message Size Invalid %d\r", textsize);
free(conn->MailBuffer);
conn->MailBufferSize=0;
conn->MailBuffer=0;
conn->CloseAfterFlush = 20; // 2 Secs
return;
}
}
Logprintf(LOG_BBS, conn, '|', "Uncompressing Message Comp Len %d Msg Len %d CRC %x",
conn->TempMsg->length, textsize, crc);
outfile = zalloc(textsize + 10000); // Lots of space for B2 header manipulations
if (textsize == 0)
return;
StartHuff();
for (i = 0; i < N - F; i++)
text_buf[i] = 0x20;
r = N - F;
for (count = 0; count < textsize; )
{
c = DecodeChar();
if (c < 256)
{
*(outfile++) = (unsigned char)c;
text_buf[r++] = (unsigned char)c;
r &= (N - 1);
count++;
}
else
{
i = (r - DecodePosition() - 1) & (N - 1);
j = c - 255 + THRESHOLD;
for (k = 0; k < j; k++)
{
c = text_buf[(i + k) & (N - 1)];
*(outfile++) = (unsigned char)c;
text_buf[r++] = (unsigned char)c;
r &= (N - 1);
count++;
}
}
}
outfile -=count;
free(conn->MailBuffer);
conn->MailBuffer = outfile;
conn->TempMsg->length = count;
if (FBBHeader->MsgType == 'P')
Index = PMSG;
else if (FBBHeader->MsgType == 'B')
Index = BMSG;
else if (FBBHeader->MsgType == 'T')
Index = TMSG;
conn->UserPointer->Total.MsgsReceived[Index]++;
conn->UserPointer->Total.BytesForwardedIn[Index] += count;
if (FBBHeader->B2Message)
{
// Parse the Message for B2 From and To info
/*
MID: A3EDD4P00P55
Date: 2009/07/25 10:08
Type: Private
From: SMTP:john.wiseman@ntlworld.com
To: G8BPQ
Subject: RE: RMS Test Messaage
Mbo: SMTP
Body: 214
File: 3556 NOLA.XLS
File: 5566 NEWBOAT.HOMEPORT.JPG
*/
UCHAR * ptr1, * ptr2, * ptr3;
__int32 linelen, MsgLen = 0;
struct MsgInfo * Msg = conn->TempMsg;
time_t Date;
char FullTo[100];
char FullFrom[100];
char ** RecpTo = NULL; // May be several Recipients
char ** HddrTo = NULL; // May be several Recipients
char ** Via = NULL; // May be several Recipients
__int32 LocalMsg[1000]; // Set if Recipient is a local wl2k address
char Type[1000]; // Message Type for each dest
__int32 B2To; // Offset to To: fields in B2 header
__int32 Recipients = 0;
__int32 RMSMsgs = 0, BBSMsgs = 0;
#ifndef LINBPQ
struct _EXCEPTION_POINTERS exinfo;
__try {
#endif
Msg->B2Flags |= B2Msg;
// Display the whole header for debugging
/*
ptr1 = strstr(outfile, "\r\n\r\n");
if (ptr1)
{
*ptr1 = 0;
Debugprintf("B2 Header = %s", outfile);
*ptr1 = '\r';
}
*/
if (_stricmp(conn->Callsign, "RMS") == 0)
Msg->B2Flags |= FromRMS;
ptr1 = outfile;
Loop:
ptr2 = strchr(ptr1, '\r');
linelen = ptr2 - ptr1;
if (_memicmp(ptr1, "From:", 5) == 0)
{
memcpy(FullFrom, ptr1, linelen);
FullFrom[linelen] = 0;
if (conn->Paclink)
{
// Messages just have the call - need to add @winlink.org
strcpy(Msg->emailfrom, "@winlink.org");
}
if (_memicmp(&ptr1[6], "smtp:", 5) == 0)
{
if (_stricmp(conn->Callsign, "RMS") == 0)
{
// Swap smtp: to rms: and save originator so we can reply via RMS
strcpy(Msg->from, "RMS:");
memcpy(Msg->emailfrom, &ptr1[11], linelen - 11);
}
else
{
strcpy(Msg->from, "SMTP:");
memcpy(Msg->emailfrom, &ptr1[11], linelen - 11);
}
}
else
{
char SaveFrom[100];
char * FromHA;
// B2 From may now contain an @BBS
strcpy(SaveFrom, FullFrom);
FromHA = strlop(SaveFrom, '@');
if (strlen(SaveFrom) > 12) SaveFrom[12] = 0;
strcpy(Msg->from, &SaveFrom[6]);
if (FromHA)
{
if (strlen(FromHA) > 39) FromHA[39] = 0;
Msg->emailfrom[0] = '@';
strcpy(&Msg->emailfrom[1], _strupr(FromHA));
}
// Remove any SSID
ptr3 = strchr(Msg->from, '-');
if (ptr3) *ptr3 = 0;