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uae-wii/src/dms/pfile.c

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/*
* xDMS v1.3 - Portable DMS archive unpacker - Public Domain
* Written by Andre Rodrigues de la Rocha <adlroc@usa.net>
*
* Handles the processing of a single DMS archive
*
*/
#define HEADLEN 56
#define THLEN 20
#define TRACK_BUFFER_LEN 32000
#define TEMP_BUFFER_LEN 32000
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "sysconfig.h"
#include "sysdeps.h"
#include "zfile.h"
#include "cdata.h"
#include "u_init.h"
#include "u_rle.h"
#include "u_quick.h"
#include "u_medium.h"
#include "u_deep.h"
#include "u_heavy.h"
#include "crc_csum.h"
#include "pfile.h"
static USHORT Process_Track(struct zfile *, struct zfile *, UCHAR *, UCHAR *, USHORT, USHORT, USHORT);
static USHORT Unpack_Track(UCHAR *, UCHAR *, USHORT, USHORT, UCHAR, UCHAR);
static void printbandiz(UCHAR *, USHORT);
static void dms_decrypt(UCHAR *, USHORT);
static char modes[7][7]={"NOCOMP","SIMPLE","QUICK ","MEDIUM","DEEP ","HEAVY1","HEAVY2"};
static USHORT PWDCRC;
UCHAR *text;
USHORT DMS_Process_File(struct zfile *fi, struct zfile *fo, USHORT cmd, USHORT opt, USHORT PCRC, USHORT pwd){
USHORT from, to, geninfo, c_version, cmode, hcrc, disktype, pv, ret;
ULONG pkfsize, unpkfsize;
UCHAR *b1, *b2;
time_t date;
b1 = (UCHAR *)calloc((size_t)TRACK_BUFFER_LEN,1);
if (!b1) return ERR_NOMEMORY;
b2 = (UCHAR *)calloc((size_t)TRACK_BUFFER_LEN,1);
if (!b2) {
free(b1);
return ERR_NOMEMORY;
}
text = (UCHAR *)calloc((size_t)TEMP_BUFFER_LEN,1);
if (!text) {
free(b1);
free(b2);
return ERR_NOMEMORY;
}
/* if iname is NULL, input is stdin; if oname is NULL, output is stdout */
if (zfile_fread(b1,1,HEADLEN,fi) != HEADLEN) {
free(b1);
free(b2);
free(text);
return ERR_SREAD;
}
if ( (b1[0] != 'D') || (b1[1] != 'M') || (b1[2] != 'S') || (b1[3] != '!') ) {
/* Check the first 4 bytes of file to see if it is "DMS!" */
free(b1);
free(b2);
free(text);
return ERR_NOTDMS;
}
hcrc = (USHORT)((b1[HEADLEN-2]<<8) | b1[HEADLEN-1]);
/* Header CRC */
if (hcrc != CreateCRC(b1+4,(ULONG)(HEADLEN-6))) {
free(b1);
free(b2);
free(text);
return ERR_HCRC;
}
geninfo = (USHORT) ((b1[10]<<8) | b1[11]); /* General info about archive */
date = (time_t) ((((ULONG)b1[12])<<24) | (((ULONG)b1[13])<<16) | (((ULONG)b1[14])<<8) | (ULONG)b1[15]); /* date in standard UNIX/ANSI format */
from = (USHORT) ((b1[16]<<8) | b1[17]); /* Lowest track in archive. May be incorrect if archive is "appended" */
to = (USHORT) ((b1[18]<<8) | b1[19]); /* Highest track in archive. May be incorrect if archive is "appended" */
pkfsize = (ULONG) ((((ULONG)b1[21])<<16) | (((ULONG)b1[22])<<8) | (ULONG)b1[23]); /* Length of total packed data as in archive */
unpkfsize = (ULONG) ((((ULONG)b1[25])<<16) | (((ULONG)b1[26])<<8) | (ULONG)b1[27]); /* Length of unpacked data. Usually 901120 bytes */
c_version = (USHORT) ((b1[46]<<8) | b1[47]); /* version of DMS used to generate it */
disktype = (USHORT) ((b1[50]<<8) | b1[51]); /* Type of compressed disk */
cmode = (USHORT) ((b1[52]<<8) | b1[53]); /* Compression mode mostly used in this archive */
PWDCRC = PCRC;
if ( (cmd == CMD_VIEW) || (cmd == CMD_VIEWFULL) ) {
pv = (USHORT)(c_version/100);
write_log(" Created with DMS version %d.%02d ",pv,c_version-pv*100);
if (geninfo & 0x80)
write_log("Registered\n");
else
write_log("Evaluation\n");
write_log(" Creation date : %s",ctime(&date));
write_log(" Lowest track in archive : %d\n",from);
write_log(" Highest track in archive : %d\n",to);
write_log(" Packed data size : %lu\n",pkfsize);
write_log(" Unpacked data size : %lu\n",unpkfsize);
write_log(" Disk type of archive : ");
/* The original DMS from SDS software (DMS up to 1.11) used other values */
/* in disk type to indicate formats as MS-DOS, AMax and Mac, but it was */
/* not suported for compression. It was for future expansion and was never */
/* used. The newer versions of DMS made by ParCon Software changed it to */
/* add support for new Amiga disk types. */
switch (disktype) {
case 0:
case 1:
/* Can also be a non-dos disk */
write_log("AmigaOS 1.0 OFS\n");
break;
case 2:
write_log("AmigaOS 2.0 FFS\n");
break;
case 3:
write_log("AmigaOS 3.0 OFS / International\n");
break;
case 4:
write_log("AmigaOS 3.0 FFS / International\n");
break;
case 5:
write_log("AmigaOS 3.0 OFS / Dir Cache\n");
break;
case 6:
write_log("AmigaOS 3.0 FFS / Dir Cache\n");
break;
case 7:
write_log("FMS Amiga System File\n");
break;
default:
write_log("Unknown\n");
}
write_log(" Compression mode used : ");
if (cmode>6)
write_log("Unknown !\n");
else
write_log("%s\n",modes[cmode]);
write_log(" General info : ");
if ((geninfo==0)||(geninfo==0x80)) write_log("None");
if (geninfo & 1) write_log("NoZero ");
if (geninfo & 2) write_log("Encrypted ");
if (geninfo & 4) write_log("Appends ");
if (geninfo & 8) write_log("Banner ");
if (geninfo & 16) write_log("HD ");
if (geninfo & 32) write_log("MS-DOS ");
if (geninfo & 64) write_log("DMS_DEV_Fixed ");
if (geninfo & 256) write_log("FILEID.DIZ");
write_log("\n");
write_log(" Info Header CRC : %04X\n\n",hcrc);
}
if (disktype == 7) {
/* It's not a DMS compressed disk image, but a FMS archive */
free(b1);
free(b2);
free(text);
return ERR_FMS;
}
if (cmd == CMD_VIEWFULL) {
write_log(" Track Plength Ulength Cmode USUM HCRC DCRC Cflag\n");
write_log(" ------ ------- ------- ------ ---- ---- ---- -----\n");
}
if (((cmd==CMD_UNPACK) || (cmd==CMD_SHOWBANNER)) && (geninfo & 2) && (!pwd))
return ERR_NOPASSWD;
ret=NO_PROBLEM;
Init_Decrunchers();
if (cmd != CMD_VIEW) {
if (cmd == CMD_SHOWBANNER) /* Banner is in the first track */
ret = Process_Track(fi,NULL,b1,b2,cmd,opt,(geninfo & 2)?pwd:0);
else {
while ( (ret=Process_Track(fi,fo,b1,b2,cmd,opt,(geninfo & 2)?pwd:0)) == NO_PROBLEM ) ;
}
}
if ((cmd == CMD_VIEWFULL) || (cmd == CMD_SHOWDIZ) || (cmd == CMD_SHOWBANNER)) write_log("\n");
if (ret == DMS_FILE_END) ret = NO_PROBLEM;
/* Used to give an error message, but I have seen some DMS */
/* files with texts or zeros at the end of the valid data */
/* So, when we find something that is not a track header, */
/* we suppose that the valid data is over. And say it's ok. */
if (ret == ERR_NOTTRACK) ret = NO_PROBLEM;
free(b1);
free(b2);
free(text);
return ret;
}
static USHORT Process_Track(struct zfile *fi, struct zfile *fo, UCHAR *b1, UCHAR *b2, USHORT cmd, USHORT opt, USHORT pwd){
USHORT hcrc, dcrc, usum, number, pklen1, pklen2, unpklen, l, r;
UCHAR cmode, flags;
l = (USHORT)zfile_fread(b1,1,THLEN,fi);
if (l != THLEN) {
if (l==0)
return DMS_FILE_END;
else
return ERR_SREAD;
}
/* "TR" identifies a Track Header */
if ((b1[0] != 'T')||(b1[1] != 'R')) return ERR_NOTTRACK;
/* Track Header CRC */
hcrc = (USHORT)((b1[THLEN-2] << 8) | b1[THLEN-1]);
if (CreateCRC(b1,(ULONG)(THLEN-2)) != hcrc) return ERR_THCRC;
number = (USHORT)((b1[2] << 8) | b1[3]); /* Number of track */
pklen1 = (USHORT)((b1[6] << 8) | b1[7]); /* Length of packed track data as in archive */
pklen2 = (USHORT)((b1[8] << 8) | b1[9]); /* Length of data after first unpacking */
unpklen = (USHORT)((b1[10] << 8) | b1[11]); /* Length of data after subsequent rle unpacking */
flags = b1[12]; /* control flags */
cmode = b1[13]; /* compression mode used */
usum = (USHORT)((b1[14] << 8) | b1[15]); /* Track Data CheckSum AFTER unpacking */
dcrc = (USHORT)((b1[16] << 8) | b1[17]); /* Track Data CRC BEFORE unpacking */
if (cmd == CMD_VIEWFULL) {
if (number==80)
write_log(" FileID ");
else if (number==0xffff)
write_log(" Banner ");
else if ((number==0) && (unpklen==1024))
write_log(" FakeBB ");
else
write_log(" %2d ",(short)number);
write_log("%5d %5d %s %04X %04X %04X %0d\n", pklen1, unpklen, modes[cmode], usum, hcrc, dcrc, flags);
}
if ((pklen1 > TRACK_BUFFER_LEN) || (pklen2 >TRACK_BUFFER_LEN) || (unpklen > TRACK_BUFFER_LEN)) return ERR_BIGTRACK;
if (zfile_fread(b1,1,(size_t)pklen1,fi) != pklen1) return ERR_SREAD;
if (CreateCRC(b1,(ULONG)pklen1) != dcrc) return ERR_TDCRC;
/* track 80 is FILEID.DIZ, track 0xffff (-1) is Banner */
/* and track 0 with 1024 bytes only is a fake boot block with more advertising */
/* FILE_ID.DIZ is never encrypted */
if (pwd && (number!=80)) dms_decrypt(b1,pklen1);
if ((cmd == CMD_UNPACK) && (number<80) && (unpklen>2048)) {
r = Unpack_Track(b1, b2, pklen2, unpklen, cmode, flags);
if (r != NO_PROBLEM)
if (pwd)
return ERR_BADPASSWD;
else
return r;
if (usum != Calc_CheckSum(b2,(ULONG)unpklen))
if (pwd)
return ERR_BADPASSWD;
else
return ERR_CSUM;
if (zfile_fwrite(b2,1,(size_t)unpklen,fo) != unpklen) return ERR_CANTWRITE;
}
if ((cmd == CMD_SHOWBANNER) && (number == 0xffff)){
r = Unpack_Track(b1, b2, pklen2, unpklen, cmode, flags);
if (r != NO_PROBLEM)
if (pwd)
return ERR_BADPASSWD;
else
return r;
if (usum != Calc_CheckSum(b2,(ULONG)unpklen))
if (pwd)
return ERR_BADPASSWD;
else
return ERR_CSUM;
printbandiz(b2,unpklen);
}
if ((cmd == CMD_SHOWDIZ) && (number == 80)) {
r = Unpack_Track(b1, b2, pklen2, unpklen, cmode, flags);
if (r != NO_PROBLEM) return r;
if (usum != Calc_CheckSum(b2,(ULONG)unpklen)) return ERR_CSUM;
printbandiz(b2,unpklen);
}
return NO_PROBLEM;
}
static USHORT Unpack_Track(UCHAR *b1, UCHAR *b2, USHORT pklen2, USHORT unpklen, UCHAR cmode, UCHAR flags){
switch (cmode){
case 0:
/* No Compression */
memcpy(b2,b1,(size_t)unpklen);
break;
case 1:
/* Simple Compression */
if (Unpack_RLE(b1,b2,unpklen)) return ERR_BADDECR;
break;
case 2:
/* Quick Compression */
if (Unpack_QUICK(b1,b2,pklen2)) return ERR_BADDECR;
if (Unpack_RLE(b2,b1,unpklen)) return ERR_BADDECR;
memcpy(b2,b1,(size_t)unpklen);
break;
case 3:
/* Medium Compression */
if (Unpack_MEDIUM(b1,b2,pklen2)) return ERR_BADDECR;
if (Unpack_RLE(b2,b1,unpklen)) return ERR_BADDECR;
memcpy(b2,b1,(size_t)unpklen);
break;
case 4:
/* Deep Compression */
if (Unpack_DEEP(b1,b2,pklen2)) return ERR_BADDECR;
if (Unpack_RLE(b2,b1,unpklen)) return ERR_BADDECR;
memcpy(b2,b1,(size_t)unpklen);
break;
case 5:
case 6:
/* Heavy Compression */
if (cmode==5) {
/* Heavy 1 */
if (Unpack_HEAVY(b1,b2,flags & 7,pklen2)) return ERR_BADDECR;
} else {
/* Heavy 2 */
if (Unpack_HEAVY(b1,b2,flags | 8,pklen2)) return ERR_BADDECR;
}
if (flags & 4) {
/* Unpack with RLE only if this flag is set */
if (Unpack_RLE(b2,b1,unpklen)) return ERR_BADDECR;
memcpy(b2,b1,(size_t)unpklen);
}
break;
default:
return ERR_UNKNMODE;
}
if (!(flags & 1)) Init_Decrunchers();
return NO_PROBLEM;
}
/* DMS uses a lame encryption */
static void dms_decrypt(UCHAR *p, USHORT len){
USHORT t;
while (len--){
t = (USHORT) *p;
*p++ ^= (UCHAR)PWDCRC;
PWDCRC = (USHORT)((PWDCRC >> 1) + t);
}
}
static void printbandiz(UCHAR *m, USHORT len){
UCHAR *i,*j;
i=j=m;
while (i<m+len) {
if (*i == 10) {
*i=0;
write_log("%s\n",j);
j=i+1;
}
i++;
}
}
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