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 Process_Track(struct zfile *fi, struct zfile *fo, UCHAR *b1, UCHAR *b2, USHORT cmd, USHORT opt, int dmsflags, struct zfile **extra){ USHORT hcrc, dcrc, usum, number, pklen1, pklen2, unpklen, l; UCHAR cmode, flags; int crcerr = 0; 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 (dms_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 (dolog) write_log (L"DMS: track=%d\n", number); if (dolog) { if (number==80) write_log (L" FileID "); else if (number==0xffff) write_log (L" Banner "); else if ((number==0) && (unpklen==1024)) write_log (L" FakeBB "); else write_log (L" %2d ",(short)number); write_log (L"%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 (dms_CreateCRC(b1,(ULONG)pklen1) != dcrc) { log_error (number); crcerr = 1; } /* 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)) { memset(b2, 0, unpklen); if (!crcerr) Unpack_Track(b1, b2, pklen2, unpklen, cmode, flags, number, pklen1, usum, dmsflags & DMSFLAG_ENCRYPTED); if (number == 0 && zfile_ftell (fo) == 512 * 22) { // did we have another cylinder 0 already? uae_u8 *p; zfile_fseek (fo, 0, SEEK_SET); p = xcalloc (uae_u8, 512 * 22); zfile_fread (p, 512 * 22, 1, fo); addextra(L"BigFakeBootBlock", extra, p, 512 * 22); xfree (p); } zfile_fseek (fo, number * 512 * 22 * ((dmsflags & DMSFLAG_HD) ? 2 : 1), SEEK_SET); if (zfile_fwrite(b2,1,(size_t)unpklen,fo) != unpklen) return ERR_CANTWRITE; } else if (number == 0 && unpklen == 1024) { memset(b2, 0, unpklen); if (!crcerr) Unpack_Track(b1, b2, pklen2, unpklen, cmode, flags, number, pklen1, usum, dmsflags & DMSFLAG_ENCRYPTED); addextra(L"FakeBootBlock", extra, b2, unpklen); } if (crcerr) return NO_PROBLEM; if (number == 0xffff && extra){ Unpack_Track(b1, b2, pklen2, unpklen, cmode, flags, number, pklen1, usum, dmsflags & DMSFLAG_ENCRYPTED); addextra(L"Banner", extra, b2, unpklen); //printbandiz(b2,unpklen); } if (number == 80 && extra) { Unpack_Track(b1, b2, pklen2, unpklen, cmode, flags, number, pklen1, usum, dmsflags & DMSFLAG_ENCRYPTED); addextra(L"FILEID.DIZ", extra, b2, unpklen); //printbandiz(b2,unpklen); } return NO_PROBLEM; }