92 lines
2.4 KiB
Plaintext
92 lines
2.4 KiB
Plaintext
/* *****************************************************************************
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* libg1m/format/fxi.h -- the FXI file format description.
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* Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
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*
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* This file is part of libg1m.
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* libg1m is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 3.0 of the License,
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* or (at your option) any later version.
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*
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* libg1m is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libg1m; if not, see <http://www.gnu.org/licenses/>.
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* ************************************************************************** */
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#ifndef LIBG1M_FORMAT_FXI_H
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# define LIBG1M_FORMAT_FXI_H
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# include <stdint.h>
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# pragma pack(1)
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/* FXI is obfuscated with a symetrical obfuscation algorithm:
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* byte = byte ^ ~24;
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*
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* Once the format is deobfuscated, this is the header structure: */
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struct fxi_header {
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/* unknown - probably part of the magic? "\xD5\xD7\x1F" "f" */
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uint8_t _unknown[4];
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/* description: the description of the format (probably part of the
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* magic too): "FX-INTERFACE - YELLOW COMPUTING" */
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char description[31];
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uint8_t _unused[40];
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/* the number of meta entries */
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uint8_t num;
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uint8_t _unused2[80];
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/* sum of the number of meta entries and records */
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uint16_t sum;
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uint8_t _unused3;
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/* 0xFF, 0xFF, 0, 0, 0x0F, 0 */
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uint8_t _blackmagic[6];
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/* board type? CY */
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uint8_t board[2];
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/* introduction? */
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uint8_t type[11];
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};
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/* Then come the meta-entries, which have this structure: */
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struct fxi_entry {
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/* entry type: first type is 'NP', then {0x01, 0x80}. */
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uint8_t type[2];
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uint8_t _unused[2];
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/* entry number */
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uint8_t number;
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uint8_t _unused2[3];
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/* unknown: either 0x00, 0x01, 0x02 */
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uint8_t _unknown;
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uint8_t _unused3;
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/* unknown: either 0x00, 0x02, 0x03 */
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uint8_t _unknown2;
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uint8_t _unused4;
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/* unknown: checksum? */
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uint16_t checksum;
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uint8_t _unused5[2];
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/* unknown: some sort of type? */
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uint8_t typeid;
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uint8_t _unused6;
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/* size of the file name */
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uint8_t filename_size;
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/* TODO: finish me */
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};
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# pragma pack()
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#endif
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