mirror of
https://github.com/marqs85/ossc
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84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
//
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// Copyright (C) 2020 Ari Sundholm <megari@iki.fi>
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//
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// This file has been contributed to the Open Source Scan Converter project
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// developed by Markus Hiienkari Markus Hiienkari <mhiienka@niksula.hut.fi>
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// and other members of the retro gaming community.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program 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. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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#ifndef FAT16_EXPORT_H_
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#define FAT16_EXPORT_H_
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#include "alt_types.h"
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/* Use a sector size of 512 bytes. */
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#define FAT16_SECTOR_SIZE 512U
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/* This volume has 2048-byte clusters. */
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#define FAT16_CLUSTER_SIZE 2048U
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#define FAT16_SECTORS_PER_CLUSTER (FAT16_CLUSTER_SIZE/FAT16_SECTOR_SIZE)
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/* Offsets of the two File Allocation Tables. */
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#define FAT16_1_OFS 0x10000UL
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#define FAT16_2_OFS 0x14000UL
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/* Each FAT16 entry is a 16-bit little-endian integer. */
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#define FAT16_ENTRY_SIZE 2U
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#define FAT16_ENTRY_SHIFT 1U
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#define FAT16_ENTRIES_PER_SECTOR (FAT16_SECTOR_SIZE >> FAT16_ENTRY_SHIFT)
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/* On this volume, each FAT will be 16 kiB in size. */
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#define FAT16_SIZE 0x04000UL
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/* The first sector of the root directory. */
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#define FAT16_ROOT_DIR_FIRST_SECTOR 192U
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/* The length of the root directory in sectors. */
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#define FAT16_ROOT_DIR_SECTORS 128U
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/*
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* Define the properties and contents of the directory entry for the
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* settings file.
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*/
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#define PROF_DIRENT_16_OFS 0x18000UL
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#define PROF_DIRENT_16_SIZE 32U
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extern const alt_u8 prof_dirent_16[PROF_DIRENT_16_SIZE];
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#define PROF_16_DATA_OFS 0x028000UL
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#define PROF_16_DATA_SIZE 0x100200UL
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#define PROF_16_CLUSTER_COUNT ((PROF_16_DATA_SIZE/FAT16_CLUSTER_SIZE)+!!(PROF_16_DATA_SIZE%FAT16_CLUSTER_SIZE))
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/* Profile file data starts at offset 0x00028000 */
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/* Profile file data ends at offset 0x00128200 */
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/* Profile file data is 1049088 bytes long. */
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/* Generate a FAT16 boot sector.
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* buf must be at least FAT16_BOOT_SECTOR_SIZE bytes long,
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* and is assumed to be pre-zeroed.
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*/
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void generate_boot_sector_16(alt_u8 *buf);
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/*
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* Generate a FAT of a FAT16 volume.
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* The buffer is assumed to be zeroed out and have a size of at least 512 bytes.
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* The number of clusters already written are given as an argument.
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* The function returns the total number of clusters written so far.
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*/
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alt_u16 generate_fat16(void *buf, alt_u16 written);
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#endif // FAT16_EXPORT_H_
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