66 lines
2.5 KiB
C
66 lines
2.5 KiB
C
/* *****************************************************************************
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* libg1m/format/mcs/spreadsheet.h -- description of the MCS spreadsheet format.
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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_MCS_SPREADSHEET_H
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# define LIBG1M_FORMAT_MCS_SPREADSHEET_H
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# include <stdint.h>
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# include <libg1m/bcd.h>
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# pragma pack(1)
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/* Spreadsheets are more complicated than that.
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*
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* For normal ones, there is a header: */
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typedef struct g1m_mcs_spreadsheet_header_s {
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/* has subheader: 0x01 if yes */
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uint8_t g1m_mcs_spreadsheet_header_has_subheader;
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/* column count (max: 26), on 24 bits and non-aligned */
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uint32_t g1m_mcs_spreadsheet_header_column_count :24;
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} g1m_mcs_spreadsheet_header_t;
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/* Then, if it is a normal spreadsheet, there is a subheader,
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* a column directory and a column definition table.
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*
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* Here's the subheader: */
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typedef struct g1m_mcs_spreadsheet_subheader_s {
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/* alignment or magic? {0, 0, 0, 0} */
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uint8_t g1m_mcs_spreadsheet_subheader__align0[4];
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/* number of column definitions */
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uint32_t g1m_mcs_spreadsheet_subheader_defs_size;
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/* alignment or magic II? {0, 0, 0, 0} */
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uint8_t g1m_mcs_spreadsheet_subheader__align1[4];
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} g1m_mcs_spreadsheet_subheader_t;
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/* The column definition table is the main definition. It contains the row
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* directory, which is a 80-bytes long bitfield indicating if cells are empty
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* or not, and the list of non-empty cells.
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*
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* Each cell is a BCD structure (the real part of the number). Numbers in
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* spreadsheets can't have imaginary parts.
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*
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* The column directory is just a list of 4-bytes sizes of each column,
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* counting the row directory and the cells. It's easier to naviguate to
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* a column quicker. */
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# pragma pack()
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#endif /* LIBG1M_FORMAT_MCS_SPREADSHEET_H */
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