208 lines
6.9 KiB
C++
208 lines
6.9 KiB
C++
/*
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Convert files from and to MacBinary format.
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See docs/formats/MacBinary.md for more information on this format.
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Copyright (C) 2019, Guillaume Gonnet
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This program is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "conv/converters.h"
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#include "utils/buffer_stream.h"
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#include "commands.h"
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namespace maconv {
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namespace conv {
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// Precalculed CRC 16 table.
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static uint16_t kCrc16Table[256] = {
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0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
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0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
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0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
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0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
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0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
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0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
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0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
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0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
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0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
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0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
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0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
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0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
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0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
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0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
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0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
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0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
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0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
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0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
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0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
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0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
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0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
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0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
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0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
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0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
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0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
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0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
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0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
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0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
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0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
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0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
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0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
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0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
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};
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// Calculate CRC (Cyclic Redundancy Check) for some data.
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static uint16_t CalculateCRC(uint8_t *data, uint32_t size)
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{
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uint16_t crc = 0;
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for (uint8_t *end = data + size; data != end; data++)
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crc = (crc << 8) ^ kCrc16Table[(*data ^ (crc >> 8)) & 0x00FF];
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return crc;
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}
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// Return true if a file is in MacBinary format.
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bool IsFileMacBinary(fs::FileReader &reader)
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{
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IS_COND(reader.file_size >= 128);
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IS_COND(reader.ReadByte() == 0x0);
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auto byte = reader.ReadByte();
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IS_COND(byte > 0 && byte < 64);
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IS_COND(reader.ReadWordBE() > 0x1F000000);
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reader.Skip(68); // Byte #74
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IS_COND(reader.ReadByte() == 0x0);
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reader.Skip(7); // Byte #82
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IS_COND(reader.ReadByte() == 0x0);
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reader.Skip(39); // Byte #122
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auto half = reader.ReadHalfBE();
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IS_COND(half == 0 || half == 0x8181 || half == 0x8281);
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return true;
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}
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// Read and decode a MacBinary file.
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void ReadMacBinary(fs::FileReader &reader, fs::File &file)
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{
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reader.Skip(1);
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// Read name of the file.
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uint8_t filelength = reader.ReadByte();
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file.filename = reader.ReadString(filelength);
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reader.Skip(63 - filelength);
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// Read file type, creator and Finder flags.
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file.type = reader.ReadWordBE();
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file.creator = reader.ReadWordBE();
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file.flags = reader.ReadByte() << 8;
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// Read window information.
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reader.Skip(1);
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reader.Skip(4); // TODO: read file positions within its window.
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reader.Skip(4); // TODO: read folder ID and protected flags.
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// Read size of forks.
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file.data_size = reader.ReadWordBE();
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file.res_size = reader.ReadWordBE();
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// Read creation and modification dates.
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file.creation_date = reader.ReadMacDate();
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file.modif_date = reader.ReadMacDate();
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// Read second part of Finder flags.
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reader.Skip(2);
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file.flags |= reader.ReadByte();
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reader.Skip(22);
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// Assume that CRC is correct.
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// Set data and resource forks.
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file.data = reader.data + 128;
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file.res = reader.data + 128 + ((file.data_size + 127) & -128);
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}
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// Write a MacBinary file.
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void WriteMacBinary(fs::File &file, fs::FileWriter &base)
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{
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utils::BufferStreamBuf header_buf {124};
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std::ostream header_stream {&header_buf};
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fs::FileWriter writer {header_stream};
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// Write filename.
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writer.WriteByte(0x0);
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writer.WriteByte(file.filename.size());
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writer.WriteString(file.filename);
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writer.Fill(0x0, 63 - file.filename.size());
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// Write file type, creator and Finder flags.
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writer.WriteWordBE(file.type);
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writer.WriteWordBE(file.creator);
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writer.WriteByte(file.flags >> 8);
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// Write window information.
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writer.Fill(0x0, 1);
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writer.Fill(0x0, 4); // TODO: write file positions within its window.
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writer.Fill(0x0, 4); // TODO: write folder ID and protected flags.
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// Write size of ressource and data forks.
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writer.WriteWordBE(file.data_size);
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writer.WriteWordBE(file.res_size);
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// Write creation and modification dates.
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writer.WriteMacDate(file.creation_date);
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writer.WriteMacDate(file.modif_date);
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// Write second part of Finder flags.
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writer.Fill(0x0, 2);
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writer.WriteByte(file.flags & 0xFF);
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// Write MacBinary III magic strings/numbers.
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writer.WriteString("mBIN");
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writer.Fill(0x0, 16);
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writer.WriteByte(130);
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writer.WriteByte(129);
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// Calculate CRC and write the header.
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uint8_t *header_data = header_buf.buffer.get();
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base.Write(header_data, 124);
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base.WriteHalfBE(CalculateCRC(header_data, 124));
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// Write data fork.
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base.Fill(0x0, 2);
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base.Write(file.data, file.data_size);
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// Write ressource fork.
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base.Fill(0x7F, ((file.data_size + 127) & -128) - file.data_size);
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base.Write(file.res, file.res_size);
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// Write remaning padding.
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base.Fill(0x7F, ((file.res_size + 127) & -128) - file.res_size);
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}
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} // namespace maconv
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} // namespace conv
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