diff options
author | 2022-04-07 08:41:22 -0400 | |
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committer | 2022-04-07 14:41:22 +0200 | |
commit | efa6a9a11fed6b9301fe1b2339668bc2a09aa467 (patch) | |
tree | dcd35b63da8b882a01ed3d57b839a9ea2fab60f2 /src/lib/formats/fs_coco_os9.cpp | |
parent | b7e654b28d0432ed8e8afda9a30435fb07b7305d (diff) |
Adding support for formatting CoCo OS-9 file systems (#9434)
* Adding support for formatting CoCo OS-9 file systems
A caveat of this support is that there is no way for a FS implementation to get the actual floppy geometry. Therefore, we are currently hard coding the track count, head count and sector size
Diffstat (limited to 'src/lib/formats/fs_coco_os9.cpp')
-rw-r--r-- | src/lib/formats/fs_coco_os9.cpp | 171 |
1 files changed, 163 insertions, 8 deletions
diff --git a/src/lib/formats/fs_coco_os9.cpp b/src/lib/formats/fs_coco_os9.cpp index d203f731ba8..9bae816dfea 100644 --- a/src/lib/formats/fs_coco_os9.cpp +++ b/src/lib/formats/fs_coco_os9.cpp @@ -9,7 +9,7 @@ OS-9 Level 2 Technical Reference, Chapter 5, Random Block File Manager, page 2 - http://www.colorcomputerarchive.com/coco/Documents/Manuals/Operating Systems/OS-9 Level 2 Manual (Tandy).pdf + https://colorcomputerarchive.com/repo/Documents/Manuals/Operating%20Systems/OS-9%20Level%202%20Manual%20(Tandy).pdf ***************************************************************************/ @@ -66,7 +66,7 @@ void coco_os9_image::enumerate_f(floppy_enumerator &fe, u32 form_factor, const s bool coco_os9_image::can_format() const { - return false; + return true; } @@ -118,6 +118,7 @@ std::vector<meta_description> coco_os9_image::volume_meta_description() const { std::vector<meta_description> results; results.emplace_back(meta_description(meta_name::name, meta_type::string, "UNTITLED", false, [](const meta_value &m) { return m.as_string().size() <= 32; }, "Volume name, up to 32 characters")); + results.emplace_back(meta_description(meta_name::creation_date, meta_type::date, util::arbitrary_datetime::now(), false, nullptr, "Creation time")); return results; } @@ -201,6 +202,22 @@ std::string coco_os9_image::pick_os9_string(std::string_view raw_string) //------------------------------------------------- +// to_os9_string +//------------------------------------------------- + +std::string coco_os9_image::to_os9_string(std::string_view s, size_t length) +{ + std::string result(length, '\0'); + for (auto i = 0; i < std::min(length, s.size()); i++) + { + result[i] = (s[i] & 0x7F) + | (i == s.size() ? 0x80 : 0x00); + } + return result; +} + + +//------------------------------------------------- // pick_integer_be //------------------------------------------------- @@ -214,6 +231,38 @@ u32 coco_os9_image::pick_integer_be(const u8 *data, int length) //------------------------------------------------- +// from_os9_date +//------------------------------------------------- + +util::arbitrary_datetime coco_os9_image::from_os9_date(u32 os9_date, u16 os9_time) +{ + util::arbitrary_datetime dt; + memset(&dt, 0, sizeof(dt)); + dt.year = ((os9_date >> 16) & 0xFF) + 1900; + dt.month = (os9_date >> 8) & 0xFF; + dt.day_of_month = (os9_date >> 0) & 0xFF; + dt.hour = (os9_time >> 8) & 0xFF; + dt.minute = (os9_time >> 0) & 0xFF; + return dt; +} + + +//------------------------------------------------- +// to_os9_date +//------------------------------------------------- + +std::tuple<u32, u16> coco_os9_image::to_os9_date(const util::arbitrary_datetime &datetime) +{ + u32 os9_date = ((datetime.year - 1900) & 0xFF) << 16 + | (datetime.month & 0xFF) << 8 + | (datetime.day_of_month & 0xFF) << 0; + u16 os9_time = (datetime.hour & 0xFF) << 8 + | (datetime.minute & 0xFF) << 0; + return std::make_tuple(os9_date, os9_time); +} + + +//------------------------------------------------- // validate_filename //------------------------------------------------- @@ -276,12 +325,7 @@ coco_os9_image::file_header::file_header(fsblk_t::block_t &&block) util::arbitrary_datetime coco_os9_image::file_header::creation_date() const { - util::arbitrary_datetime dt; - memset(&dt, 0, sizeof(dt)); - dt.year = 1900 + m_block.r8(13); - dt.month = m_block.r8(14); - dt.day_of_month = m_block.r8(15); - return dt; + return from_os9_date(m_block.r24b(13)); } @@ -351,6 +395,7 @@ meta_data coco_os9_image::impl::metadata() { meta_data results; results.set(meta_name::name, m_volume_header.name()); + results.set(meta_name::creation_date, m_volume_header.creation_date()); return results; } @@ -378,6 +423,116 @@ void coco_os9_image::impl::drop_root_ref() //------------------------------------------------- +// impl::format +//------------------------------------------------- + +void coco_os9_image::impl::format(const meta_data &meta) +{ + // for some reason, the OS-9 world favored filling with 0xE5 + m_blockdev.fill(0xE5); + + // identify geometry info + u8 sectors = 18; // TODO - we need a definitive technique to get the floppy geometry + u8 heads = 1; // TODO - we need a definitive technique to get the floppy geometry + u16 sector_bytes = 256; // TODO - we need a definitive technique to get the floppy geometry + bool is_double_density = true; // TODO - we need a definitive technique to get the floppy geometry + u32 tracks = m_blockdev.block_count() / sectors / heads; + + // get attributes from metadata + std::string volume_title = meta.get_string(meta_name::name, "UNTITLED"); + util::arbitrary_datetime creation_datetime = meta.get_date(meta_name::creation_date); + auto [creation_os9date, creation_os9time] = to_os9_date(creation_datetime); + + u32 lsn_count = m_blockdev.block_count(); + u16 cluster_size = 1; + u16 owner_id = 1; + u16 disk_id = 1; + u8 attributes = 0; + u32 allocation_bitmap_bits = lsn_count / cluster_size; + u32 allocation_bitmap_lsns = (allocation_bitmap_bits / 8 + sector_bytes - 1) / sector_bytes; + u8 format_flags = ((heads > 1) ? 0x01 : 0x00) + | (is_double_density ? 0x02 : 0x00); + + // volume header + auto volume_header = m_blockdev.get(0); + volume_header.fill(0x00); + volume_header.w24b(0, lsn_count); // DD.TOT - total secctors + volume_header.w8(3, sectors); // DD.TKS - track size in sectors + volume_header.w16b(4, (allocation_bitmap_bits + 7) / 8); // DD.MAP - allocation bitmap in bytes + volume_header.w16b(6, cluster_size); // DD.BIT - cluster size + volume_header.w24b(8, 1 + allocation_bitmap_lsns); // DD.DIR - root directory LSN + volume_header.w16b(11, owner_id); // DD.OWN - owner ID + volume_header.w8(13, attributes); // DD.ATT - Dattributes + volume_header.w16b(14, disk_id); // DD.DSK - disk ID + volume_header.w8(16, format_flags); // DD.FMT - format flags + volume_header.w16b(17, sectors); // DD.SPT - sectors per track + volume_header.w24b(26, creation_os9date); // DD.DAT - date of creation + volume_header.w16b(29, creation_os9time); // DD.DAT - time of creation + volume_header.wstr(31, to_os9_string(volume_title, 32)); // DD.NAM - title + volume_header.w16b(103, sector_bytes / 256); // sector bytes + + // path descriptor options + volume_header.w8(0x3f + 0x00, 1); // device class + volume_header.w8(0x3f + 0x01, 1); // drive number + volume_header.w8(0x3f + 0x03, 0x20); // device type + volume_header.w8(0x3f + 0x04, 1); // density capability + volume_header.w16b(0x3f + 0x05, tracks); // number of tracks + volume_header.w8(0x3f + 0x07, heads); // number of sides + volume_header.w16b(0x3f + 0x09, sectors); // sectors per track + volume_header.w16b(0x3f + 0x0b, sectors); // sectors on track zero + volume_header.w8(0x3f + 0x0d, 3); // sector interleave factor + volume_header.w8(0x3f + 0x0e, 8); // default sectors per allocation + + // allocation bitmap + u32 total_allocated_sectors = 1 + allocation_bitmap_lsns + 1 + 8; + std::vector<u8> abblk_bytes; + abblk_bytes.resize(sector_bytes); + for (u32 i = 0; i < allocation_bitmap_lsns; i++) + { + for (u32 j = 0; j < sector_bytes; j++) + { + u32 pos = (i * sector_bytes + j) * 8; + if (pos + 8 < total_allocated_sectors) + abblk_bytes[j] = 0xFF; + else if (pos >= total_allocated_sectors) + abblk_bytes[j] = 0x00; + else + abblk_bytes[j] = ~((1 << (8 - total_allocated_sectors + pos)) - 1); + } + + auto abblk = m_blockdev.get(1 + i); + abblk.copy(0, abblk_bytes.data(), sector_bytes); + } + + // root directory header + auto roothdr_blk = m_blockdev.get(1 + allocation_bitmap_lsns); + roothdr_blk.fill(0x00); + roothdr_blk.w8(0x00, 0xBF); + roothdr_blk.w8(0x01, 0x00); + roothdr_blk.w8(0x02, 0x00); + roothdr_blk.w24b(0x03, creation_os9date); + roothdr_blk.w16b(0x06, creation_os9time); + roothdr_blk.w8(0x08, 0x01); + roothdr_blk.w8(0x09, 0x00); + roothdr_blk.w8(0x0A, 0x00); + roothdr_blk.w8(0x0B, 0x00); + roothdr_blk.w8(0x0C, 0x40); + roothdr_blk.w24b(0x0D, creation_os9date); + roothdr_blk.w24b(0x10, 1 + allocation_bitmap_lsns + 1); + roothdr_blk.w16b(0x13, 8); + + // root directory data + auto rootdata_blk = m_blockdev.get(1 + allocation_bitmap_lsns + 1); + rootdata_blk.fill(0x00); + rootdata_blk.w8(0x00, 0x2E); + rootdata_blk.w8(0x01, 0xAE); + rootdata_blk.w8(0x1F, 1 + allocation_bitmap_lsns); + rootdata_blk.w8(0x20, 0xAE); + rootdata_blk.w8(0x3F, 1 + allocation_bitmap_lsns); +} + + +//------------------------------------------------- // impl::open_directory //------------------------------------------------- |