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|
// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
// Management of Oric Jasmin floppy images
#include "fs_oric_jasmin.h"
#include "oric_dsk.h"
#include <stdexcept>
using namespace fs;
namespace fs { const oric_jasmin_image ORIC_JASMIN; }
// Floppy only, format is 41 tracks, 1/2 heads, 17 sectors.
// Filesystem has no subdirectories.
//
// References are pair of bytes (track + head*41, sector)
//
// Track 20 sector 1 has the free bitmap and the volume name
//
// offset 3*(track + head*41): bitmap from track, 24 bits LSB first,
// sector 1 in bit 16, sector 17 in bit 0.
// 0x01ffff is empty track. Special value
// 0x800000 marks a full track.
// offset f6-f7: 0x8080
// offset f8-ff: volume name, padded with 0x20
//
//
// Track 20 sector 2 has the first directory sector.
// Directory sector format:
// offset 00-01: reference to the sector, (0, 0) for the first one
// offset 02-03: reference to the next sector, (0, 0) on the first sector if it's the end, (ff, 00) for the end of another sector
// offset 04+ : 14 file entries, 18 bytes each
// offset 00-01: reference to the first sector of the inode, (ff, xx) when no entry
// offset 02 : U/L for (U)nlocked or (L)ocked file
// offset 03-0e: filename.ext, space padding between filename and '.'
// offset 0f : S/D for (S)equential (normal) or (D)irect-access files
// offset 10-11: number of sectors used by the file, including inode, little-endian
//
// Inodes:
// offset 00-01: reference to the next inode sector, (ff, 00) on the last one
// offset 02-03: loading address for the file on the first sector, ffff otherwise
// offset 04-05: length of the file in bytes on the first sector, ffff otherwise
// offset 06+ : reference to data sectors, (ff, ff) when done
namespace {
class impl : public filesystem_t {
public:
impl(fsblk_t &blockdev);
virtual ~impl() = default;
virtual void format(const meta_data &meta) override;
virtual meta_data metadata() override;
virtual void metadata_change(const meta_data &info) override;
virtual dir_t root() override;
static u32 cs_to_block(u16 ref);
[[maybe_unused]] static u16 block_to_cs(u32 block);
bool ref_valid(u16 ref);
static std::string read_file_name(const u8 *p);
void drop_root_ref();
std::vector<u16> allocate_blocks(u32 count);
void free_blocks(const std::vector<u16> &blocks);
u32 free_block_count();
static std::string file_name_prepare(std::string name);
private:
dir_t m_root;
class root_dir : public idir_t {
public:
root_dir(impl &i) : m_fs(i) {}
virtual ~root_dir() = default;
virtual void drop_weak_references() override;
virtual meta_data metadata() override;
virtual void metadata_change(const meta_data &info) override;
virtual std::vector<dir_entry> contents() override;
virtual file_t file_get(u64 key) override;
virtual dir_t dir_get(u64 key) override;
virtual file_t file_create(const meta_data &info) override;
virtual void file_delete(u64 key) override;
void update_file(u16 key, const u8 *entry);
private:
impl &m_fs;
std::pair<fsblk_t::block_t, u32> get_dir_block(u64 key);
};
class file : public impl::ifile_t {
public:
file(impl &fs, root_dir *dir, const u8 *entry, u16 key);
virtual ~file() = default;
virtual void drop_weak_references() override;
virtual meta_data metadata() override;
virtual void metadata_change(const meta_data &info) override;
virtual std::vector<u8> read_all() override;
virtual void replace(const std::vector<u8> &data) override;
private:
impl &m_fs;
root_dir *m_dir;
u16 m_key;
u8 m_entry[18];
};
class system_file : public impl::ifile_t {
public:
system_file(impl &fs, root_dir *dir, const u8 *entry, u16 key);
virtual ~system_file() = default;
virtual void drop_weak_references() override;
virtual meta_data metadata() override;
virtual void metadata_change(const meta_data &info) override;
virtual std::vector<u8> read_all() override;
virtual void replace(const std::vector<u8> &data) override;
private:
impl &m_fs;
root_dir *m_dir;
u16 m_key;
u8 m_entry[18];
};
};
}
meta_data impl::metadata()
{
meta_data res;
auto bdir = m_blockdev.get(20*17);
int len = 8;
while(len > 0 && bdir.rodata()[0xf8 + len - 1] == ' ')
len--;
res.set(meta_name::name, bdir.rstr(0xf8, len));
return res;
}
bool oric_jasmin_image::validate_filename(std::string name)
{
auto pos = name.find('.');
if(pos != std::string::npos)
return pos <= 8 && pos > 0 && name.size()-pos-1 <= 3;
else
return name.size() > 0 && name.size() <= 8;
}
std::vector<meta_description> oric_jasmin_image::file_meta_description() const
{
std::vector<meta_description> res;
res.emplace_back(meta_description(meta_name::name, meta_type::string, "", false, [](const meta_value &m) { return validate_filename(m.as_string()); }, "File name, 8.3"));
res.emplace_back(meta_description(meta_name::loading_address, meta_type::number, 0x501, false, [](const meta_value &m) { return m.as_number() < 0x10000; }, "Loading address of the file"));
res.emplace_back(meta_description(meta_name::length, meta_type::number, 0, true, nullptr, "Size of the file in bytes"));
res.emplace_back(meta_description(meta_name::size_in_blocks, meta_type::number, 0, true, nullptr, "Number of blocks used by the file"));
res.emplace_back(meta_description(meta_name::locked, meta_type::flag, false, false, nullptr, "File locked"));
res.emplace_back(meta_description(meta_name::sequential, meta_type::flag, true, false, nullptr, "File sequential"));
return res;
}
void impl::format(const meta_data &meta)
{
std::string volume_name = meta.get_string(meta_name::name, "UNTITLED");
u32 blocks = m_blockdev.block_count();
m_blockdev.fill(0x6c);
u32 bblk = 20*17;
auto fmap = m_blockdev.get(bblk);
u32 off = 0;
for(u32 blk = 0; blk != blocks; blk += 17) {
if(blk == bblk)
fmap.w24l(off, 0x07fff);
else
fmap.w24l(off, 0x1ffff);
off += 3;
}
for(u32 blk = blocks; blk != 17*42*2; blk += 17) {
fmap.w24l(off, 0x800000);
off += 3;
}
fmap.w8(0xf6, 0x80);
fmap.w8(0xf7, 0x80);
volume_name.resize(8, ' ');
fmap.wstr(0xf8, volume_name);
auto bdir = m_blockdev.get(20*17+1);
bdir.fill(0xff);
bdir.w16l(0, 0x0000);
bdir.w16l(2, 0x0000);
}
impl::impl(fsblk_t &blockdev) : filesystem_t(blockdev, 256), m_root(true)
{
}
bool impl::ref_valid(u16 ref)
{
u8 track = ref >> 8;
u8 sector = ref & 0xff;
if(sector < 1 || sector > 17)
return false;
if(track >= m_blockdev.block_count()/17)
return false;
return true;
}
u32 impl::cs_to_block(u16 ref)
{
u8 track = ref >> 8;
u8 sector = ref & 0xff;
return track * 17 + sector - 1;
}
u16 impl::block_to_cs(u32 block)
{
u8 track = block / 17;
u8 sector = (block % 17) + 1;
return (track << 8) | sector;
}
std::string impl::read_file_name(const u8 *p)
{
int main_len;
for(main_len = 8; main_len > 0; main_len--)
if(p[main_len - 1] != ' ')
break;
int ext_len;
for(ext_len = 4; ext_len > 0; ext_len--)
if(p[ext_len + 8 - 1] != ' ')
break;
std::string name;
for(int i=0; i != main_len; i++)
name += char(p[i]);
for(int i=0; i != ext_len; i++)
name += char(p[8 + i]);
return name;
}
filesystem_t::dir_t impl::root()
{
if(!m_root)
m_root = new root_dir(*this);
return m_root.strong();
}
void impl::drop_root_ref()
{
m_root = nullptr;
}
void impl::root_dir::drop_weak_references()
{
m_fs.drop_root_ref();
}
meta_data impl::root_dir::metadata()
{
return meta_data();
}
std::vector<dir_entry> impl::root_dir::contents()
{
std::vector<dir_entry> res;
auto bdir = m_fs.m_blockdev.get(20*17+1);
u64 id = 0;
for(;;) {
for(u32 i = 0; i != 14; i ++) {
u32 off = 4 + i*18;
u16 ref = bdir.r16b(off);
std::string fname = read_file_name(bdir.rodata()+off+3);
bool system = ref == 0 && id == 0 && bdir.r32b(off+0xb) == 0x2e535953;
if(system)
res.emplace_back(dir_entry(fname, dir_entry_type::system_file, 0));
else if(m_fs.ref_valid(ref))
res.emplace_back(dir_entry(fname, dir_entry_type::file, id));
id++;
}
u16 ref = bdir.r16b(2);
if(!ref || !m_fs.ref_valid(ref))
break;
bdir = m_fs.m_blockdev.get(cs_to_block(ref));
}
return res;
}
std::pair<fsblk_t::block_t, u32> impl::root_dir::get_dir_block(u64 key)
{
auto bdir = m_fs.m_blockdev.get(20*17+1);
while(key >= 14) {
u16 ref = bdir.r16b(2);
if(!ref || !m_fs.ref_valid(ref))
throw std::invalid_argument("Incorrect file key");
bdir = m_fs.m_blockdev.get(cs_to_block(ref));
key -= 14;
}
return std::pair<fsblk_t::block_t, u32>(bdir, 4 + key * 18);
}
filesystem_t::file_t impl::root_dir::file_get(u64 key)
{
u64 rkey = key;
auto [bdir, off] = get_dir_block(rkey);
u16 ref = bdir.r16b(off);
bool system = ref == 0 && key == 0 && bdir.r32b(off+0xb) == 0x2e535953;
if(system)
return file_t(new system_file(m_fs, this, bdir.rodata() + off, key));
if(!m_fs.ref_valid(ref))
throw std::invalid_argument("Key to deleted/non-existent file");
return file_t(new file(m_fs, this, bdir.rodata() + off, key));
}
void impl::root_dir::update_file(u16 key, const u8 *entry)
{
u64 rkey = key;
auto [bdir, off] = get_dir_block(rkey);
bdir.copy(off, entry, 18);
}
filesystem_t::dir_t impl::root_dir::dir_get(u64 key)
{
throw std::logic_error("Directories not supported");
}
std::string impl::file_name_prepare(std::string fname)
{
std::string nname;
size_t i;
for(i = 0; i != 8 && i != fname.size() && fname[i] != '.'; i++)
nname += fname[i];
if(nname.size() != 8)
nname.insert(nname.end(), 8 - nname.size(), ' ');
nname += '.';
while(i != fname.size() && fname[i] != '.')
i++;
if(i != fname.size())
i++;
while(i != fname.size() && nname.size() != 12)
nname += fname[i++];
if(nname.size() != 12)
nname.insert(nname.end(), 12 - nname.size(), ' ');
return nname;
}
impl::file::file(impl &fs, root_dir *dir, const u8 *entry, u16 key) : m_fs(fs), m_dir(dir), m_key(key)
{
memcpy(m_entry, entry, 18);
}
void impl::file::drop_weak_references()
{
}
meta_data impl::file::metadata()
{
meta_data res;
res.set(meta_name::name, read_file_name(m_entry + 3));
res.set(meta_name::locked, m_entry[2] == 'L');
res.set(meta_name::sequential, m_entry[0xf] == 'S');
res.set(meta_name::size_in_blocks, r16l(m_entry + 0x10));
u16 ref = r16b(m_entry);
auto dblk = m_fs.m_blockdev.get(cs_to_block(ref));
res.set(meta_name::loading_address, dblk.r16l(2));
res.set(meta_name::length, dblk.r16l(4));
return res;
}
std::vector<u8> impl::file::read_all()
{
std::vector<u8> data;
u16 ref = r16b(m_entry);
auto iblk = m_fs.m_blockdev.get(cs_to_block(ref));
u32 length = iblk.r16l(4);
while(m_fs.ref_valid(ref)) {
for(u32 pos = 6; pos != 256 && data.size() < length; pos += 2) {
u16 dref = iblk.r16b(pos);
if(!m_fs.ref_valid(dref))
goto done;
auto dblk = m_fs.m_blockdev.get(cs_to_block(dref));
u32 dpos = data.size();
data.resize(dpos + 256);
memcpy(data.data() + dpos, dblk.rodata(), 256);
if(data.size() >= length)
goto done;
}
ref = iblk.r16b(2);
if(!m_fs.ref_valid(ref))
break;
iblk = m_fs.m_blockdev.get(cs_to_block(ref));
}
done:
data.resize(length);
return data;
}
impl::system_file::system_file(impl &fs, root_dir *dir, const u8 *entry, u16 key) : m_fs(fs), m_dir(dir), m_key(key)
{
memcpy(m_entry, entry, 18);
}
void impl::system_file::drop_weak_references()
{
}
meta_data impl::system_file::metadata()
{
meta_data res;
res.set(meta_name::name, read_file_name(m_entry + 3));
res.set(meta_name::locked, m_entry[2] == 'L');
res.set(meta_name::sequential, m_entry[0xf] == 'S');
res.set(meta_name::size_in_blocks, r16l(m_entry + 0x10));
res.set(meta_name::length, 0x3e00);
return res;
}
std::vector<u8> impl::system_file::read_all()
{
std::vector<u8> data(0x3e00);
for(u32 i = 0; i != 62; i++) {
auto dblk = m_fs.m_blockdev.get(i);
memcpy(data.data() + 256 * i, dblk.rodata(), 256);
}
return data;
}
impl::file_t impl::root_dir::file_create(const meta_data &info)
{
// One block of sector list, one block of data
u32 nb = 2;
// Find the key for the next entry, increase nb if needed
auto bdir = m_fs.m_blockdev.get(20*17+1);
u64 id = 0;
for(;;) {
for(u32 i = 0; i != 14; i ++) {
u32 off = 4 + i*18;
u16 ref = bdir.r16b(off);
if(!m_fs.ref_valid(ref))
goto found;
id++;
}
u16 ref = bdir.r16b(2);
if(!ref || !m_fs.ref_valid(ref)) {
nb ++;
break;
}
bdir = m_fs.m_blockdev.get(cs_to_block(ref));
}
found:
auto block = m_fs.allocate_blocks(nb);
if(block.empty())
return nullptr;
auto sblk = m_fs.m_blockdev.get(cs_to_block(block[0]));
sblk.w16b(0, 0xff00); // Next sector
sblk.w16l(2, info.get_number(meta_name::loading_address, 0x500));
sblk.w16l(4, 0); // Length
sblk.w16b(6, block[1]); // Data block
if(nb == 3) {
bdir.w16l(0, block[2]); // Link to the next directory sector
bdir = m_fs.m_blockdev.get(cs_to_block(block[2]));
bdir.fill(0xff);
bdir.w16l(0, block[2]); // Reference to itself
bdir.w16l(2, 0xff00); // No next directory sector
}
u32 off = 4 + (id % 14) * 18;
bdir.w16b(off+0x00, block[0]); // First (and only) sector in the sector list
bdir.w8 (off+0x02, info.get_flag(meta_name::locked, false) ? 'L' : 'U');
bdir.wstr(off+0x03, file_name_prepare(info.get_string(meta_name::name, "")));
bdir.w8 (off+0x0f, info.get_flag(meta_name::sequential, true) ? 'S' : 'D');
bdir.w16l(off+0x10, 2); // 2 sectors for an empty file
return file_t(new file(m_fs, this, bdir.rodata() + off, id));
}
void impl::root_dir::file_delete(u64 key)
{
}
void impl::file::replace(const std::vector<u8> &data)
{
u32 cur_ns = r16l(m_entry + 0x10);
// Data sectors first
u32 need_ns = (data.size() + 255) / 256;
if(need_ns == 0)
need_ns = 1;
// Add the sector list sectors, 125 entries/sector
need_ns += (need_ns + 124)/125;
// Enough space?
if(cur_ns < need_ns && m_fs.free_block_count() < need_ns - cur_ns)
return;
u16 load_address = 0;
std::vector<u16> tofree;
u16 iref = r16b(m_entry);
for(u32 i=0; i < cur_ns; i += 125+1) {
auto iblk = m_fs.m_blockdev.get(cs_to_block(iref));
if(!i)
load_address = iblk.r16l(2);
tofree.push_back(iref);
for(u32 j=0; j != 125 && i+j+1 != cur_ns; j++)
tofree.push_back(iblk.r16b(6+2*j));
iref = iblk.r16b(2);
}
m_fs.free_blocks(tofree);
std::vector<u16> blocks = m_fs.allocate_blocks(need_ns);
for(u32 i=0; i < need_ns; i += 125+1) {
auto iblk = m_fs.m_blockdev.get(cs_to_block(blocks[i]));
iblk.fill(0xff);
if(!i) {
iblk.w16l(2, load_address);
iblk.w16l(4, data.size());
}
if(i + 126 < need_ns)
iblk.w16b(0, blocks[i+126]);
else
iblk.w16b(0, 0xff00);
for(u32 j=0; j != 125 && i+j+1 != need_ns; j++) {
u32 dpos = 256 * (j + i/126*125);
u32 size = data.size() - dpos;
iblk.w16b(6+j*2, blocks[i+j+1]);
auto dblk = m_fs.m_blockdev.get(cs_to_block(blocks[i+j+1]));
if(size >= 256)
dblk.copy(0, data.data() + dpos, 256);
else {
dblk.copy(0, data.data() + dpos, size);
dblk.fill(size, 0x55, 256-size);
}
}
}
w16l(m_entry + 0x10, need_ns);
w16b(m_entry + 0x00, blocks[0]);
m_dir->update_file(m_key, m_entry);
}
void impl::root_dir::metadata_change(const meta_data &info)
{
}
void impl::metadata_change(const meta_data &info)
{
if(info.has(meta_name::name)) {
std::string volume_name = info.get_string(meta_name::name);
volume_name.resize(8, ' ');
m_blockdev.get(20*17).wstr(0xf8, volume_name);
}
}
void impl::file::metadata_change(const meta_data &info)
{
if(info.has(meta_name::locked))
w8 (m_entry+0x02, info.get_flag(meta_name::locked) ? 'L' : 'U');
if(info.has(meta_name::name))
wstr(m_entry+0x03, file_name_prepare(info.get_string(meta_name::name)));
if(info.has(meta_name::sequential))
w8 (m_entry+0x0f, info.get_flag(meta_name::sequential) ? 'D' : 'S');
if(info.has(meta_name::loading_address))
m_fs.m_blockdev.get(cs_to_block(r16b(m_entry))).w16l(2, info.get_number(meta_name::loading_address));
m_dir->update_file(m_key, m_entry);
}
void impl::system_file::replace(const std::vector<u8> &data)
{
if(data.size() != 0x3e00)
return;
for(u32 i=0; i != 0x3e; i++)
m_fs.m_blockdev.get(i).copy(0, data.data() + i * 256, 256);
}
void impl::system_file::metadata_change(const meta_data &info)
{
if(info.has(meta_name::locked))
w8 (m_entry+0x02, info.get_flag(meta_name::locked) ? 'L' : 'U');
if(info.has(meta_name::name))
wstr(m_entry+0x03, file_name_prepare(info.get_string(meta_name::name)));
if(info.has(meta_name::sequential))
w8 (m_entry+0x0f, info.get_flag(meta_name::sequential) ? 'S' : 'D');
if(info.has(meta_name::loading_address))
m_fs.m_blockdev.get(cs_to_block(r16b(m_entry))).w16l(2, info.get_number(meta_name::loading_address));
m_dir->update_file(m_key, m_entry);
}
std::vector<u16> impl::allocate_blocks(u32 count)
{
std::vector<u16> blocks;
if(free_block_count() < count)
return blocks;
auto fmap = m_blockdev.get(20*17);
u32 nf = 0;
for(u32 track = 0; track != 2*41 && nf != count; track++) {
u32 map = fmap.r24l(track*3);
if(map != 0x800000) {
for(u32 sect = 1; sect <= 17 && nf != count; sect++)
if(map & (0x20000 >> sect)) {
blocks.push_back((track << 8) | sect);
map &= ~(0x20000 >> sect);
nf++;
}
if(!map)
map = 0x800000;
fmap.w24l(track*3, map);
}
}
return blocks;
}
void impl::free_blocks(const std::vector<u16> &blocks)
{
auto fmap = m_blockdev.get(20*17);
for(u16 ref : blocks) {
u32 track = ref >> 8;
u32 sect = ref & 0xff;
u32 map = fmap.r24l(track*3);
if(map == 0x800000)
map = 0;
map |= 0x20000 >> sect;
fmap.w24l(track*3, map);
}
}
u32 impl::free_block_count()
{
auto fmap = m_blockdev.get(20*17);
u32 nf = 0;
for(u32 track = 0; track != 2*41; track++) {
u32 map = fmap.r24l(track*3);
if(map != 0x800000) {
for(u32 sect = 1; sect <= 17; sect++)
if(map & (0x20000 >> sect))
nf++;
}
}
return nf;
}
const char *oric_jasmin_image::name() const
{
return "oric_jasmin";
}
const char *oric_jasmin_image::description() const
{
return "Oric Jasmin";
}
void oric_jasmin_image::enumerate_f(floppy_enumerator &fe, u32 form_factor, const std::vector<u32> &variants) const
{
if(has(form_factor, variants, floppy_image::FF_3, floppy_image::DSDD))
fe.add(FLOPPY_ORIC_JASMIN_FORMAT, 356864, "oric_jasmin_ds", "Oric Jasmin dual-sided");
if(has(form_factor, variants, floppy_image::FF_3, floppy_image::SSDD))
fe.add(FLOPPY_ORIC_JASMIN_FORMAT, 178432, "oric_jasmin_ss", "Oric Jasmin single-sided");
}
std::unique_ptr<filesystem_t> oric_jasmin_image::mount(fsblk_t &blockdev) const
{
return std::make_unique<impl>(blockdev);
}
bool oric_jasmin_image::can_format() const
{
return true;
}
bool oric_jasmin_image::can_read() const
{
return true;
}
bool oric_jasmin_image::can_write() const
{
return true;
}
bool oric_jasmin_image::has_rsrc() const
{
return false;
}
std::vector<meta_description> oric_jasmin_image::volume_meta_description() const
{
std::vector<meta_description> res;
res.emplace_back(meta_description(meta_name::name, meta_type::string, "UNTITLED", false, [](const meta_value &m) { return m.as_string().size() <= 8; }, "Volume name, up to 8 characters"));
return res;
}
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