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nod/lib/DiscIOWBFS.cpp

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#include <cinttypes>
#include <cstdint>
#include <cstring>
#include <memory>
#include "nod/IDiscIO.hpp"
#include "nod/IFileIO.hpp"
#include "nod/Util.hpp"
#include <logvisor/logvisor.hpp>
namespace nod {
#define ALIGN_LBA(x) (((x) + p->hd_sec_sz - 1) & (~(p->hd_sec_sz - 1)))
static uint8_t size_to_shift(uint32_t size) {
uint8_t ret = 0;
while (size) {
ret++;
size >>= 1;
}
return ret - 1;
}
class DiscIOWBFS : public IDiscIO {
std::unique_ptr<IFileIO> m_fio;
struct WBFSHead {
uint32_t magic;
// parameters copied in the partition for easy dumping, and bug reports
uint32_t n_hd_sec; // total number of hd_sec in this partition
uint8_t hd_sec_sz_s; // sector size in this partition
uint8_t wbfs_sec_sz_s; // size of a wbfs sec
uint8_t padding3[2];
uint8_t disc_table[0]; // size depends on hd sector size
};
std::unique_ptr<uint8_t[]> wbfsHead;
struct WBFSDiscInfo {
uint8_t disc_header_copy[0x100];
uint16_t wlba_table[0];
};
std::unique_ptr<uint8_t[]> wbfsDiscInfo;
struct WBFS {
/* hdsectors, the size of the sector provided by the hosting hard drive */
uint32_t hd_sec_sz;
uint8_t hd_sec_sz_s; // the power of two of the last number
uint32_t n_hd_sec; // the number of hd sector in the wbfs partition
/* standard wii sector (0x8000 bytes) */
uint32_t wii_sec_sz;
uint8_t wii_sec_sz_s;
uint32_t n_wii_sec;
uint32_t n_wii_sec_per_disc;
/* The size of a wbfs sector */
uint32_t wbfs_sec_sz;
uint32_t wbfs_sec_sz_s;
uint16_t n_wbfs_sec; // this must fit in 16 bit!
uint16_t n_wbfs_sec_per_disc; // size of the lookup table
uint32_t part_lba;
uint16_t max_disc;
uint32_t freeblks_lba;
uint32_t* freeblks;
uint16_t disc_info_sz;
uint32_t n_disc_open;
} wbfs;
static int _wbfsReadSector(IFileIO::IReadStream& rs, uint32_t lba, uint32_t count, void* buf) {
uint64_t off = lba;
off *= 512ULL;
rs.seek(off, SEEK_SET);
if (rs.read(buf, count * 512ULL) != count * 512ULL) {
LogModule.report(logvisor::Error, fmt("error reading disc"));
return 1;
}
return 0;
}
public:
DiscIOWBFS(SystemStringView fpin) : m_fio(NewFileIO(fpin)) {
/* Temporary file handle to read LBA table */
std::unique_ptr<IFileIO::IReadStream> rs = m_fio->beginReadStream();
if (!rs)
return;
WBFS* p = &wbfs;
WBFSHead tmpHead;
if (rs->read(&tmpHead, sizeof(tmpHead)) != sizeof(tmpHead)) {
LogModule.report(logvisor::Error, fmt("unable to read WBFS head"));
return;
}
unsigned hd_sector_size = 1 << tmpHead.hd_sec_sz_s;
unsigned num_hd_sector = SBig(tmpHead.n_hd_sec);
wbfsHead.reset(new uint8_t[hd_sector_size]);
WBFSHead* head = (WBFSHead*)wbfsHead.get();
rs->seek(0, SEEK_SET);
if (rs->read(head, hd_sector_size) != hd_sector_size) {
LogModule.report(logvisor::Error, fmt("unable to read WBFS head"));
return;
}
// constants, but put here for consistancy
p->wii_sec_sz = 0x8000;
p->wii_sec_sz_s = size_to_shift(0x8000);
p->n_wii_sec = (num_hd_sector / 0x8000) * hd_sector_size;
p->n_wii_sec_per_disc = 143432 * 2; // support for double layers discs..
p->part_lba = 0;
if (_wbfsReadSector(*rs, p->part_lba, 1, head))
return;
if (hd_sector_size && head->hd_sec_sz_s != size_to_shift(hd_sector_size)) {
LogModule.report(logvisor::Error, fmt("hd sector size doesn't match"));
return;
}
if (num_hd_sector && head->n_hd_sec != SBig(num_hd_sector)) {
LogModule.report(logvisor::Error, fmt("hd num sector doesn't match"));
return;
}
p->hd_sec_sz = 1 << head->hd_sec_sz_s;
p->hd_sec_sz_s = head->hd_sec_sz_s;
p->n_hd_sec = SBig(head->n_hd_sec);
p->n_wii_sec = (p->n_hd_sec / p->wii_sec_sz) * (p->hd_sec_sz);
p->wbfs_sec_sz_s = head->wbfs_sec_sz_s;
p->wbfs_sec_sz = 1 << p->wbfs_sec_sz_s;
p->n_wbfs_sec = p->n_wii_sec >> (p->wbfs_sec_sz_s - p->wii_sec_sz_s);
p->n_wbfs_sec_per_disc = p->n_wii_sec_per_disc >> (p->wbfs_sec_sz_s - p->wii_sec_sz_s);
p->disc_info_sz = ALIGN_LBA(uint16_t(sizeof(WBFSDiscInfo)) + p->n_wbfs_sec_per_disc * 2);
p->freeblks_lba = (p->wbfs_sec_sz - p->n_wbfs_sec / 8) >> p->hd_sec_sz_s;
p->freeblks = 0; // will alloc and read only if needed
p->max_disc = (p->freeblks_lba - 1) / (p->disc_info_sz >> p->hd_sec_sz_s);
if (p->max_disc > p->hd_sec_sz - sizeof(WBFSHead))
p->max_disc = p->hd_sec_sz - sizeof(WBFSHead);
p->n_disc_open = 0;
int disc_info_sz_lba = p->disc_info_sz >> p->hd_sec_sz_s;
if (head->disc_table[0]) {
wbfsDiscInfo.reset(new uint8_t[p->disc_info_sz]);
if (!wbfsDiscInfo) {
LogModule.report(logvisor::Error, fmt("allocating memory"));
return;
}
if (_wbfsReadSector(*rs, p->part_lba + 1, disc_info_sz_lba, wbfsDiscInfo.get()))
return;
p->n_disc_open++;
// for(i=0;i<p->n_wbfs_sec_per_disc;i++)
// printf("%d,",wbfs_ntohs(d->header->wlba_table[i]));
}
}
class ReadStream : public IReadStream {
friend class DiscIOWBFS;
const DiscIOWBFS& m_parent;
std::unique_ptr<IFileIO::IReadStream> fp;
uint64_t m_offset;
std::unique_ptr<uint8_t[]> m_tmpBuffer;
ReadStream(const DiscIOWBFS& parent, std::unique_ptr<IFileIO::IReadStream>&& fpin, uint64_t offset, bool& err)
: m_parent(parent), fp(std::move(fpin)), m_offset(offset), m_tmpBuffer(new uint8_t[parent.wbfs.hd_sec_sz]) {
if (!fp)
err = true;
}
int wbfsReadSector(uint32_t lba, uint32_t count, void* buf) {
return DiscIOWBFS::_wbfsReadSector(*fp, lba, count, buf);
}
int wbfsDiscRead(uint32_t offset, uint8_t* data, uint64_t len) {
const WBFS* p = &m_parent.wbfs;
const WBFSDiscInfo* d = (WBFSDiscInfo*)m_parent.wbfsDiscInfo.get();
uint16_t wlba = offset >> (p->wbfs_sec_sz_s - 2);
uint32_t iwlba_shift = p->wbfs_sec_sz_s - p->hd_sec_sz_s;
uint32_t lba_mask = (p->wbfs_sec_sz - 1) >> (p->hd_sec_sz_s);
uint64_t lba = (offset >> (p->hd_sec_sz_s - 2)) & lba_mask;
uint64_t off = offset & ((p->hd_sec_sz >> 2) - 1);
uint16_t iwlba = SBig(d->wlba_table[wlba]);
uint64_t len_copied;
int err = 0;
uint8_t* ptr = data;
if (!iwlba)
return 1;
if (off) {
off *= 4;
err = wbfsReadSector(p->part_lba + (iwlba << iwlba_shift) + lba, 1, m_tmpBuffer.get());
if (err)
return err;
len_copied = p->hd_sec_sz - off;
if (len < len_copied)
len_copied = len;
memcpy(ptr, m_tmpBuffer.get() + off, len_copied);
len -= len_copied;
ptr += len_copied;
lba++;
if (lba > lba_mask && len) {
lba = 0;
iwlba = SBig(d->wlba_table[++wlba]);
if (!iwlba)
return 1;
}
}
while (len >= p->hd_sec_sz) {
uint32_t nlb = len >> (p->hd_sec_sz_s);
if (lba + nlb > p->wbfs_sec_sz) // dont cross wbfs sectors..
nlb = p->wbfs_sec_sz - lba;
err = wbfsReadSector(p->part_lba + (iwlba << iwlba_shift) + lba, nlb, ptr);
if (err)
return err;
len -= nlb << p->hd_sec_sz_s;
ptr += nlb << p->hd_sec_sz_s;
lba += nlb;
if (lba > lba_mask && len) {
lba = 0;
iwlba = SBig(d->wlba_table[++wlba]);
if (!iwlba)
return 1;
}
}
if (len) {
err = wbfsReadSector(p->part_lba + (iwlba << iwlba_shift) + lba, 1, m_tmpBuffer.get());
if (err)
return err;
memcpy(ptr, m_tmpBuffer.get(), len);
}
return 0;
}
public:
uint64_t read(void* buf, uint64_t length) override {
uint8_t extra[4];
uint64_t rem_offset = m_offset % 4;
if (rem_offset) {
uint64_t rem_rem = 4 - rem_offset;
if (wbfsDiscRead((uint32_t)(m_offset / 4), extra, 4))
return 0;
memcpy(buf, extra + rem_offset, rem_rem);
if (wbfsDiscRead((uint32_t)(m_offset / 4 + 1), (uint8_t*)buf + rem_rem, length - rem_rem))
return 0;
} else {
if (wbfsDiscRead((uint32_t)(m_offset / 4), (uint8_t*)buf, length))
return 0;
}
m_offset += length;
return length;
}
uint64_t position() const override { return m_offset; }
void seek(int64_t offset, int whence) override {
if (whence == SEEK_SET)
m_offset = offset;
else if (whence == SEEK_CUR)
m_offset += offset;
}
};
std::unique_ptr<IReadStream> beginReadStream(uint64_t offset) const override {
bool err = false;
auto ret = std::unique_ptr<IReadStream>(new ReadStream(*this, m_fio->beginReadStream(), offset, err));
if (err)
return {};
return ret;
}
std::unique_ptr<IWriteStream> beginWriteStream(uint64_t offset) const override { return {}; }
};
std::unique_ptr<IDiscIO> NewDiscIOWBFS(SystemStringView path) { return std::make_unique<DiscIOWBFS>(path); }
} // namespace nod
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