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