mirror of https://github.com/AxioDL/nod.git
118 lines
3.2 KiB
C++
118 lines
3.2 KiB
C++
#include "NOD/DiscGCN.hpp"
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#define BUFFER_SZ 0x8000
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namespace NOD
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{
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class PartitionGCN : public DiscBase::IPartition
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{
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public:
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PartitionGCN(const DiscGCN& parent, Kind kind, uint64_t offset)
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: IPartition(parent, kind, offset)
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{
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/* GCN-specific header reads */
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std::unique_ptr<IPartReadStream> s = beginReadStream(0x420);
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uint32_t vals[3];
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s->read(vals, 12);
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m_dolOff = SBig(vals[0]);
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m_fstOff = SBig(vals[1]);
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m_fstSz = SBig(vals[2]);
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s->seek(0x2440 + 0x14);
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s->read(vals, 8);
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m_apploaderSz = 32 + SBig(vals[0]) + SBig(vals[1]);
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/* Yay files!! */
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parseFST(*s);
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/* Also make DOL header and size handy */
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s->seek(m_dolOff);
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parseDOL(*s);
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}
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class PartReadStream : public IPartReadStream
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{
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const PartitionGCN& m_parent;
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std::unique_ptr<IDiscIO::IReadStream> m_dio;
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uint64_t m_offset;
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size_t m_curBlock = SIZE_MAX;
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uint8_t m_buf[BUFFER_SZ];
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public:
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PartReadStream(const PartitionGCN& parent, uint64_t offset)
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: m_parent(parent), m_offset(offset)
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{
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size_t block = m_offset / BUFFER_SZ;
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m_dio = m_parent.m_parent.getDiscIO().beginReadStream(block * BUFFER_SZ);
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m_dio->read(m_buf, BUFFER_SZ);
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m_curBlock = block;
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}
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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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else
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return;
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size_t block = m_offset / BUFFER_SZ;
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if (block != m_curBlock)
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{
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m_dio->seek(block * BUFFER_SZ);
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m_dio->read(m_buf, BUFFER_SZ);
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m_curBlock = block;
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}
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}
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uint64_t position() const {return m_offset;}
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uint64_t read(void* buf, uint64_t length)
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{
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size_t block = m_offset / BUFFER_SZ;
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size_t cacheOffset = m_offset % BUFFER_SZ;
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uint64_t cacheSize;
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uint64_t rem = length;
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uint8_t* dst = (uint8_t*)buf;
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while (rem)
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{
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if (block != m_curBlock)
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{
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m_dio->read(m_buf, BUFFER_SZ);
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m_curBlock = block;
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}
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cacheSize = rem;
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if (cacheSize + cacheOffset > BUFFER_SZ)
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cacheSize = BUFFER_SZ - cacheOffset;
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memcpy(dst, m_buf + cacheOffset, cacheSize);
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dst += cacheSize;
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rem -= cacheSize;
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cacheOffset = 0;
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++block;
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}
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m_offset += length;
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return dst - (uint8_t*)buf;
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}
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};
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std::unique_ptr<IPartReadStream> beginReadStream(uint64_t offset) const
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{
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return std::unique_ptr<IPartReadStream>(new PartReadStream(*this, offset));
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}
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};
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DiscGCN::DiscGCN(std::unique_ptr<IDiscIO>&& dio)
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: DiscBase(std::move(dio))
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{
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/* One lone partition for GCN */
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m_partitions.emplace_back(new PartitionGCN(*this, IPartition::PART_DATA, 0));
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}
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bool DiscGCN::commit()
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{
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return false;
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}
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}
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