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Use logical block for iv

This commit is contained in:
Jack Andersen 2019-11-23 20:00:48 -10:00
parent 6bf4f07129
commit c1a1d1abc8
1 changed files with 11 additions and 10 deletions
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21
lib/DiscIONFS.cpp
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@ -42,25 +42,26 @@ class DiscIONFS : public IDiscIO {
}
struct FBO {
uint32_t file, block, offset;
uint32_t file, block, lblock, offset;
};
FBO logicalToFBO(uint64_t offset) const {
auto blockAndRemBytes = std::lldiv(offset, 0x8000); /* 32768 bytes per block */
uint32_t i, physicalBlock;
for (i = 0, physicalBlock = 0; i < nfsHead.lbaRangeCount; ++i) {
uint32_t block = UINT32_MAX;
for (uint32_t i = 0, physicalBlock = 0; i < nfsHead.lbaRangeCount; ++i) {
const auto& range = nfsHead.lbaRanges[i];
if (blockAndRemBytes.quot >= range.startBlock && blockAndRemBytes.quot - range.startBlock < range.numBlocks) {
blockAndRemBytes.quot = physicalBlock + (blockAndRemBytes.quot - range.startBlock);
block = physicalBlock + (blockAndRemBytes.quot - range.startBlock);
break;
}
physicalBlock += range.numBlocks;
}
/* This offset has no physical mapping, read zeroes */
if (i == nfsHead.lbaRangeCount)
return {UINT32_MAX, UINT32_MAX, UINT32_MAX};
auto fileAndRemBlocks = std::lldiv(blockAndRemBytes.quot, 8000); /* 8000 blocks per file */
return {uint32_t(fileAndRemBlocks.quot), uint32_t(fileAndRemBlocks.rem), uint32_t(blockAndRemBytes.rem)};
if (block == UINT32_MAX)
return {UINT32_MAX, UINT32_MAX, UINT32_MAX, UINT32_MAX};
auto fileAndRemBlocks = std::lldiv(block, 8000); /* 8000 blocks per file */
return {uint32_t(fileAndRemBlocks.quot), uint32_t(fileAndRemBlocks.rem),
uint32_t(blockAndRemBytes.quot), uint32_t(blockAndRemBytes.rem)};
}
DiscIONFSShared(SystemStringView fpin, bool& err) {
@ -157,7 +158,7 @@ public:
ReadStream(std::shared_ptr<DiscIONFSShared> shared, uint64_t offset, bool& err)
: m_shared(std::move(shared)), m_aes(NewAES()),
m_physAddr({UINT32_MAX, UINT32_MAX, UINT32_MAX}), m_offset(offset) {
m_physAddr({UINT32_MAX, UINT32_MAX, UINT32_MAX, UINT32_MAX}), m_offset(offset) {
m_aes->setKey(m_shared->key);
setNewLogicalAddr(offset);
}
@ -212,7 +213,7 @@ public:
}
/* Decrypt */
const uint32_t ivBuf[] = {0, 0, 0, SBig(m_physAddr.block)};
const uint32_t ivBuf[] = {0, 0, 0, SBig(m_physAddr.lblock)};
m_aes->decrypt((const uint8_t*)ivBuf, m_encBuf, m_decBuf, 0x8000);
}