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Decompile fn_18142 (CMemMapPakFile::Read)

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Batch #11715 by cremane: 0 byte-identical, 1 confirmed by peer review.

- fn_18142 CMemMapPakFile::Read: logic confirmed by peer review

Peer-reviewed-by: Yommy, KWDev
Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).
This commit is contained in:
ragnarok-clanker 2026-11-05 04:29:46 +00:00
commit 24401fdd20
1 changed files with 12 additions and 9 deletions
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31
Source/Archive/MemMapPakFile.cpp
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@ -76,27 +76,30 @@ std::uint8_t* CMemMapPakFile::Read(std::uint64_t offset, std::uint32_t length) {
this->m_view = nullptr;
}
while (this->m_windowSize >= length + (static_cast<std::uint32_t>(offset) & ~static_cast<std::uint32_t>(this->m_offsetMask))) {
this->m_viewOffset = offset & this->m_offsetMask;
this->m_viewSize = this->m_windowSize;
SIZE_T bytes = this->m_windowSize;
if (this->m_viewOffset + this->m_windowSize > this->m_size) {
bytes = 0;
this->m_viewSize = static_cast<std::uint32_t>(this->m_size - this->m_viewOffset);
while (this->m_windowSize) {
if (this->m_windowSize < length + (static_cast<std::uint32_t>(offset) & ~static_cast<std::uint32_t>(this->m_offsetMask))) {
break;
}
this->m_viewOffset = offset & this->m_offsetMask;
this->m_viewSize = this->m_windowSize;
if (this->m_viewOffset + this->m_windowSize > this->m_size) {
this->m_view = static_cast<std::uint8_t*>(
MapViewOfFile(this->m_mapping, FILE_MAP_READ, static_cast<DWORD>(this->m_viewOffset >> 32), static_cast<DWORD>(this->m_viewOffset), 0)
);
this->m_viewSize = static_cast<std::uint32_t>(this->m_size - this->m_viewOffset);
} else {
this->m_view = static_cast<std::uint8_t*>(MapViewOfFile(
this->m_mapping, FILE_MAP_READ, static_cast<DWORD>(this->m_viewOffset >> 32), static_cast<DWORD>(this->m_viewOffset), this->m_windowSize
));
}
this->m_view = static_cast<std::uint8_t*>(
MapViewOfFile(this->m_mapping, FILE_MAP_READ, static_cast<DWORD>(this->m_viewOffset >> 32), static_cast<DWORD>(this->m_viewOffset), bytes)
);
if (this->m_view) {
return this->m_view + static_cast<std::uint32_t>(offset - this->m_viewOffset);
}
this->m_windowSize >>= 1;
if (!this->m_windowSize) {
break;
}
}
CloseHandle(this->m_mapping);