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Don't store size in patternie structure

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Silent 2017-04-27 02:25:37 +02:00
parent 396f013961
commit 3310e2eea1
2 changed files with 5 additions and 8 deletions
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11
SilentPatch/Patterns.cpp
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@ -144,8 +144,6 @@ void pattern::Initialize(const char* pattern, size_t length)
// transform the base pattern from IDA format to canonical format
TransformPattern(std::string_view(pattern, length), m_bytes, m_mask);
m_size = m_mask.size();
#if PATTERNS_USE_HINTS
// if there's hints, try those first
if (m_module == GetModuleHandle(nullptr))
@ -193,13 +191,14 @@ void pattern::EnsureMatches(uint32_t maxCount)
const uint8_t* pattern = reinterpret_cast<const uint8_t*>(m_bytes.c_str());
const char* mask = m_mask.c_str();
size_t maskSize = m_mask.size();
size_t lastWild = m_mask.find_last_of('?');
ptrdiff_t Last[256];
std::fill(std::begin(Last), std::end(Last), lastWild == std::string::npos ? -1 : static_cast<ptrdiff_t>(lastWild) );
for ( ptrdiff_t i = 0; i < static_cast<ptrdiff_t>(m_size); ++i )
for ( ptrdiff_t i = 0; i < static_cast<ptrdiff_t>(maskSize); ++i )
{
if ( Last[ pattern[i] ] < i )
{
@ -207,10 +206,10 @@ void pattern::EnsureMatches(uint32_t maxCount)
}
}
for (uintptr_t i = executable.begin(), end = executable.end() - m_size; i <= end;)
for (uintptr_t i = executable.begin(), end = executable.end() - maskSize; i <= end;)
{
uint8_t* ptr = reinterpret_cast<uint8_t*>(i);
ptrdiff_t j = m_size - 1;
ptrdiff_t j = maskSize - 1;
while((j >= 0) && (mask[j] == '?' || pattern[j] == ptr[j])) j--;
@ -237,7 +236,7 @@ bool pattern::ConsiderMatch(uintptr_t offset)
char* ptr = reinterpret_cast<char*>(offset);
for (size_t i = 0; i < m_size; i++)
for (size_t i = 0, j = m_mask.size(); i < j; i++)
{
if (mask[i] == '?')
{

2
SilentPatch/Patterns.h
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@ -75,8 +75,6 @@ namespace hook
uint64_t m_hash;
#endif
size_t m_size;
std::vector<pattern_match> m_matches;
bool m_matched;