72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
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#include <hex/providers/memory_provider.hpp>
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#include <cstring>
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namespace hex::prv {
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bool MemoryProvider::open() {
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if (m_data.empty()) {
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m_data.resize(1);
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}
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return true;
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}
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void MemoryProvider::readRaw(u64 offset, void *buffer, size_t size) {
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auto actualSize = this->getActualSize();
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if (actualSize == 0 || (offset + size) > actualSize || buffer == nullptr || size == 0)
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return;
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std::memcpy(buffer, &m_data.front() + offset, size);
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}
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void MemoryProvider::writeRaw(u64 offset, const void *buffer, size_t size) {
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if ((offset + size) > this->getActualSize() || buffer == nullptr || size == 0)
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return;
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std::memcpy(&m_data.front() + offset, buffer, size);
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}
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void MemoryProvider::resizeRaw(u64 newSize) {
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m_data.resize(newSize);
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}
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void MemoryProvider::insertRaw(u64 offset, u64 size) {
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auto oldSize = this->getActualSize();
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this->resizeRaw(oldSize + size);
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std::vector<u8> buffer(0x1000);
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const std::vector<u8> zeroBuffer(0x1000);
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auto position = oldSize;
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while (position > offset) {
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const auto readSize = std::min<size_t>(position - offset, buffer.size());
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position -= readSize;
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this->readRaw(position, buffer.data(), readSize);
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this->writeRaw(position, zeroBuffer.data(), readSize);
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this->writeRaw(position + size, buffer.data(), readSize);
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}
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}
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void MemoryProvider::removeRaw(u64 offset, u64 size) {
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auto oldSize = this->getActualSize();
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std::vector<u8> buffer(0x1000);
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const auto newSize = oldSize - size;
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auto position = offset;
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while (position < newSize) {
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const auto readSize = std::min<size_t>(newSize - position, buffer.size());
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this->readRaw(position + size, buffer.data(), readSize);
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this->writeRaw(position, buffer.data(), readSize);
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position += readSize;
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}
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this->resizeRaw(oldSize - size);
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}
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}
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