libcryfs/test/testutils/InMemoryFile.cpp

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#include "InMemoryFile.h"
using cpputils::Data;
InMemoryFile::InMemoryFile(Data data): _data(std::move(data)) {
}
InMemoryFile::~InMemoryFile() {
}
int InMemoryFile::read(void *buf, size_t count, off_t offset) const {
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size_t realCount = std::min(count, (size_t)(_data.size() - offset));
std::memcpy(buf, (uint8_t*)_data.data() + offset, realCount);
return realCount;
}
const void *InMemoryFile::data() const {
return _data.data();
}
bool InMemoryFile::fileContentEquals(const Data &expected, off_t offset) const {
return 0 == std::memcmp((uint8_t*)expected.data(), (uint8_t*)_data.data() + offset, expected.size());
}
size_t InMemoryFile::size() const {
return _data.size();
}
WriteableInMemoryFile::WriteableInMemoryFile(Data data): InMemoryFile(std::move(data)), _originalData(_data.copy()) {
}
void WriteableInMemoryFile::write(const void *buf, size_t count, off_t offset) {
_extendFileSizeIfNecessary(count + offset);
std::memcpy((uint8_t*)_data.data() + offset, buf, count);
}
void WriteableInMemoryFile::_extendFileSizeIfNecessary(size_t size) {
if (size > _data.size()) {
_extendFileSize(size);
}
}
void WriteableInMemoryFile::_extendFileSize(size_t size) {
Data newfile(size);
std::memcpy(newfile.data(), _data.data(), _data.size());
_data = std::move(newfile);
}
bool WriteableInMemoryFile::sizeUnchanged() const {
return _data.size() == _originalData.size();
}
bool WriteableInMemoryFile::regionUnchanged(off_t offset, size_t count) const {
return 0 == std::memcmp((uint8_t*)_data.data() + offset, (uint8_t*)_originalData.data() + offset, count);
}