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OpenMW is an open implementation of the Morrowind engine
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2.7 kB · 106 lines
C++
at master
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107#include "file.hpp"
#include <cassert>#include <errno.h>#include <fcntl.h>#include <stdexcept>#include <string.h>#include <string>#include <sys/types.h>#include <unistd.h>
#include <components/files/conversion.hpp>
namespace Platform::File{
static auto getNativeHandle(Handle handle) { assert(handle != Handle::Invalid);
return static_cast<int>(handle); }
static int getNativeSeekType(SeekType seek) { if (seek == SeekType::Begin) return SEEK_SET; if (seek == SeekType::Current) return SEEK_CUR; if (seek == SeekType::End) return SEEK_END; return -1; }
Handle open(const std::filesystem::path& filename) {#ifdef O_BINARY static const int openFlags = O_RDONLY | O_BINARY;#else static const int openFlags = O_RDONLY;#endif
auto handle = ::open(filename.c_str(), openFlags, 0); if (handle == -1) { throw std::system_error(errno, std::generic_category(), std::string("Failed to open '") + Files::pathToUnicodeString(filename) + "' for reading"); } return static_cast<Handle>(handle); }
void close(Handle handle) { auto nativeHandle = getNativeHandle(handle);
::close(nativeHandle); }
void seek(Handle handle, size_t position, SeekType type /*= SeekType::Begin*/) { const auto nativeHandle = getNativeHandle(handle); const auto nativeSeekType = getNativeSeekType(type);
if (::lseek(nativeHandle, position, nativeSeekType) == -1) { throw std::system_error(errno, std::generic_category(), "An lseek() call failed"); } }
size_t size(Handle handle) { const auto oldPos = tell(handle);
seek(handle, 0, SeekType::End); const auto fileSize = tell(handle); seek(handle, oldPos, SeekType::Begin);
return static_cast<size_t>(fileSize); }
size_t tell(Handle handle) { auto nativeHandle = getNativeHandle(handle);
size_t position = ::lseek(nativeHandle, 0, SEEK_CUR); if (position == size_t(-1)) { throw std::system_error(errno, std::generic_category(), "An lseek() call failed"); } return position; }
size_t read(Handle handle, void* data, size_t size) { auto nativeHandle = getNativeHandle(handle);
int amount = ::read(nativeHandle, data, size); if (amount == -1) { throw std::system_error( errno, std::generic_category(), "An attempt to read " + std::to_string(size) + " bytes failed"); } return amount; }
}