diff options
Diffstat (limited to 'src/common.cpp')
| -rw-r--r-- | src/common.cpp | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/src/common.cpp b/src/common.cpp index b132c26b0..8a220c799 100644 --- a/src/common.cpp +++ b/src/common.cpp @@ -850,6 +850,127 @@ ReadDirectoryError read_directory(String path, Array<FileInfo> *fi) { +struct MemoryMappedFile { + void *handle; + + void *data; + i32 size; +}; +enum MemoryMappedFileError { + MemoryMappedFile_None, + + MemoryMappedFile_Empty, + MemoryMappedFile_FileTooLarge, + MemoryMappedFile_Invalid, + MemoryMappedFile_NotExists, + MemoryMappedFile_Permission, + + MemoryMappedFile_COUNT, +}; + +MemoryMappedFileError memory_map_file_32(char const *fullpath, MemoryMappedFile *memory_mapped_file) { + MemoryMappedFileError err = MemoryMappedFile_None; + +#if defined(GB_SYSTEM_WINDOWS) + isize w_len = 0; + wchar_t *w_str = gb__alloc_utf8_to_ucs2(temporary_allocator(), fullpath, &w_len); + if (w_str == nullptr) { + return MemoryMappedFile_Invalid; + } + i64 file_size = 0; + LARGE_INTEGER li_file_size = {}; + HANDLE handle = nullptr; + HANDLE file_mapping = nullptr; + void *file_data = nullptr; + + handle = CreateFileW(w_str, GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL); + if (handle == INVALID_HANDLE_VALUE) { + handle = nullptr; + goto window_handle_file_error; + } + + li_file_size = {}; + if (!GetFileSizeEx(handle, &li_file_size)) { + goto window_handle_file_error; + } + file_size = cast(i64)li_file_size.QuadPart; + if (file_size > I32_MAX) { + CloseHandle(handle); + return MemoryMappedFile_FileTooLarge; + } + + if (file_size == 0) { + CloseHandle(handle); + err = MemoryMappedFile_Empty; + memory_mapped_file->handle = nullptr; + memory_mapped_file->data = nullptr; + memory_mapped_file->size = 0; + return err; + } + + file_mapping = CreateFileMappingW(handle, nullptr, PAGE_READONLY, 0, 0, nullptr); + CloseHandle(handle); + + file_data = MapViewOfFileEx(file_mapping, FILE_MAP_READ, 0, 0, 0/*file_size*/, nullptr/*base address*/); + memory_mapped_file->handle = cast(void *)file_mapping; + memory_mapped_file->data = file_data; + memory_mapped_file->size = cast(i32)file_size; + return err; + +window_handle_file_error:; + { + DWORD handle_err = GetLastError(); + CloseHandle(handle); + err = MemoryMappedFile_Invalid; + switch (handle_err) { + case ERROR_FILE_NOT_FOUND: + case ERROR_PATH_NOT_FOUND: + case ERROR_INVALID_DRIVE: + err = MemoryMappedFile_NotExists; + break; + case ERROR_ACCESS_DENIED: + case ERROR_INVALID_ACCESS: + err = MemoryMappedFile_Permission; + break; + } + return err; + } + +#else + // TODO(bill): Memory map rather than copy contents + gbFileContents fc = gb_file_read_contents(heap_allocator(), true, fullpath); + + if (fc.size > I32_MAX) { + err = MemoryMappedFile_FileTooLarge; + gb_file_free_contents(&fc); + } else if (fc.data != nullptr) { + memory_mapped_file->handle = nullptr; + memory_mapped_file->data = fc.data; + memory_mapped_file->size = cast(i32)fc.size; + } else { + gbFile f = {}; + gbFileError file_err = gb_file_open(&f, fullpath); + defer (gb_file_close(&f)); + + switch (file_err) { + case gbFileError_Invalid: err = MemoryMappedFile_Invalid; break; + case gbFileError_NotExists: err = MemoryMappedFile_NotExists; break; + case gbFileError_Permission: err = MemoryMappedFile_Permission; break; + } + + if (err == MemoryMappedFile_None && gb_file_size(&f) == 0) { + err = MemoryMappedFile_Empty; + } + } + return err; +#endif +} + + + + + + #define USE_DAMERAU_LEVENSHTEIN 1 isize levenstein_distance_case_insensitive(String const &a, String const &b) { |