spacemonger/DiskUsage.cpp at master · Daduck/spacemonger · GitHub

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#include "DiskUsage.h"

// Fallbacks for older Windows SDKs that might be used on CI runners
#ifndef FILE_ATTRIBUTE_RECALL_ON_OPEN
#define FILE_ATTRIBUTE_RECALL_ON_OPEN 0x00040000
#endif
#ifndef FILE_ATTRIBUTE_RECALL_ON_DATA_ACCESS
#define FILE_ATTRIBUTE_RECALL_ON_DATA_ACCESS 0x00400000
#endif
#ifndef FILE_ATTRIBUTE_UNPINNED
#define FILE_ATTRIBUTE_UNPINNED 0x00100000
#endif

SM_UINT64 SM_MakeFileSize(DWORD low, DWORD high)
{
	return (SM_UINT64)low + ((SM_UINT64)high << 32);
}

SM_UINT64 SM_GetLogicalFileSize(const SM_FILE_SIZE_INFO *info)
{
	return info->logical_size;
}

static int SM_IsCloudPlaceholder(DWORD attributes)
{
	DWORD flags =
		FILE_ATTRIBUTE_OFFLINE |
		FILE_ATTRIBUTE_RECALL_ON_OPEN |
		FILE_ATTRIBUTE_RECALL_ON_DATA_ACCESS |
		FILE_ATTRIBUTE_UNPINNED;

	return (attributes & flags) != 0;
}

int SM_ShouldLoadAllocatedSize(DWORD attributes)
{
	DWORD flags =
		FILE_ATTRIBUTE_COMPRESSED |
		FILE_ATTRIBUTE_REPARSE_POINT |
		FILE_ATTRIBUTE_SPARSE_FILE;

	return !SM_IsCloudPlaceholder(attributes) && (attributes & flags) != 0;
}

static SM_UINT64 SM_LegacyClusterSize(SM_UINT64 logical_size, SM_UINT64 cluster_mask, int aligned)
{
	SM_UINT64 cluster_size = cluster_mask + 1;
	if (logical_size == 0 || cluster_size == 0)
		return logical_size;

	if (logical_size > ((SM_UINT64)-1) - cluster_mask)
		return logical_size;

	if (aligned)
		return (logical_size + cluster_mask) & ~cluster_mask;

	return ((logical_size + cluster_mask) / cluster_size) * cluster_size;
}

SM_UINT64 SM_ChooseDisplayedFileSize(const SM_FILE_SIZE_INFO *info, SM_UINT64 cluster_mask, int aligned)
{
	if (SM_IsCloudPlaceholder(info->attributes))
		return 0;

	if (info->has_allocated_size && SM_ShouldLoadAllocatedSize(info->attributes))
		return info->allocated_size;

	return SM_LegacyClusterSize(info->logical_size, cluster_mask, aligned);
}

typedef DWORD (WINAPI *SM_GetCompressedFileSizeWFunc)(LPCWSTR filename, LPDWORD high_size);

static SM_GetCompressedFileSizeWFunc SM_GetCompressedFileSizeWProc(void)
{
	static const SM_GetCompressedFileSizeWFunc get_compressed_size = []() {
		HMODULE kernel = GetModuleHandleW(L"KERNEL32.DLL");
		return kernel == NULL ? nullptr
			: reinterpret_cast<SM_GetCompressedFileSizeWFunc>(GetProcAddress(kernel, "GetCompressedFileSizeW"));
	}();

	return get_compressed_size;
}

int SM_LoadFileSizeInfoW(const wchar_t *path, const WIN32_FIND_DATAW *finddata, SM_FILE_SIZE_INFO *info)
{
	DWORD high_size = 0;
	DWORD low_size;
	SM_GetCompressedFileSizeWFunc get_compressed_size;

	if (path == NULL || finddata == NULL || info == NULL)
		return 0;

	info->logical_size = SM_MakeFileSize(finddata->nFileSizeLow, finddata->nFileSizeHigh);
	info->allocated_size = 0;
	info->attributes = finddata->dwFileAttributes;
	info->has_allocated_size = 0;

	if (SM_IsCloudPlaceholder(info->attributes)) {
		info->allocated_size = 0;
		info->has_allocated_size = 1;
		return 1;
	}

	if (!SM_ShouldLoadAllocatedSize(info->attributes))
		return 1;

	get_compressed_size = SM_GetCompressedFileSizeWProc();
	if (get_compressed_size == NULL)
		return 1;

	SetLastError(ERROR_SUCCESS);
	low_size = get_compressed_size(path, &high_size);
	if (low_size != 0xFFFFFFFFUL || GetLastError() == ERROR_SUCCESS) {
		info->allocated_size = SM_MakeFileSize(low_size, high_size);
		info->has_allocated_size = 1;
	}

	return 1;
}