mirror of
https://github.com/mhx/dwarfs.git
synced 2025-09-08 11:59:48 -04:00
refactor: split xattr implementation to avoid #ifdef hell
This commit is contained in:
parent
aa000939a6
commit
a4bd54c04f
@ -515,6 +515,12 @@ list(APPEND LIBDWARFS_SRC
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src/dwarfs/xattr.cpp
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)
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if(WIN32)
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list(APPEND LIBDWARFS_SRC src/dwarfs/xattr_win.cpp)
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else()
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list(APPEND LIBDWARFS_SRC src/dwarfs/xattr_posix.cpp)
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endif()
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if(WITH_MAN_OPTION)
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include(${CMAKE_SOURCE_DIR}/cmake/render_manpage.cmake)
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@ -19,369 +19,10 @@
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* along with dwarfs. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifdef _WIN32
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#include <vector>
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#include <ntstatus.h>
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#include <tchar.h>
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#include <windows.h>
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#include <winternl.h>
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#include <boost/algorithm/string.hpp>
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#else
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#include <sys/xattr.h>
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#endif
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#include <folly/ScopeGuard.h>
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#include <folly/String.h>
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#include <fmt/format.h>
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#include "dwarfs/xattr.h"
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#ifdef _WIN32
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extern "C" {
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typedef struct _FILE_FULL_EA_INFORMATION {
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ULONG NextEntryOffset;
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UCHAR Flags;
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UCHAR EaNameLength;
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USHORT EaValueLength;
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CHAR EaName[1];
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} FILE_FULL_EA_INFORMATION, *PFILE_FULL_EA_INFORMATION;
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typedef struct _FILE_GET_EA_INFORMATION {
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ULONG NextEntryOffset;
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UCHAR EaNameLength;
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CHAR EaName[1];
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} FILE_GET_EA_INFORMATION, *PFILE_GET_EA_INFORMATION;
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NTSYSAPI NTSTATUS NTAPI RtlDosPathNameToNtPathName_U_WithStatus(
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PCWSTR DosFileName, PUNICODE_STRING NtFileName, PWSTR* FilePart,
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PVOID RelativeName);
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VOID NTAPI RtlFreeUnicodeString(PUNICODE_STRING UnicodeString);
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NTSYSAPI NTSTATUS NTAPI NtQueryEaFile(HANDLE FileHandle,
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PIO_STATUS_BLOCK IoStatusBlock,
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PVOID Buffer, ULONG Length,
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BOOLEAN ReturnSingleEntry, PVOID EaList,
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ULONG EaListLength, PULONG EaIndex,
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BOOLEAN RestartScan);
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NTSYSAPI NTSTATUS NTAPI NtSetEaFile(HANDLE FileHandle,
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PIO_STATUS_BLOCK IoStatusBlock,
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PVOID Buffer, ULONG Length);
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}
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#endif
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namespace dwarfs {
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namespace {
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#ifdef _WIN32
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constexpr size_t kMaxFullEaBufferSize{
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offsetof(FILE_FULL_EA_INFORMATION, EaName) + 256 + 65536};
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constexpr size_t kMaxGetEaBufferSize{offsetof(FILE_GET_EA_INFORMATION, EaName) +
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256};
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HANDLE open_file(std::filesystem::path const& path, bool writeable,
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std::error_code& ec) {
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UNICODE_STRING nt_path;
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if (auto r = ::RtlDosPathNameToNtPathName_U_WithStatus(
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path.wstring().c_str(), &nt_path, nullptr, nullptr);
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r != 0) {
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ec = std::error_code(r, std::system_category());
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return nullptr;
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}
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SCOPE_EXIT { ::RtlFreeUnicodeString(&nt_path); };
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HANDLE fh;
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IO_STATUS_BLOCK iosb;
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OBJECT_ATTRIBUTES attr;
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ACCESS_MASK desired_access = FILE_READ_EA;
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if (writeable) {
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desired_access |= FILE_WRITE_EA;
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}
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InitializeObjectAttributes(&attr, &nt_path, 0, nullptr, nullptr);
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if (auto r = ::NtCreateFile(
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&fh, desired_access, &attr, &iosb, nullptr, FILE_ATTRIBUTE_NORMAL,
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FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, FILE_OPEN, 0,
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nullptr, 0);
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r != 0) {
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ec = std::error_code(::RtlNtStatusToDosError(r), std::system_category());
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return nullptr;
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}
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return fh;
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}
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#else
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ssize_t portable_getxattr(const char* path, const char* name, void* value,
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size_t size) {
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#ifdef __APPLE__
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return ::getxattr(path, name, value, size, 0, 0);
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#else
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return ::getxattr(path, name, value, size);
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#endif
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}
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int portable_setxattr(const char* path, const char* name, const void* value,
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size_t size, int flags) {
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#ifdef __APPLE__
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return ::setxattr(path, name, value, size, 0, flags);
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#else
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return ::setxattr(path, name, value, size, flags);
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#endif
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}
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int portable_removexattr(const char* path, const char* name) {
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#ifdef __APPLE__
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return ::removexattr(path, name, 0);
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#else
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return ::removexattr(path, name);
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#endif
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}
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ssize_t portable_listxattr(const char* path, char* list, size_t size) {
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#ifdef __APPLE__
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return ::listxattr(path, list, size, 0);
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#else
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return ::listxattr(path, list, size);
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#endif
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}
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#endif
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constexpr size_t kExtraSize{1024};
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} // namespace
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#ifdef _WIN32
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std::string getxattr(std::filesystem::path const& path, std::string const& name,
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std::error_code& ec) {
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ec.clear();
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if (name.size() > std::numeric_limits<UCHAR>::max()) {
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ec = std::error_code(ERROR_INVALID_EA_NAME, std::system_category());
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return {};
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}
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auto fh = open_file(path, false, ec);
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if (!fh) {
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// error code already set
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return {};
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}
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SCOPE_EXIT { ::NtClose(fh); };
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CHAR getea_buf[kMaxGetEaBufferSize];
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ULONG getea_len =
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FIELD_OFFSET(FILE_GET_EA_INFORMATION, EaName) + name.size() + 1;
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auto getea = reinterpret_cast<PFILE_GET_EA_INFORMATION>(getea_buf);
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getea->NextEntryOffset = 0;
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getea->EaNameLength = static_cast<UCHAR>(name.size());
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std::memcpy(getea->EaName, name.data(), name.size());
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getea->EaName[name.size()] = '\0';
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std::vector<CHAR> ea_buf(kMaxFullEaBufferSize);
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PFILE_FULL_EA_INFORMATION ea;
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IO_STATUS_BLOCK iosb;
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ea = reinterpret_cast<PFILE_FULL_EA_INFORMATION>(ea_buf.data());
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auto res = ::NtQueryEaFile(fh, &iosb, ea, ea_buf.size(), FALSE, getea,
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getea_len, nullptr, FALSE);
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if (res != STATUS_SUCCESS) {
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ec = std::error_code(::RtlNtStatusToDosError(res), std::system_category());
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return {};
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}
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if (ea->EaValueLength == 0) {
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ec = std::error_code(ENODATA, std::generic_category());
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return {};
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}
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return {ea->EaName + ea->EaNameLength + 1, ea->EaValueLength};
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}
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void setxattr(std::filesystem::path const& path, std::string const& name,
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std::string_view value, std::error_code& ec) {
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// TODO
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}
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void removexattr(std::filesystem::path const& path, std::string const& name,
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std::error_code& ec) {
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// TODO
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}
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std::vector<std::string>
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listxattr(std::filesystem::path const& path, std::error_code& ec) {
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ec.clear();
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auto fh = open_file(path, false, ec);
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if (!fh) {
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// error code already set
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return {};
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}
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SCOPE_EXIT { ::NtClose(fh); };
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std::vector<std::string> names;
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std::vector<CHAR> ea_buf(kMaxFullEaBufferSize);
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BOOLEAN restart = TRUE;
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for (;;) {
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IO_STATUS_BLOCK iosb;
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auto ea = reinterpret_cast<PFILE_FULL_EA_INFORMATION>(ea_buf.data());
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auto res = ::NtQueryEaFile(fh, &iosb, ea, ea_buf.size(), FALSE, nullptr, 0,
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nullptr, restart);
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if (res != STATUS_SUCCESS && res != STATUS_BUFFER_OVERFLOW) {
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ec =
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std::error_code(::RtlNtStatusToDosError(res), std::system_category());
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return {};
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}
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for (;;) {
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std::string name(ea->EaName, ea->EaNameLength);
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boost::algorithm::to_lower(name);
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names.push_back(std::move(name));
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if (ea->NextEntryOffset == 0) {
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break;
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}
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ea = reinterpret_cast<PFILE_FULL_EA_INFORMATION>(
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reinterpret_cast<PCHAR>(ea) + ea->NextEntryOffset);
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}
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if (res == STATUS_SUCCESS) {
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break;
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}
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restart = FALSE;
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}
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return names;
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}
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#else
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std::string getxattr(std::filesystem::path const& path, std::string const& name,
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std::error_code& ec) {
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ec.clear();
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auto cpath = path.c_str();
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auto cname = name.c_str();
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for (;;) {
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ssize_t size = portable_getxattr(cpath, cname, nullptr, 0);
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if (size < 0) {
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break;
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}
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std::string value;
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value.resize(size + kExtraSize);
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size = portable_getxattr(cpath, cname, value.data(), value.size());
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if (size >= 0) {
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value.resize(size);
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return value;
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}
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if (errno != ERANGE) {
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break;
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}
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}
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ec = std::error_code(errno, std::generic_category());
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return {};
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}
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void setxattr(std::filesystem::path const& path, std::string const& name,
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std::string_view value, std::error_code& ec) {
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ec.clear();
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if (portable_setxattr(path.c_str(), name.c_str(), value.data(), value.size(),
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0) < 0) {
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ec = std::error_code(errno, std::generic_category());
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}
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}
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void removexattr(std::filesystem::path const& path, std::string const& name,
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std::error_code& ec) {
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ec.clear();
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if (portable_removexattr(path.c_str(), name.c_str()) < 0) {
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ec = std::error_code(errno, std::generic_category());
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}
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}
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std::vector<std::string>
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listxattr(std::filesystem::path const& path, std::error_code& ec) {
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ec.clear();
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auto cpath = path.c_str();
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for (;;) {
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ssize_t size = portable_listxattr(cpath, nullptr, 0);
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if (size < 0) {
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break;
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}
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std::string list;
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list.resize(size + kExtraSize);
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size = portable_listxattr(cpath, list.data(), list.size());
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if (size >= 0) {
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std::vector<std::string> names;
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if (size > 0) {
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// drop the last '\0'
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list.resize(size - 1);
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folly::split('\0', list, names);
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}
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return names;
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}
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if (errno != ERANGE) {
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break;
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}
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}
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ec = std::error_code(errno, std::generic_category());
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return {};
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}
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#endif
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std::string
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getxattr(std::filesystem::path const& path, std::string const& name) {
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std::error_code ec;
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163
src/dwarfs/xattr_posix.cpp
Normal file
163
src/dwarfs/xattr_posix.cpp
Normal file
@ -0,0 +1,163 @@
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/* vim:set ts=2 sw=2 sts=2 et: */
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/**
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* \author Marcus Holland-Moritz (github@mhxnet.de)
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* \copyright Copyright (c) Marcus Holland-Moritz
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*
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* This file is part of dwarfs.
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*
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* dwarfs is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* dwarfs is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with dwarfs. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <sys/xattr.h>
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#include <folly/String.h>
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#include "dwarfs/xattr.h"
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namespace dwarfs {
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namespace {
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ssize_t portable_getxattr(const char* path, const char* name, void* value,
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size_t size) {
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#ifdef __APPLE__
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return ::getxattr(path, name, value, size, 0, 0);
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#else
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return ::getxattr(path, name, value, size);
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#endif
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}
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int portable_setxattr(const char* path, const char* name, const void* value,
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size_t size, int flags) {
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#ifdef __APPLE__
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return ::setxattr(path, name, value, size, 0, flags);
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#else
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return ::setxattr(path, name, value, size, flags);
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#endif
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}
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int portable_removexattr(const char* path, const char* name) {
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#ifdef __APPLE__
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return ::removexattr(path, name, 0);
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#else
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return ::removexattr(path, name);
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#endif
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}
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ssize_t portable_listxattr(const char* path, char* list, size_t size) {
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#ifdef __APPLE__
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return ::listxattr(path, list, size, 0);
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#else
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return ::listxattr(path, list, size);
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#endif
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}
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constexpr size_t kExtraSize{1024};
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} // namespace
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std::string getxattr(std::filesystem::path const& path, std::string const& name,
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std::error_code& ec) {
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ec.clear();
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auto cpath = path.c_str();
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auto cname = name.c_str();
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for (;;) {
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ssize_t size = portable_getxattr(cpath, cname, nullptr, 0);
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if (size < 0) {
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break;
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}
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std::string value;
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value.resize(size + kExtraSize);
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size = portable_getxattr(cpath, cname, value.data(), value.size());
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if (size >= 0) {
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value.resize(size);
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return value;
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}
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if (errno != ERANGE) {
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break;
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}
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}
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ec = std::error_code(errno, std::generic_category());
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return {};
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}
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void setxattr(std::filesystem::path const& path, std::string const& name,
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std::string_view value, std::error_code& ec) {
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ec.clear();
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if (portable_setxattr(path.c_str(), name.c_str(), value.data(), value.size(),
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0) < 0) {
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ec = std::error_code(errno, std::generic_category());
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}
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}
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void removexattr(std::filesystem::path const& path, std::string const& name,
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std::error_code& ec) {
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ec.clear();
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if (portable_removexattr(path.c_str(), name.c_str()) < 0) {
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ec = std::error_code(errno, std::generic_category());
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}
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}
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std::vector<std::string>
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listxattr(std::filesystem::path const& path, std::error_code& ec) {
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ec.clear();
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auto cpath = path.c_str();
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for (;;) {
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ssize_t size = portable_listxattr(cpath, nullptr, 0);
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if (size < 0) {
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break;
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}
|
||||
|
||||
std::string list;
|
||||
list.resize(size + kExtraSize);
|
||||
|
||||
size = portable_listxattr(cpath, list.data(), list.size());
|
||||
|
||||
if (size >= 0) {
|
||||
std::vector<std::string> names;
|
||||
|
||||
if (size > 0) {
|
||||
// drop the last '\0'
|
||||
list.resize(size - 1);
|
||||
folly::split('\0', list, names);
|
||||
}
|
||||
|
||||
return names;
|
||||
}
|
||||
|
||||
if (errno != ERANGE) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
ec = std::error_code(errno, std::generic_category());
|
||||
|
||||
return {};
|
||||
}
|
||||
|
||||
} // namespace dwarfs
|
229
src/dwarfs/xattr_win.cpp
Normal file
229
src/dwarfs/xattr_win.cpp
Normal file
@ -0,0 +1,229 @@
|
||||
/* vim:set ts=2 sw=2 sts=2 et: */
|
||||
/**
|
||||
* \author Marcus Holland-Moritz (github@mhxnet.de)
|
||||
* \copyright Copyright (c) Marcus Holland-Moritz
|
||||
*
|
||||
* This file is part of dwarfs.
|
||||
*
|
||||
* dwarfs is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation, either version 3 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* dwarfs is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with dwarfs. If not, see <https://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#include <vector>
|
||||
|
||||
#include <ntstatus.h>
|
||||
#include <tchar.h>
|
||||
#include <windows.h>
|
||||
#include <winternl.h>
|
||||
|
||||
#include <boost/algorithm/string.hpp>
|
||||
|
||||
#include <folly/ScopeGuard.h>
|
||||
|
||||
#include "dwarfs/xattr.h"
|
||||
|
||||
extern "C" {
|
||||
|
||||
typedef struct _FILE_FULL_EA_INFORMATION {
|
||||
ULONG NextEntryOffset;
|
||||
UCHAR Flags;
|
||||
UCHAR EaNameLength;
|
||||
USHORT EaValueLength;
|
||||
CHAR EaName[1];
|
||||
} FILE_FULL_EA_INFORMATION, *PFILE_FULL_EA_INFORMATION;
|
||||
|
||||
typedef struct _FILE_GET_EA_INFORMATION {
|
||||
ULONG NextEntryOffset;
|
||||
UCHAR EaNameLength;
|
||||
CHAR EaName[1];
|
||||
} FILE_GET_EA_INFORMATION, *PFILE_GET_EA_INFORMATION;
|
||||
|
||||
NTSYSAPI NTSTATUS NTAPI RtlDosPathNameToNtPathName_U_WithStatus(
|
||||
PCWSTR DosFileName, PUNICODE_STRING NtFileName, PWSTR* FilePart,
|
||||
PVOID RelativeName);
|
||||
|
||||
VOID NTAPI RtlFreeUnicodeString(PUNICODE_STRING UnicodeString);
|
||||
|
||||
NTSYSAPI NTSTATUS NTAPI NtQueryEaFile(HANDLE FileHandle,
|
||||
PIO_STATUS_BLOCK IoStatusBlock,
|
||||
PVOID Buffer, ULONG Length,
|
||||
BOOLEAN ReturnSingleEntry, PVOID EaList,
|
||||
ULONG EaListLength, PULONG EaIndex,
|
||||
BOOLEAN RestartScan);
|
||||
|
||||
NTSYSAPI NTSTATUS NTAPI NtSetEaFile(HANDLE FileHandle,
|
||||
PIO_STATUS_BLOCK IoStatusBlock,
|
||||
PVOID Buffer, ULONG Length);
|
||||
}
|
||||
|
||||
namespace dwarfs {
|
||||
|
||||
namespace {
|
||||
|
||||
constexpr size_t kMaxFullEaBufferSize{
|
||||
offsetof(FILE_FULL_EA_INFORMATION, EaName) + 256 + 65536};
|
||||
constexpr size_t kMaxGetEaBufferSize{offsetof(FILE_GET_EA_INFORMATION, EaName) +
|
||||
256};
|
||||
|
||||
HANDLE open_file(std::filesystem::path const& path, bool writeable,
|
||||
std::error_code& ec) {
|
||||
UNICODE_STRING nt_path;
|
||||
|
||||
if (auto r = ::RtlDosPathNameToNtPathName_U_WithStatus(
|
||||
path.wstring().c_str(), &nt_path, nullptr, nullptr);
|
||||
r != 0) {
|
||||
ec = std::error_code(r, std::system_category());
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
SCOPE_EXIT { ::RtlFreeUnicodeString(&nt_path); };
|
||||
|
||||
HANDLE fh;
|
||||
IO_STATUS_BLOCK iosb;
|
||||
OBJECT_ATTRIBUTES attr;
|
||||
ACCESS_MASK desired_access = FILE_READ_EA;
|
||||
|
||||
if (writeable) {
|
||||
desired_access |= FILE_WRITE_EA;
|
||||
}
|
||||
|
||||
InitializeObjectAttributes(&attr, &nt_path, 0, nullptr, nullptr);
|
||||
|
||||
if (auto r = ::NtCreateFile(
|
||||
&fh, desired_access, &attr, &iosb, nullptr, FILE_ATTRIBUTE_NORMAL,
|
||||
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, FILE_OPEN, 0,
|
||||
nullptr, 0);
|
||||
r != 0) {
|
||||
ec = std::error_code(::RtlNtStatusToDosError(r), std::system_category());
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
return fh;
|
||||
}
|
||||
|
||||
} // namespace
|
||||
|
||||
std::string getxattr(std::filesystem::path const& path, std::string const& name,
|
||||
std::error_code& ec) {
|
||||
ec.clear();
|
||||
|
||||
if (name.size() > std::numeric_limits<UCHAR>::max()) {
|
||||
ec = std::error_code(ERROR_INVALID_EA_NAME, std::system_category());
|
||||
return {};
|
||||
}
|
||||
|
||||
auto fh = open_file(path, false, ec);
|
||||
|
||||
if (!fh) {
|
||||
// error code already set
|
||||
return {};
|
||||
}
|
||||
|
||||
SCOPE_EXIT { ::NtClose(fh); };
|
||||
|
||||
CHAR getea_buf[kMaxGetEaBufferSize];
|
||||
ULONG getea_len =
|
||||
FIELD_OFFSET(FILE_GET_EA_INFORMATION, EaName) + name.size() + 1;
|
||||
auto getea = reinterpret_cast<PFILE_GET_EA_INFORMATION>(getea_buf);
|
||||
|
||||
getea->NextEntryOffset = 0;
|
||||
getea->EaNameLength = static_cast<UCHAR>(name.size());
|
||||
std::memcpy(getea->EaName, name.data(), name.size());
|
||||
getea->EaName[name.size()] = '\0';
|
||||
|
||||
std::vector<CHAR> ea_buf(kMaxFullEaBufferSize);
|
||||
PFILE_FULL_EA_INFORMATION ea;
|
||||
IO_STATUS_BLOCK iosb;
|
||||
|
||||
ea = reinterpret_cast<PFILE_FULL_EA_INFORMATION>(ea_buf.data());
|
||||
|
||||
auto res = ::NtQueryEaFile(fh, &iosb, ea, ea_buf.size(), FALSE, getea,
|
||||
getea_len, nullptr, FALSE);
|
||||
|
||||
if (res != STATUS_SUCCESS) {
|
||||
ec = std::error_code(::RtlNtStatusToDosError(res), std::system_category());
|
||||
return {};
|
||||
}
|
||||
|
||||
if (ea->EaValueLength == 0) {
|
||||
ec = std::error_code(ENODATA, std::generic_category());
|
||||
return {};
|
||||
}
|
||||
|
||||
return {ea->EaName + ea->EaNameLength + 1, ea->EaValueLength};
|
||||
}
|
||||
|
||||
void setxattr(std::filesystem::path const& path, std::string const& name,
|
||||
std::string_view value, std::error_code& ec) {
|
||||
// TODO
|
||||
}
|
||||
|
||||
void removexattr(std::filesystem::path const& path, std::string const& name,
|
||||
std::error_code& ec) {
|
||||
// TODO
|
||||
}
|
||||
|
||||
std::vector<std::string>
|
||||
listxattr(std::filesystem::path const& path, std::error_code& ec) {
|
||||
ec.clear();
|
||||
|
||||
auto fh = open_file(path, false, ec);
|
||||
|
||||
if (!fh) {
|
||||
// error code already set
|
||||
return {};
|
||||
}
|
||||
|
||||
SCOPE_EXIT { ::NtClose(fh); };
|
||||
|
||||
std::vector<std::string> names;
|
||||
std::vector<CHAR> ea_buf(kMaxFullEaBufferSize);
|
||||
BOOLEAN restart = TRUE;
|
||||
|
||||
for (;;) {
|
||||
IO_STATUS_BLOCK iosb;
|
||||
|
||||
auto ea = reinterpret_cast<PFILE_FULL_EA_INFORMATION>(ea_buf.data());
|
||||
auto res = ::NtQueryEaFile(fh, &iosb, ea, ea_buf.size(), FALSE, nullptr, 0,
|
||||
nullptr, restart);
|
||||
|
||||
if (res != STATUS_SUCCESS && res != STATUS_BUFFER_OVERFLOW) {
|
||||
ec =
|
||||
std::error_code(::RtlNtStatusToDosError(res), std::system_category());
|
||||
return {};
|
||||
}
|
||||
|
||||
for (;;) {
|
||||
std::string name(ea->EaName, ea->EaNameLength);
|
||||
boost::algorithm::to_lower(name);
|
||||
names.push_back(std::move(name));
|
||||
|
||||
if (ea->NextEntryOffset == 0) {
|
||||
break;
|
||||
}
|
||||
|
||||
ea = reinterpret_cast<PFILE_FULL_EA_INFORMATION>(
|
||||
reinterpret_cast<PCHAR>(ea) + ea->NextEntryOffset);
|
||||
}
|
||||
|
||||
if (res == STATUS_SUCCESS) {
|
||||
break;
|
||||
}
|
||||
|
||||
restart = FALSE;
|
||||
}
|
||||
|
||||
return names;
|
||||
}
|
||||
|
||||
} // namespace dwarfs
|
Loading…
x
Reference in New Issue
Block a user