/*
- * win32_common.c - Windows code common to applying and capturing images, as
- * well as replacements for various functions not available on Windows, such as
- * fsync().
+ * win32_common.c - Windows code common to applying and capturing images.
*/
/*
#ifdef __WIN32__
-#include <shlwapi.h> /* for PathMatchSpecW() */
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
#include <errno.h>
-#include "win32_common.h"
+#include "wimlib/win32_common.h"
+
+#include "wimlib/assert.h"
+#include "wimlib/error.h"
+#include "wimlib/util.h"
#ifdef ENABLE_ERROR_MESSAGES
void
}
void
-set_errno_from_GetLastError()
+set_errno_from_GetLastError(void)
{
errno = win32_error_to_errno(GetLastError());
}
-/* Replacement for POSIX fsync() */
-int
-fsync(int fd)
-{
- HANDLE h;
-
- h = (HANDLE)_get_osfhandle(fd);
- if (h == INVALID_HANDLE_VALUE)
- goto err;
- if (!FlushFileBuffers(h))
- goto err_set_errno;
- return 0;
-err_set_errno:
- set_errno_from_GetLastError();
-err:
- return -1;
-}
-
-/* Use the Win32 API to get the number of processors */
-unsigned
-win32_get_number_of_processors()
+/* Given a Windows-style path, return the number of characters of the prefix
+ * that specify the path to the root directory of a drive, or return 0 if the
+ * drive is relative (or at least on the current drive, in the case of
+ * absolute-but-not-really-absolute paths like \Windows\System32) */
+static size_t
+win32_path_drive_spec_len(const wchar_t *path)
{
- SYSTEM_INFO sysinfo;
- GetSystemInfo(&sysinfo);
- return sysinfo.dwNumberOfProcessors;
-}
-
-/* Replacement for POSIX-2008 realpath(). Warning: partial functionality only
- * (resolved_path must be NULL). Also I highly doubt that GetFullPathName
- * really does the right thing under all circumstances. */
-wchar_t *
-realpath(const wchar_t *path, wchar_t *resolved_path)
-{
- DWORD ret;
- DWORD err;
- wimlib_assert(resolved_path == NULL);
-
- ret = GetFullPathNameW(path, 0, NULL, NULL);
- if (!ret) {
- err = GetLastError();
- goto fail_win32;
- }
-
- resolved_path = TMALLOC(ret);
- if (!resolved_path)
- goto out;
- ret = GetFullPathNameW(path, ret, resolved_path, NULL);
- if (!ret) {
- err = GetLastError();
- free(resolved_path);
- resolved_path = NULL;
- goto fail_win32;
- }
- goto out;
-fail_win32:
- errno = win32_error_to_errno(err);
-out:
- return resolved_path;
-}
-
-/* rename() on Windows fails if the destination file exists. And we need to
- * make it work on wide characters. Fix it. */
-int
-win32_rename_replacement(const wchar_t *oldpath, const wchar_t *newpath)
-{
- if (MoveFileExW(oldpath, newpath, MOVEFILE_REPLACE_EXISTING)) {
- return 0;
+ size_t n = 0;
+
+ if (!wcsncmp(path, L"\\\\?\\", 4)) {
+ /* \\?\-prefixed path. Check for following drive letter and
+ * path separator. */
+ if (path[4] != L'\0' && path[5] == L':' &&
+ is_any_path_separator(path[6]))
+ n = 7;
} else {
- set_errno_from_GetLastError();
- return -1;
+ /* Not a \\?\-prefixed path. Check for an initial drive letter
+ * and path separator. */
+ if (path[0] != L'\0' && path[1] == L':' &&
+ is_any_path_separator(path[2]))
+ n = 3;
}
+ /* Include any additional path separators.*/
+ if (n > 0)
+ while (is_any_path_separator(path[n]))
+ n++;
+ return n;
}
-/* Replacement for POSIX fnmatch() (partial functionality only) */
-int
-fnmatch(const wchar_t *pattern, const wchar_t *string, int flags)
-{
- if (PathMatchSpecW(string, pattern))
- return 0;
- else
- return FNM_NOMATCH;
-}
-
-/* truncate() replacement */
-int
-win32_truncate_replacement(const wchar_t *path, off_t size)
-{
- DWORD err = NO_ERROR;
- LARGE_INTEGER liOffset;
-
- HANDLE h = win32_open_existing_file(path, GENERIC_WRITE);
- if (h == INVALID_HANDLE_VALUE)
- goto fail;
-
- liOffset.QuadPart = size;
- if (!SetFilePointerEx(h, liOffset, NULL, FILE_BEGIN))
- goto fail_close_handle;
-
- if (!SetEndOfFile(h))
- goto fail_close_handle;
- CloseHandle(h);
- return 0;
-
-fail_close_handle:
- err = GetLastError();
- CloseHandle(h);
-fail:
- if (err == NO_ERROR)
- err = GetLastError();
- errno = win32_error_to_errno(err);
- return -1;
-}
-
-
-/* This really could be replaced with _wcserror_s, but this doesn't seem to
- * actually be available in MSVCRT.DLL on Windows XP (perhaps it's statically
- * linked in by Visual Studio...?). */
-extern int
-win32_strerror_r_replacement(int errnum, wchar_t *buf, size_t buflen)
+bool
+win32_path_is_root_of_drive(const wchar_t *path)
{
- static pthread_mutex_t strerror_lock = PTHREAD_MUTEX_INITIALIZER;
-
- pthread_mutex_lock(&strerror_lock);
- mbstowcs(buf, strerror(errnum), buflen);
- buf[buflen - 1] = '\0';
- pthread_mutex_unlock(&strerror_lock);
- return 0;
+ size_t drive_spec_len;
+
+ /* Explicit drive letter and path separator? */
+ drive_spec_len = win32_path_drive_spec_len(path);
+ if (drive_spec_len > 0 && path[drive_spec_len] == L'\0')
+ return true;
+
+ /* All path separators? */
+ for (const wchar_t *p = path; *p != L'\0'; p++)
+ if (!is_any_path_separator(*p))
+ return false;
+ return true;
+
+ /* XXX This function does not handle paths like "c:" where the working
+ * directory on "c:" is actually "c:\", or weird paths like "\.". But
+ * currently the capture and apply code always prefixes the paths with
+ * \\?\ anyway so this is irrelevant... */
}
-static int
-do_pread_or_pwrite(int fd, void *buf, size_t count, off_t offset,
- bool is_pwrite)
-{
- HANDLE h;
- LARGE_INTEGER orig_offset;
- DWORD bytes_read_or_written;
- LARGE_INTEGER relative_offset;
- OVERLAPPED overlapped;
- BOOL bret;
-
- wimlib_assert(count <= 0xffffffff);
-
- h = (HANDLE)_get_osfhandle(fd);
- if (h == INVALID_HANDLE_VALUE)
- goto err;
-
- /* Get original position */
- relative_offset.QuadPart = 0;
- if (!SetFilePointerEx(h, relative_offset, &orig_offset, FILE_CURRENT))
- goto err_set_errno;
-
- memset(&overlapped, 0, sizeof(overlapped));
- overlapped.Offset = offset;
- overlapped.OffsetHigh = offset >> 32;
-
- /* Do the read or write at the specified offset */
- if (is_pwrite)
- bret = WriteFile(h, buf, count, &bytes_read_or_written, &overlapped);
- else
- bret = ReadFile(h, buf, count, &bytes_read_or_written, &overlapped);
- if (!bret)
- goto err_set_errno;
-
- /* Restore the original position */
- if (!SetFilePointerEx(h, orig_offset, NULL, FILE_BEGIN))
- goto err_set_errno;
-
- return bytes_read_or_written;
-err_set_errno:
- set_errno_from_GetLastError();
-err:
- return -1;
-}
-
-/* Dumb Windows implementation of pread(). It temporarily changes the file
- * offset, so it is not safe to use with readers/writers on the same file
- * descriptor. */
-extern ssize_t
-win32_pread(int fd, void *buf, size_t count, off_t offset)
-{
- return do_pread_or_pwrite(fd, buf, count, offset, false);
-}
-
-/* Dumb Windows implementation of pwrite(). It temporarily changes the file
- * offset, so it is not safe to use with readers/writers on the same file
- * descriptor. */
-extern ssize_t
-win32_pwrite(int fd, const void *buf, size_t count, off_t offset)
-{
- return do_pread_or_pwrite(fd, (void*)buf, count, offset, true);
-}
-
-/* Dumb Windows implementation of writev(). It writes the vectors one at a
- * time. */
-extern ssize_t
-win32_writev(int fd, const struct iovec *iov, int iovcnt)
-{
- ssize_t total_bytes_written = 0;
-
- if (iovcnt <= 0) {
- errno = EINVAL;
- return -1;
- }
- for (int i = 0; i < iovcnt; i++) {
- ssize_t bytes_written;
-
- bytes_written = write(fd, iov[i].iov_base, iov[i].iov_len);
- if (bytes_written >= 0)
- total_bytes_written += bytes_written;
- if (bytes_written != iov[i].iov_len) {
- if (total_bytes_written == 0)
- total_bytes_written = -1;
- break;
- }
- }
- return total_bytes_written;
-}
/* Given a path, which may not yet exist, get a set of flags that describe the
* features of the volume the path is on. */
wchar_t *volume;
BOOL bret;
DWORD vol_flags;
+ size_t drive_spec_len;
- if (path[0] != L'\0' && path[0] != L'\\' &&
- path[0] != L'/' && path[1] == L':')
- {
- /* Path starts with a drive letter; use it. */
- volume = alloca(4 * sizeof(wchar_t));
- volume[0] = path[0];
- volume[1] = path[1];
- volume[2] = L'\\';
- volume[3] = L'\0';
- } else {
+ drive_spec_len = win32_path_drive_spec_len(path);
+
+ if (drive_spec_len == 0)
+ if (path[0] != L'\0' && path[1] == L':') /* Drive-relative path? */
+ drive_spec_len = 2;
+
+ if (drive_spec_len == 0) {
/* Path does not start with a drive letter; use the volume of
* the current working directory. */
volume = NULL;
+ } else {
+ /* Path starts with a drive letter (or \\?\ followed by a drive
+ * letter); use it. */
+ volume = alloca((drive_spec_len + 2) * sizeof(wchar_t));
+ wmemcpy(volume, path, drive_spec_len);
+ /* Add trailing backslash in case this was a drive-relative
+ * path. */
+ volume[drive_spec_len] = L'\\';
+ volume[drive_spec_len + 1] = L'\0';
}
bret = GetVolumeInformationW(volume, /* lpRootPathName */
NULL, /* lpVolumeNameBuffer */
BOOL (WINAPI *win32func_FindNextStreamW)(HANDLE hFindStream,
LPVOID lpFindStreamData) = NULL;
+static OSVERSIONINFO windows_version_info = {
+ .dwOSVersionInfoSize = sizeof(OSVERSIONINFO),
+};
+
static HMODULE hKernel32 = NULL;
+bool
+windows_version_is_at_least(unsigned major, unsigned minor)
+{
+ return windows_version_info.dwMajorVersion > major ||
+ (windows_version_info.dwMajorVersion == major &&
+ windows_version_info.dwMinorVersion >= minor);
+}
+
/* Try to dynamically load some functions */
void
-win32_global_init()
+win32_global_init(void)
{
DWORD err;
err = GetLastError();
WARNING("Can't load Kernel32.dll");
win32_error(err);
- return;
}
}
- DEBUG("Looking for FindFirstStreamW");
- win32func_FindFirstStreamW = (void*)GetProcAddress(hKernel32, "FindFirstStreamW");
- if (!win32func_FindFirstStreamW) {
- WARNING("Could not find function FindFirstStreamW() in Kernel32.dll!");
- WARNING("Capturing alternate data streams will not be supported.");
- return;
+ if (hKernel32) {
+ win32func_FindFirstStreamW = (void*)GetProcAddress(hKernel32,
+ "FindFirstStreamW");
+ if (win32func_FindFirstStreamW) {
+ win32func_FindNextStreamW = (void*)GetProcAddress(hKernel32,
+ "FindNextStreamW");
+ if (!win32func_FindNextStreamW)
+ win32func_FindFirstStreamW = NULL;
+ }
}
- DEBUG("Looking for FindNextStreamW");
- win32func_FindNextStreamW = (void*)GetProcAddress(hKernel32, "FindNextStreamW");
- if (!win32func_FindNextStreamW) {
- WARNING("Could not find function FindNextStreamW() in Kernel32.dll!");
- WARNING("Capturing alternate data streams will not be supported.");
- win32func_FindFirstStreamW = NULL;
- }
+ GetVersionEx(&windows_version_info);
}
void
-win32_global_cleanup()
+win32_global_cleanup(void)
{
if (hKernel32 != NULL) {
DEBUG("Closing Kernel32.dll");
git://wimlib.net / wimlib / blobdiff