Qt/QML edition

dependencies/libarchive-3.4.2/libarchive/archive_windows.c

@@ -0,0 +1,909 @@
+/*-
+ * Copyright (c) 2009-2011 Michihiro NAKAJIMA
+ * Copyright (c) 2003-2007 Kees Zeelenberg
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * A set of compatibility glue for building libarchive on Windows platforms.
+ *
+ * Originally created as "libarchive-nonposix.c" by Kees Zeelenberg
+ * for the GnuWin32 project, trimmed significantly by Tim Kientzle.
+ *
+ * Much of the original file was unnecessary for libarchive, because
+ * many of the features it emulated were not strictly necessary for
+ * libarchive.  I hope for this to shrink further as libarchive
+ * internals are gradually reworked to sit more naturally on both
+ * POSIX and Windows.  Any ideas for this are greatly appreciated.
+ *
+ * The biggest remaining issue is the dev/ino emulation; libarchive
+ * has a couple of public APIs that rely on dev/ino uniquely
+ * identifying a file.  This doesn't match well with Windows.  I'm
+ * considering alternative APIs.
+ */
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+
+#include "archive_platform.h"
+#include "archive_private.h"
+#include "archive_entry.h"
+#include <ctype.h>
+#include <errno.h>
+#include <stddef.h>
+#ifdef HAVE_SYS_UTIME_H
+#include <sys/utime.h>
+#endif
+#include <sys/stat.h>
+#include <locale.h>
+#include <process.h>
+#include <stdlib.h>
+#include <wchar.h>
+#include <windows.h>
+#include <share.h>
+
+#define EPOC_TIME ARCHIVE_LITERAL_ULL(116444736000000000)
+
+#if defined(__LA_LSEEK_NEEDED)
+static BOOL SetFilePointerEx_perso(HANDLE hFile,
+				   LARGE_INTEGER liDistanceToMove,
+				   PLARGE_INTEGER lpNewFilePointer,
+				   DWORD dwMoveMethod)
+{
+	LARGE_INTEGER li;
+	li.QuadPart = liDistanceToMove.QuadPart;
+	li.LowPart = SetFilePointer(
+		hFile, li.LowPart, &li.HighPart, dwMoveMethod);
+	if(lpNewFilePointer) {
+		lpNewFilePointer->QuadPart = li.QuadPart;
+	}
+	return li.LowPart != -1 || GetLastError() == NO_ERROR;
+}
+#endif
+
+struct ustat {
+	int64_t		st_atime;
+	uint32_t	st_atime_nsec;
+	int64_t		st_ctime;
+	uint32_t	st_ctime_nsec;
+	int64_t		st_mtime;
+	uint32_t	st_mtime_nsec;
+	gid_t		st_gid;
+	/* 64bits ino */
+	int64_t		st_ino;
+	mode_t		st_mode;
+	uint32_t	st_nlink;
+	uint64_t	st_size;
+	uid_t		st_uid;
+	dev_t		st_dev;
+	dev_t		st_rdev;
+};
+
+/* Transform 64-bits ino into 32-bits by hashing.
+ * You do not forget that really unique number size is 64-bits.
+ */
+#define INOSIZE (8*sizeof(ino_t)) /* 32 */
+static __inline ino_t
+getino(struct ustat *ub)
+{
+	ULARGE_INTEGER ino64;
+	ino64.QuadPart = ub->st_ino;
+	/* I don't know this hashing is correct way */
+	return ((ino_t)(ino64.LowPart ^ (ino64.LowPart >> INOSIZE)));
+}
+
+/*
+ * Prepend "\\?\" to the path name and convert it to unicode to permit
+ * an extended-length path for a maximum total path length of 32767
+ * characters.
+ * see also http://msdn.microsoft.com/en-us/library/aa365247.aspx
+ */
+wchar_t *
+__la_win_permissive_name(const char *name)
+{
+	wchar_t *wn;
+	wchar_t *ws;
+	size_t ll;
+
+	ll = strlen(name);
+	wn = malloc((ll + 1) * sizeof(wchar_t));
+	if (wn == NULL)
+		return (NULL);
+	ll = mbstowcs(wn, name, ll);
+	if (ll == (size_t)-1) {
+		free(wn);
+		return (NULL);
+	}
+	wn[ll] = L'\0';
+	ws = __la_win_permissive_name_w(wn);
+	free(wn);
+	return (ws);
+}
+
+wchar_t *
+__la_win_permissive_name_w(const wchar_t *wname)
+{
+	wchar_t *wn, *wnp;
+	wchar_t *ws, *wsp;
+	DWORD l, len, slen;
+	int unc;
+
+	/* Get a full-pathname. */
+	l = GetFullPathNameW(wname, 0, NULL, NULL);
+	if (l == 0)
+		return (NULL);
+	/* NOTE: GetFullPathNameW has a bug that if the length of the file
+	 * name is just 1 then it returns incomplete buffer size. Thus, we
+	 * have to add three to the size to allocate a sufficient buffer
+	 * size for the full-pathname of the file name. */
+	l += 3;
+	wnp = malloc(l * sizeof(wchar_t));
+	if (wnp == NULL)
+		return (NULL);
+	len = GetFullPathNameW(wname, l, wnp, NULL);
+	wn = wnp;
+
+	if (wnp[0] == L'\\' && wnp[1] == L'\\' &&
+	    wnp[2] == L'?' && wnp[3] == L'\\')
+		/* We have already a permissive name. */
+		return (wn);
+
+	if (wnp[0] == L'\\' && wnp[1] == L'\\' &&
+		wnp[2] == L'.' && wnp[3] == L'\\') {
+		/* This is a device name */
+		if (((wnp[4] >= L'a' && wnp[4] <= L'z') ||
+		     (wnp[4] >= L'A' && wnp[4] <= L'Z')) &&
+		    wnp[5] == L':' && wnp[6] == L'\\')
+			wnp[2] = L'?';/* Not device name. */
+		return (wn);
+	}
+
+	unc = 0;
+	if (wnp[0] == L'\\' && wnp[1] == L'\\' && wnp[2] != L'\\') {
+		wchar_t *p = &wnp[2];
+
+		/* Skip server-name letters. */
+		while (*p != L'\\' && *p != L'\0')
+			++p;
+		if (*p == L'\\') {
+			wchar_t *rp = ++p;
+			/* Skip share-name letters. */
+			while (*p != L'\\' && *p != L'\0')
+				++p;
+			if (*p == L'\\' && p != rp) {
+				/* Now, match patterns such as
+				 * "\\server-name\share-name\" */
+				wnp += 2;
+				len -= 2;
+				unc = 1;
+			}
+		}
+	}
+
+	slen = 4 + (unc * 4) + len + 1;
+	ws = wsp = malloc(slen * sizeof(wchar_t));
+	if (ws == NULL) {
+		free(wn);
+		return (NULL);
+	}
+	/* prepend "\\?\" */
+	wcsncpy(wsp, L"\\\\?\\", 4);
+	wsp += 4;
+	slen -= 4;
+	if (unc) {
+		/* append "UNC\" ---> "\\?\UNC\" */
+		wcsncpy(wsp, L"UNC\\", 4);
+		wsp += 4;
+		slen -= 4;
+	}
+	wcsncpy(wsp, wnp, slen);
+	wsp[slen - 1] = L'\0'; /* Ensure null termination. */
+	free(wn);
+	return (ws);
+}
+
+/*
+ * Create a file handle.
+ * This can exceed MAX_PATH limitation.
+ */
+static HANDLE
+la_CreateFile(const char *path, DWORD dwDesiredAccess, DWORD dwShareMode,
+    LPSECURITY_ATTRIBUTES lpSecurityAttributes, DWORD dwCreationDisposition,
+    DWORD dwFlagsAndAttributes, HANDLE hTemplateFile)
+{
+	wchar_t *wpath;
+	HANDLE handle;
+
+	handle = CreateFileA(path, dwDesiredAccess, dwShareMode,
+	    lpSecurityAttributes, dwCreationDisposition, dwFlagsAndAttributes,
+	    hTemplateFile);
+	if (handle != INVALID_HANDLE_VALUE)
+		return (handle);
+	if (GetLastError() != ERROR_PATH_NOT_FOUND)
+		return (handle);
+	wpath = __la_win_permissive_name(path);
+	if (wpath == NULL)
+		return (handle);
+	handle = CreateFileW(wpath, dwDesiredAccess, dwShareMode,
+	    lpSecurityAttributes, dwCreationDisposition, dwFlagsAndAttributes,
+	    hTemplateFile);
+	free(wpath);
+	return (handle);
+}
+
+#if defined(__LA_LSEEK_NEEDED)
+__int64
+__la_lseek(int fd, __int64 offset, int whence)
+{
+	LARGE_INTEGER distance;
+	LARGE_INTEGER newpointer;
+	HANDLE handle;
+
+	if (fd < 0) {
+		errno = EBADF;
+		return (-1);
+	}
+	handle = (HANDLE)_get_osfhandle(fd);
+	if (GetFileType(handle) != FILE_TYPE_DISK) {
+		errno = EBADF;
+		return (-1);
+	}
+	distance.QuadPart = offset;
+	if (!SetFilePointerEx_perso(handle, distance, &newpointer, whence)) {
+		DWORD lasterr;
+
+		lasterr = GetLastError();
+		if (lasterr == ERROR_BROKEN_PIPE)
+			return (0);
+		if (lasterr == ERROR_ACCESS_DENIED)
+			errno = EBADF;
+		else
+			la_dosmaperr(lasterr);
+		return (-1);
+	}
+	return (newpointer.QuadPart);
+}
+#endif
+
+/* This can exceed MAX_PATH limitation. */
+int
+__la_open(const char *path, int flags, ...)
+{
+	va_list ap;
+	wchar_t *ws;
+	int r, pmode;
+	DWORD attr;
+
+	va_start(ap, flags);
+	pmode = va_arg(ap, int);
+	va_end(ap);
+	ws = NULL;
+	if ((flags & ~O_BINARY) == O_RDONLY) {
+		/*
+		 * When we open a directory, _open function returns
+		 * "Permission denied" error.
+		 */
+		attr = GetFileAttributesA(path);
+		if (attr == (DWORD)-1 && GetLastError() == ERROR_PATH_NOT_FOUND) {
+			ws = __la_win_permissive_name(path);
+			if (ws == NULL) {
+				errno = EINVAL;
+				return (-1);
+			}
+			attr = GetFileAttributesW(ws);
+		}
+		if (attr == (DWORD)-1) {
+			la_dosmaperr(GetLastError());
+			free(ws);
+			return (-1);
+		}
+		if (attr & FILE_ATTRIBUTE_DIRECTORY) {
+			HANDLE handle;
+
+			if (ws != NULL)
+				handle = CreateFileW(ws, 0, 0, NULL,
+				    OPEN_EXISTING,
+				    FILE_FLAG_BACKUP_SEMANTICS |
+				    FILE_ATTRIBUTE_READONLY,
+					NULL);
+			else
+				handle = CreateFileA(path, 0, 0, NULL,
+				    OPEN_EXISTING,
+				    FILE_FLAG_BACKUP_SEMANTICS |
+				    FILE_ATTRIBUTE_READONLY,
+					NULL);
+			free(ws);
+			if (handle == INVALID_HANDLE_VALUE) {
+				la_dosmaperr(GetLastError());
+				return (-1);
+			}
+			r = _open_osfhandle((intptr_t)handle, _O_RDONLY);
+			return (r);
+		}
+	}
+	if (ws == NULL) {
+#if defined(__BORLANDC__)
+		/* Borland has no mode argument.
+		   TODO: Fix mode of new file.  */
+		r = _open(path, flags);
+#else
+		r = _open(path, flags, pmode);
+#endif
+		if (r < 0 && errno == EACCES && (flags & O_CREAT) != 0) {
+			/* Simulate other POSIX system action to pass our test suite. */
+			attr = GetFileAttributesA(path);
+			if (attr == (DWORD)-1)
+				la_dosmaperr(GetLastError());
+			else if (attr & FILE_ATTRIBUTE_DIRECTORY)
+				errno = EISDIR;
+			else
+				errno = EACCES;
+			return (-1);
+		}
+		if (r >= 0 || errno != ENOENT)
+			return (r);
+		ws = __la_win_permissive_name(path);
+		if (ws == NULL) {
+			errno = EINVAL;
+			return (-1);
+		}
+	}
+	r = _wopen(ws, flags, pmode);
+	if (r < 0 && errno == EACCES && (flags & O_CREAT) != 0) {
+		/* Simulate other POSIX system action to pass our test suite. */
+		attr = GetFileAttributesW(ws);
+		if (attr == (DWORD)-1)
+			la_dosmaperr(GetLastError());
+		else if (attr & FILE_ATTRIBUTE_DIRECTORY)
+			errno = EISDIR;
+		else
+			errno = EACCES;
+	}
+	free(ws);
+	return (r);
+}
+
+ssize_t
+__la_read(int fd, void *buf, size_t nbytes)
+{
+	HANDLE handle;
+	DWORD bytes_read, lasterr;
+	int r;
+
+#ifdef _WIN64
+	if (nbytes > UINT32_MAX)
+		nbytes = UINT32_MAX;
+#endif
+	if (fd < 0) {
+		errno = EBADF;
+		return (-1);
+	}
+	/* Do not pass 0 to third parameter of ReadFile(), read bytes.
+	 * This will not return to application side. */
+	if (nbytes == 0)
+		return (0);
+	handle = (HANDLE)_get_osfhandle(fd);
+	r = ReadFile(handle, buf, (uint32_t)nbytes,
+	    &bytes_read, NULL);
+	if (r == 0) {
+		lasterr = GetLastError();
+		if (lasterr == ERROR_NO_DATA) {
+			errno = EAGAIN;
+			return (-1);
+		}
+		if (lasterr == ERROR_BROKEN_PIPE)
+			return (0);
+		if (lasterr == ERROR_ACCESS_DENIED)
+			errno = EBADF;
+		else
+			la_dosmaperr(lasterr);
+		return (-1);
+	}
+	return ((ssize_t)bytes_read);
+}
+
+/* Convert Windows FILETIME to UTC */
+__inline static void
+fileTimeToUTC(const FILETIME *filetime, time_t *t, long *ns)
+{
+	ULARGE_INTEGER utc;
+
+	utc.HighPart = filetime->dwHighDateTime;
+	utc.LowPart  = filetime->dwLowDateTime;
+	if (utc.QuadPart >= EPOC_TIME) {
+		utc.QuadPart -= EPOC_TIME;
+		*t = (time_t)(utc.QuadPart / 10000000);	/* milli seconds base */
+		*ns = (long)(utc.QuadPart % 10000000) * 100;/* nano seconds base */
+	} else {
+		*t = 0;
+		*ns = 0;
+	}
+}
+
+/* Stat by handle
+ * Windows' stat() does not accept the path added "\\?\" especially "?"
+ * character.
+ * It means we cannot access the long name path longer than MAX_PATH.
+ * So I've implemented a function similar to Windows' stat() to access the
+ * long name path.
+ * And I've added some feature.
+ * 1. set st_ino by nFileIndexHigh and nFileIndexLow of
+ *    BY_HANDLE_FILE_INFORMATION.
+ * 2. set st_nlink by nNumberOfLinks of BY_HANDLE_FILE_INFORMATION.
+ * 3. set st_dev by dwVolumeSerialNumber by BY_HANDLE_FILE_INFORMATION.
+ */
+static int
+__hstat(HANDLE handle, struct ustat *st)
+{
+	BY_HANDLE_FILE_INFORMATION info;
+	ULARGE_INTEGER ino64;
+	DWORD ftype;
+	mode_t mode;
+	time_t t;
+	long ns;
+
+	switch (ftype = GetFileType(handle)) {
+	case FILE_TYPE_UNKNOWN:
+		errno = EBADF;
+		return (-1);
+	case FILE_TYPE_CHAR:
+	case FILE_TYPE_PIPE:
+		if (ftype == FILE_TYPE_CHAR) {
+			st->st_mode = S_IFCHR;
+			st->st_size = 0;
+		} else {
+			DWORD avail;
+
+			st->st_mode = S_IFIFO;
+			if (PeekNamedPipe(handle, NULL, 0, NULL, &avail, NULL))
+				st->st_size = avail;
+			else
+				st->st_size = 0;
+		}
+		st->st_atime = 0;
+		st->st_atime_nsec = 0;
+		st->st_mtime = 0;
+		st->st_mtime_nsec = 0;
+		st->st_ctime = 0;
+		st->st_ctime_nsec = 0;
+		st->st_ino = 0;
+		st->st_nlink = 1;
+		st->st_uid = 0;
+		st->st_gid = 0;
+		st->st_rdev = 0;
+		st->st_dev = 0;
+		return (0);
+	case FILE_TYPE_DISK:
+		break;
+	default:
+		/* This ftype is undocumented type. */
+		la_dosmaperr(GetLastError());
+		return (-1);
+	}
+
+	ZeroMemory(&info, sizeof(info));
+	if (!GetFileInformationByHandle (handle, &info)) {
+		la_dosmaperr(GetLastError());
+		return (-1);
+	}
+
+	mode = S_IRUSR | S_IRGRP | S_IROTH;
+	if ((info.dwFileAttributes & FILE_ATTRIBUTE_READONLY) == 0)
+		mode |= S_IWUSR | S_IWGRP | S_IWOTH;
+	if (info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+		mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
+	else
+		mode |= S_IFREG;
+	st->st_mode = mode;
+
+	fileTimeToUTC(&info.ftLastAccessTime, &t, &ns);
+	st->st_atime = t;
+	st->st_atime_nsec = ns;
+	fileTimeToUTC(&info.ftLastWriteTime, &t, &ns);
+	st->st_mtime = t;
+	st->st_mtime_nsec = ns;
+	fileTimeToUTC(&info.ftCreationTime, &t, &ns);
+	st->st_ctime = t;
+	st->st_ctime_nsec = ns;
+	st->st_size =
+	    ((int64_t)(info.nFileSizeHigh) * ((int64_t)MAXDWORD + 1))
+		+ (int64_t)(info.nFileSizeLow);
+#ifdef SIMULATE_WIN_STAT
+	st->st_ino = 0;
+	st->st_nlink = 1;
+	st->st_dev = 0;
+#else
+	/* Getting FileIndex as i-node. We should remove a sequence which
+	 * is high-16-bits of nFileIndexHigh. */
+	ino64.HighPart = info.nFileIndexHigh & 0x0000FFFFUL;
+	ino64.LowPart  = info.nFileIndexLow;
+	st->st_ino = ino64.QuadPart;
+	st->st_nlink = info.nNumberOfLinks;
+	if (info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+		++st->st_nlink;/* Add parent directory. */
+	st->st_dev = info.dwVolumeSerialNumber;
+#endif
+	st->st_uid = 0;
+	st->st_gid = 0;
+	st->st_rdev = 0;
+	return (0);
+}
+
+static void
+copy_stat(struct stat *st, struct ustat *us)
+{
+	st->st_atime = us->st_atime;
+	st->st_ctime = us->st_ctime;
+	st->st_mtime = us->st_mtime;
+	st->st_gid = us->st_gid;
+	st->st_ino = getino(us);
+	st->st_mode = us->st_mode;
+	st->st_nlink = us->st_nlink;
+	st->st_size = (off_t)us->st_size;
+	st->st_uid = us->st_uid;
+	st->st_dev = us->st_dev;
+	st->st_rdev = us->st_rdev;
+}
+
+/*
+ * TODO: Remove a use of __la_fstat and __la_stat.
+ * We should use GetFileInformationByHandle in place
+ * where We still use the *stat functions.
+ */
+int
+__la_fstat(int fd, struct stat *st)
+{
+	struct ustat u;
+	int ret;
+
+	if (fd < 0) {
+		errno = EBADF;
+		return (-1);
+	}
+	ret = __hstat((HANDLE)_get_osfhandle(fd), &u);
+	if (ret >= 0) {
+		copy_stat(st, &u);
+		if (u.st_mode & (S_IFCHR | S_IFIFO)) {
+			st->st_dev = fd;
+			st->st_rdev = fd;
+		}
+	}
+	return (ret);
+}
+
+/* This can exceed MAX_PATH limitation. */
+int
+__la_stat(const char *path, struct stat *st)
+{
+	HANDLE handle;
+	struct ustat u;
+	int ret;
+
+	handle = la_CreateFile(path, 0, FILE_SHARE_READ, NULL, OPEN_EXISTING,
+		FILE_FLAG_BACKUP_SEMANTICS,
+		NULL);
+	if (handle == INVALID_HANDLE_VALUE) {
+		la_dosmaperr(GetLastError());
+		return (-1);
+	}
+	ret = __hstat(handle, &u);
+	CloseHandle(handle);
+	if (ret >= 0) {
+		char *p;
+
+		copy_stat(st, &u);
+		p = strrchr(path, '.');
+		if (p != NULL && strlen(p) == 4) {
+			char exttype[4];
+
+			++ p;
+			exttype[0] = toupper(*p++);
+			exttype[1] = toupper(*p++);
+			exttype[2] = toupper(*p++);
+			exttype[3] = '\0';
+			if (!strcmp(exttype, "EXE") || !strcmp(exttype, "CMD") ||
+				!strcmp(exttype, "BAT") || !strcmp(exttype, "COM"))
+				st->st_mode |= S_IXUSR | S_IXGRP | S_IXOTH;
+		}
+	}
+	return (ret);
+}
+
+/*
+ * This waitpid is limited implementation.
+ */
+pid_t
+__la_waitpid(HANDLE child, int *status, int option)
+{
+	DWORD cs;
+
+	(void)option;/* UNUSED */
+	do {
+		if (GetExitCodeProcess(child, &cs) == 0) {
+			CloseHandle(child);
+			la_dosmaperr(GetLastError());
+			*status = 0;
+			return (-1);
+		}
+	} while (cs == STILL_ACTIVE);
+
+	*status = (int)(cs & 0xff);
+	return (0);
+}
+
+ssize_t
+__la_write(int fd, const void *buf, size_t nbytes)
+{
+	DWORD bytes_written;
+
+#ifdef _WIN64
+	if (nbytes > UINT32_MAX)
+		nbytes = UINT32_MAX;
+#endif
+	if (fd < 0) {
+		errno = EBADF;
+		return (-1);
+	}
+	if (!WriteFile((HANDLE)_get_osfhandle(fd), buf, (uint32_t)nbytes,
+	    &bytes_written, NULL)) {
+		DWORD lasterr;
+
+		lasterr = GetLastError();
+		if (lasterr == ERROR_ACCESS_DENIED)
+			errno = EBADF;
+		else
+			la_dosmaperr(lasterr);
+		return (-1);
+	}
+	return (bytes_written);
+}
+
+/*
+ * Replace the Windows path separator '\' with '/'.
+ */
+static int
+replace_pathseparator(struct archive_wstring *ws, const wchar_t *wp)
+{
+	wchar_t *w;
+	size_t path_length;
+
+	if (wp == NULL)
+		return(0);
+	if (wcschr(wp, L'\\') == NULL)
+		return(0);
+	path_length = wcslen(wp);
+	if (archive_wstring_ensure(ws, path_length) == NULL)
+		return(-1);
+	archive_wstrncpy(ws, wp, path_length);
+	for (w = ws->s; *w; w++) {
+		if (*w == L'\\')
+			*w = L'/';
+	}
+	return(1);
+}
+
+static int
+fix_pathseparator(struct archive_entry *entry)
+{
+	struct archive_wstring ws;
+	const wchar_t *wp;
+	int ret = ARCHIVE_OK;
+
+	archive_string_init(&ws);
+	wp = archive_entry_pathname_w(entry);
+	switch (replace_pathseparator(&ws, wp)) {
+	case 0: /* Not replaced. */
+		break;
+	case 1: /* Replaced. */
+		archive_entry_copy_pathname_w(entry, ws.s);
+		break;
+	default:
+		ret = ARCHIVE_FAILED;
+	}
+	wp = archive_entry_hardlink_w(entry);
+	switch (replace_pathseparator(&ws, wp)) {
+	case 0: /* Not replaced. */
+		break;
+	case 1: /* Replaced. */
+		archive_entry_copy_hardlink_w(entry, ws.s);
+		break;
+	default:
+		ret = ARCHIVE_FAILED;
+	}
+	wp = archive_entry_symlink_w(entry);
+	switch (replace_pathseparator(&ws, wp)) {
+	case 0: /* Not replaced. */
+		break;
+	case 1: /* Replaced. */
+		archive_entry_copy_symlink_w(entry, ws.s);
+		break;
+	default:
+		ret = ARCHIVE_FAILED;
+	}
+	archive_wstring_free(&ws);
+	return(ret);
+}
+
+struct archive_entry *
+__la_win_entry_in_posix_pathseparator(struct archive_entry *entry)
+{
+	struct archive_entry *entry_main;
+	const wchar_t *wp;
+	int has_backslash = 0;
+	int ret;
+
+	wp = archive_entry_pathname_w(entry);
+	if (wp != NULL && wcschr(wp, L'\\') != NULL)
+		has_backslash = 1;
+	if (!has_backslash) {
+		wp = archive_entry_hardlink_w(entry);
+		if (wp != NULL && wcschr(wp, L'\\') != NULL)
+			has_backslash = 1;
+	}
+	if (!has_backslash) {
+		wp = archive_entry_symlink_w(entry);
+		if (wp != NULL && wcschr(wp, L'\\') != NULL)
+			has_backslash = 1;
+	}
+	/*
+	 * If there is no backslash chars, return the original.
+	 */
+	if (!has_backslash)
+		return (entry);
+
+	/* Copy entry so we can modify it as needed. */
+	entry_main = archive_entry_clone(entry);
+	if (entry_main == NULL)
+		return (NULL);
+	/* Replace the Windows path-separator '\' with '/'. */
+	ret = fix_pathseparator(entry_main);
+	if (ret < ARCHIVE_WARN) {
+		archive_entry_free(entry_main);
+		return (NULL);
+	}
+	return (entry_main);
+}
+
+
+/*
+ * The following function was modified from PostgreSQL sources and is
+ * subject to the copyright below.
+ */
+/*-------------------------------------------------------------------------
+ *
+ * win32error.c
+ *	  Map win32 error codes to errno values
+ *
+ * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *	  $PostgreSQL: pgsql/src/port/win32error.c,v 1.4 2008/01/01 19:46:00 momjian Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+/*
+PostgreSQL Database Management System
+(formerly known as Postgres, then as Postgres95)
+
+Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
+
+Portions Copyright (c) 1994, The Regents of the University of California
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose, without fee, and without a written agreement
+is hereby granted, provided that the above copyright notice and this
+paragraph and the following two paragraphs appear in all copies.
+
+IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
+DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
+LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
+DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
+INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS TO
+PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+*/
+
+static const struct {
+	DWORD		winerr;
+	int		doserr;
+} doserrors[] =
+{
+	{	ERROR_INVALID_FUNCTION, EINVAL	},
+	{	ERROR_FILE_NOT_FOUND, ENOENT	},
+	{	ERROR_PATH_NOT_FOUND, ENOENT	},
+	{	ERROR_TOO_MANY_OPEN_FILES, EMFILE	},
+	{	ERROR_ACCESS_DENIED, EACCES	},
+	{	ERROR_INVALID_HANDLE, EBADF	},
+	{	ERROR_ARENA_TRASHED, ENOMEM	},
+	{	ERROR_NOT_ENOUGH_MEMORY, ENOMEM	},
+	{	ERROR_INVALID_BLOCK, ENOMEM	},
+	{	ERROR_BAD_ENVIRONMENT, E2BIG	},
+	{	ERROR_BAD_FORMAT, ENOEXEC	},
+	{	ERROR_INVALID_ACCESS, EINVAL	},
+	{	ERROR_INVALID_DATA, EINVAL	},
+	{	ERROR_INVALID_DRIVE, ENOENT	},
+	{	ERROR_CURRENT_DIRECTORY, EACCES	},
+	{	ERROR_NOT_SAME_DEVICE, EXDEV	},
+	{	ERROR_NO_MORE_FILES, ENOENT	},
+	{	ERROR_LOCK_VIOLATION, EACCES	},
+	{	ERROR_SHARING_VIOLATION, EACCES	},
+	{	ERROR_BAD_NETPATH, ENOENT	},
+	{	ERROR_NETWORK_ACCESS_DENIED, EACCES	},
+	{	ERROR_BAD_NET_NAME, ENOENT	},
+	{	ERROR_FILE_EXISTS, EEXIST	},
+	{	ERROR_CANNOT_MAKE, EACCES	},
+	{	ERROR_FAIL_I24, EACCES	},
+	{	ERROR_INVALID_PARAMETER, EINVAL	},
+	{	ERROR_NO_PROC_SLOTS, EAGAIN	},
+	{	ERROR_DRIVE_LOCKED, EACCES	},
+	{	ERROR_BROKEN_PIPE, EPIPE	},
+	{	ERROR_DISK_FULL, ENOSPC	},
+	{	ERROR_INVALID_TARGET_HANDLE, EBADF	},
+	{	ERROR_INVALID_HANDLE, EINVAL	},
+	{	ERROR_WAIT_NO_CHILDREN, ECHILD	},
+	{	ERROR_CHILD_NOT_COMPLETE, ECHILD	},
+	{	ERROR_DIRECT_ACCESS_HANDLE, EBADF	},
+	{	ERROR_NEGATIVE_SEEK, EINVAL	},
+	{	ERROR_SEEK_ON_DEVICE, EACCES	},
+	{	ERROR_DIR_NOT_EMPTY, ENOTEMPTY	},
+	{	ERROR_NOT_LOCKED, EACCES	},
+	{	ERROR_BAD_PATHNAME, ENOENT	},
+	{	ERROR_MAX_THRDS_REACHED, EAGAIN	},
+	{	ERROR_LOCK_FAILED, EACCES	},
+	{	ERROR_ALREADY_EXISTS, EEXIST	},
+	{	ERROR_FILENAME_EXCED_RANGE, ENOENT	},
+	{	ERROR_NESTING_NOT_ALLOWED, EAGAIN	},
+	{	ERROR_NOT_ENOUGH_QUOTA, ENOMEM	}
+};
+
+void
+__la_dosmaperr(unsigned long e)
+{
+	int			i;
+
+	if (e == 0)
+	{
+		errno = 0;
+		return;
+	}
+
+	for (i = 0; i < (int)(sizeof(doserrors)/sizeof(doserrors[0])); i++)
+	{
+		if (doserrors[i].winerr == e)
+		{
+			errno = doserrors[i].doserr;
+			return;
+		}
+	}
+
+	/* fprintf(stderr, "unrecognized win32 error code: %lu", e); */
+	errno = EINVAL;
+	return;
+}
+
+#endif /* _WIN32 && !__CYGWIN__ */