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CWE-ou-minkata/Sources/Plasma/NucleusLib/pnUtils/Private/Win32/pnUtW32Path.cpp

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/*==LICENSE==*
CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
You can contact Cyan Worlds, Inc. by email legal@cyan.com
or by snail mail at:
Cyan Worlds, Inc.
14617 N Newport Hwy
Mead, WA 99021
*==LICENSE==*/
/*****************************************************************************
*
* $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/Win32/pnUtW32Path.cpp
*
***/
#include "../../Pch.h"
#pragma hdrstop
/*****************************************************************************
*
* Local functions
*
***/
// make sure our definition is at least as big as the compiler's definition
COMPILER_ASSERT(MAX_PATH >= _MAX_PATH);
//===========================================================================
static inline bool IsSlash (wchar c) {
return (c == L'\\') || (c == L'/');
}
//===========================================================================
static inline wchar ConvertSlash (wchar c) {
return c != L'/' ? c : L'\\';
}
//===========================================================================
static inline bool IsUncPath (const wchar path[]) {
return IsSlash(path[0]) && IsSlash(path[1]);
}
//===========================================================================
static const wchar * SkipUncDrive (const wchar path[]) {
// UNC drive: "//server/share"
// skip over leading "//"
path += 2;
// scan forward to end of server name
for (;; ++path) {
if (!*path)
return path;
if (IsSlash(*path))
break;
}
// skip over '/'
++path;
// skip over share name
for (;; ++path) {
if (!*path)
return path;
if (IsSlash(*path))
return path;
}
}
//===========================================================================
static wchar * PathSkipOverSeparator (wchar * path) {
for (; *path; ++path) {
if (IsSlash(*path))
return path + 1;
}
return path;
}
//===========================================================================
static unsigned CommonPrefixLength (
const wchar src1[],
const wchar src2[]
) {
ASSERT(src1);
ASSERT(src2);
wchar const * const base = src1;
const wchar * common = nil;
for (;;) {
// Are the next components equal in length?
const wchar * next1 = PathSkipOverSeparator(const_cast<wchar *>(src1));
const wchar * next2 = PathSkipOverSeparator(const_cast<wchar *>(src2));
const int componentLen = next1 - src1;
if (componentLen != (next2 - src2))
break;
// Are the next components equal in value?
if (!StrCmpI(src1, src2, componentLen))
common = next1;
else
break;
if (!*next1)
break;
src1 = next1 + 1;
if (!*next2)
break;
src2 = next2 + 1;
}
if (!common)
return 0;
// Compute length of common subchunk;
// if it is "C:" convert it to "C:\"
unsigned commonLen = common - base;
if ((commonLen == 2) && (base[1] == L':'))
++commonLen;
return commonLen;
}
//===========================================================================
static void GetProgramName (
void * instance,
wchar * dst,
unsigned dstChars
) {
ASSERT(dst);
ASSERT(dstChars);
if (!GetModuleFileNameW((HINSTANCE) instance, dst, dstChars)) {
ErrorAssert(__LINE__, __FILE__, "GetModuleName failed");
*dst = 0;
}
}
/****************************************************************************
*
* Exports
*
***/
//===========================================================================
void PathGetModuleName (
wchar * dst,
unsigned dstChars
) {
GetProgramName(ModuleGetInstance(), dst, dstChars);
}
//===========================================================================
void PathGetProgramName (
wchar * dst,
unsigned dstChars
) {
GetProgramName(nil, dst, dstChars);
}
//===========================================================================
bool PathFromString (
wchar * dst,
const wchar src[],
unsigned dstChars
) {
ASSERT(dst);
ASSERT(src);
ASSERT(dstChars);
for (;;) {
// enable src and dst to be the same buffer
wchar temp[MAX_PATH];
if (dst == src) {
StrCopy(temp, src, arrsize(temp));
src = temp;
}
DWORD const result = GetFullPathNameW(src, dstChars, dst, 0);
if (!result)
break;
if (dstChars < result)
break;
if (!dst[0])
break;
return true;
}
*dst = 0;
return false;
}
//===========================================================================
bool PathFromString (
wchar * dst, // ASSERT(dst);
const wchar src[], // ASSERT(src);
unsigned dstChars, // ASSERT(dstChars);
const wchar baseDir[] // ASSERT(baseDir);
) {
ASSERT(baseDir);
ASSERT(dstChars);
// Save current directory
wchar curr[MAX_PATH];
PathGetCurrentDirectory(curr, arrsize(curr));
// Perform string conversion from specified directory
bool result;
if (0 != (result = PathSetCurrentDirectory(baseDir)))
result = PathFromString(dst, src, dstChars);
else
*dst = 0;
// Restore directory
PathSetCurrentDirectory(curr);
return result;
}
//===========================================================================
// this function was originally derived from _tsplitpath in the MSVCRT library,
// but has been updated to support UNC paths and to avoid blasting off the end
// of the buffers.
void PathSplitPath (
const wchar path[],
wchar * drive,
wchar * dir,
wchar * fname,
wchar * ext
) {
ASSERT(path);
ASSERT(path != drive);
ASSERT(path != dir);
ASSERT(path != fname);
ASSERT(path != ext);
// check for UNC path
if (IsUncPath(path)) {
const wchar * pathStart = path;
path = SkipUncDrive(path);
if (drive)
StrCopy(drive, pathStart, min(MAX_DRIVE, path - pathStart + 1));
}
// regular DOS path
else if (path[0] && (path[1] == L':')) {
if (drive) {
ASSERT(MAX_DRIVE >= 3);
drive[0] = path[0];
drive[1] = L':';
drive[2] = L'\0';
}
path += 2; // skip over 'C' ':'
}
else if (drive) {
*drive = 0;
}
// extract path string, if any. Path now points to the first character
// of the path, if any, or the filename or extension, if no path was
// specified. Scan ahead for the last occurence, if any, of a '/' or
// '\' path separator character. If none is found, there is no path.
// We will also note the last '.' character found, if any, to aid in
// handling the extension.
const wchar *last_slash = nil, *last_dot = nil, *p = path;
for (; *p; p++) {
if (IsSlash(*p))
last_slash = p + 1; // point to one beyond for later copy
else if (*p == L'.')
last_dot = p;
}
if (last_slash) {
if (dir)
StrCopy(dir, path, min(MAX_DIR, last_slash - path + 1));
path = last_slash;
}
else if (dir) {
*dir = 0;
}
// extract file name and extension, if any. Path now points to the
// first character of the file name, if any, or the extension if no
// file name was given. Dot points to the '.' beginning the extension,
// if any.
if (last_dot && (last_dot >= path)) {
if (fname)
StrCopy(fname, path, min(MAX_FNAME, last_dot - path + 1));
if (ext)
StrCopy(ext, last_dot, MAX_EXT);
}
else {
if (fname)
StrCopy(fname, path, MAX_FNAME);
if (ext)
*ext = 0;
}
}
//===========================================================================
void PathMakePath (
wchar * path,
unsigned chars,
const wchar drive[],
const wchar dir[],
const wchar fname[],
const wchar ext[]
) {
ASSERT(path);
ASSERT(path != drive);
ASSERT(path != dir);
ASSERT(path != fname);
ASSERT(path != ext);
// save space for string terminator
if (!chars--)
return;
// copy drive
if (drive && *drive && chars) {
do {
*path++ = ConvertSlash(*drive++);
} while (--chars && *drive);
ASSERT(!IsSlash(path[-1]));
}
// copy directory
if (dir && *dir && chars) {
do {
*path++ = ConvertSlash(*dir++);
} while (--chars && *dir);
// add trailing backslash
if (chars && (path[-1] != '\\')) {
*path++ = L'\\';
chars--;
}
}
// copy filename
if (fname && *fname && chars) {
// skip leading backslash
if (IsSlash(*fname))
++fname;
do {
*path++ = ConvertSlash(*fname++);
} while (--chars && *fname);
}
// copy extension
if (ext && *ext && chars) {
if (*ext != L'.') {
*path++ = L'.';
chars--;
}
while (chars-- && *ext)
*path++ = ConvertSlash(*ext++);
}
// add string terminator
*path = L'\0';
}
//===========================================================================
bool PathMakeRelative (
wchar *dst,
unsigned fromFlags, // 0 or kPathFlagDirectory
const wchar from[],
unsigned toFlags, // 0 or kPathFlagDirectory
const wchar to[],
unsigned dstChars
) {
ASSERT(dst);
ASSERT(from);
ASSERT(to);
ASSERT(dstChars);
*dst = 0;
unsigned prefixLength = CommonPrefixLength(from, to);
if (!prefixLength)
return false;
wchar fromBuf[MAX_PATH];
if (fromFlags & kPathFlagDirectory)
StrCopy(fromBuf, from, arrsize(fromBuf));
else
PathRemoveFilename(fromBuf, from, arrsize(fromBuf));
wchar toBuf[MAX_PATH];
if (toFlags & kPathFlagDirectory)
StrCopy(toBuf, to, arrsize(toBuf));
else
PathRemoveFilename(toBuf, to, arrsize(toBuf));
const wchar * curr = fromBuf + prefixLength;
if (*curr) {
// build ..\.. part of the path
if (IsSlash(*curr))
curr++; // skip slash
while (*curr) {
curr = PathSkipOverSeparator(const_cast<wchar *>(curr));
StrPack(dst, *curr ? L"..\\" : L"..", dstChars);
}
}
else {
StrCopy(dst, L".", dstChars);
}
if (to[prefixLength]) {
// deal with root case
if (!IsSlash(to[prefixLength]))
--prefixLength;
ASSERT(IsSlash(to[prefixLength]));
StrPack(dst, to + prefixLength, dstChars);
}
return true;
}
//===========================================================================
bool PathIsRelative (
const wchar src[]
) {
ASSERT(src);
if (!src[0])
return true;
if (IsSlash(src[0]))
return false;
if (src[1] == L':')
return false;
return true;
}
//===========================================================================
const wchar * PathFindFilename (
const wchar path[]
) {
ASSERT(path);
if (IsUncPath(path))
path = SkipUncDrive(path);
const wchar * last_slash = path;
for (const wchar * p = path; *p; p++) {
if ((*p == L'/') || (*p == L'\\') || (*p == L':'))
last_slash = p + 1;
}
return last_slash;
}
//===========================================================================
const wchar * PathFindExtension (
const wchar path[]
) {
ASSERT(path);
const wchar * last_dot = 0;
const wchar * p = PathFindFilename(path);
for ( ; *p; p++) {
if (*p == L'.')
last_dot = p;
}
return last_dot ? last_dot : p;
}
//===========================================================================
void PathGetCurrentDirectory (
wchar * dst,
unsigned dstChars
) {
ASSERT(dst);
ASSERT(dstChars);
DWORD result = GetCurrentDirectoryW(dstChars, dst);
if (!result || (result >= dstChars)) {
ErrorAssert(__LINE__, __FILE__, "GetDir failed");
*dst = 0;
}
}
//===========================================================================
void PathGetTempDirectory (
wchar * dst,
unsigned dstChars
) {
ASSERT(dst);
ASSERT(dstChars);
DWORD result = GetTempPathW(dstChars, dst);
if (!result || (result >= dstChars))
StrCopy(dst, L"C:\\temp\\", dstChars);
}
//============================================================================
void PathGetUserDirectory (
wchar * dst,
unsigned dstChars
) {
ASSERT(dst);
ASSERT(dstChars);
wchar temp[MAX_PATH]; // GetSpecialFolder path requires a buffer of MAX_PATH size or larger
if (SHGetSpecialFolderPathW(NULL, temp, CSIDL_LOCAL_APPDATA, TRUE) == FALSE)
StrCopy(temp, L"C:\\", arrsize(temp));
// append the product name
PathAddFilename(dst, temp, ProductLongName(), dstChars);
// ensure it exists
if (!PathDoesDirectoryExist(dst))
PathCreateDirectory(dst, kPathCreateDirFlagEntireTree);
}
//============================================================================
void PathGetLogDirectory (
wchar * dst,
unsigned dstChars
) {
ASSERT(dst);
ASSERT(dstChars);
PathGetUserDirectory(dst, dstChars);
PathAddFilename(dst, dst, L"Log", dstChars);
if (!PathDoesDirectoryExist(dst))
PathCreateDirectory(dst, kPathCreateDirFlagEntireTree);
}
//============================================================================
void PathGetInitDirectory (
wchar * dst,
unsigned dstChars
) {
ASSERT(dst);
ASSERT(dstChars);
PathGetUserDirectory(dst, dstChars);
PathAddFilename(dst, dst, L"Init", dstChars);
if (!PathDoesDirectoryExist(dst))
PathCreateDirectory(dst, kPathCreateDirFlagEntireTree);
}
//===========================================================================
bool PathSetCurrentDirectory (
const wchar path[]
) {
ASSERT(path);
return SetCurrentDirectoryW(path) != 0;
}
//===========================================================================
void PathSetProgramDirectory () {
wchar dir[MAX_PATH];
PathGetProgramDirectory(dir, arrsize(dir));
PathSetCurrentDirectory(dir);
}
//===========================================================================
void PathFindFiles (
ARRAY(PathFind) * paths,
const wchar fileSpec[],
unsigned pathFlags
) {
ASSERT(paths);
ASSERT(fileSpec);
HANDLE find;
WIN32_FIND_DATAW fd;
wchar directory[MAX_PATH];
PathRemoveFilename(directory, fileSpec, arrsize(directory));
if (INVALID_HANDLE_VALUE == (find = FindFirstFileW(fileSpec, &fd))) {
DWORD err = GetLastError();
if ((err != ERROR_FILE_NOT_FOUND) && (err != ERROR_PATH_NOT_FOUND))
ASSERTMSG(err, "PathFindFiles failed");
}
else {
// find all the items in the current directory
do {
unsigned fileFlags = 0;
if (fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
if (! (pathFlags & kPathFlagDirectory))
continue;
// don't add "." and ".."
if (fd.cFileName[0] == L'.') {
if (!fd.cFileName[1])
continue;
if (fd.cFileName[1] == L'.' && !fd.cFileName[2])
continue;
}
fileFlags = kPathFlagDirectory;
}
else {
if (! (pathFlags & kPathFlagFile))
continue;
fileFlags = kPathFlagFile;
}
if (fd.dwFileAttributes & FILE_ATTRIBUTE_HIDDEN) {
if (! (pathFlags & kPathFlagHidden))
continue;
fileFlags |= kPathFlagHidden;
}
if (fd.dwFileAttributes & FILE_ATTRIBUTE_SYSTEM) {
if (! (pathFlags & kPathFlagSystem))
continue;
fileFlags |= kPathFlagSystem;
}
// add this one to the list of found files
PathFind * pf = paths->New();
pf->flags = fileFlags;
pf->fileLength = ((qword) fd.nFileSizeHigh << 32) | fd.nFileSizeLow;
pf->lastWriteTime = * (const qword *) &fd.ftLastWriteTime;
PathAddFilename(pf->name, directory, fd.cFileName, arrsize(pf->name));
} while (FindNextFileW(find, &fd));
FindClose(find);
}
// check for directory recursing
if ((pathFlags & kPathFlagRecurse) || StrStr(fileSpec, L"**")) {
// recurse directories
}
else {
return;
}
wchar dirSpec[MAX_PATH];
PathAddFilename(dirSpec, directory, L"*", arrsize(dirSpec));
if (INVALID_HANDLE_VALUE == (find = FindFirstFileW(dirSpec, &fd))) {
DWORD err = GetLastError();
if ((err != ERROR_FILE_NOT_FOUND) && (err != ERROR_PATH_NOT_FOUND))
ErrorAssert(__LINE__, __FILE__, "PathFindFiles failed");
return;
}
// find all the directories in the current directory
const wchar * spec = PathFindFilename(fileSpec);
do {
if (! (fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)) {
continue;
}
if (fd.dwFileAttributes & FILE_ATTRIBUTE_HIDDEN) {
if (! (pathFlags & kPathFlagHidden))
continue;
}
if (fd.dwFileAttributes & FILE_ATTRIBUTE_SYSTEM) {
if (! (pathFlags & kPathFlagSystem))
continue;
}
// don't recurse "." and ".."
if (fd.cFileName[0] == L'.') {
if (!fd.cFileName[1])
continue;
if (fd.cFileName[1] == L'.' && !fd.cFileName[2])
continue;
}
// recursively search subdirectory
PathAddFilename(dirSpec, directory, fd.cFileName, arrsize(dirSpec));
PathAddFilename(dirSpec, dirSpec, spec, arrsize(dirSpec));
PathFindFiles(paths, dirSpec, pathFlags);
} while (FindNextFileW(find, &fd));
FindClose(find);
}
//===========================================================================
EPathCreateDirError PathCreateDirectory (const wchar path[], unsigned flags) {
ASSERT(path);
// convert from relative path to full path
wchar dir[MAX_PATH];
if (!PathFromString(dir, path, arrsize(dir))) {
return kPathCreateDirErrInvalidPath;
}
// are we going to build the entire directory tree?
wchar * dirEnd;
if (flags & kPathCreateDirFlagEntireTree) {
dirEnd = dir;
// skip over leading slashes in UNC paths
while (IsSlash(*dirEnd))
++dirEnd;
// skip forward to first directory
dirEnd = PathSkipOverSeparator(dirEnd);
}
// we're only creating the very last entry in the path
else {
dirEnd = dir + StrLen(dir);
}
bool result = true;
for (wchar saveChar = L' '; saveChar; *dirEnd++ = saveChar) {
// find the end of the current directory string and terminate it
dirEnd = PathSkipOverSeparator(dirEnd);
saveChar = *dirEnd;
*dirEnd = 0;
// create the directory and track the result from the last call
result = CreateDirectoryW(dir, (LPSECURITY_ATTRIBUTES) nil);
}
// if we successfully created the directory then we're done
if (result) {
// Avoid check for kPathCreateDirFlagOsError
COMPILER_ASSERT(kPathCreateDirSuccess == NO_ERROR);
return kPathCreateDirSuccess;
}
unsigned error = GetLastError();
switch (error) {
case ERROR_ACCESS_DENIED:
return kPathCreateDirErrAccessDenied;
case ERROR_ALREADY_EXISTS: {
DWORD attrib;
if (0xffffffff == (attrib = GetFileAttributesW(dir)))
return kPathCreateDirErrInvalidPath;
if (! (attrib & FILE_ATTRIBUTE_DIRECTORY))
return kPathCreateDirErrFileWithSameName;
if (flags & kPathCreateDirFlagCreateNew)
return kPathCreateDirErrDirExists;
}
return kPathCreateDirSuccess;
default:
return kPathCreateDirErrInvalidPath;
}
}
//===========================================================================
void PathDeleteDirectory (const wchar path[], unsigned flags) {
ASSERT(path);
// convert from relative path to full path
wchar dir[MAX_PATH];
if (!PathFromString(dir, path, arrsize(dir)))
return;
for (;;) {
// Important: in order to ensure that we don't delete NTFS
// partition links, we must ensure that this is a directory!
dword attributes = GetFileAttributesW(dir);
if (attributes == (dword) -1)
break;
if ((attributes & FILE_ATTRIBUTE_DIRECTORY) == 0)
break;
if (attributes & FILE_ATTRIBUTE_REPARSE_POINT)
break;
if (!RemoveDirectoryW(dir))
break;
if ((flags & kPathCreateDirFlagEntireTree) == 0)
break;
wchar * filename = PathFindFilename(dir);
if (!filename)
break;
// Move up one level in the directory hierarchy
unsigned oldLength = StrLen(dir);
while ((filename > dir) && IsSlash(filename[-1]))
--filename;
*filename = 0;
if (oldLength == StrLen(dir))
break;
}
}
//===========================================================================
bool PathDoesFileExist (const wchar fileName[]) {
dword attributes = GetFileAttributesW(fileName);
if (attributes == (dword) -1)
return false;
if (attributes & FILE_ATTRIBUTE_DIRECTORY)
return false;
return true;
}
//============================================================================
bool PathDoesDirectoryExist (const wchar directory[]) {
dword attributes = GetFileAttributesW(directory);
if (attributes == (dword) -1)
return false;
if (attributes & FILE_ATTRIBUTE_DIRECTORY)
return true;
return false;
}
//===========================================================================
bool PathDeleteFile (
const wchar file[]
) {
return DeleteFileW(file) != 0;
}
//===========================================================================
bool PathMoveFile (
const wchar src[],
const wchar dst[]
) {
return MoveFileW(src, dst) != 0;
}
//===========================================================================
bool PathCopyFile (
const wchar src[],
const wchar dst[]
) {
return CopyFileW(src, dst, FALSE) != 0;
}