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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 COPYRIGHT
* OWNER OR CONTRIBUTORS 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.
*/
// This file contains the definitions for some convenience functions
// used to make FilePaths more useful.
#include "utils/cross/file_path_utils.h"
#include "base/file_util.h"
#include "base/string_util.h"
#include "base/file_path.h"
namespace o3d {
std::wstring FilePathToWide(const FilePath& input) {
#if defined(OS_WIN)
return input.value();
#else
return UTF8ToWide(input.value());
#endif
}
FilePath WideToFilePath(const std::wstring& input) {
#if defined(OS_WIN)
return FilePath(input);
#else
return FilePath(WideToUTF8(input));
#endif
}
String FilePathToUTF8(const FilePath& input) {
#if defined(OS_WIN)
return WideToUTF8(input.value());
#else
return input.value();
#endif
}
FilePath UTF8ToFilePath(const String& input) {
#if defined(OS_WIN)
return FilePath(UTF8ToWide(input));
#else
return FilePath(input);
#endif
}
FilePath::StringType UTF8ToFilePathStringType(const String& input) {
#if defined(OS_WIN)
return UTF8ToWide(input);
#else
return input;
#endif
}
bool AbsolutePath(FilePath* absolute_path) {
#if defined(OS_WIN)
return file_util::AbsolutePath(absolute_path);
#else
// On the Posix implementation of file_util::AbsolutePath,
// realpath() is used, which only works if the path actually exists.
// So, we try using AbsolutePath, and if it doesn't work, we fake it
// by just prepending the current working direcory if it's not
// already absolute.
if (absolute_path->IsAbsolute()) {
return true;
} else {
FilePath new_absolute_path = FilePath(*absolute_path);
if (file_util::AbsolutePath(&new_absolute_path)) {
*absolute_path = new_absolute_path;
return true;
} else {
// OK, so we failed to make an absolute path above, and we know
// it's not an absolute path to begin with, so we just prepend
// the current working directory.
FilePath cwd_path;
if (!file_util::GetCurrentDirectory(&cwd_path)) {
return false;
}
*absolute_path = cwd_path.Append(*absolute_path);
return true;
}
}
#endif
}
bool GetRelativePathIfPossible(const FilePath& base_dir,
const FilePath& candidate,
FilePath *result) {
FilePath parent = FilePath(base_dir.StripTrailingSeparators());
FilePath child = FilePath(candidate.StripTrailingSeparators());
// If we can't convert the child to an absolute path for some
// reason, then we just do nothing and return the candidate.
if (!child.IsAbsolute() && !AbsolutePath(&child)) {
*result = candidate;
return false;
}
// If we can't convert the parent to an absolute path for some
// reason, then we just do nothing and return the absolute path to
// the child.
if (!parent.IsAbsolute() && !AbsolutePath(&parent)) {
*result = child;
return false;
}
FilePath::StringType child_str = child.value();
FilePath::StringType parent_str = parent.value();
// If the child is too short, it can't be a child of parent, and if
// it doesn't have a separator in the right place, then it also
// can't be a child, so we return the absolute path to the child.
// file_util::AbsolutePath() normalizes '/' to '\' on Windows, so we
// only need to check kSeparators[0].
if (child_str.length() <= parent_str.length() ||
child_str[parent_str.length()] != FilePath::kSeparators[0]) {
*result = child;
return false;
}
if (
#if defined(OS_WIN)
// file_util::AbsolutePath() does not flatten case on Windows,
// so we must do a case-insensitive compare.
StartsWith(child_str, parent_str, false)
#else
StartsWithASCII(child_str, parent_str, true)
#endif
) {
// Add one to skip over the dir separator.
child_str = child_str.substr(parent_str.size() + 1);
// Now we know we can return the relative path.
*result = FilePath(child_str);
return true;
} else {
*result = FilePath(child_str);
return false;
}
}
namespace { // anonymous namespace.
// Tries to find a file path_to_find in path_to_search. Will start with
// base name and progressively try each higher path. Example:
//
// FindFile('this/that', 'foo/bar/baf.txt');
//
// Looks for:
// this/that/foo/bar/baf.txt
// this/that/bar/baf.txt
// this/that/baf.txt
bool FindFileHelper(const FilePath& path_to_search,
const FilePath& path_to_find,
FilePath* found_path) {
std::vector<FilePath::StringType> parts;
path_to_find.GetComponents(&parts);
for (size_t ii = 0; ii < parts.size(); ++ii) {
// build a path from parts.
FilePath path(path_to_search);
for (size_t jj = ii; jj < parts.size(); ++jj) {
path = path.Append(parts[jj]);
}
if (file_util::PathExists(path)) {
*found_path = path;
return true;
}
}
return false;
}
} // anonymous namespace
bool FindFile(const std::vector<FilePath>& paths_to_search,
const FilePath& path_to_find,
FilePath* found_path) {
if (file_util::PathExists(path_to_find)) {
*found_path = path_to_find;
return true;
}
for (size_t ii = 0; ii < paths_to_search.size(); ++ii) {
FilePath absolute_path(paths_to_search[ii]);
o3d::AbsolutePath(&absolute_path);
if (FindFileHelper(absolute_path, path_to_find, found_path)) {
return true;
}
}
return false;
}
} // end namespace o3d
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