- uncoupled directory loader from the rest of the engine.

src/common/filesystem/fs_findfile.cpp

@@ -0,0 +1,232 @@
+/*
+** findfile.cpp
+** Wrapper around the native directory scanning APIs
+**
+**---------------------------------------------------------------------------
+** Copyright 1998-2016 Randy Heit
+** Copyright 2005-2020 Christoph Oelckers
+**
+** 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.
+** 3. The name of the author may not be used to endorse or promote products
+**    derived from this software without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
+**---------------------------------------------------------------------------
+**
+*/
+
+#include "fs_findfile.h"
+
+#ifndef _WIN32
+
+#include <unistd.h>
+#include <fnmatch.h>
+#include <sys/stat.h>
+
+static const char *pattern;
+
+static int matchfile(const struct dirent *ent)
+{
+	return fnmatch(pattern, ent->d_name, FNM_NOESCAPE) == 0;
+}
+
+void *FS_FindFirst(const char *const filespec, fs_findstate_t *const fileinfo)
+{
+	const char* dir;
+
+	const char *const slash = strrchr(filespec, '/');
+
+	if (slash)
+	{
+		pattern = slash + 1;
+		fileinfo->path = std::string(filespec, slash - filespec + 1);
+		dir = fileinfo->path.c_str();
+	}
+	else
+	{
+		pattern = filespec;
+		dir = ".";
+	}
+
+	fileinfo->current = 0;
+	fileinfo->count = scandir(dir, &fileinfo->namelist, matchfile, alphasort);
+
+	if (fileinfo->count > 0)
+	{
+		return fileinfo;
+	}
+
+	return (void *)-1;
+}
+
+int FS_FindNext(void *const handle, fs_findstate_t *const fileinfo)
+{
+	fs_findstate_t *const state = static_cast<fs_findstate_t *>(handle);
+
+	if (state->current < fileinfo->count)
+	{
+		return ++state->current < fileinfo->count ? 0 : -1;
+	}
+
+	return -1;
+}
+
+int FS_FindClose(void *const handle)
+{
+	fs_findstate_t *const state = static_cast<fs_findstate_t *>(handle);
+
+	if (handle != (void *)-1 && state->count > 0)
+	{
+		for (int i = 0; i < state->count; ++i)
+		{
+			free(state->namelist[i]);
+		}
+
+		free(state->namelist);
+		state->namelist = nullptr;
+		state->count = 0;
+	}
+
+	return 0;
+}
+
+static bool DirEntryExists(const char* pathname, bool* isdir)
+{
+	if (isdir) *isdir = false;
+	struct stat info;
+	bool res = stat(pathname, &info) == 0;
+	if (isdir) *isdir = !!(info.st_mode & S_IFDIR);
+	return res;
+}
+
+int FS_FindAttr(fs_findstate_t *const fileinfo)
+{
+	dirent *const ent = fileinfo->namelist[fileinfo->current];
+	const std::string path = fileinfo->path + ent->d_name;
+	bool isdir;
+
+	if (DirEntryExists(path.c_str(), &isdir))
+	{
+		return isdir ? FA_DIREC : 0;
+	}
+
+	return 0;
+}
+
+std::string FS_FullPath(const char* directory)
+{
+	// todo
+	return directory
+}
+
+#else
+
+#include <windows.h>
+#include <direct.h>
+
+std::wstring toWide(const char* str)
+{
+	int len = (int)strlen(str);
+	int size_needed = MultiByteToWideChar(CP_UTF8, 0, str, len, nullptr, 0);
+	std::wstring wide;
+	wide.resize(size_needed);
+	MultiByteToWideChar(CP_UTF8, 0, str, len, &wide.front(), size_needed);
+	return wide;
+}
+
+static std::string toUtf8(const wchar_t* str)
+{
+	auto len = wcslen(str);
+	int size_needed = WideCharToMultiByte(CP_UTF8, 0, str, (int)len, nullptr, 0, nullptr, nullptr);
+	std::string utf8;
+	utf8.resize(size_needed);
+	WideCharToMultiByte(CP_UTF8, 0, str, (int)len, &utf8.front(), size_needed, nullptr, nullptr);
+	return utf8;
+}
+
+//==========================================================================
+//
+// FS_FindFirst
+//
+// Start a pattern matching sequence.
+//
+//==========================================================================
+
+
+void *FS_FindFirst(const char *filespec, fs_findstate_t *fileinfo)
+{
+	static_assert(sizeof(WIN32_FIND_DATAW) == sizeof(fileinfo->FindData), "FindData size mismatch");
+	fileinfo->UTF8Name = "";
+	return FindFirstFileW(toWide(filespec).c_str(), (LPWIN32_FIND_DATAW)&fileinfo->FindData);
+}
+
+//==========================================================================
+//
+// FS_FindNext
+//
+// Return the next file in a pattern matching sequence.
+//
+//==========================================================================
+
+int FS_FindNext(void *handle, fs_findstate_t *fileinfo)
+{
+	fileinfo->UTF8Name = "";
+	return FindNextFileW((HANDLE)handle, (LPWIN32_FIND_DATAW)&fileinfo->FindData) == 0;
+}
+
+//==========================================================================
+//
+// FS_FindClose
+//
+// Finish a pattern matching sequence.
+//
+//==========================================================================
+
+int FS_FindClose(void *handle)
+{
+	return FindClose((HANDLE)handle);
+}
+
+//==========================================================================
+//
+// FS_FindName
+//
+// Returns the name for an entry
+//
+//==========================================================================
+
+const char *FS_FindName(fs_findstate_t *fileinfo)
+{
+	if (fileinfo->UTF8Name.empty())
+	{
+		fileinfo->UTF8Name = toUtf8(fileinfo->FindData.Name);
+	}
+	return fileinfo->UTF8Name.c_str();
+}
+
+std::string FS_FullPath(const char* directory)
+{
+	auto wdirectory = _wfullpath(nullptr, toWide(directory).c_str(), _MAX_PATH);
+	std::string sdirectory = toUtf8(wdirectory);
+	free((void*)wdirectory);
+	for (auto& c : sdirectory) if (c == '\\') c = '/';
+	return sdirectory;
+}
+#endif