[11902] Import Recast Navigation

Import Recast Navigation as third party dependency
Credits go to Mikko Mononen memon at inside dot org

dep/recastnavigation/RecastDemo/Source/Filelist.cpp

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+//
+// Copyright (c) 2009-2010 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty.  In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#include "Filelist.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef WIN32
+#	include <io.h>
+#else
+#	include <dirent.h>
+#endif
+
+static void fileListAdd(FileList& list, const char* path)
+{
+	if (list.size >= FileList::MAX_FILES)
+		return;
+	int n = strlen(path);
+	list.files[list.size] = new char[n+1];
+	strcpy(list.files[list.size], path);
+	list.size++;
+}
+
+static void fileListClear(FileList& list)
+{
+	for (int i = 0; i < list.size; ++i)
+		delete [] list.files[i];
+	list.size = 0;
+}
+
+FileList::FileList() : size(0)
+{
+	memset(files, 0, sizeof(char*)*MAX_FILES);
+}
+
+FileList::~FileList()
+{
+	fileListClear(*this);
+}
+
+static int cmp(const void* a, const void* b)
+{
+	return strcmp(*(const char**)a, *(const char**)b);
+}
+	
+void scanDirectory(const char* path, const char* ext, FileList& list)
+{
+	fileListClear(list);
+	
+#ifdef WIN32
+	_finddata_t dir;
+	char pathWithExt[260];
+	long fh;
+	strcpy(pathWithExt, path);
+	strcat(pathWithExt, "/*");
+	strcat(pathWithExt, ext);
+	fh = _findfirst(pathWithExt, &dir);
+	if (fh == -1L)
+		return;
+	do
+	{
+		fileListAdd(list, dir.name);
+	}
+	while (_findnext(fh, &dir) == 0);
+	_findclose(fh);
+#else
+	dirent* current = 0;
+	DIR* dp = opendir(path);
+	if (!dp)
+		return;
+	
+	while ((current = readdir(dp)) != 0)
+	{
+		int len = strlen(current->d_name);
+		if (len > 4 && strncmp(current->d_name+len-4, ext, 4) == 0)
+		{
+			fileListAdd(list, current->d_name);
+		}
+	}
+	closedir(dp);
+#endif
+
+	if (list.size > 1)
+		qsort(list.files, list.size, sizeof(char*), cmp);
+}