Trivial wrapper around vfs_next_dirent, to make some other code a little tidier

This was SVN commit r1040.

source/ps/VFSUtil.cpp

@@ -0,0 +1,42 @@
+#include "precompiled.h"
+
+#include "VFSUtil.h"
+#include "lib/res/vfs.h"
+
+#include "CLogger.h"
+#define LOG_CATEGORY "vfs"
+
+using namespace VFSUtil;
+
+// Because I'm lazy, and it saves a few lines of code in other places:
+bool VFSUtil::FindFiles (CStr dirname, const char* filter, FileList& files)
+{
+	files.clear();
+
+	Handle dir = vfs_open_dir(dirname.c_str());
+	if (dir <= 0)
+	{
+		LOG(ERROR, LOG_CATEGORY, "Error opening directory '%s' (%lld)", dirname.c_str(), dir);
+		return false;
+	}
+
+	int err;
+	vfsDirEnt entry;
+	while ((err = vfs_next_dirent(dir, &entry, filter)) == 0)
+	{
+		files.push_back(dirname+"/"+entry.name);
+	}
+	// Can't tell the difference between end-of-directory and invalid filter;
+	// assume that err == -1 just means there are no files left (and err != -1
+	// means some other error)
+	if (err != -1)
+	{
+		LOG(ERROR, LOG_CATEGORY, "Error reading files from directory '%s' (%d)", dirname.c_str(), err);
+		return false;
+	}
+
+	vfs_close_dir(dir);
+
+	return true;
+
+}

source/ps/VFSUtil.h

@@ -0,0 +1,18 @@
+#include "ps/CStr.h"
+
+namespace VFSUtil
+{
+	typedef std::vector<CStr> FileList;
+
+	// Puts the list of files inside 'dirname' matching 'filter' into 'files'.
+	// 'dirname' shouldn't end with a slash.
+	// 'filter' is as in vfs_next_dirent:
+	//   - 0: any file;
+	//   - ".": any file without extension (filename doesn't contain '.');
+	//   - ".ext": any file with extension ".ext" (which must not contain '.');
+	//   - "/": any subdirectory
+	// 'files' is initially cleared, and undefined on failure.
+	// On failure, logs an error and returns false.
+	bool FindFiles(CStr dirname, const char* filter, FileList& files);
+
+};