fs/io/FileReader: add method GetFileInfo()

src/fs/FileInfo.hxx

@@ -54,6 +54,7 @@ class FileInfo {
 				bool follow_symlinks);
 	friend bool GetFileInfo(Path path, FileInfo &info,
 				Error &error);
+	friend class FileReader;
 
 #ifdef WIN32
 	WIN32_FILE_ATTRIBUTE_DATA data;

src/fs/io/FileReader.cxx

@@ -19,7 +19,7 @@
 
 #include "config.h"
 #include "FileReader.hxx"
-#include "fs/FileSystem.hxx"
+#include "fs/FileInfo.hxx"
 #include "util/Error.hxx"
 
 #ifdef WIN32
@@ -36,6 +36,14 @@ FileReader::FileReader(Path _path, Error &error)
 	}
 }
 
+bool
+FileReader::GetFileInfo(FileInfo &info, Error &error) const
+{
+	assert(IsDefined());
+
+	return ::GetFileInfo(path, info, error);
+}
+
 size_t
 FileReader::Read(void *data, size_t size, Error &error)
 {
@@ -83,6 +91,19 @@ FileReader::FileReader(Path _path, Error &error)
 		error.FormatErrno("Failed to open %s", path.c_str());
 }
 
+bool
+FileReader::GetFileInfo(FileInfo &info, Error &error) const
+{
+	assert(IsDefined());
+
+	const bool success = fstat(fd.Get(), &info.st) == 0;
+	if (!success)
+		error.FormatErrno("Failed to access %s",
+				  path.ToUTF8().c_str());
+
+	return success;
+}
+
 size_t
 FileReader::Read(void *data, size_t size, Error &error)
 {

src/fs/io/FileReader.hxx

@@ -36,6 +36,7 @@
 #endif
 
 class Path;
+class FileInfo;
 
 class FileReader final : public Reader {
 	AllocatedPath path;
@@ -79,6 +80,8 @@ public:
 
 	void Close();
 
+	bool GetFileInfo(FileInfo &info, Error &error) const;
+
 	bool Seek(off_t offset, Error &error);
 
 	/* virtual methods from class Reader */