FileAnalysis: move unique file handle string generation to script-layer

And add minimal integration with HTTP analyzer.

src/file_analysis/PendingFile.h

@@ -0,0 +1,37 @@
+#ifndef FILE_ANALYSIS_PENDINGFILE_H
+#define FILE_ANALYSIS_PENDINGFILE_H
+
+#include "Conn.h"
+
+namespace file_analysis {
+
+class PendingFile {
+public:
+
+	PendingFile(const u_char* arg_data, uint64 arg_len, uint64 arg_offset,
+	            Connection* arg_conn, bool arg_is_orig);
+
+	PendingFile(const u_char* arg_data, uint64 arg_len,
+	            Connection* arg_conn, bool arg_is_orig);
+
+	PendingFile(const PendingFile& other);
+
+	PendingFile& operator=(const PendingFile& other);
+
+	~PendingFile();
+
+	void Retry() const;
+
+private:
+
+	bool is_linear;
+	const u_char* data;
+	uint64 len;
+	uint64 offset;
+	Connection* conn;
+	bool is_orig;
+};
+
+} // namespace file_analysis
+
+#endif