From 5adc143801103f6a914f3738a0f3986d4bff5630 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 7 Sep 2015 12:26:58 +0300
Subject: [PATCH] Add an unpack option to the data tool

---
 tool/tool.cpp | 43 +++++++++++++++++++++++++++++++++++++++++--
 tool/tool.h   |  2 ++
 2 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/tool/tool.cpp b/tool/tool.cpp
index d58853e..73c49f7 100644
--- a/tool/tool.cpp
+++ b/tool/tool.cpp
@@ -2,6 +2,7 @@
 #include <msp/io/buffered.h>
 #include <msp/io/console.h>
 #include <msp/io/file.h>
+#include <msp/datafile/packsource.h>
 #include <msp/datafile/parser.h>
 #include <msp/datafile/statement.h>
 #include "compiler.h"
@@ -18,6 +19,7 @@ DataTool::DataTool(int argc, char **argv):
 	float_size(0),
 	compress(false),
 	pack(false),
+	unpack(false),
 	debug(false)
 {
 	GetOpt getopt;
@@ -27,21 +29,34 @@ DataTool::DataTool(int argc, char **argv):
 	getopt.add_option('g', "debug", debug, GetOpt::NO_ARG).set_help("Display control statements");
 	getopt.add_option('o', "output", out_fn, GetOpt::REQUIRED_ARG).set_help("Output to a file instead of stdout", "FILE");
 	getopt.add_option('p', "pack", pack, GetOpt::NO_ARG).set_help("Create a pack from multiple files");
+	getopt.add_option('u', "unpack", unpack, GetOpt::NO_ARG).set_help("Unpacks files from packs into the current directory");
 	getopt.add_option('z', "compress", compress, GetOpt::NO_ARG).set_help("Produce a compressed datafile");
 	getopt.add_argument("infile", in_fns, GetOpt::OPTIONAL_ARG).set_help("Files to process");
 	getopt(argc, argv);
 
-	if(in_fns.empty())
-		in_fns.push_back("-");
+	if(compile+pack+unpack>1)
+		throw usage_error("Only one of -c, -p and -u may be specified");
 
 	if(pack && out_fn=="-")
 		throw usage_error("Can't write pack to stdout");
+
+	if(in_fns.empty())
+		in_fns.push_back("-");
+
+	if(unpack)
+	{
+		for(list<string>::const_iterator i=in_fns.begin(); i!=in_fns.end(); ++i)
+			if(*i=="-")
+				throw usage_error("Can't unpack from stdout");
+	}
 }
 
 int DataTool::main()
 {
 	if(pack)
 		do_pack();
+	else if(unpack)
+		do_unpack();
 	else if(compile)
 		do_compile();
 	else
@@ -100,6 +115,30 @@ void DataTool::do_pack()
 	packer.create_pack(out_fn);
 }
 
+void DataTool::do_unpack()
+{
+	DataFile::PackSource source;
+	for(list<string>::const_iterator i=in_fns.begin(); i!=in_fns.end(); ++i)
+		source.add_pack_file(*i);
+
+	list<DataFile::PackSource::FileInfo> files = source.list_files();
+	for(list<DataFile::PackSource::FileInfo>::const_iterator i=files.begin(); i!=files.end(); ++i)
+	{
+		IO::Seekable *in = source.open(i->name);
+		IO::Base *out = open_output(i->name);
+		char buf[16384];
+		while(1)
+		{
+			unsigned len = in->read(buf, sizeof(buf));
+			out->write(buf, len);
+			if(len<sizeof(buf))
+				break;
+		}
+		delete in;
+		delete out;
+	}
+}
+
 IO::Base *DataTool::open_output(const string &fn)
 {
 	if(fn=="-")
diff --git a/tool/tool.h b/tool/tool.h
index e33c954..88f849b 100644
--- a/tool/tool.h
+++ b/tool/tool.h
@@ -15,6 +15,7 @@ private:
 	unsigned float_size;
 	bool compress;
 	bool pack;
+	bool unpack;
 	bool debug;
 
 public:
@@ -25,6 +26,7 @@ private:
 	void do_transfer();
 	void do_compile();
 	void do_pack();
+	void do_unpack();
 	Msp::IO::Base *open_output(const std::string &);
 	Msp::IO::Base *open_input(const std::string &);
 public:
-- 
2.45.2