From: Robin Gareus <robin@gareus.org>
Date: Mon, 26 Jun 2017 17:39:40 +0000 (+0200)
Subject: Add convenience fn to compute a file's sha1sum
X-Git-Tag: 5.11~408
X-Git-Url: https://main.carlh.net/gitweb/?a=commitdiff_plain;h=007f3cdbba01b58dc37ec214836ab0960ee13f82;p=ardour.git

Add convenience fn to compute a file's sha1sum
---

diff --git a/libs/ardour/ardour/utils.h b/libs/ardour/ardour/utils.h
index 1208d9ce77..77dc8236a7 100644
--- a/libs/ardour/ardour/utils.h
+++ b/libs/ardour/ardour/utils.h
@@ -106,6 +106,8 @@ LIBARDOUR_API bool matching_unsuffixed_filename_exists_in (const std::string& di
 
 LIBARDOUR_API uint32_t how_many_dsp_threads ();
 
+LIBARDOUR_API std::string compute_sha1_of_file (std::string path);
+
 template<typename T> boost::shared_ptr<ControlList> route_list_to_control_list (boost::shared_ptr<RouteList> rl, boost::shared_ptr<T> (Stripable::*get_control)() const) {
 	boost::shared_ptr<ControlList> cl (new ControlList);
 	if (!rl) { return cl; }
diff --git a/libs/ardour/utils.cc b/libs/ardour/utils.cc
index f73f206d29..31a94702e1 100644
--- a/libs/ardour/utils.cc
+++ b/libs/ardour/utils.cc
@@ -52,6 +52,7 @@
 #include "pbd/stacktrace.h"
 #include "pbd/xml++.h"
 #include "pbd/basename.h"
+#include "pbd/scoped_file_descriptor.h"
 #include "pbd/strsplit.h"
 #include "pbd/replace_all.h"
 
@@ -719,6 +720,29 @@ ARDOUR::slider_position_to_gain_with_max (double g, double max_gain)
 	return position_to_gain (g) * max_gain / 2.0;
 }
 
+#include "sha1.c"
+
+std::string
+ARDOUR::compute_sha1_of_file (std::string path)
+{
+	PBD::ScopedFileDescriptor fd (g_open (path.c_str(), O_RDONLY, 0444));
+	if (fd < 0) {
+		return std::string ();
+	}
+	char buf[4096];
+	ssize_t n_read;
+	char hash[41];
+	Sha1Digest s;
+	sha1_init (&s);
+
+	while ((n_read = ::read(fd, buf, sizeof(buf))) > 0) {
+		sha1_write (&s, (const uint8_t*) buf, n_read);
+	}
+
+	sha1_result_hash (&s, hash);
+	return std::string (hash);
+}
+
 extern "C" {
 	void c_stacktrace() { stacktrace (cerr); }
 }