libcolord: Add cd_icc_set_created

This allows clients to override the creation time of an ICC profile,
particularly useful for code that tries to build deterministically.

2 files changed, 64 insertions, 0 deletions

diff --git a/lib/colord/cd-icc.c b/lib/colord/cd-icc.c
index 5e9441a..e5f436a 100644
--- a/lib/colord/cd-icc.c
+++ b/lib/colord/cd-icc.c
@@ -29,9 +29,11 @@
 #include <glib.h>
 #include <glib/gstdio.h>
 #include <lcms2.h>
+#include <lcms2_plugin.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#include <errno.h>
 #include <math.h>
 
 #include "cd-context-lcms.h"
@@ -70,6 +72,7 @@ typedef struct
 	gdouble			 version;
 	GHashTable		*mluc_data[CD_MLUC_LAST]; /* key is 'en_GB' or '' for default */
 	GHashTable		*metadata;
+	gint64			 creation_time;
 	guint32			 size;
 	GPtrArray		*named_colors;
 	guint			 temperature;
@@ -1673,6 +1676,43 @@ cd_icc_save_data (CdIcc *icc,
 			goto out;
 	}
 
+	/* finally, optionally override the created date */
+	if (priv->creation_time != -1) {
+		/*
+		 * LCMS2 maintainer rejects adding API to do this,
+		 * instead suggesting you munge the header directly:
+		 * https://github.com/mm2/Little-CMS/issues/71
+		 */
+		struct tm creation_time;
+		cmsICCHeader *header;
+		g_autoptr(GByteArray) mutable_data = NULL;
+
+		data = cd_icc_serialize_profile (icc, error);
+		if (data == NULL)
+			goto out;
+
+		mutable_data = g_bytes_unref_to_array (data);
+		data = NULL;
+
+		if (!gmtime_r (&priv->creation_time, &creation_time)) {
+			g_set_error (error,
+				     CD_ICC_ERROR,
+				     CD_ICC_ERROR_FAILED_TO_SAVE,
+				     "failed to translate creation time: %s (%i)",
+				     g_strerror (errno),
+				     errno);
+			goto out;
+		}
+		header = (cmsICCHeader*)mutable_data->data;
+		_cmsEncodeDateTimeNumber (&header->date, &creation_time);
+
+		/* we've changed the creation date, recalculate MD5 */
+		cmsCloseProfile (priv->lcms_profile);
+		priv->lcms_profile = cmsOpenProfileFromMemTHR (priv->context_lcms,
+							       mutable_data->data,
+							       mutable_data->len);
+	}
+
 	/* write profile id */
 	ret = cmsMD5computeID (priv->lcms_profile);
 	if (!ret) {
@@ -2398,6 +2438,10 @@ cd_icc_get_created (CdIcc *icc)
 
 	g_return_val_if_fail (CD_IS_ICC (icc), NULL);
 
+	/* If the creation time has been overridden, return that */
+	if (priv->creation_time != (gint64)-1)
+		return g_date_time_new_from_unix_local (priv->creation_time);
+
 	/* get the profile creation time and date */
 	if (!cmsGetHeaderCreationDateTime (priv->lcms_profile, &created_tm))
 		return NULL;
@@ -2414,6 +2458,23 @@ cd_icc_get_created (CdIcc *icc)
 }
 
 /**
+ * cd_icc_set_created
+ * @icc: A valid #CdIcc
+ *
+ * Sets the ICC creation date and time.
+ *
+ * Since: 1.4.2
+ **/
+void
+cd_icc_set_created (CdIcc *icc, GDateTime* creation_time)
+{
+	CdIccPrivate *priv = GET_PRIVATE (icc);
+
+	g_return_if_fail (CD_IS_ICC (icc));
+	priv->creation_time = g_date_time_to_unix (creation_time);
+}
+
+/**
  * cd_icc_get_checksum:
  * @icc: A valid #CdIcc
  *
@@ -3945,6 +4006,7 @@ cd_icc_init (CdIcc *icc)
 						     g_str_equal,
 						     g_free,
 						     g_free);
+	priv->creation_time = -1;
 	for (i = 0; i < CD_MLUC_LAST; i++) {
 		priv->mluc_data[i] = g_hash_table_new_full (g_str_hash,
 								 g_str_equal,
diff --git a/lib/colord/cd-icc.h b/lib/colord/cd-icc.h
index 35c605b..31699eb 100644
--- a/lib/colord/cd-icc.h
+++ b/lib/colord/cd-icc.h
@@ -195,6 +195,8 @@ void		 cd_icc_remove_metadata			(CdIcc		*icc,
 GPtrArray	*cd_icc_get_named_colors		(CdIcc		*icc);
 gboolean	 cd_icc_get_can_delete			(CdIcc		*icc);
 GDateTime	*cd_icc_get_created			(CdIcc		*icc);
+void		 cd_icc_set_created			(CdIcc		*icc,
+							 GDateTime	*creation_time);
 const gchar	*cd_icc_get_checksum			(CdIcc		*icc);
 const gchar	*cd_icc_get_description			(CdIcc		*icc,
 							 const gchar	*locale,