From ca01dde4621cfb136f93096dc65a05d7fd0bbc2a Mon Sep 17 00:00:00 2001
From: Gard Spreemann <gspreemann@gmail.com>
Date: Mon, 16 Oct 2017 17:38:17 +0200
Subject: Saving barcodes in DIPHA's format.

---
 phstuff/diphawrapper.py | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/phstuff/diphawrapper.py b/phstuff/diphawrapper.py
index 1b633b5..517a929 100644
--- a/phstuff/diphawrapper.py
+++ b/phstuff/diphawrapper.py
@@ -303,6 +303,35 @@ def save_text_barcode(fname, barcode):
                 else:
                     f.write("%d %g inf\n" %(dim, interval.birth))
 
+def save_barcode(fname, barcode):
+    """Saves a barcode in DIPHA's format.
+
+    Parameters:
+    -----------
+    
+    fname: File name to save to.
+    
+    barcode: The barcode to save, a dictionary keyed on degree, each
+    entry being a list of `Interval`s.
+
+    """
+
+    with open(fname, "wb") as f:
+        f.write(struct.pack("<q", DIPHA_MAGIC))
+        f.write(struct.pack("<q", DIPHA_DIPHA_PERSISTENCE_DIAGRAM))
+
+        n = 0
+        for (dim, intervals) in barcode.items():
+            n += len(intervals)
+        f.write(struct.pack("<q", n))
+        
+        for (dim, intervals) in barcode.items():
+            for interval in intervals:
+                if interval.is_finite():
+                    f.write(struct.pack("<qdd", dim, interval.birth, interval.death))
+                else:
+                    f.write(struct.pack("<qdd", -dim - 1, interval.birth, float("inf")))
+
     
 
 class DiphaRunner:
-- 
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