From cf3b6f1f70ba68c818f760f7e2679bfadbc50087 Mon Sep 17 00:00:00 2001
From: Robert Smallshire <robert@smallshire.org.uk>
Date: Mon, 27 Apr 2015 12:51:39 +0200
Subject: [PATCH] Distinguish between Rev 0 and Rev 1 trace header formats.

---
 segpy/trace_header.py | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/segpy/trace_header.py b/segpy/trace_header.py
index 74a39bd..2cf5e42 100644
--- a/segpy/trace_header.py
+++ b/segpy/trace_header.py
@@ -2,7 +2,7 @@ from segpy.header import FormatMeta, field, BuildFromFormat
 from segpy.types import Int32, Int16
 
 
-class TraceHeaderFormat(metaclass=FormatMeta):
+class TraceHeaderFormatRev0(metaclass=FormatMeta):
 
     line_sequence_num = field(
         Int32, offset=1, default=0, documentation=
@@ -385,6 +385,9 @@ class TraceHeaderFormat(metaclass=FormatMeta):
         "Over travel associated with taper at beginning or end of line. 1 = down (or behind) 2 = up (or ahead)"
     )
 
+
+class TraceHeaderFormatRev1(TraceHeaderFormatRev0):
+
     cdp_x = field(
         Int32, offset=181, default=0, documentation=
         "X coordinate of ensemble (CDP) position of this trace. "
@@ -554,7 +557,13 @@ class TraceHeaderFormat(metaclass=FormatMeta):
         "6 = Kilograms (kg)"
     )
 
-class TraceHeader(metaclass=BuildFromFormat, format_class=TraceHeaderFormat):
+
+class TraceHeaderRev0(metaclass=BuildFromFormat, format_class=TraceHeaderFormatRev0):
     pass
 
 
+class TraceHeaderRev1(metaclass=BuildFromFormat, format_class=TraceHeaderFormatRev1):
+    pass
+
+
+