General cleanup.

2026-09-09 11:34:00 +08:00 · 2014-09-01 13:58:34 +02:00
parent 3b8f3ac26c
commit dcac37022d
21 changed files with 1247 additions and 2266 deletions
@@ -0,0 +1,59 @@
+DATA_SAMPLE_FORMAT = {1: 'ibm',
+                      2: 'l',
+                      3: 'h',
+                      5: 'f',
+                      8: 'b'}
+
+# A mapping from SEG Y data types to format characters used by the struct module,
+# known a 'ctypes'
+CTYPES = {'l': 'l',
+          'long':   'l',
+          'int32':  'l',
+
+          'L': 'L',
+          'ulong':  'L',
+          'uint32': 'L',
+
+          'h': 'h',
+          'short':  'h',
+          'int16':  'h',
+
+          'H': 'H',
+          'ushort': 'H',
+          'uint16': 'H',
+
+          'c': 'b',
+          'char': 'b',
+          'b': 'b',
+
+          'B': 'B',
+          'uchar':  'B',
+
+          'f': 'f',
+          'float':  'f',
+
+          'ibm': 'ibm'}
+
+# TODO This is redundant with data in the SH_def below
+CTYPE_DESCRIPTION = {'ibm': 'IBM float',
+                     'l':   '32 bit signed integer',
+                     'L':   '32 bit unsigned integer',
+                     'h':   '16 bit signed integer',
+                     'H':   '16 bit unsigned integer',
+                     'f':   'IEEE float32',
+                     'b':   '8 bit signed char',
+                     'B':   '8 bit unsigned char'}
+
+
+SIZES = dict(l=4,
+             L=4,
+             h=2,
+             H=2,
+             b=1,
+             B=1,
+             f=4,
+             ibm=4)
+
+
+def size_in_bytes(ctype):
+    return SIZES[ctype]