mbeckerle commented on a change in pull request #245: Added
X-DFDL-5-BIT-DFI-1661-DUI-001 char encoding
URL: https://github.com/apache/incubator-daffodil/pull/245#discussion_r297259993
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File path:
daffodil-io/src/main/scala/org/apache/daffodil/processors/charset/X_DFDL_MIL_STD.scala
##########
@@ -43,7 +43,15 @@ object BitsCharset6BitDFI264DUI001 extends {
object BitsCharset6BitDFI311DUI002 extends {
override val name = "X-DFDL-6-BIT-DFI-311-DUI-002"
override val bitWidthOfACodeUnit = 6
- override val decodeString =
"""\u00A0ABCDEFGHIJKLMNOPQRSTuVWXYZ\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD
\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD0123456789\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD"""
+ override val decodeString =
"""\u00A0ABCDEFGHIJKLMNOPQRSTUVWXYZ\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD
\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD0123456789\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD"""
+ override val replacementCharCode = 0x0
+ override val requiredBitOrder = BitOrder.LeastSignificantBitFirst
+} with BitsCharsetNonByteSize
+
+object BitsCharset5BitDFI1661DUI001 extends {
+ override val name = "X-DFDL-5-BIT-DFI-1661-DUI-001"
+ override val bitWidthOfACodeUnit = 5
+ override val decodeString =
"""\u00A0ABCDEFGHIJKLMNOPQRSTUVWXYZ\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD"""
Review comment:
Yup, a byteOrder "RTL-per-line" feature that splits the data at line
boundaries, then interprets each line as a documentPart with byteOrder "RTL".
That might be more natural for people to use. The "RTL" feature was added
specifically to make it possible to directly put a table from mil-std-2045
directly into a test case. E.g., see tests
- testMIL2045_47001D_Page70_TableB_I
- testMIL2045_47001D_Page70_TableB_I_with_string
in the daffodil-tdml-unittest module. You may find the style they use
helpful given you are dealing with formats which are mixtures of bit fields and
these 5, 6, and 7 bit character set strings.
They make good use of the fact that only 0 and 1 are interpreted as
contributing bits to the result, but you'll notice they have one documentPart
per line for exactly the reasons expected - we want RTL, not bottom to top.
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