#481 Fix ASCII control characters handling policy. Add 'keep_all' str…

…ing trimming policy.
AbsaOSS · Mar 25, 2022 · df9d579 · df9d579
1 parent 746a199
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diff --git a/README.md b/README.md
@@ -1203,17 +1203,17 @@ Again, the full example is available at
 
 ##### Data parsing options
 
-|            Option (usage example)          |                           Description |
-| ------------------------------------------ |:----------------------------------------------------------------------------- |
-| .option("string_trimming_policy", "both")  | Specifies if and how string fields should be trimmed. Available options: `both` (default), `none`, `left`, `right`. |
-| .option("ebcdic_code_page", "common")      | Specifies a code page for EBCDIC encoding. Currently supported values: `common` (default), `common_extended`, `cp037`, `cp037_extended`, `cp875`. `*_extended` code pages supports non-printable characters that converts to ASCII codes below 32. |
-| .option("ebcdic_code_page_class", "full.class.specifier") | Specifies a user provided class for a custom code page to UNICODE conversion. |
-| .option("ascii_charset", "US-ASCII")       | Specifies a charset to use to decode ASCII data. The value can be any charset supported by `java.nio.charset`: `US-ASCII` (default), `UTF-8`, `ISO-8859-1`, etc. |
-| .option("is_utf16_big_endian", "true")     | Specifies if UTF-16 encoded strings (`National` / `PIC N` format) are big-endian (default). |
-| .option("floating_point_format", "IBM")    | Specifies a floating-point format. Available options: `IBM` (default), `IEEE754`, `IBM_little_endian`, `IEEE754_little_endian`. |
+|            Option (usage example)          | Description                                                                                                                                                                                                                                                                       |
+| ------------------------------------------ |:----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| .option("string_trimming_policy", "both")  | Specifies if and how string fields should be trimmed. Available options: `both` (default), `none`, `left`, `right`, `keep_all`. `keep_all` - keeps control characters when decoding ASCII text files                                                                              |
+| .option("ebcdic_code_page", "common")      | Specifies a code page for EBCDIC encoding. Currently supported values: `common` (default), `common_extended`, `cp037`, `cp037_extended`, `cp875`. `*_extended` code pages supports non-printable characters that converts to ASCII codes below 32.                                |
+| .option("ebcdic_code_page_class", "full.class.specifier") | Specifies a user provided class for a custom code page to UNICODE conversion.                                                                                                                                                                                      |
+| .option("ascii_charset", "US-ASCII")       | Specifies a charset to use to decode ASCII data. The value can be any charset supported by `java.nio.charset`: `US-ASCII` (default), `UTF-8`, `ISO-8859-1`, etc.                                                                                                                  |
+| .option("is_utf16_big_endian", "true")     | Specifies if UTF-16 encoded strings (`National` / `PIC N` format) are big-endian (default).                                                                                                                                                                                       |
+| .option("floating_point_format", "IBM")    | Specifies a floating-point format. Available options: `IBM` (default), `IEEE754`, `IBM_little_endian`, `IEEE754_little_endian`.                                                                                                                                                   |
 | .option("variable_size_occurs", "false")   | If `false` (default) fields that have `OCCURS 0 TO 100 TIMES DEPENDING ON` clauses always have the same size corresponding to the maximum array size (e.g. 100 in this example). If set to `true` the size of the field will shrink for each field that has less actual elements. |
-| .option("occurs_mapping", "{\"FIELD\": {\"X\": 1}}")   | If specified, as a JSON string, allows for String `DEPENDING ON` fields with a corresponding mapping. |
-| .option("improved_null_detection", "false") | If `true`, values that contain only 0x0 ror DISPLAY strings and numbers will be considered `null`s instead of empty strings. |
+| .option("occurs_mapping", "{\"FIELD\": {\"X\": 1}}")   | If specified, as a JSON string, allows for String `DEPENDING ON` fields with a corresponding mapping.                                                                                                                                                                 |
+| .option("improved_null_detection", "false") | If `true`, values that contain only 0x0 ror DISPLAY strings and numbers will be considered `null`s instead of empty strings.                                                                                                                                                     |
 
 ##### Modifier options
 
@@ -1398,6 +1398,10 @@ at org.apache.hadoop.io.nativeio.NativeIO$POSIX.getStat(NativeIO.java:608)
 A: Update hadoop dll to version 3.2.2 or newer.
 
 ## Changelog
+- #### 2.4.10 will be released soon.
+   - [#481](https://github.com/AbsaOSS/cobrix/issues/481) ASCII control characters are now ignored instead of being replaced with spaces.
+     A new string trimming policy (`keep_all`) allows keeping all control characters in strings (including `0x00`).
+
 - #### 2.4.9 released 4 March 2022.
    - [#474](https://github.com/AbsaOSS/cobrix/issues/474) Fix numeric decoder of unsigned DISPLAY format. The decoder made more strict and does not allow sign
      overpunching for unsigned numbers.

diff --git a/...er/src/main/scala/za/co/absa/cobrix/cobol/parser/decoders/AsciiStringDecoderWrapper.scala b/...er/src/main/scala/za/co/absa/cobrix/cobol/parser/decoders/AsciiStringDecoderWrapper.scala
@@ -50,16 +50,15 @@ class AsciiStringDecoderWrapper(trimmingType: Int, asciiCharsetName: String, imp
     // Filter out all special characters
     val buf = new ArrayBuffer[Byte](bytes.length)
     while (i < bytes.length) {
-      if (bytes(i) >= 0 && bytes(i) < 32 /* Special characters are masked */ )
-        buf.append(32)
-      else
+      if (trimmingType == KeepAll || bytes(i) >= 32 || bytes(i) < 0) {
         buf.append(bytes(i))
+      }
       i = i + 1
     }
 
     val str = new String(buf.toArray, charset)
 
-    if (trimmingType == TrimNone) {
+    if (trimmingType == TrimNone || trimmingType == KeepAll) {
       str
     } else if (trimmingType == TrimLeft) {
       StringTools.trimLeft(str)

diff --git a/cobol-parser/src/main/scala/za/co/absa/cobrix/cobol/parser/decoders/DecoderSelector.scala b/cobol-parser/src/main/scala/za/co/absa/cobrix/cobol/parser/decoders/DecoderSelector.scala
@@ -99,6 +99,7 @@ object DecoderSelector {
       case TrimLeft => StringDecoders.TrimLeft
       case TrimRight => StringDecoders.TrimRight
       case TrimBoth => StringDecoders.TrimBoth
+      case KeepAll => StringDecoders.KeepAll
     }
   }
 

diff --git a/cobol-parser/src/main/scala/za/co/absa/cobrix/cobol/parser/decoders/StringDecoders.scala b/cobol-parser/src/main/scala/za/co/absa/cobrix/cobol/parser/decoders/StringDecoders.scala
@@ -31,6 +31,7 @@ object StringDecoders {
   val TrimLeft  = 2
   val TrimRight = 3
   val TrimBoth  = 4
+  val KeepAll   = 5
 
   // Characters used for HEX conversion
   private val HEX_ARRAY = "0123456789ABCDEF".toCharArray
@@ -55,7 +56,7 @@ object StringDecoders {
       i = i + 1
     }
 
-    if (trimmingType == TrimNone) {
+    if (trimmingType == TrimNone || trimmingType == KeepAll ) {
       buf.toString
     } else if (trimmingType == TrimLeft) {
       StringTools.trimLeft(buf.toString)
@@ -81,13 +82,15 @@ object StringDecoders {
     var i = 0
     val buf = new StringBuffer(bytes.length)
     while (i < bytes.length) {
-      if (bytes(i) < 32 /*Special and high order characters are masked*/ )
-        buf.append(' ')
-      else
+      if (trimmingType == KeepAll || bytes(i) >= 32) {
         buf.append(bytes(i).toChar)
+      } else if (bytes(i) < 0) {
+        buf.append(' ')
+      }
       i = i + 1
     }
-    if (trimmingType == TrimNone) {
+
+    if (trimmingType == TrimNone || trimmingType == KeepAll) {
       buf.toString
     } else if (trimmingType == TrimLeft) {
       StringTools.trimLeft(buf.toString)
@@ -116,7 +119,7 @@ object StringDecoders {
       new String(bytes, StandardCharsets.UTF_16LE)
     }
 
-    if (trimmingType == TrimNone) {
+    if (trimmingType == TrimNone || trimmingType == KeepAll) {
       utf16Str
     } else if (trimmingType == TrimLeft) {
       StringTools.trimLeft(utf16Str)

diff --git a/...-parser/src/main/scala/za/co/absa/cobrix/cobol/parser/policies/StringTrimmingPolicy.scala b/...-parser/src/main/scala/za/co/absa/cobrix/cobol/parser/policies/StringTrimmingPolicy.scala
@@ -19,7 +19,7 @@ package za.co.absa.cobrix.cobol.parser.policies
 object StringTrimmingPolicy extends Enumeration {
   type StringTrimmingPolicy = Value
 
-  val TrimNone, TrimLeft, TrimRight, TrimBoth = Value
+  val TrimNone, TrimLeft, TrimRight, TrimBoth, KeepAll = Value
 
   def withNameOpt(s: String): Option[Value] = {
     val exactNames = values.find(_.toString == s)
@@ -33,6 +33,8 @@ object StringTrimmingPolicy extends Enumeration {
         Some(TrimRight)
       } else if (sLowerCase == "both") {
         Some(TrimBoth)
+      } else if (sLowerCase == "keep_all") {
+        Some(KeepAll)
       } else {
         None
       }

diff --git a/...rc/test/scala/za/co/absa/cobrix/cobol/parser/decoders/AsciiStringDecoderWrapperSpec.scala b/...rc/test/scala/za/co/absa/cobrix/cobol/parser/decoders/AsciiStringDecoderWrapperSpec.scala
@@ -56,7 +56,7 @@ class AsciiStringDecoderWrapperSpec extends WordSpec {
       val str = "\u0001\u0005A\u0008\u0010B\u0015\u001F"
       val decoder = new AsciiStringDecoderWrapper(TrimNone, "ASCII", false)
 
-      assert(decoder(str.getBytes(StandardCharsets.UTF_8)) == "  A  B  ")
+      assert(decoder(str.getBytes(StandardCharsets.UTF_8)) == "AB")
     }
 
     "support left trimming" in {
@@ -81,7 +81,14 @@ class AsciiStringDecoderWrapperSpec extends WordSpec {
       val str = "\u0002\u0004A\u0007\u000FB\u0014\u001E"
       val decoder = new AsciiStringDecoderWrapper(TrimBoth, "ASCII", false)
 
-      assert(decoder(str.getBytes(StandardCharsets.UTF_8)) == "A  B")
+      assert(decoder(str.getBytes(StandardCharsets.UTF_8)) == "AB")
+    }
+
+    "be able to decode strings when keep_all is the trimming policy" in {
+      val str = "\u0002\u0004A\u0007\u000FB\u0014\u001E"
+      val decoder = new AsciiStringDecoderWrapper(KeepAll, "ASCII", false)
+
+      assert(decoder(str.getBytes(StandardCharsets.UTF_8)) == str)
     }
 
     "be serializable and deserializable" in {

diff --git a/data/test17_expected/test17d.txt b/data/test17_expected/test17d.txt
@@ -1,6 +1,6 @@
 {"File_Id":0,"Record_Id":2,"SEGMENT_ID":"C","COMPANY_ID":"9377942526","STATIC_DETAILS":{"COMPANY_NAME":"Joan Q & Z","ADDRESS":"10 Sandton, Johannesburg","TAXPAYER":{"TAXPAYER_TYPE":"A","TAXPAYER_STR":"92714306","TAXPAYER_NUM":959592241},"CONTACTS":[{"PHONE_NUMBER":"+(277) 944 44 55","CONTACT_PERSON":"Janiece Newcombe"}]}}
 {"File_Id":0,"Record_Id":6,"SEGMENT_ID":"C","COMPANY_ID":"3483483977","STATIC_DETAILS":{"COMPANY_NAME":"Robotrd Inc.","ADDRESS":"2 Park ave., Johannesburg","TAXPAYER":{"TAXPAYER_TYPE":"N","TAXPAYER_STR":"","TAXPAYER_NUM":31195396},"CONTACTS":[{"PHONE_NUMBER":"+(174) 970 97 54","CONTACT_PERSON":"Tyesha Debow"},{"PHONE_NUMBER":"+(848) 832 61 68","CONTACT_PERSON":"Mindy Celestin"},{"PHONE_NUMBER":"+(455) 184 13 39","CONTACT_PERSON":"Mabelle Winburn"}]}}
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+{"File_Id":0,"Record_Id":7,"SEGMENT_ID":"C","COMPANY_ID":"7540764401","STATIC_DETAILS":{"COMPANY_NAME":"Eqartion Inc.","ADDRESS":"871A Forest ave., Toronto","TAXPAYER":{"TAXPAYER_TYPE":"N","TAXPAYER_STR":"6H","TAXPAYER_NUM":87432264},"CONTACTS":[]}}
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@@ -49,12 +49,12 @@
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