Backport #75 in 2.5(.3)

Author: cowtowncoder

release-notes/CREDITS

@@ -34,4 +34,11 @@ Luke Nezda (nezda@github)
 * Suggested #56: Support comments (either via `CsvSchema`, or using std
   `JsonParser.Feature.ALLOW_YAML_COMMENTS.
  (requested by nezda@github)
- (2.5.0)
+ (2.5.0)
+
+David Navas (davidnavas@github)
+
+* Contributed #75: Support escapes at beginning of the file
+ (2.5.3)
+
+

release-notes/VERSION

@@ -4,6 +4,11 @@ Project: jackson-dataformat-csv
 === Releases ===
 ------------------------------------------------------------------------
 
+2.5.3 (not yet released)
+
+#75: Support escapes at beginning of the file
+ (contributed by David N)
+
 2.5.2 (29-Mar-2015)
 
 #66: Deserializing an empty string as an array field return a non-empty list of one empty String

src/main/java/com/fasterxml/jackson/dataformat/csv/impl/CsvDecoder.java

@@ -632,6 +632,12 @@ public String nextString() throws IOException
         outBuf[0] = (char) i;
         int outPtr = 1;
 
+        if (i == _escapeChar) {
+            // Reset the escaped character
+            outBuf[0] = _unescape();
+            return _nextUnquotedString(outBuf, outPtr);
+        }
+
         int ptr = _inputPtr;
         if (ptr >= _inputEnd) {
             if (!loadMore()) { // ok to have end-of-input but...

src/test/java/com/fasterxml/jackson/dataformat/csv/deser/TestParserEscapes.java

@@ -51,4 +51,15 @@ public void testSimpleEscapesInUnquoted() throws Exception
         assertEquals("Desc with\nlinefeed", result.desc);
     }
 
+    public void testEscapesAtStartInUnquoted() throws Exception
+    {
+        CsvMapper mapper = mapperForCsv();
+        CsvSchema schema = mapper.schemaFor(Desc.class).withColumnSeparator('|').withEscapeChar('\\');
+        final String id = "\\|abcdef"; // doubled for javac
+        final String desc = "Desc with\\\nlinefeed";
+        String input = id+"|"+desc+"\n";
+        Desc result = mapper.reader(schema).withType(Desc.class).readValue(input);
+        assertEquals("|abcdef", result.id);
+        assertEquals("Desc with\nlinefeed", result.desc);
+    }
 }