fhueske commented on a change in pull request #6823: [FLINK-10134] UTF-16
support for TextInputFormat bug refixed
URL: https://github.com/apache/flink/pull/6823#discussion_r225547565
##########
File path:
flink-core/src/main/java/org/apache/flink/api/common/io/DelimitedInputFormat.java
##########
@@ -504,16 +533,119 @@ private void initBuffers() {
this.end = false;
}
+ /**
+ * Set file bom encoding.
+ *
+ * @param split
+ */
+ private void setBomFileCharset(FileInputSplit split) {
+ try {
+ String filePath = split.getPath().toString();
+ if (this.fileBomCharsetMap.containsKey(filePath)) {
+ this.bomCharset =
this.fileBomCharsetMap.get(filePath);
+ } else {
+ byte[] checkBytes = new byte[]{(byte) 0x00,
(byte) 0xFE, (byte) 0xFF, (byte) 0xEF, (byte) 0xBB, (byte) 0xBF};
+ byte[] bomBuffer = new byte[4];
+
+ if (this.splitStart != 0) {
+ this.stream.seek(0);
+ this.stream.read(bomBuffer, 0,
bomBuffer.length);
+ this.stream.seek(split.getStart());
+ } else {
+ System.arraycopy(this.readBuffer, 0,
bomBuffer, 0, 3);
+ }
+
+ if ((bomBuffer[0] == checkBytes[0]) &&
(bomBuffer[1] == checkBytes[0]) && (bomBuffer[2] == checkBytes[1])
+ && (bomBuffer[3] == checkBytes[2])) {
+ this.bomCharset =
Charset.forName("UTF-32BE");
+ } else if ((bomBuffer[0] == checkBytes[2]) &&
(bomBuffer[1] == checkBytes[1]) && (bomBuffer[2] == checkBytes[0])
+ && (bomBuffer[3] == checkBytes[0])) {
+ this.bomCharset =
Charset.forName("UTF-32LE");
+ } else if ((bomBuffer[0] == checkBytes[3]) &&
(bomBuffer[1] == checkBytes[4]) && (bomBuffer[2] == checkBytes[5])) {
+ this.bomCharset =
Charset.forName("UTF-8");
+ } else if ((bomBuffer[0] == checkBytes[1]) &&
(bomBuffer[1] == checkBytes[2])) {
+ this.bomCharset =
Charset.forName("UTF-16BE");
+ } else if ((bomBuffer[0] == checkBytes[2]) &&
(bomBuffer[1] == checkBytes[1])) {
+ this.bomCharset =
Charset.forName("UTF-16LE");
+ } else {
+ this.bomCharset =
Charset.forName(charsetName);
+ }
+
+ this.fileBomCharsetMap.put(filePath,
this.bomCharset);
+ }
+ } catch (Exception e) {
+ LOG.warn("Failed to get file bom encoding.");
+ this.bomCharset = Charset.forName(charsetName);
+ }
+
+ setParasByCharset(this.bomCharset);
+ }
+
+ /**
+ * Set stepSize, delimiterNewLinePos, delimiterCarrageReturnPos by
charset.
+ *
+ * @param charset
+ */
+ private void setParasByCharset(Charset charset) {
Review comment:
This is very special logic for the default delimiter. We need to get the
correct `delimiter` bytes also for custom delimiter strings.
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