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bug 50955 - try originally guessed codepoint, backoff to 1252 if that fails

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git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1790904 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Tim Allison 2017-04-11 01:30:02 +00:00
parent 1f41c31984
commit 44d536e4ce
1 changed files with 37 additions and 18 deletions
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55
src/scratchpad/src/org/apache/poi/hwpf/HWPFOldDocument.java
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@ -96,25 +96,17 @@ public class HWPFOldDocument extends HWPFDocumentCore {
} else {
// TODO Discover if these older documents can ever hold Unicode Strings?
// (We think not, because they seem to lack a Piece table)
// TODO Build the Piece Descriptor properly
// (We have to fake it, as they don't seem to have a proper Piece table)
PieceDescriptor pd = new PieceDescriptor(new byte[] {0,0, 0,0,0,127, 0,0}, 0, guessedCharset);
pd.setFilePosition(_fib.getFibBase().getFcMin());
// Generate a single Text Piece Table, with a single Text Piece
// which covers all the (8 bit only) text in the file
tpt = new OldTextPieceTable();
byte[] textData = new byte[_fib.getFibBase().getFcMac()-_fib.getFibBase().getFcMin()];
System.arraycopy(_mainStream, _fib.getFibBase().getFcMin(), textData, 0, textData.length);
int numChars = textData.length;
if (CodePageUtil.DOUBLE_BYTE_CHARSETS.contains(guessedCharset)) {
numChars /= 2;
//
// What we have here is a wretched hack. We need to figure out
// how to get the correct charset for the doc.
TextPiece tp = null;
try {
tp = buildTextPiece(guessedCharset);
} catch (IllegalStateException e) {
//if there was a problem with the guessed charset and the length of the
//textpiece, back off to win1252. This is effectively what we used to do.
tp = buildTextPiece(StringUtil.WIN_1252);
}
TextPiece tp = new TextPiece(
0, numChars, textData, pd
);
tpt.add(tp);
}
@ -156,6 +148,33 @@ public class HWPFOldDocument extends HWPFDocumentCore {
}
}
/**
*
* @param guessedCharset charset that we think this is
* @return a new text piece
* @throws IllegalStateException if the length isn't correct
*/
private TextPiece buildTextPiece(Charset guessedCharset) throws IllegalStateException {
PieceDescriptor pd = new PieceDescriptor(new byte[] {0,0, 0,0,0,127, 0,0}, 0, guessedCharset);
pd.setFilePosition(_fib.getFibBase().getFcMin());
// Generate a single Text Piece Table, with a single Text Piece
// which covers all the (8 bit only) text in the file
tpt = new OldTextPieceTable();
byte[] textData = new byte[_fib.getFibBase().getFcMac()-_fib.getFibBase().getFcMin()];
System.arraycopy(_mainStream, _fib.getFibBase().getFcMin(), textData, 0, textData.length);
int numChars = textData.length;
if (CodePageUtil.DOUBLE_BYTE_CHARSETS.contains(guessedCharset)) {
numChars /= 2;
}
return new TextPiece(
0, numChars, textData, pd
);
}
/**
* Take the first codepage that is not default, ansi or symbol.