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Now tries to guess when byte mode is actually encoding text as UTF-8

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git-svn-id: https://zxing.googlecode.com/svn/trunk@186 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
srowen 2008-02-14 19:34:42 +00:00
parent 1ca6c123d4
commit e334937fa5
1 changed files with 14 additions and 4 deletions
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18
core/src/com/google/zxing/qrcode/decoder/DecodedBitStreamParser.java
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@ -41,6 +41,8 @@ final class DecodedBitStreamParser {
};
private static final String SHIFT_JIS = "Shift_JIS";
private static final boolean ASSUME_SHIFT_JIS;
private static final String UTF8 = "UTF-8";
private static final String ISO88591 = "ISO-8859-1";
static {
String platformDefault = System.getProperty("file.encoding");
@ -112,9 +114,9 @@ final class DecodedBitStreamParser {
}
// Shift_JIS may not be supported in some environments:
try {
result.append(new String(buffer, "Shift_JIS"));
result.append(new String(buffer, SHIFT_JIS));
} catch (UnsupportedEncodingException uee) {
throw new ReaderException("SHIFT_JIS encoding is not supported on this device");
throw new ReaderException(SHIFT_JIS + " encoding is not supported on this device");
}
}
@ -194,11 +196,17 @@ final class DecodedBitStreamParser {
if (ASSUME_SHIFT_JIS) {
return SHIFT_JIS;
}
// For now, merely tries to distinguish ISO-8859-1 and Shift_JIS,
// Does it start with the UTF-8 byte order mark? then guess it's UTF-8
if (bytes.length > 3 && bytes[0] == (byte) 0xEF && bytes[1] == (byte) 0xBB && bytes[2] == (byte) 0xBF) {
return UTF8;
}
// For now, merely tries to distinguish ISO-8859-1, UTF-8 and Shift_JIS,
// which should be by far the most common encodings. ISO-8859-1
// should not have bytes in the 0x80 - 0x9F range, while Shift_JIS
// uses this as a first byte of a two-byte character. If we see this
// followed by a valid second byte in Shift_JIS, assume it is Shift_JIS.
// If we see something else in that second byte, we'll make the risky guess
// that it's UTF-8.
int length = bytes.length;
for (int i = 0; i < length; i++) {
int value = bytes[i] & 0xFF;
@ -217,9 +225,11 @@ final class DecodedBitStreamParser {
return SHIFT_JIS;
}
}
// otherwise we're going to take a guess that it's UTF-8
return UTF8;
}
}
return "ISO-8859-1";
return ISO88591;
}
}