org.mozilla.universalchardet.prober.contextanalysis.EUCJPContextAnalysis Maven / Gradle / Ivy
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* for the specific language governing rights and limitations under the
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* The Original Code is Mozilla Communicator client code.
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* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
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* Contributor(s):
* Kohei TAKETA (Java port)
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package org.mozilla.universalchardet.prober.contextanalysis;
public class EUCJPContextAnalysis extends JapaneseContextAnalysis {
////////////////////////////////////////////////////////////////
// constants
////////////////////////////////////////////////////////////////
public static final int HIRAGANA_HIGHBYTE = 0xA4;
public static final int HIRAGANA_LOWBYTE_BEGIN = 0xA1;
public static final int HIRAGANA_LOWBYTE_END = 0xF3;
public static final int SINGLE_SHIFT_2 = 0x8E;
public static final int SINGLE_SHIFT_3 = 0x8F;
public static final int FIRSTPLANE_HIGHBYTE_BEGIN = 0xA1;
public static final int FIRSTPLANE_HIGHBYTE_END = 0xFE;
////////////////////////////////////////////////////////////////
// methods
////////////////////////////////////////////////////////////////
public EUCJPContextAnalysis() {
super();
}
@Override
protected void getOrder(Order order, final byte[] buf, int offset) {
order.order = -1;
order.charLength = 1;
int firstByte = buf[offset] & 0xFF;
if (firstByte == SINGLE_SHIFT_2 ||
(firstByte >= FIRSTPLANE_HIGHBYTE_BEGIN &&
firstByte <= FIRSTPLANE_HIGHBYTE_END)) {
order.charLength = 2;
} else if (firstByte == SINGLE_SHIFT_3) {
order.charLength = 3;
}
if (firstByte == HIRAGANA_HIGHBYTE) {
int secondByte = buf[offset+1] & 0xFF;
if (secondByte >= HIRAGANA_LOWBYTE_BEGIN &&
secondByte <= HIRAGANA_LOWBYTE_END) {
order.order = (secondByte - HIRAGANA_LOWBYTE_BEGIN);
}
}
}
@Override
protected int getOrder(final byte[] buf, int offset) {
int highbyte = buf[offset] & 0xFF;
if (highbyte == HIRAGANA_HIGHBYTE) {
int lowbyte = buf[offset+1] & 0xFF;
if (lowbyte >= HIRAGANA_LOWBYTE_BEGIN &&
lowbyte <= HIRAGANA_LOWBYTE_END) {
return (lowbyte - HIRAGANA_LOWBYTE_BEGIN);
}
}
return -1;
}
}