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114
src/main/java/org/mozilla/universalchardet/CharsetDetector.java
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| //////////////////////////////////////////////////////////////////////////////// | ||
| // | ||
| // Editor - Text editor for Android | ||
| // | ||
| // Copyright © 2021 Bill Farmer | ||
| // | ||
| // This program is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // This program is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU General Public License | ||
| // along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| // | ||
| // Bill Farmer william j farmer [at] yahoo [dot] co [dot] uk. | ||
| // | ||
| //////////////////////////////////////////////////////////////////////////////// | ||
|
|
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| package org.mozilla.universalchardet; | ||
|
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| import java.io.BufferedInputStream; | ||
| import java.io.BufferedReader; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.io.InputStreamReader; | ||
|
|
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| import java.nio.charset.Charset; | ||
|
|
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| public class CharsetDetector | ||
| { | ||
| private CharsetDetector() {} | ||
|
|
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| /** | ||
| * Array of supported charsets | ||
| */ | ||
| public final static String[] CHARSETS = | ||
| { | ||
| Constants.CHARSET_ISO_2022_JP, | ||
| Constants.CHARSET_ISO_2022_CN, | ||
| Constants.CHARSET_ISO_2022_KR, | ||
| Constants.CHARSET_ISO_8859_5, | ||
| Constants.CHARSET_ISO_8859_7, | ||
| Constants.CHARSET_ISO_8859_8, | ||
| Constants.CHARSET_BIG5, | ||
| Constants.CHARSET_GB18030, | ||
| Constants.CHARSET_EUC_JP, | ||
| Constants.CHARSET_EUC_KR, | ||
| Constants.CHARSET_EUC_TW, | ||
| Constants.CHARSET_SHIFT_JIS, | ||
| Constants.CHARSET_IBM855, | ||
| Constants.CHARSET_IBM866, | ||
| Constants.CHARSET_KOI8_R, | ||
| Constants.CHARSET_MACCYRILLIC, | ||
| Constants.CHARSET_WINDOWS_1251, | ||
| Constants.CHARSET_WINDOWS_1252, | ||
| Constants.CHARSET_WINDOWS_1253, | ||
| Constants.CHARSET_WINDOWS_1255, | ||
| Constants.CHARSET_UTF_8, | ||
| Constants.CHARSET_UTF_16BE, | ||
| Constants.CHARSET_UTF_16LE, | ||
| Constants.CHARSET_UTF_32BE, | ||
| Constants.CHARSET_UTF_32LE, | ||
| Constants.CHARSET_TIS620, | ||
| Constants.CHARSET_US_ASCCI | ||
| }; | ||
|
|
||
| /** | ||
| * Gets the charset of content from InputStream. | ||
| * | ||
| * @param inputStream InputStream containing text file | ||
| * @return The charset of the file, null if cannot be determined | ||
| * @throws IOException if some IO error occurs | ||
| */ | ||
| public static String detectCharset(InputStream inputStream) | ||
| throws IOException | ||
| { | ||
| String encoding = UniversalDetector.detectCharset(inputStream); | ||
| inputStream.reset(); | ||
| return encoding; | ||
| } | ||
|
|
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| /** | ||
| * Create a reader from a file with correct encoding | ||
| * @param inputStream The stream to read from | ||
| * @param defaultCharset defaultCharset to use if can't be determined | ||
| * @return BufferedReader for the file with the correct encoding | ||
| * @throws java.io.IOException if some I/O error ocurrs | ||
| */ | ||
| public static BufferedReader createBufferedReader(InputStream inputStream, | ||
| Charset defaultCharset) | ||
| throws IOException | ||
| { | ||
| Charset cs = (defaultCharset == null)? | ||
| Charset.forName("UTF-8"): defaultCharset; | ||
|
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| String detectedEncoding = detectCharset(inputStream); | ||
|
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| if (detectedEncoding != null) | ||
| cs = Charset.forName(detectedEncoding); | ||
|
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| if (!cs.name().contains("UTF")) | ||
| return new BufferedReader | ||
| (new InputStreamReader(inputStream, cs)); | ||
|
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| return new BufferedReader | ||
| (new InputStreamReader | ||
| (new UnicodeBOMInputStream(inputStream), cs)); | ||
| } | ||
| } |