move CharsetVerifier to utils package

2 files changed, 1 insertions, 142 deletions

diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/CharsetVerifier.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/CharsetVerifier.java
deleted file mode 100644
index c563beeac..000000000
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/CharsetVerifier.java
+++ /dev/null
@@ -1,142 +0,0 @@
-package org.sufficientlysecure.keychain.operations;
-
-
-import java.nio.ByteBuffer;
-import java.nio.CharBuffer;
-import java.nio.charset.Charset;
-import java.nio.charset.CharsetDecoder;
-import java.nio.charset.CoderResult;
-import java.nio.charset.CodingErrorAction;
-
-import android.content.ClipDescription;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
-
-/** This class can be used to guess whether a stream of data is encoded in a given
- * charset or not.
- *
- * An object of this class must be initialized with a byte[] buffer, which should
- * be filled with data, then processed with {@link #readBytesFromBuffer}. This can
- * be done any number of times. Once all data has been read, a final status can be
- * read using the getter methods.
- */
-public class CharsetVerifier {
-
-    private final ByteBuffer bufWrap;
-    private final CharBuffer dummyOutput;
-
-    private final CharsetDecoder charsetDecoder;
-
-    private boolean isFinished;
-    private boolean isFaulty;
-    private boolean isGuessed;
-    private boolean isPossibleTextMimeType;
-    private boolean isTextMimeType;
-    private String charset;
-
-    public CharsetVerifier(@NonNull  byte[] buf, String mimeType, @Nullable String charset) {
-
-        isPossibleTextMimeType = ClipDescription.compareMimeTypes(mimeType, "application/octet-stream")
-                || ClipDescription.compareMimeTypes(mimeType, "application/x-download")
-                || ClipDescription.compareMimeTypes(mimeType, "text/*");
-        if (!isPossibleTextMimeType) {
-            charsetDecoder = null;
-            bufWrap = null;
-            dummyOutput = null;
-            return;
-        }
-        isTextMimeType = ClipDescription.compareMimeTypes(mimeType, "text/*");
-
-        bufWrap = ByteBuffer.wrap(buf);
-        dummyOutput = CharBuffer.allocate(buf.length);
-
-        // the charset defaults to us-ascii, but we want to default to utf-8
-        if (charset == null || "us-ascii".equals(charset)) {
-            charset = "utf-8";
-            isGuessed = true;
-        } else {
-            isGuessed = false;
-        }
-        this.charset = charset;
-
-        charsetDecoder = Charset.forName(charset).newDecoder();
-        charsetDecoder.onMalformedInput(CodingErrorAction.REPORT);
-        charsetDecoder.onUnmappableCharacter(CodingErrorAction.REPORT);
-        charsetDecoder.reset();
-    }
-
-    public void readBytesFromBuffer(int pos, int len) {
-        if (isFinished) {
-            throw new IllegalStateException("cannot write again after reading charset status!");
-        }
-        if (isFaulty || bufWrap == null) {
-            return;
-        }
-        bufWrap.rewind();
-        bufWrap.position(pos);
-        bufWrap.limit(len);
-        dummyOutput.rewind();
-        CoderResult result = charsetDecoder.decode(bufWrap, dummyOutput, false);
-        if (result.isError()) {
-            isFaulty = true;
-        }
-    }
-
-    private void finishIfNecessary() {
-        if (isFinished || isFaulty || bufWrap == null) {
-            return;
-        }
-        isFinished = true;
-        bufWrap.rewind();
-        bufWrap.limit(0);
-        dummyOutput.rewind();
-        CoderResult result = charsetDecoder.decode(bufWrap, dummyOutput, true);
-        if (result.isError()) {
-            isFaulty = true;
-        }
-    }
-
-    public boolean isCharsetFaulty() {
-        finishIfNecessary();
-        return isFaulty;
-    }
-
-    public boolean isCharsetGuessed() {
-        finishIfNecessary();
-        return isGuessed;
-    }
-
-    public String getCharset() {
-        finishIfNecessary();
-        if (!isPossibleTextMimeType || (isGuessed && isFaulty)) {
-            return null;
-        }
-        return charset;
-    }
-
-    public String getMaybeFaultyCharset() {
-        return charset;
-    }
-
-    /** Returns true if the data which was read is definitely binary.
-     *
-     * This can happen when either the supplied mimeType indicated a non-ambiguous
-     * binary data type, or if we guessed a charset but got errors while decoding.
-     */
-    public boolean isDefinitelyBinary() {
-        finishIfNecessary();
-        return !isTextMimeType && (!isPossibleTextMimeType || (isGuessed && isFaulty));
-    }
-
-    /** Returns true iff the data which was read is probably (or
-     * definitely) text.
-     *
-     * The corner case where isDefinitelyBinary returns false but isProbablyText
-     * returns true is where the charset was provided by the data (so is not
-     * guessed) but is still faulty.
-     */
-    public boolean isProbablyText() {
-        finishIfNecessary();
-        return isTextMimeType || isPossibleTextMimeType && (!isGuessed || !isFaulty);
-    }
-}
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/InputDataOperation.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/InputDataOperation.java
index 74d94d83e..0de878232 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/InputDataOperation.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/InputDataOperation.java
@@ -53,6 +53,7 @@ import org.sufficientlysecure.keychain.provider.ProviderHelper;
 import org.sufficientlysecure.keychain.provider.TemporaryFileProvider;
 import org.sufficientlysecure.keychain.service.InputDataParcel;
 import org.sufficientlysecure.keychain.service.input.CryptoInputParcel;
+import org.sufficientlysecure.keychain.util.CharsetVerifier;
 
 
 /** This operation deals with input data, trying to determine its type as it goes.