externalize CharsetVerifier, add looksLikeText to OpenPgpMetadata object

2 files changed, 140 insertions, 76 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
new file mode 100644
index 000000000..5d63ced22
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/CharsetVerifier.java
@@ -0,0 +1,122 @@
+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;
+
+
+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 write(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;
+    }
+
+    public boolean isDefinitelyBinary() {
+        finishIfNecessary();
+        return !isTextMimeType && (!isPossibleTextMimeType || (isGuessed && isFaulty));
+    }
+
+    public boolean isProbablyText() {
+        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 80f9d6368..ff9377581 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/InputDataOperation.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/InputDataOperation.java
@@ -23,13 +23,6 @@ import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
-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 java.nio.charset.UnsupportedCharsetException;
 import java.util.ArrayList;
 
 import android.content.ClipDescription;
@@ -75,14 +68,9 @@ import org.sufficientlysecure.keychain.service.input.CryptoInputParcel;
 public class InputDataOperation extends BaseOperation<InputDataParcel> {
 
     private final byte[] buf = new byte[256];
-    private final ByteBuffer bufWrap;
-    private final CharBuffer dummyOutput;
 
     public InputDataOperation(Context context, ProviderHelper providerHelper, Progressable progressable) {
         super(context, providerHelper, progressable);
-
-        bufWrap = ByteBuffer.wrap(buf);
-        dummyOutput = CharBuffer.allocate(256);
     }
 
     Uri mSignedDataUri;
@@ -338,83 +326,37 @@ public class InputDataOperation extends BaseOperation<InputDataParcel> {
                     throw new IOException("Error getting file for writing!");
                 }
 
-                boolean isPossibleTextMimeType = ClipDescription.compareMimeTypes(mimeType, "application/octet-stream")
-                        || ClipDescription.compareMimeTypes(mimeType, "application/x-download")
-                        || ClipDescription.compareMimeTypes(mimeType, "text/*");
-
                 // If this data looks like text, we pipe the incoming data into a charset
                 // decoder, to see if the data is legal for the assumed charset.
-                String charset;
-                boolean charsetIsFaulty;
-                boolean charsetIsGuessed;
-                CharsetDecoder charsetDecoder = null;
-                if (isPossibleTextMimeType) {
-                    charset = bd.getCharset();
-                    // the charset defaults to us-ascii, but we want to default to utf-8
-                    if (charset == null || "us-ascii".equals(charset)) {
-                        charset = "utf-8";
-                        charsetIsGuessed = true;
-                    } else {
-                        charsetIsGuessed = false;
-                    }
-
-                    try {
-                        charsetDecoder = Charset.forName(charset).newDecoder();
-                        charsetDecoder.onMalformedInput(CodingErrorAction.REPORT);
-                        charsetDecoder.onUnmappableCharacter(CodingErrorAction.REPORT);
-                        charsetDecoder.reset();
-                        charsetIsFaulty = false;
-                    } catch (UnsupportedCharsetException e) {
-                        charsetIsFaulty = true;
-                    }
-                } else {
-                    charsetIsFaulty = true;
-                    charsetIsGuessed = false;
-                    charset = null;
-                }
+                String charset = bd.getCharset();
+                CharsetVerifier charsetVerifier = new CharsetVerifier(buf, mimeType, charset);
 
                 int totalLength = 0;
                 do {
                     totalLength += len;
                     out.write(buf, 0, len);
-
-                    if (isPossibleTextMimeType && !charsetIsFaulty) {
-                        bufWrap.rewind();
-                        bufWrap.limit(len);
-                        dummyOutput.rewind();
-                        CoderResult result = charsetDecoder.decode(bufWrap, dummyOutput, false);
-                        if (result.isError()) {
-                            charsetIsFaulty = true;
-                        }
-                    }
+                    charsetVerifier.write(0, len);
                 } while ((len = is.read(buf)) > 0);
 
-                if (!charsetIsFaulty) {
-                    bufWrap.rewind();
-                    bufWrap.limit(0);
-                    dummyOutput.rewind();
-                    CoderResult result = charsetDecoder.decode(bufWrap, dummyOutput, true);
-                    if (result.isError()) {
-                        charsetIsFaulty = true;
-                    }
-                }
+                log.add(LogType.MSG_DATA_MIME_LENGTH, 3, Long.toString(totalLength));
 
-                if (isPossibleTextMimeType) {
-                    if (charsetIsFaulty && charsetIsGuessed) {
-                        log.add(LogType.MSG_DATA_MIME_CHARSET_UNKNOWN, 3, charset);
-                        charset = null;
-                    } else if (charsetIsFaulty) {
-                        log.add(LogType.MSG_DATA_MIME_CHARSET_FAULTY, 3, charset);
-                    } else if (charsetIsGuessed) {
-                        log.add(LogType.MSG_DATA_MIME_CHARSET_GUESS, 3, charset);
+                OpenPgpMetadata metadata;
+                if (charsetVerifier.isDefinitelyBinary()) {
+                    metadata = new OpenPgpMetadata(mFilename, mimeType, 0L, totalLength);
+                } else {
+                    if (charsetVerifier.isCharsetFaulty() && charsetVerifier.isCharsetGuessed()) {
+                        log.add(LogType.MSG_DATA_MIME_CHARSET_UNKNOWN, 3, charsetVerifier.getMaybeFaultyCharset());
+                    } else if (charsetVerifier.isCharsetFaulty()) {
+                        log.add(LogType.MSG_DATA_MIME_CHARSET_FAULTY, 3, charsetVerifier.getCharset());
+                    } else if (charsetVerifier.isCharsetGuessed()) {
+                        log.add(LogType.MSG_DATA_MIME_CHARSET_GUESS, 3, charsetVerifier.getCharset());
                     } else {
-                        log.add(LogType.MSG_DATA_MIME_CHARSET, 3, charset);
+                        log.add(LogType.MSG_DATA_MIME_CHARSET, 3, charsetVerifier.getCharset());
                     }
-                }
-
-                log.add(LogType.MSG_DATA_MIME_LENGTH, 3, Long.toString(totalLength));
 
-                OpenPgpMetadata metadata = new OpenPgpMetadata(mFilename, mimeType, 0L, totalLength, charset);
+                    metadata = new OpenPgpMetadata(mFilename, mimeType, 0L, totalLength,
+                            charsetVerifier.getCharset(), charsetVerifier.isProbablyText());
+                }
 
                 out.close();
                 outputUris.add(uri);