1 files changed, 157 insertions, 0 deletions
diff --git a/mobile/android/thirdparty/com/squareup/picasso/MarkableInputStream.java b/mobile/android/thirdparty/com/squareup/picasso/MarkableInputStream.java
new file mode 100644
index 0000000000..17043a1b03
--- /dev/null
+++ b/mobile/android/thirdparty/com/squareup/picasso/MarkableInputStream.java
@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) 2013 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.squareup.picasso;
+
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * An input stream wrapper that supports unlimited independent cursors for
+ * marking and resetting. Each cursor is a token, and it's the caller's
+ * responsibility to keep track of these.
+ */
+final class MarkableInputStream extends InputStream {
+  private final InputStream in;
+
+  private long offset;
+  private long reset;
+  private long limit;
+
+  private long defaultMark = -1;
+
+  public MarkableInputStream(InputStream in) {
+    if (!in.markSupported()) {
+      in = new BufferedInputStream(in);
+    }
+    this.in = in;
+  }
+
+  /** Marks this place in the stream so we can reset back to it later. */
+  @Override public void mark(int readLimit) {
+    defaultMark = savePosition(readLimit);
+  }
+
+  /**
+   * Returns an opaque token representing the current position in the stream.
+   * Call {@link #reset(long)} to return to this position in the stream later.
+   * It is an error to call {@link #reset(long)} after consuming more than
+   * {@code readLimit} bytes from this stream.
+   */
+  public long savePosition(int readLimit) {
+    long offsetLimit = offset + readLimit;
+    if (limit < offsetLimit) {
+      setLimit(offsetLimit);
+    }
+    return offset;
+  }
+
+  /**
+   * Makes sure that the underlying stream can backtrack the full range from
+   * {@code reset} thru {@code limit}. Since we can't call {@code mark()}
+   * without also adjusting the reset-to-position on the underlying stream this
+   * method resets first and then marks the union of the two byte ranges. On
+   * buffered streams this additional cursor motion shouldn't result in any
+   * additional I/O.
+   */
+  private void setLimit(long limit) {
+    try {
+      if (reset < offset && offset <= this.limit) {
+        in.reset();
+        in.mark((int) (limit - reset));
+        skip(reset, offset);
+      } else {
+        reset = offset;
+        in.mark((int) (limit - offset));
+      }
+      this.limit = limit;
+    } catch (IOException e) {
+      throw new IllegalStateException("Unable to mark: " + e);
+    }
+  }
+
+  /** Resets the stream to the most recent {@link #mark mark}. */
+  @Override public void reset() throws IOException {
+    reset(defaultMark);
+  }
+
+  /** Resets the stream to the position recorded by {@code token}. */
+  public void reset(long token) throws IOException {
+    if (offset > limit || token < reset) {
+      throw new IOException("Cannot reset");
+    }
+    in.reset();
+    skip(reset, token);
+    offset = token;
+  }
+
+  /** Skips {@code target - current} bytes and returns. */
+  private void skip(long current, long target) throws IOException {
+    while (current < target) {
+      long skipped = in.skip(target - current);
+      if (skipped == 0) {
+        if (read() == -1) {
+          break; // EOF
+        } else {
+          skipped = 1;
+        }
+      }
+      current += skipped;
+    }
+  }
+
+  @Override public int read() throws IOException {
+    int result = in.read();
+    if (result != -1) {
+      offset++;
+    }
+    return result;
+  }
+
+  @Override public int read(byte[] buffer) throws IOException {
+    int count = in.read(buffer);
+    if (count != -1) {
+      offset += count;
+    }
+    return count;
+  }
+
+  @Override public int read(byte[] buffer, int offset, int length) throws IOException {
+    int count = in.read(buffer, offset, length);
+    if (count != -1) {
+      this.offset += count;
+    }
+    return count;
+  }
+
+  @Override public long skip(long byteCount) throws IOException {
+    long skipped = in.skip(byteCount);
+    offset += skipped;
+    return skipped;
+  }
+
+  @Override public int available() throws IOException {
+    return in.available();
+  }
+
+  @Override public void close() throws IOException {
+    in.close();
+  }
+
+  @Override public boolean markSupported() {
+    return in.markSupported();
+  }
+}