/*
 * MinIO Java SDK for Amazon S3 Compatible Cloud Storage,
 * (C) 2017 MinIO, 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.
 */

import java.io.IOException;
import java.io.InputStream;

class ContentInputStream extends InputStream {
  private static final char[] CONTENT =
      new StringBuilder()
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          .toString()
          .toCharArray();
  private long size = 0;
  private long available = 0;
  private boolean isClosed = false;
  private int pos = 0;

  public ContentInputStream(long size) {
    this.size = size;
    this.available = size;
  }

  public int available() throws IOException {
    return (int) available;
  }

  public void close() throws IOException {
    isClosed = true;
  }

  public int read() throws IOException {
    if (isClosed) {
      throw new IOException("closed stream");
    }

    if (available <= 0) {
      // Indicate EOF
      return -1;
    }

    if (pos == CONTENT.length) {
      pos = 0;
    }

    char c = CONTENT[pos];
    pos++;
    available--;

    return (int) c;
  }

  public long skip(long n) throws IOException {
    if (isClosed) {
      throw new IOException("closed stream");
    }

    if (available <= 0) {
      throw new IOException("no more data");
    }

    if (size - available < n) {
      n = size - available;
      available = 0;
    } else {
      available -= n;
    }

    return n;
  }
}