jdbc/src/main/java/com/orientechnologies/orient/jdbc/OrientBlob.java
private int getRelativeIndex(long pos) {
    int currentSize = 0;
    currentChunkIndex = 0;

    // loop until we find the chuks holding the given position
    while (pos >= (currentSize += binaryDataChunks.get(currentChunkIndex).length))
      currentChunkIndex++;

    currentChunk = binaryDataChunks.get(currentChunkIndex);
    currentSize -= currentChunk.length;
    // the position referred to the target binary chunk
    int relativePosition = (int) (pos - currentSize);
    // the index of the first byte to be returned
    return relativePosition - 1;
  }
private int getRelativeIndex(long pos) {
    int currentSize = 0;
    currentChunkIndex = 0;

    // loop until we find the chuks holding the given position
    while (pos >= (currentSize += binaryDataChunks.get(currentChunkIndex).length))
      currentChunkIndex++;

    currentChunk = binaryDataChunks.get(currentChunkIndex);
    currentSize -= currentChunk.length;
    // the position referred to the target binary chunk
    int relativePosition = (int) (pos - currentSize);
    // the index of the first byte to be returned
    return relativePosition - 1;
  }
Calculates the index within a binary chunk corresponding to the given absolute position within this BLOB

@param pos
@return