Abstract: A processor-implemented method of decoding computer-readable data from a tag-based data format having a big tag size and a small tag size is provided. Decoding includes: reading the next tag in the received input, the tag including information about a tag size, a literal length, a literal, a copy length, and a copy offset; processing the read tag to determine whether the tag size; and reading the information about the literal length, copy length, and copy offset from the tag based on the determined tag size. Decoding includes processing the literal by writing information representing the literal to output representing the decoded computer-readable data. Decoding also includes processing copy data included in the tag based on the copy length and the copy offset. A data read point for the input and a data write point for the output may be advanced appropriately during or after literal and copy processing.