2.1.2 Window Size

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The sliding window size MUST be a power of 2, from 2^17 (128 kilobytes (KB)) up to 2^25 (32 megabytes (MB)). The window size is not stored in the compressed data stream and MUST be specified to the decoder before decoding begins. The window size SHOULD be the smallest power of two between 2^17 and 2^25 that is greater than or equal to the sum of the size of the reference data rounded up to a multiple of 32,768 and the size of the subject data.