ZSTD_did_fieldSize 198 lib/zstd/decompress.c return ZSTD_frameHeaderSize_prefix + !singleSegment + ZSTD_did_fieldSize[dictID] + ZSTD_fcs_fieldSize[fcsId] + (singleSegment && !fcsId); ZSTD_did_fieldSize 83 lib/zstd/zstd_internal.h static const size_t ZSTD_did_fieldSize[4] = {0, 1, 2, 4};