leonarski_fandClaude Opus 5
a7615c8778
DECTRIS Eiger firmware 1.x compressed its images with the HDF Group's plain LZ4 filter rather than bitshuffle, and files from that era are still what a repository hands you. Read-only: nothing here produces it, and the new enumerator goes last so the existing values do not move, the enum being part of the CBOR stream. The framing is the same as bitshuffle's - a 64-bit big-endian total size, a 32-bit big-endian block size in bytes, then each block prefixed by its 32-bit big-endian compressed size - so only the unshuffle step differs. Verified on a real chunk: the declared total matched width*height*4 exactly and the block walk consumed the chunk to the byte. It cannot reuse the bitshuffle path, which requires the block to be a multiple of BSHUF_BLOCKED_MULT elements: these files put the whole image in ONE block, which is not. The unsupported-filter message now names the filter it found and the ones it knows. Before, an Eiger 1.x file did not report a codec problem at all - it reached spot finding with nothing decoded and failed as "0 spots from 60 images" then "found no lattice", which reads as a crystallography failure rather than a format one. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
11 lines
553 B
C
11 lines
553 B
C
// SPDX-FileCopyrightText: 2024 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
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// SPDX-License-Identifier: GPL-3.0-only
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#pragma once
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// LZ4_NO_SHUFFLE is READ-ONLY: HDF5 filter 32004, plain LZ4 with no bit shuffle, written by DECTRIS
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// Eiger firmware 1.x. Nothing here produces it. It is last so the values of the others do not move -
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// the enum crosses the CBOR stream.
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enum class CompressionAlgorithm {BSHUF_LZ4, BSHUF_ZSTD, BSHUF_ZSTD_RLE, BSHUF_ZSTD_RLE_HUFF, NO_COMPRESSION,
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LZ4_NO_SHUFFLE};
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