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Fix decompression of files with multiple frames.#12

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Fix decompression of files with multiple frames.#12
DiThi wants to merge 1 commit intowltsmrz:developfrom
DiThi:develop

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@DiThi DiThi commented Aug 21, 2024

Decompressing a file with more than one frame fails with the message "Destination buffer is too small". This is because ZSTD_getFrameContentSizeonly gives the size of the first frame.

The solution is to use ZSTD_findDecompressedSize. However, it is in a section of the header that is disabled when not using ZSTD_STATIC_LINKING_ONLY. To avoid having to define it I just added cdecl, so nim makes the declaration instead of just using it.

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