libbacktrace: rewrite and simplify main zstd loop

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* elf.c (ZSTD_TABLE_*): Use elf_zstd_fse_baseline_entry.
	(ZSTD_ENCODE_BASELINE_BITS): Define.
	(ZSTD_DECODE_BASELINE, ZSTD_DECODE_BASEBITS): Define.
	(elf_zstd_literal_length_base): New static const array.
	(elf_zstd_match_length_base): Likewise.
	(struct elf_zstd_fse_baseline_entry): Define.
	(elf_zstd_make_literal_baseline_fse): New static function.
	(elf_zstd_make_offset_baseline_fse): Likewise.
	(elf_zstd_make_match_baseline_fse): Likewise.
	(print_table, main): Use elf_zstd_fse_baseline_entry.
	(elf_zstd_lit_table, elf_zstd_match_table): Likewise.
	(elf_zstd_offset_table): Likewise.
	(struct elf_zstd_seq_decode): Likewise.  Remove use_rle and rle
	fields.
	(elf_zstd_unpack_seq_decode): Use elf_zstd_fse_baseline_entry,
	taking a conversion function.  Convert RLE to FSE.
	(elf_zstd_literal_length_baseline): Remove.
	(elf_zstd_literal_length_bits): Remove.
	(elf_zstd_match_length_baseline): Remove.
	(elf_zstd_match_length_bits): Remove.
	(elf_zstd_decompress): Use elf_zstd_fse_baseline_entry.  Rewrite
	and simplify main loop.

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This commit is contained in:

Ian Lance Taylor

2022-12-09 17:44:52 -08:00

parent c992dd8a9b

commit fd9442f7b5

1 changed files with 594 additions and 358 deletions

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