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Grzegorz MartensandClaude Opus 5.5
10172d7a94
The image allowance charged a Flate stage the bytes it made, and its input only as what the stage before it made. Inflating does work for every block it reads, whether or not the block makes anything: a stream of empty fixed-Huffman blocks, ten bits each, took 1,383 ns a byte to make nothing (miniz_oxide 0.9.1, release), one of a literal each 768 ns a byte, empty dynamic blocks 106, against the 3 ns a step budget.rs states. A 250-byte stream of four Flates over empty blocks took 47 s and was charged about 34 million steps, so a review of #5698 worked out about 7 hours before a 240 KB file of them was refused, through clearing, Optimize, export, compare and redaction's images and dictionaries alike. Where decoding is paid for (decode_tolerant_within, decode_within), a Flate stage now pays FLATE_READ_WORK, 128 steps, for each byte it reads, before it runs: a stage the allowance can't pay for doesn't start. Per byte read, the worst of the shapes measured comes to about 11 ns a step at that price, inside what a JBIG2 step takes. The raw retry of a zlib header that only looked valid reads the bytes again, so it pays again, makes no more than is left once it has, and is refused when it can't be paid for. Byte counts for a byte allowance (decode_counted, decode_tolerant_counted, as a page's content uses) are unchanged. With a tiny file's allowance (2^34 steps), the 250-byte stream is decoded three times in 141 s, and the fourth stops before its last stage reads the empty blocks (8.2 ns a step, release). Data an encoder makes took 0.4 to 3.2 ns a byte it made, reading included, and each byte of a file adds 64 times the price to an operation's allowance. Tests: a_flate_stage_pays_for_what_it_reads (empty blocks: 129 steps a byte, refused a step short with nothing inflated) and a_second_reading_is_paid_for; the exact costs in filters, cos and optimize tests add what Flate reads. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01AmsdeUCdTaD72jkDw2pJKY