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fix(crawler): budget image tail against actual sniff-prefix length

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The per-image download cap subtracted the constant SNIFF_PREFIX_BYTES (64)
from the budget instead of the bytes actually drained into the prefix.
Because the prefix loop appends whole chunks, a single ~16 KiB first chunk
fills the 64-byte sniff window in one drain, so the tail could then add
another near-full cap — storing up to ~2× max_image_bytes per page.

Capture prefix.len() before the prefix is moved into the stream and budget
the tail as `max_image_bytes - prefix_len` via a small `remaining_after_prefix`
helper (unit-tested for the overshoot and saturation cases).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
MechaCat02
2026-07-03 20:57:29 +02:00
parent a0d63ac9fd
commit 592747f1e0
4 changed files with 45 additions and 5 deletions
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backend/Cargo.lock generated
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@@ -1558,7 +1558,7 @@ checksum = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
[[package]]
name = "mangalord"
version = "0.93.3"
version = "0.93.4"
dependencies = [
"anyhow",
"argon2",