pdftext: extract PDF text in a re-exec'd child (sift pdftext) with a deadline

Browse Source

The parser is pure Go but a goroutine cannot be killed, so extraction runs in
a child process: the binary re-executed as `sift pdftext`, reading the PDF on
stdin and writing JSON Lines on stdout, killed at a deadline by the parent.

pdftext.go holds the types, the five errors, Extract (reader.Open with
ErrWrongPassword -> ErrEncrypted, per-page recover, trailer /Info /Title, and
rule-3 UTF-16BE/Latin-1 text decode) and ChildMain (soft 768 MiB memory limit,
-no env read, no network, exit codes 0/3/4/1). outline.go walks /Outlines ->
/First -> /Next with /First children at level+1, resolving /Dest and /GoTo /A
dests to 1-based pages, bounded at 10,000 items and never visiting an object
twice. runner.go is the Runner: env-isolated child (nil env is an empty
environment), 60 s deadline, 64 MiB output cap, 200 MiB stdin cap, stderr
capped at 4 KiB, exit-code to error mapping, and Doc parsing with ErrNoText.
cmd/sift/main.go adds the unlisted `pdftext` case. tools.go is removed; the
go-pdfkit modules stay vendored.

Co-Authored-By: ornith-1.5-35b-a3b <ornith-1.5-35b-a3b@llama.cpp.invalid>

...

This commit is contained in:

kyle

2026-09-25 22:58:05 -07:00

co-authored by ornith-1.5-35b-a3b

parent 13365a2daa

commit f57aaef59e

11 changed files with 1112 additions and 10 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download Patch File Download Diff File Expand all files Collapse all files

tests/testdata/pdf/encrypted-owner.pdf

Vendored

BIN

Binary file not shown.