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PSAR: don't decrypt entries a filter is going to reject

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Decrypting an entry's contents is by far the most expensive part of
walking an archive, and it happened for every entry before the filter
was even consulted. Now it waits until entryData()/entryCompression()
asks, so pulling just the fonts out of an updater no longer costs a
full firmware decrypt. Records are decrypted independently of each
other, so deferring one is safe.

Unpacking fonts from a 3.11 updater goes 0.365s -> 0.133s; a full
unpack is unchanged and produces identical output. The compression
counts now describe the entries we actually decoded rather than
everything in the archive.

Also adds --unpack-updater-filter to headless, which is how the above
was measured.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JvJR8oJNSCimCM9KXVLjfq
This commit is contained in:
Henrik Rydgård
2026-09-04 18:35:07 -06:00
co-authored by Claude Opus 5
parent a641305c75
commit 111f01481c
4 changed files with 56 additions and 22 deletions
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Core/CmdLine.cpp
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@@ -209,6 +209,7 @@ static const CommandLineParam g_autoParams[] = {
{POFF(mountIso), CmdParamType::String, "mount", 'm', "Mount ISO/CSO on umd1:", CmdLineMode::Headless},
{POFF(unpackUpdater), CmdParamType::String, "unpack-updater", '\0', "Unpack the firmware in an updater EBOOT.PBP into DIR and exit", CmdLineMode::Headless},
{POFF(unpackUpdaterModel), CmdParamType::String, "unpack-updater-model", '\0', "PSP model to unpack for (01g..12g, default any)", CmdLineMode::Headless},
{POFF(unpackUpdaterFilter), CmdParamType::String, "unpack-updater-filter", '\0', "Only unpack entries under this path, e.g. flash0:/font/", CmdLineMode::Headless},
{POFF(odsLog), CmdParamType::Bool, "odslog", 'o', "Also log through OutputDebugString (Windows)", CmdLineMode::Headless},
{POFF(generateInterpreterDispatch), CmdParamType::Bool, "generate-interpreter-dispatch", '\0', "Generate C++ interpreter dispatch code (ExecInstruction) to stdout and exit", CmdLineMode::Headless},
{POFF(resolutionScale), CmdParamType::Int, "resolution-scale", '\0', "Set the resolution scale factor"},