# BST-TIMEOUT: 1500   # 54 cases, 484s measured locally under ptest-runner -- the 60s default is nowhere near
. "$BST_LIB"

# libpng 1.6.42 (poky recipes-multimedia/libpng) -- the REFERENCE PNG library,
# the implementation every other PNG reader is measured against, ported here as
# a static library plus its own upstream test suite, which OpenEmbedded packages
# as a ptest.
#
# WHAT THIS FILE ASSERTS. The port's acceptance gate is upstream's own suite,
# run on target under ptest-runner exactly as the ticket requires: no
# interactive session, no hand-driven check. run-ptest is `cd src && make
# check-TESTS`, so what executes is automake's own test harness driving
# upstream's tests/ scripts over the five test programs -- pngtest (read/write
# round-trip), pngvalid (gamma, transform and progressive-read validation
# computed against reference arithmetic), pngstest (the simplified png_image API
# across the colour-type matrix), pngimage (transform round-trips over the
# pngsuite corpus) and pngunknown (unknown-chunk policy) -- plus pnggetset, the
# accessor round-trip the CVE-2026-34757 patch adds.
#
# WHY THAT CORPUS IS WORTH MORE THAN "THE LIBRARY LINKS": pngvalid and pngstest
# are floating-point heavy and PIXEL-EXACT. They do not ask whether libpng ran,
# they ask whether this arm's arithmetic produces the same samples as the
# reference -- so a green here is a statement about wasm32 numerics and about
# zlib's inflate/deflate underneath, not merely about syscalls.
#
# THE ORACLE IS A NATIVE x86_64 CONTROL of the identical 1.6.42 tarball with the
# identical 19-patch oe series, autoreconf'd the way autotools.bbclass does it,
# configured --disable-shared, and driven through the identical
# `make check-TESTS`. It reported TOTAL 33 / PASS 33 / FAIL 0 / SKIP 0, and its
# case list is byte-identical to the target's -- same 33 names, no case present
# on one side and absent on the other. That is what makes the target result
# classifiable rather than arguable, and it is why the per-case expectations
# below are enumerated rather than reduced to a count: a suite that silently
# stopped running pngvalid would still report a clean zero failures.
#
# (The control had to be built with autoreconf to be a control at all. Configured
# straight from the shipped Makefile.in it runs 32 cases, not 33: CVE-2026-34757
# adds pnggetset through Makefile.am, and without regenerating Makefile.in that
# hunk is inert. A 32-case control against a 33-case target would have read as a
# target anomaly when it was an artifact of how the control was built.)

ptestdir=/usr/lib/libpng/ptest
srcdir=$ptestdir/src

# The 33 cases the control ran, in its order. Enumerated so that a suite which
# quietly stops running one is a red here rather than an unnoticed absence.
PNG_CASES="pngtest-all
pnggetset
pngvalid-gamma-16-to-8
pngvalid-gamma-alpha-mode
pngvalid-gamma-background
pngvalid-gamma-expand16-alpha-mode
pngvalid-gamma-expand16-background
pngvalid-gamma-expand16-transform
pngvalid-gamma-sbit
pngvalid-gamma-threshold
pngvalid-gamma-transform
pngvalid-progressive-size
pngvalid-progressive-interlace-standard
pngvalid-transform
pngvalid-progressive-standard
pngvalid-standard
pngstest-1.8
pngstest-1.8-alpha
pngstest-linear
pngstest-linear-alpha
pngstest-none
pngstest-none-alpha
pngstest-sRGB
pngstest-sRGB-alpha
pngunknown-IDAT
pngunknown-discard
pngunknown-if-safe
pngunknown-sAPI
pngunknown-sTER
pngunknown-save
pngunknown-vpAg
pngimage-quick
pngimage-full"

# ----------------------------------------------------------------- payload ---
# check_rc with `test` is an ash builtin and forks nothing, unlike check/check_out
# whose command substitution does -- so the presence half of this file is free on
# an arm where every exec is a fresh wasm module instantiation.
check_rc libpng/lib-static 0 test -f /usr/lib/libpng16.a
check_rc libpng/header 0 test -f /usr/include/libpng16/png.h
check_rc libpng/pkgconfig 0 test -f /usr/lib/pkgconfig/libpng16.pc
check_rc libpng/ptest-runptest 0 test -x "$ptestdir/run-ptest"
check_rc libpng/ptest-makefile 0 test -f "$srcdir/Makefile"
check_rc libpng/ptest-testdir 0 test -d "$srcdir/tests"

# The six programs run-ptest drives. Named rather than counted: each one is a
# distinct third of the suite, and a missing one costs cases silently.
for b in pngtest pnggetset pngstest pngimage pngunknown pngvalid; do
  check_rc "libpng/prog-$b" 0 test -x "$srcdir/$b"
done

# libpng-tools: the shipped binaries, as opposed to the suite's own programs.
# Two, not three -- upstream's bin_PROGRAMS under ENABLE_TOOLS is exactly
# `pngfix png-fix-itxt`.
for b in pngfix png-fix-itxt; do
  check_rc "libpng/tool-$b" 0 test -x "/usr/bin/$b"
done

# pngcp is deliberately NOT expected in ${bindir}: upstream lists it in
# check_PROGRAMS, not bin_PROGRAMS, so `make install` never installs it on any
# platform. poky's FILES:${PN}-tools names it anyway -- a harmless
# over-declaration (a FILES entry matching nothing is silently ignored), but one
# worth pinning, because a reader comparing the recipe against the image would
# otherwise read its absence as a failed install on this arm. Asserted as a
# positive so that pngcp APPEARING here -- which would mean upstream moved it to
# bin_PROGRAMS -- is what turns the case red.
if [ -e /usr/bin/pngcp ]; then
  bst_notok libpng/tool-pngcp-not-installed \
    "pngcp is in /usr/bin: upstream moved it out of check_PROGRAMS, so FILES:libpng-tools is now accurate and this case should become an ordinary presence check"
else
  bst_ok libpng/tool-pngcp-not-installed
fi

# The pngsuite corpus is the fixture pngimage and pngunknown read. A short count
# means do_install_ptest's cpio step silently dropped some, which would shrink
# the suite without failing it. 51 top-level .png and a 9-file interlaced/ is
# what the native control's tree holds; the control's three non-.png entries
# (README, bad_interlace_conversions.txt) are absent here by design, because the
# recipe copies `find contrib -name '*.png'` and nothing else.
npng=$(ls "$srcdir/contrib/pngsuite"/*.png 2>/dev/null | wc -l)
if [ "$npng" -eq 51 ]; then
  bst_ok libpng/pngsuite-corpus
else
  bst_notok libpng/pngsuite-corpus "expected 51 pngsuite .png fixtures (the control's count), found $npng"
fi

nint=$(ls "$srcdir/contrib/pngsuite/interlaced"/*.png 2>/dev/null | wc -l)
if [ "$nint" -eq 9 ]; then
  bst_ok libpng/pngsuite-interlaced
else
  bst_notok libpng/pngsuite-interlaced "expected 9 interlaced .png fixtures, found $nint"
fi

# No libpng16.so on a distro that configures --disable-shared image-wide; one
# appearing here would mean the static-only rule silently stopped holding, and
# with it the reason the bbappend has to redirect do_install_ptest away from
# ${B}/.libs at all.
if [ -e /usr/lib/libpng16.so.16 ] || [ -e /usr/lib/libpng.so ]; then
  bst_notok libpng/static-only "a shared libpng shipped on a --disable-shared distro"
else
  bst_ok libpng/static-only
fi

# ------------------------------------------------- upstream's own test suite ---
# THE GATE. ptest-runner is the harness the ticket closes on. -t is set well past
# ptest-runner's own 300 s DEFAULT_TIMEOUT because the suite measures 484 s here;
# it does not bound anything on this arm anyway (relative timers do not fire,
# brintos/linux#48), so a tight value would be an assertion about nothing.
if [ ! -x /usr/bin/ptest-runner ]; then
  bst_notok libpng/ptest-suite "no ptest-runner on the image -- the suite cannot be run"
  for c in $PNG_CASES; do
    bst_notok "libpng/case-$c" "suite not run: no ptest-runner"
  done
else
  out=$(/usr/bin/ptest-runner -t 20000 libpng 2>&1)

  # Per-case verdicts, against the control's list. `case` is a builtin, so all 33
  # comparisons together cost no forks.
  for c in $PNG_CASES; do
    case "$out" in
      *"PASS: tests/$c"*) bst_ok "libpng/case-$c" ;;
      *"FAIL: tests/$c"*) bst_notok "libpng/case-$c" "upstream case failed on target; the native x86_64 control passes it" ;;
      *"SKIP: tests/$c"*) bst_notok "libpng/case-$c" "skipped on target; the native x86_64 control runs it" ;;
      *)                  bst_notok "libpng/case-$c" "case not reported at all -- the suite did not reach it" ;;
    esac
  done

  # automake's own tally, which is the number the ticket asks to be recorded.
  # Checked in addition to the per-case loop because the two fail differently: a
  # case renamed upstream shows up above, a case that vanished shows up here.
  case "$out" in
    *"# FAIL:  0"*) bst_ok libpng/suite-nofail ;;
    *)              bst_notok libpng/suite-nofail "automake reported a non-zero FAIL count" ;;
  esac
  case "$out" in
    *"# TOTAL: 33"*) bst_ok libpng/suite-total ;;
    *) bst_notok libpng/suite-total "expected automake TOTAL 33, matching the native control" ;;
  esac

  # ptest-runner's own framing: one ptest, zero failures.
  case "$out" in
    *"TOTAL: 1 FAIL: 0"*) bst_ok libpng/ptest-suite ;;
    *)                    bst_notok libpng/ptest-suite "ptest-runner did not report TOTAL: 1 FAIL: 0" ;;
  esac
fi