From e83cc32b14eae101920f6f99026f529fb01d27e8 Mon Sep 17 00:00:00 2001
From: Philip Searle <pr.searle@ntlworld.com>
Date: Sat, 13 Nov 2010 23:52:13 +0000
Subject: [PATCH] Add palette and odd-sized PNG unit tests. Fix loading
 interlaced PNGs < 8x8 in size.

---
 basis/images/png/png-tests.factor     |  44 ++++++++++++++++++++++++++
 basis/images/png/png.factor           |  29 ++++++++++++-----
 extra/images/testing/png/basi3p01.fig | Bin 0 -> 3131 bytes
 extra/images/testing/png/basi3p01.png | Bin 0 -> 132 bytes
 extra/images/testing/png/basi3p02.fig | Bin 0 -> 3131 bytes
 extra/images/testing/png/basi3p02.png | Bin 0 -> 193 bytes
 extra/images/testing/png/basi3p04.fig | Bin 0 -> 3131 bytes
 extra/images/testing/png/basi3p04.png | Bin 0 -> 327 bytes
 extra/images/testing/png/basi3p08.fig | Bin 0 -> 3131 bytes
 extra/images/testing/png/basi3p08.png | Bin 0 -> 1527 bytes
 extra/images/testing/png/basn3p01.fig | Bin 0 -> 3131 bytes
 extra/images/testing/png/basn3p01.png | Bin 0 -> 112 bytes
 extra/images/testing/png/basn3p02.fig | Bin 0 -> 3131 bytes
 extra/images/testing/png/basn3p02.png | Bin 0 -> 146 bytes
 extra/images/testing/png/basn3p04.fig | Bin 0 -> 3131 bytes
 extra/images/testing/png/basn3p04.png | Bin 0 -> 216 bytes
 extra/images/testing/png/basn3p08.fig | Bin 0 -> 3131 bytes
 extra/images/testing/png/basn3p08.png | Bin 0 -> 1286 bytes
 extra/images/testing/png/s01i3p01.fig | Bin 0 -> 60 bytes
 extra/images/testing/png/s01i3p01.png | Bin 0 -> 113 bytes
 extra/images/testing/png/s01n3p01.fig | Bin 0 -> 60 bytes
 extra/images/testing/png/s01n3p01.png | Bin 0 -> 113 bytes
 extra/images/testing/png/s02i3p01.fig | Bin 0 -> 69 bytes
 extra/images/testing/png/s02i3p01.png | Bin 0 -> 114 bytes
 extra/images/testing/png/s02n3p01.fig | Bin 0 -> 69 bytes
 extra/images/testing/png/s02n3p01.png | Bin 0 -> 115 bytes
 extra/images/testing/png/s03i3p01.fig | Bin 0 -> 84 bytes
 extra/images/testing/png/s03i3p01.png | Bin 0 -> 118 bytes
 extra/images/testing/png/s03n3p01.fig | Bin 0 -> 84 bytes
 extra/images/testing/png/s03n3p01.png | Bin 0 -> 120 bytes
 extra/images/testing/png/s04i3p01.fig | Bin 0 -> 105 bytes
 extra/images/testing/png/s04i3p01.png | Bin 0 -> 126 bytes
 extra/images/testing/png/s04n3p01.fig | Bin 0 -> 105 bytes
 extra/images/testing/png/s04n3p01.png | Bin 0 -> 121 bytes
 extra/images/testing/png/s05i3p02.fig | Bin 0 -> 132 bytes
 extra/images/testing/png/s05i3p02.png | Bin 0 -> 134 bytes
 extra/images/testing/png/s05n3p02.fig | Bin 0 -> 132 bytes
 extra/images/testing/png/s05n3p02.png | Bin 0 -> 129 bytes
 extra/images/testing/png/s06i3p02.fig | Bin 0 -> 165 bytes
 extra/images/testing/png/s06i3p02.png | Bin 0 -> 143 bytes
 extra/images/testing/png/s06n3p02.fig | Bin 0 -> 165 bytes
 extra/images/testing/png/s06n3p02.png | Bin 0 -> 131 bytes
 extra/images/testing/png/s07i3p02.fig | Bin 0 -> 205 bytes
 extra/images/testing/png/s07i3p02.png | Bin 0 -> 149 bytes
 extra/images/testing/png/s07n3p02.fig | Bin 0 -> 205 bytes
 extra/images/testing/png/s07n3p02.png | Bin 0 -> 138 bytes
 extra/images/testing/png/s08i3p02.fig | Bin 0 -> 250 bytes
 extra/images/testing/png/s08i3p02.png | Bin 0 -> 149 bytes
 extra/images/testing/png/s08n3p02.fig | Bin 0 -> 250 bytes
 extra/images/testing/png/s08n3p02.png | Bin 0 -> 139 bytes
 extra/images/testing/png/s09i3p02.fig | Bin 0 -> 301 bytes
 extra/images/testing/png/s09i3p02.png | Bin 0 -> 147 bytes
 extra/images/testing/png/s09n3p02.fig | Bin 0 -> 301 bytes
 extra/images/testing/png/s09n3p02.png | Bin 0 -> 143 bytes
 extra/images/testing/png/s32i3p04.fig | Bin 0 -> 3131 bytes
 extra/images/testing/png/s32i3p04.png | Bin 0 -> 355 bytes
 extra/images/testing/png/s32n3p04.fig | Bin 0 -> 3131 bytes
 extra/images/testing/png/s32n3p04.png | Bin 0 -> 263 bytes
 extra/images/testing/png/s33i3p04.fig | Bin 0 -> 3326 bytes
 extra/images/testing/png/s33i3p04.png | Bin 0 -> 385 bytes
 extra/images/testing/png/s33n3p04.fig | Bin 0 -> 3326 bytes
 extra/images/testing/png/s33n3p04.png | Bin 0 -> 329 bytes
 extra/images/testing/png/s34i3p04.fig | Bin 0 -> 3527 bytes
 extra/images/testing/png/s34i3p04.png | Bin 0 -> 349 bytes
 extra/images/testing/png/s34n3p04.fig | Bin 0 -> 3527 bytes
 extra/images/testing/png/s34n3p04.png | Bin 0 -> 248 bytes
 extra/images/testing/png/s35i3p04.fig | Bin 0 -> 3734 bytes
 extra/images/testing/png/s35i3p04.png | Bin 0 -> 399 bytes
 extra/images/testing/png/s35n3p04.fig | Bin 0 -> 3734 bytes
 extra/images/testing/png/s35n3p04.png | Bin 0 -> 338 bytes
 extra/images/testing/png/s36i3p04.fig | Bin 0 -> 3947 bytes
 extra/images/testing/png/s36i3p04.png | Bin 0 -> 356 bytes
 extra/images/testing/png/s36n3p04.fig | Bin 0 -> 3947 bytes
 extra/images/testing/png/s36n3p04.png | Bin 0 -> 258 bytes
 extra/images/testing/png/s37i3p04.fig | Bin 0 -> 4166 bytes
 extra/images/testing/png/s37i3p04.png | Bin 0 -> 393 bytes
 extra/images/testing/png/s37n3p04.fig | Bin 0 -> 4166 bytes
 extra/images/testing/png/s37n3p04.png | Bin 0 -> 336 bytes
 extra/images/testing/png/s38i3p04.fig | Bin 0 -> 4391 bytes
 extra/images/testing/png/s38i3p04.png | Bin 0 -> 357 bytes
 extra/images/testing/png/s38n3p04.fig | Bin 0 -> 4391 bytes
 extra/images/testing/png/s38n3p04.png | Bin 0 -> 245 bytes
 extra/images/testing/png/s39i3p04.fig | Bin 0 -> 4622 bytes
 extra/images/testing/png/s39i3p04.png | Bin 0 -> 420 bytes
 extra/images/testing/png/s39n3p04.fig | Bin 0 -> 4622 bytes
 extra/images/testing/png/s39n3p04.png | Bin 0 -> 352 bytes
 extra/images/testing/png/s40i3p04.fig | Bin 0 -> 4859 bytes
 extra/images/testing/png/s40i3p04.png | Bin 0 -> 357 bytes
 extra/images/testing/png/s40n3p04.fig | Bin 0 -> 4859 bytes
 extra/images/testing/png/s40n3p04.png | Bin 0 -> 256 bytes
 90 files changed, 65 insertions(+), 8 deletions(-)
 create mode 100644 extra/images/testing/png/basi3p01.fig
 create mode 100644 extra/images/testing/png/basi3p01.png
 create mode 100644 extra/images/testing/png/basi3p02.fig
 create mode 100644 extra/images/testing/png/basi3p02.png
 create mode 100644 extra/images/testing/png/basi3p04.fig
 create mode 100644 extra/images/testing/png/basi3p04.png
 create mode 100644 extra/images/testing/png/basi3p08.fig
 create mode 100644 extra/images/testing/png/basi3p08.png
 create mode 100644 extra/images/testing/png/basn3p01.fig
 create mode 100644 extra/images/testing/png/basn3p01.png
 create mode 100644 extra/images/testing/png/basn3p02.fig
 create mode 100644 extra/images/testing/png/basn3p02.png
 create mode 100644 extra/images/testing/png/basn3p04.fig
 create mode 100644 extra/images/testing/png/basn3p04.png
 create mode 100644 extra/images/testing/png/basn3p08.fig
 create mode 100644 extra/images/testing/png/basn3p08.png
 create mode 100644 extra/images/testing/png/s01i3p01.fig
 create mode 100644 extra/images/testing/png/s01i3p01.png
 create mode 100644 extra/images/testing/png/s01n3p01.fig
 create mode 100644 extra/images/testing/png/s01n3p01.png
 create mode 100644 extra/images/testing/png/s02i3p01.fig
 create mode 100644 extra/images/testing/png/s02i3p01.png
 create mode 100644 extra/images/testing/png/s02n3p01.fig
 create mode 100644 extra/images/testing/png/s02n3p01.png
 create mode 100644 extra/images/testing/png/s03i3p01.fig
 create mode 100644 extra/images/testing/png/s03i3p01.png
 create mode 100644 extra/images/testing/png/s03n3p01.fig
 create mode 100644 extra/images/testing/png/s03n3p01.png
 create mode 100644 extra/images/testing/png/s04i3p01.fig
 create mode 100644 extra/images/testing/png/s04i3p01.png
 create mode 100644 extra/images/testing/png/s04n3p01.fig
 create mode 100644 extra/images/testing/png/s04n3p01.png
 create mode 100644 extra/images/testing/png/s05i3p02.fig
 create mode 100644 extra/images/testing/png/s05i3p02.png
 create mode 100644 extra/images/testing/png/s05n3p02.fig
 create mode 100644 extra/images/testing/png/s05n3p02.png
 create mode 100644 extra/images/testing/png/s06i3p02.fig
 create mode 100644 extra/images/testing/png/s06i3p02.png
 create mode 100644 extra/images/testing/png/s06n3p02.fig
 create mode 100644 extra/images/testing/png/s06n3p02.png
 create mode 100644 extra/images/testing/png/s07i3p02.fig
 create mode 100644 extra/images/testing/png/s07i3p02.png
 create mode 100644 extra/images/testing/png/s07n3p02.fig
 create mode 100644 extra/images/testing/png/s07n3p02.png
 create mode 100644 extra/images/testing/png/s08i3p02.fig
 create mode 100644 extra/images/testing/png/s08i3p02.png
 create mode 100644 extra/images/testing/png/s08n3p02.fig
 create mode 100644 extra/images/testing/png/s08n3p02.png
 create mode 100644 extra/images/testing/png/s09i3p02.fig
 create mode 100644 extra/images/testing/png/s09i3p02.png
 create mode 100644 extra/images/testing/png/s09n3p02.fig
 create mode 100644 extra/images/testing/png/s09n3p02.png
 create mode 100644 extra/images/testing/png/s32i3p04.fig
 create mode 100644 extra/images/testing/png/s32i3p04.png
 create mode 100644 extra/images/testing/png/s32n3p04.fig
 create mode 100644 extra/images/testing/png/s32n3p04.png
 create mode 100644 extra/images/testing/png/s33i3p04.fig
 create mode 100644 extra/images/testing/png/s33i3p04.png
 create mode 100644 extra/images/testing/png/s33n3p04.fig
 create mode 100644 extra/images/testing/png/s33n3p04.png
 create mode 100644 extra/images/testing/png/s34i3p04.fig
 create mode 100644 extra/images/testing/png/s34i3p04.png
 create mode 100644 extra/images/testing/png/s34n3p04.fig
 create mode 100644 extra/images/testing/png/s34n3p04.png
 create mode 100644 extra/images/testing/png/s35i3p04.fig
 create mode 100644 extra/images/testing/png/s35i3p04.png
 create mode 100644 extra/images/testing/png/s35n3p04.fig
 create mode 100644 extra/images/testing/png/s35n3p04.png
 create mode 100644 extra/images/testing/png/s36i3p04.fig
 create mode 100644 extra/images/testing/png/s36i3p04.png
 create mode 100644 extra/images/testing/png/s36n3p04.fig
 create mode 100644 extra/images/testing/png/s36n3p04.png
 create mode 100644 extra/images/testing/png/s37i3p04.fig
 create mode 100644 extra/images/testing/png/s37i3p04.png
 create mode 100644 extra/images/testing/png/s37n3p04.fig
 create mode 100644 extra/images/testing/png/s37n3p04.png
 create mode 100644 extra/images/testing/png/s38i3p04.fig
 create mode 100644 extra/images/testing/png/s38i3p04.png
 create mode 100644 extra/images/testing/png/s38n3p04.fig
 create mode 100644 extra/images/testing/png/s38n3p04.png
 create mode 100644 extra/images/testing/png/s39i3p04.fig
 create mode 100644 extra/images/testing/png/s39i3p04.png
 create mode 100644 extra/images/testing/png/s39n3p04.fig
 create mode 100644 extra/images/testing/png/s39n3p04.png
 create mode 100644 extra/images/testing/png/s40i3p04.fig
 create mode 100644 extra/images/testing/png/s40i3p04.png
 create mode 100644 extra/images/testing/png/s40n3p04.fig
 create mode 100644 extra/images/testing/png/s40n3p04.png

diff --git a/basis/images/png/png-tests.factor b/basis/images/png/png-tests.factor
index 7edb8d753e..6e02c3311d 100644
--- a/basis/images/png/png-tests.factor
+++ b/basis/images/png/png-tests.factor
@@ -13,18 +13,62 @@ IN: images.png.tests
     "basi0g08.png" decode-test
     "basi0g16.png" decode-test
     "basi2c08.png" decode-test
+    "basi3p01.png" decode-test
+    "basi3p02.png" decode-test
+    "basi3p04.png" decode-test
+    "basi3p08.png" decode-test
     "basn0g01.png" decode-test
     "basn0g02.png" decode-test
     "basn0g04.png" decode-test
     "basn0g08.png" decode-test
     "basn0g16.png" decode-test
     "basn2c08.png" decode-test
+    "basn3p01.png" decode-test
+    "basn3p02.png" decode-test
+    "basn3p04.png" decode-test
+    "basn3p08.png" decode-test
     "basn6a08.png" decode-test
     "f00n2c08.png" decode-test
     "f01n2c08.png" decode-test
     "f02n2c08.png" decode-test
     "f03n2c08.png" decode-test
     "f04n2c08.png" decode-test
+    "s01i3p01.png" decode-test
+    "s01n3p01.png" decode-test
+    "s02i3p01.png" decode-test
+    "s02n3p01.png" decode-test
+    "s03i3p01.png" decode-test
+    "s03n3p01.png" decode-test
+    "s04i3p01.png" decode-test
+    "s04n3p01.png" decode-test
+    "s05i3p02.png" decode-test
+    "s05n3p02.png" decode-test
+    "s06i3p02.png" decode-test
+    "s06n3p02.png" decode-test
+    "s07i3p02.png" decode-test
+    "s07n3p02.png" decode-test
+    "s08i3p02.png" decode-test
+    "s08n3p02.png" decode-test
+    "s09i3p02.png" decode-test
+    "s32n3p04.png" decode-test
+    "s32i3p04.png" decode-test
+    "s33n3p04.png" decode-test
+    "s33i3p04.png" decode-test
+    "s34n3p04.png" decode-test
+    "s34i3p04.png" decode-test
+    "s35n3p04.png" decode-test
+    "s35i3p04.png" decode-test
+    "s36n3p04.png" decode-test
+    "s36i3p04.png" decode-test
+    "s37n3p04.png" decode-test
+    "s37i3p04.png" decode-test
+    "s38n3p04.png" decode-test
+    "s38i3p04.png" decode-test
+    "s39n3p04.png" decode-test
+    "s39i3p04.png" decode-test
+    "s40n3p04.png" decode-test
+    "s40i3p04.png" decode-test
+    "s07n3p02.png" decode-test
     "z00n2c08.png" decode-test
     "z03n2c08.png" decode-test
     "z06n2c08.png" decode-test
diff --git a/basis/images/png/png.factor b/basis/images/png/png.factor
index 2a77d13068..0b18b01a45 100644
--- a/basis/images/png/png.factor
+++ b/basis/images/png/png.factor
@@ -170,22 +170,35 @@ ERROR: bad-filter n ;
     byte-array bs:<msb0-bit-reader> :> bs
     loading-png width>> :> width
     loading-png height>> :> height
-
     bs loading-png width height read-scanlines ;
 
-: adam7-subimage-height ( png-height pass -- subimage-height )
-    [ starting-row nth + ] keep
-    row-increment nth /i ;
+:: adam7-subimage-height ( png-height pass -- subimage-height )
+    pass starting-row nth png-height >= [
+        0
+    ] [
+        png-height 1 -
+        pass block-height nth +
+        pass row-increment nth /i
+    ] if ;
 
-: adam7-subimage-width ( png-width pass -- subimage-width )
-    [ starting-col nth + ] keep
-    col-increment nth /i ;
+:: adam7-subimage-width ( png-width pass -- subimage-width )
+    pass starting-col nth png-width >= [
+        0
+    ] [
+        png-width 1 -
+        pass block-width nth +
+        pass col-increment nth /i
+    ] if ;
 
 :: read-adam7-subimage ( bit-reader loading-png pass -- lines )
     loading-png height>> pass adam7-subimage-height :> height
     loading-png width>> pass adam7-subimage-width :> width
 
-    bit-reader loading-png width height read-scanlines ;
+    height width * zero? [
+        B{ } clone
+    ] [
+        bit-reader loading-png width height read-scanlines
+    ] if ;
 
 :: reverse-interlace-adam7 ( byte-array loading-png -- byte-array )
     byte-array bs:<msb0-bit-reader> :> bs
diff --git a/extra/images/testing/png/basi3p01.fig b/extra/images/testing/png/basi3p01.fig
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literal 0
HcmV?d00001

diff --git a/extra/images/testing/png/s37n3p04.png b/extra/images/testing/png/s37n3p04.png
new file mode 100644
index 0000000000000000000000000000000000000000..4d3054da516a3fc671bf5d2c4a401abe6886414a
GIT binary patch
literal 336
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literal 0
HcmV?d00001

diff --git a/extra/images/testing/png/s38i3p04.fig b/extra/images/testing/png/s38i3p04.fig
new file mode 100644
index 0000000000000000000000000000000000000000..d0f4e934ef76735cfdfec5de422719047fe86e47
GIT binary patch
literal 4391
zcmeH}O=`n15QRlf(2L{{>8AUT3pmA;F8l*Z5M8FlUH23|UGJb;8NIOw9OJqjLBLvA
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literal 0
HcmV?d00001

diff --git a/extra/images/testing/png/s38i3p04.png b/extra/images/testing/png/s38i3p04.png
new file mode 100644
index 0000000000000000000000000000000000000000..a0a8a140ad7ec7f78f5b8cb398f54233e790fe7c
GIT binary patch
literal 357
zcmeAS@N?(olHy`uVBq!ia0vp^Y9P$Q%)r2?D{_Pz$YDu$^mSxlY+GRXVp=?q&s^-}
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literal 0
HcmV?d00001

diff --git a/extra/images/testing/png/s38n3p04.fig b/extra/images/testing/png/s38n3p04.fig
new file mode 100644
index 0000000000000000000000000000000000000000..d0f4e934ef76735cfdfec5de422719047fe86e47
GIT binary patch
literal 4391
zcmeH}O=`n15QRlf(2L{{>8AUT3pmA;F8l*Z5M8FlUH23|UGJb;8NIOw9OJqjLBLvA
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literal 0
HcmV?d00001

diff --git a/extra/images/testing/png/s38n3p04.png b/extra/images/testing/png/s38n3p04.png
new file mode 100644
index 0000000000000000000000000000000000000000..1233ed048e504292bef13d0a96d291914d12c858
GIT binary patch
literal 245
zcmeAS@N?(olHy`uVBq!ia0vp^Y9P$Q3?!q3zsv<vEa{HEjtq=#3k+XOiwE+Vi=8|}
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literal 0
HcmV?d00001

diff --git a/extra/images/testing/png/s39i3p04.fig b/extra/images/testing/png/s39i3p04.fig
new file mode 100644
index 0000000000000000000000000000000000000000..a80180579602545eaf213900b2aaecefbce356c4
GIT binary patch
literal 4622
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literal 0
HcmV?d00001

diff --git a/extra/images/testing/png/s39i3p04.png b/extra/images/testing/png/s39i3p04.png
new file mode 100644
index 0000000000000000000000000000000000000000..04fee93eae400e745534756b48f5420cbe4a1d91
GIT binary patch
literal 420
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literal 0
HcmV?d00001

diff --git a/extra/images/testing/png/s39n3p04.fig b/extra/images/testing/png/s39n3p04.fig
new file mode 100644
index 0000000000000000000000000000000000000000..a80180579602545eaf213900b2aaecefbce356c4
GIT binary patch
literal 4622
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literal 0
HcmV?d00001

diff --git a/extra/images/testing/png/s39n3p04.png b/extra/images/testing/png/s39n3p04.png
new file mode 100644
index 0000000000000000000000000000000000000000..c750100d55fbd07d216bcc5af538a83b9f7772a3
GIT binary patch
literal 352
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literal 0
HcmV?d00001

diff --git a/extra/images/testing/png/s40i3p04.fig b/extra/images/testing/png/s40i3p04.fig
new file mode 100644
index 0000000000000000000000000000000000000000..5b0959580ca4e87939c32986a6aefbf847e2dab1
GIT binary patch
literal 4859
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literal 0
HcmV?d00001

diff --git a/extra/images/testing/png/s40i3p04.png b/extra/images/testing/png/s40i3p04.png
new file mode 100644
index 0000000000000000000000000000000000000000..68f358b822b92784fe065e4656061443a63795e1
GIT binary patch
literal 357
zcmeAS@N?(olHy`uVBq!ia0vp^8X(NV%)r3Nd41{$AcrO0(btiIv2B6ji)rydK69~?
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literal 0
HcmV?d00001

diff --git a/extra/images/testing/png/s40n3p04.fig b/extra/images/testing/png/s40n3p04.fig
new file mode 100644
index 0000000000000000000000000000000000000000..5b0959580ca4e87939c32986a6aefbf847e2dab1
GIT binary patch
literal 4859
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literal 0
HcmV?d00001

diff --git a/extra/images/testing/png/s40n3p04.png b/extra/images/testing/png/s40n3p04.png
new file mode 100644
index 0000000000000000000000000000000000000000..864b6b9673b3b331f2956ad2299b7854210cdb41
GIT binary patch
literal 256
zcmeAS@N?(olHy`uVBq!ia0vp^8X(NV3?%C=ER6$FEa{HEjtq=#3k+XOiwE+Vi=8|}
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literal 0
HcmV?d00001