Add a test for a non-embedded font with illegal CIDToGIDMap string.
The PDF Reference, Sixth Edition, specifies that a CIDToGIDMap "may
appear only in a Type 2 CIDFont whose associated True Type font
program is embedded in the PDF file" (Section 5.6, pp 437). But some
PDFs, which use Type 2 CIDFont, contain CIDToGIDMap as string
"Identity" even when the font is not embedded.
This CL adds a test case with the incorrect rendering suppressed.
PDFium is rendering CID <0004> as unicode <0041> ('A') by looking up
ToUnicode mapping and ignoring the illegal CIDToGIDMap, while the
expected result should be '!' (glyph index = 4) because it follows
the rule that when CIDToGIDMap's value is "Identity", glyph index
should be the same as charcode.
Bug: chromium:1021762
Change-Id: If9dd2cb8ff03142a39ca86076e72f75f281ec747
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/62593
Commit-Queue: Hui Yingst <nigi@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
diff --git a/testing/SUPPRESSIONS b/testing/SUPPRESSIONS
index cb8b37d..36d4d2b 100644
--- a/testing/SUPPRESSIONS
+++ b/testing/SUPPRESSIONS
@@ -337,6 +337,9 @@
# TODO(chromium:1012369): Remove after associated bug is fixed
bug_1012369.in * * *
+# TODO(chromium:1021762): Remove after associated bug is fixed
+bug_1021762.in * * *
+
# xfa_specific
# TODO(pdfium:1107): Remove after associated bug is fixed
diff --git a/testing/resources/pixel/bug_1021762.in b/testing/resources/pixel/bug_1021762.in
new file mode 100644
index 0000000..a8f7be4
--- /dev/null
+++ b/testing/resources/pixel/bug_1021762.in
@@ -0,0 +1,101 @@
+{{header}}
+{{object 1 0}} <<
+ /Type /Catalog
+ /Pages 2 0 R
+>>
+endobj
+{{object 2 0}} <<
+ /Type /Pages
+ /Count 1
+ /Kids [3 0 R]
+>>
+endobj
+{{object 3 0}} <<
+ /Type /Page
+ /Parent 2 0 R
+ /Contents 4 0 R
+ /Resources <<
+ /ProcSet [/PDF /Text]
+ /Font <<
+ /Ft11 5 0 R
+ >>
+ >>
+ /MediaBox [0 0 100 100]
+>>
+endobj
+{{object 4 0}} <<
+ {{streamlen}}
+>>
+stream
+0 0 0 rg
+BT
+/Ft11 20 Tf
+1 0 0 1 40 40 Tm
+<0004>Tj
+ET
+endstream
+endobj
+{{object 5 0}} <<
+ /Type /Font
+ /Subtype /Type0
+ /BaseFont /Arial-BoldMT
+ /Encoding /Identity-H
+ /ToUnicode 8 0 R
+ /DescendantFonts [6 0 R]
+>>
+endobj
+{{object 6 0}} <<
+ /Type /Font
+ /Subtype /CIDFontType2
+ /BaseFont /Arial-BoldMT
+ /CIDToGIDMap /Identity
+ /CIDSystemInfo <<
+ /Registry (Adobe)
+ /Ordering (Identity)
+ /Supplement 0
+ >>
+ /FontDescriptor 7 0 R
+>>
+endobj
+{{object 7 0}} <<
+ /Type /FontDescriptor
+ /FontName /Arial-BoldMT
+ /Descent -211.914063
+ /Ascent 905.273438
+ /CapHeight 905.273438
+ /StemV 1
+ /Flags 32
+ /ItalicAngle 0
+ /FontBBox [-627.929688 -376.464844 2000.000000 1055.664063]
+>>
+endobj
+{{object 8 0}} <<
+ {{streamlen}}
+>>
+stream
+/CIDInit /ProcSet findresource begin
+10000 dict begin
+begincmap
+/CIDSystemInfo <<
+/Registry (Adobe)
+/Ordering (UCS)
+/Supplement 0
+>> def
+/CMapName /Adobe-Identity-UCS def
+/CMapType 2 def
+1 begincodespacerange
+<0000> <FFFF>
+endcodespacerange
+99 beginbfrange
+<0004> <0004> [ <0041> ]
+endbfrange
+endcmap
+CMapName currentdict /CMap defineresource pop
+end
+end
+endstream
+endobj
+{{xref}}
+{{trailer}}
+{{startxref}}
+%%EOF
diff --git a/testing/resources/pixel/bug_1021762_expected.pdf.0.png b/testing/resources/pixel/bug_1021762_expected.pdf.0.png
new file mode 100644
index 0000000..8ba763c
--- /dev/null
+++ b/testing/resources/pixel/bug_1021762_expected.pdf.0.png
Binary files differ
