Fix rotationschromium/3086chromium/3085

Normalize rotations read from PDF documents. Make FPDFPage_GetRotation
always return a value 0 to 3 as specified in fpdf_edit.h instead of
returning the page rotation / 90 (page rotation may be negative for some
PDFs).

BUG=chromium:713197

Change-Id: Ie477803f7d298b777a3ace89b21cfda8b7f6808b
Reviewed-on: https://pdfium-review.googlesource.com/4532
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

2 files changed, 61 insertions, 0 deletions

diff --git a/testing/resources/bug_713197.in b/testing/resources/bug_713197.in
new file mode 100644
index 0000000000..49eaee2d93
--- /dev/null
+++ b/testing/resources/bug_713197.in
@@ -0,0 +1,27 @@
+{{header}}

+{{object 1 0}} <<

+  /Type /Catalog

+  /Pages 2 0 R

+>>

+endobj

+{{object 2 0}}<<

+  /Type /Pages

+  /MediaBox [0 0 600 800]

+  /Count 1

+  /Kids [ 3 0 R ]

+>>

+endobj

+{{object 3 0}}<<

+  /Type /Page

+  /Parent 2 0 R

+  /Resources <<>>

+  /Rotate -90

+>>

+endobj

+{{xref}}

+trailer <<

+  /Size 4

+  /Root 1 0 R

+>>

+{{startxref}}

+%%EOF

diff --git a/testing/resources/bug_713197.pdf b/testing/resources/bug_713197.pdf
new file mode 100644
index 0000000000..571cde9d7f
--- /dev/null
+++ b/testing/resources/bug_713197.pdf
@@ -0,0 +1,34 @@
+%PDF-1.7
+% ò¤ô

+1 0 obj <<

+  /Type /Catalog

+  /Pages 2 0 R

+>>

+endobj

+2 0 obj<<

+  /Type /Pages

+  /MediaBox [0 0 600 800]

+  /Count 1

+  /Kids [ 3 0 R ]

+>>

+endobj

+3 0 obj<<

+  /Type /Page

+  /Parent 2 0 R

+  /Resources <<>>

+  /Rotate -90

+>>

+endobj

+xref
+0 4
+0000000000 65535 f 
+0000000016 00000 n 
+0000000074 00000 n 
+0000000171 00000 n 
+trailer <<

+  /Size 4

+  /Root 1 0 R

+>>

+startxref
+260

+%%EOF