Add FPDFSignatureObj_GetContents() API
This follows the same pattern as FPDFTextObj_GetFontName(), so the
client has to call this function twice, but allocation of the buffer
happens outside pdfium.
Change-Id: Iafc1a19dfcb81c9c7b34571ac17cc77f7d9b5da9
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/71470
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/fpdfsdk/fpdf_signature_embeddertest.cpp b/fpdfsdk/fpdf_signature_embeddertest.cpp
index 851df00..3face6e 100644
--- a/fpdfsdk/fpdf_signature_embeddertest.cpp
+++ b/fpdfsdk/fpdf_signature_embeddertest.cpp
@@ -36,3 +36,32 @@
// Provide no document.
EXPECT_EQ(nullptr, FPDF_GetSignatureObject(nullptr, 0));
}
+
+TEST_F(FPDFSignatureEmbedderTest, GetContents) {
+ EXPECT_TRUE(OpenDocument("two_signatures.pdf"));
+ FPDF_SIGNATURE signature = FPDF_GetSignatureObject(document(), 0);
+ EXPECT_NE(nullptr, signature);
+
+ // FPDFSignatureObj_GetContents() positive testing.
+ unsigned long size = FPDFSignatureObj_GetContents(signature, nullptr, 0);
+ const uint8_t kExpectedContents[] = {0x30, 0x80, 0x06, 0x09, 0x2A, 0x86, 0x48,
+ 0x86, 0xF7, 0x0D, 0x01, 0x07, 0x02, 0xA0,
+ 0x80, 0x30, 0x80, 0x02, 0x01, 0x01};
+ ASSERT_EQ(sizeof(kExpectedContents), size);
+ std::vector<char> contents(size);
+ ASSERT_EQ(size,
+ FPDFSignatureObj_GetContents(signature, contents.data(), size));
+ ASSERT_EQ(0, memcmp(kExpectedContents, contents.data(), size));
+
+ // FPDFSignatureObj_GetContents() negative testing.
+ ASSERT_EQ(0U, FPDFSignatureObj_GetContents(nullptr, nullptr, 0));
+
+ contents.resize(2);
+ contents[0] = 'x';
+ contents[1] = '\0';
+ size =
+ FPDFSignatureObj_GetContents(signature, contents.data(), contents.size());
+ ASSERT_EQ(sizeof(kExpectedContents), size);
+ EXPECT_EQ('x', contents[0]);
+ EXPECT_EQ('\0', contents[1]);
+}
