1 files changed, 17 insertions, 3 deletions
diff --git a/testing/fx_string_testhelpers.cpp b/testing/fx_string_testhelpers.cpp
index e2ce9353fb..e3c443ac4e 100644
--- a/testing/fx_string_testhelpers.cpp
+++ b/testing/fx_string_testhelpers.cpp
@@ -24,8 +24,22 @@ CFX_InvalidSeekableReadStream::CFX_InvalidSeekableReadStream(
 CFX_InvalidSeekableReadStream::~CFX_InvalidSeekableReadStream() = default;
 
 CFX_BufferSeekableReadStream::CFX_BufferSeekableReadStream(
-    const unsigned char* src,
-    size_t src_size)
-    : data_(src), data_size_(src_size) {}
+    pdfium::span<const uint8_t> data)
+    : data_(data) {}
 
 CFX_BufferSeekableReadStream::~CFX_BufferSeekableReadStream() = default;
+
+bool CFX_BufferSeekableReadStream::ReadBlock(void* buffer,
+                                             FX_FILESIZE offset,
+                                             size_t size) {
+  if (offset < 0 || static_cast<size_t>(offset) >= data_.size())
+    return false;
+
+  if (static_cast<size_t>(offset) + size > data_.size())
+    size = data_.size() - static_cast<size_t>(offset);
+  if (size == 0)
+    return false;
+
+  memcpy(buffer, &data_[offset], size);
+  return true;
+}