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diff --git a/third_party/image_io/includes/image_io/base/types.h b/third_party/image_io/includes/image_io/base/types.h
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+++ b/third_party/image_io/includes/image_io/base/types.h
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+#ifndef IMAGE_IO_BASE_TYPES_H_  // NOLINT
+#define IMAGE_IO_BASE_TYPES_H_  // NOLINT
+
+#include <cstdint>
+#include <cstdlib>
+
+namespace photos_editing_formats {
+namespace image_io {
+
+/// The various integer and byte types used in this package.
+using Byte = std::uint8_t;
+using Int32 = std::int32_t;
+using Int64 = std::int64_t;
+using UInt8 = std::uint8_t;
+using UInt16 = std::uint16_t;
+using UInt32 = std::uint32_t;
+using UInt64 = std::uint64_t;
+
+/// A Byte value and a validity flag.
+struct ValidatedByte {
+  explicit ValidatedByte(Byte value_arg) : value(value_arg), is_valid(true) {}
+  ValidatedByte(const ValidatedByte&) = default;
+  ValidatedByte& operator=(const ValidatedByte&) = default;
+  Byte value;
+  bool is_valid;
+};
+
+/// Equality operator for ValidatedByte
+inline bool operator==(const ValidatedByte& lhs, const ValidatedByte& rhs) {
+  return lhs.value == rhs.value && lhs.is_valid == rhs.is_valid;
+}
+
+/// Inquality operator for ValidatedByte
+inline bool operator!=(const ValidatedByte& lhs, const ValidatedByte& rhs) {
+  return lhs.value != rhs.value || lhs.is_valid != rhs.is_valid;
+}
+
+/// @return a validated byte that has a false is_valid value.
+inline ValidatedByte InvalidByte() {
+  ValidatedByte invalid_byte(0);
+  invalid_byte.is_valid = false;
+  return invalid_byte;
+}
+
+}  // namespace image_io
+}  // namespace photos_editing_formats
+
+#endif // IMAGE_IO_BASE_TYPES_H_  // NOLINT