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diff --git a/lib/jxl/base/common.h b/lib/jxl/base/common.h
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+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#ifndef LIB_JXL_BASE_COMMON_H_
+#define LIB_JXL_BASE_COMMON_H_
+
+// Shared constants and helper functions.
+
+#include <cstddef>
+#include <cstdint>
+#include <cstdio>
+#include <memory>
+#include <string>
+
+#include "lib/jxl/base/compiler_specific.h"
+
+namespace jxl {
+// Some enums and typedefs used by more than one header file.
+
+constexpr size_t kBitsPerByte = 8;  // more clear than CHAR_BIT
+
+constexpr inline size_t RoundUpBitsToByteMultiple(size_t bits) {
+  return (bits + 7) & ~size_t(7);
+}
+
+constexpr inline size_t RoundUpToBlockDim(size_t dim) {
+  return (dim + 7) & ~size_t(7);
+}
+
+static inline bool JXL_MAYBE_UNUSED SafeAdd(const uint64_t a, const uint64_t b,
+                                            uint64_t& sum) {
+  sum = a + b;
+  return sum >= a;  // no need to check b - either sum >= both or < both.
+}
+
+template <typename T1, typename T2>
+constexpr inline T1 DivCeil(T1 a, T2 b) {
+  return (a + b - 1) / b;
+}
+
+// Works for any `align`; if a power of two, compiler emits ADD+AND.
+constexpr inline size_t RoundUpTo(size_t what, size_t align) {
+  return DivCeil(what, align) * align;
+}
+
+constexpr double kPi = 3.14159265358979323846264338327950288;
+
+// Reasonable default for sRGB, matches common monitors. We map white to this
+// many nits (cd/m^2) by default. Butteraugli was tuned for 250 nits, which is
+// very close.
+// NB: This constant is not very "base", but it is shared between modules.
+static constexpr float kDefaultIntensityTarget = 255;
+
+template <typename T>
+constexpr T Pi(T multiplier) {
+  return static_cast<T>(multiplier * kPi);
+}
+
+// Prior to C++14 (i.e. C++11): provide our own make_unique
+#if __cplusplus < 201402L
+template <typename T, typename... Args>
+std::unique_ptr<T> make_unique(Args&&... args) {
+  return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
+}
+#else
+using std::make_unique;
+#endif
+
+template <typename T>
+JXL_INLINE T Clamp1(T val, T low, T hi) {
+  return val < low ? low : val > hi ? hi : val;
+}
+
+// conversion from integer to string.
+template <typename T>
+std::string ToString(T n) {
+  char data[32] = {};
+  if (T(0.1) != T(0)) {
+    // float
+    snprintf(data, sizeof(data), "%g", static_cast<double>(n));
+  } else if (T(-1) > T(0)) {
+    // unsigned
+    snprintf(data, sizeof(data), "%llu", static_cast<unsigned long long>(n));
+  } else {
+    // signed
+    snprintf(data, sizeof(data), "%lld", static_cast<long long>(n));
+  }
+  return data;
+}
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_BASE_COMMON_H_