Import Cronet version 108.0.5359.128

Project import generated by Copybara.

FolderOrigin-RevId: /tmp/copybara-origin/src
Test: none
Change-Id: I98ebcd5784650764c7cd70ab175dd4e1cc790dff

1 files changed, 147 insertions, 0 deletions

diff --git a/base/big_endian.h b/base/big_endian.h
new file mode 100644
index 000000000..c8a1dcfde
--- /dev/null
+++ b/base/big_endian.h
@@ -0,0 +1,147 @@
+// Copyright 2014 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_BIG_ENDIAN_H_
+#define BASE_BIG_ENDIAN_H_
+
+#include <stddef.h>
+#include <stdint.h>
+#include <type_traits>
+
+#include "base/base_export.h"
+#include "base/containers/span.h"
+#include "base/memory/raw_ptr.h"
+#include "base/strings/string_piece.h"
+
+namespace base {
+
+// Read an integer (signed or unsigned) from |buf| in Big Endian order.
+// Note: this loop is unrolled with -O1 and above.
+// NOTE(szym): glibc dns-canon.c use ntohs(*(uint16_t*)ptr) which is
+// potentially unaligned.
+// This would cause SIGBUS on ARMv5 or earlier and ARMv6-M.
+template <typename T>
+inline void ReadBigEndian(const uint8_t buf[], T* out) {
+  static_assert(std::is_integral<T>::value, "T has to be an integral type.");
+  // Make an unsigned version of the output type to make shift possible
+  // without UB.
+  typename std::make_unsigned<T>::type unsigned_result = buf[0];
+  for (size_t i = 1; i < sizeof(T); ++i) {
+    unsigned_result <<= 8;
+    // Must cast to uint8_t to avoid clobbering by sign extension.
+    unsigned_result |= buf[i];
+  }
+  *out = unsigned_result;
+}
+
+// Write an integer (signed or unsigned) |val| to |buf| in Big Endian order.
+// Note: this loop is unrolled with -O1 and above.
+template<typename T>
+inline void WriteBigEndian(char buf[], T val) {
+  static_assert(std::is_integral<T>::value, "T has to be an integral type.");
+  auto unsigned_val = static_cast<typename std::make_unsigned<T>::type>(val);
+  for (size_t i = 0; i < sizeof(T); ++i) {
+    buf[sizeof(T) - i - 1] = static_cast<char>(unsigned_val & 0xFF);
+    unsigned_val >>= 8;
+  }
+}
+
+// Specializations to make clang happy about the (dead code) shifts above.
+template <>
+inline void ReadBigEndian<uint8_t>(const uint8_t buf[], uint8_t* out) {
+  *out = buf[0];
+}
+
+template <>
+inline void WriteBigEndian<uint8_t>(char buf[], uint8_t val) {
+  buf[0] = static_cast<char>(val);
+}
+
+template <>
+inline void ReadBigEndian<int8_t>(const uint8_t buf[], int8_t* out) {
+  *out = static_cast<int8_t>(buf[0]);
+}
+
+template <>
+inline void WriteBigEndian<int8_t>(char buf[], int8_t val) {
+  buf[0] = static_cast<char>(val);
+}
+
+// Allows reading integers in network order (big endian) while iterating over
+// an underlying buffer. All the reading functions advance the internal pointer.
+class BASE_EXPORT BigEndianReader {
+ public:
+  static BigEndianReader FromStringPiece(base::StringPiece string_piece);
+
+  BigEndianReader(const uint8_t* buf, size_t len);
+  explicit BigEndianReader(base::span<const uint8_t> buf);
+
+  const uint8_t* ptr() const { return ptr_; }
+  size_t remaining() const { return static_cast<size_t>(end_ - ptr_); }
+
+  bool Skip(size_t len);
+  bool ReadBytes(void* out, size_t len);
+  // Creates a StringPiece in |out| that points to the underlying buffer.
+  bool ReadPiece(base::StringPiece* out, size_t len);
+  bool ReadSpan(base::span<const uint8_t>* out, size_t len);
+
+  bool ReadU8(uint8_t* value);
+  bool ReadU16(uint16_t* value);
+  bool ReadU32(uint32_t* value);
+  bool ReadU64(uint64_t* value);
+
+  // Reads a length-prefixed region:
+  // 1. reads a big-endian length L from the buffer;
+  // 2. sets |*out| to a StringPiece over the next L many bytes
+  // of the buffer (beyond the end of the bytes encoding the length); and
+  // 3. skips the main reader past this L-byte substring.
+  //
+  // Fails if reading a U8 or U16 fails, or if the parsed length is greater
+  // than the number of bytes remaining in the stream.
+  //
+  // On failure, leaves the stream at the same position
+  // as before the call.
+  bool ReadU8LengthPrefixed(base::StringPiece* out);
+  bool ReadU16LengthPrefixed(base::StringPiece* out);
+
+ private:
+  // Hidden to promote type safety.
+  template<typename T>
+  bool Read(T* v);
+  template <typename T>
+  bool ReadLengthPrefixed(base::StringPiece* out);
+
+  const uint8_t* ptr_;
+  const uint8_t* end_;
+};
+
+// Allows writing integers in network order (big endian) while iterating over
+// an underlying buffer. All the writing functions advance the internal pointer.
+class BASE_EXPORT BigEndianWriter {
+ public:
+  BigEndianWriter(char* buf, size_t len);
+
+  char* ptr() const { return ptr_; }
+  size_t remaining() const { return static_cast<size_t>(end_ - ptr_); }
+
+  bool Skip(size_t len);
+  bool WriteBytes(const void* buf, size_t len);
+  bool WriteU8(uint8_t value);
+  bool WriteU16(uint16_t value);
+  bool WriteU32(uint32_t value);
+  bool WriteU64(uint64_t value);
+
+ private:
+  // Hidden to promote type safety.
+  template<typename T>
+  bool Write(T v);
+
+  // TODO(crbug.com/1298696): Breaks net_unittests.
+  raw_ptr<char, DegradeToNoOpWhenMTE> ptr_;
+  raw_ptr<char, DegradeToNoOpWhenMTE> end_;
+};
+
+}  // namespace base
+
+#endif  // BASE_BIG_ENDIAN_H_