Move base to DEPS

base/strings/utf_string_conversion_utils.cc

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/strings/utf_string_conversion_utils.h"
-
-#include "base/third_party/icu/icu_utf.h"
-
-namespace base {
-
-// ReadUnicodeCharacter --------------------------------------------------------
-
-bool ReadUnicodeCharacter(const char* src,
-                          int32 src_len,
-                          int32* char_index,
-                          uint32* code_point_out) {
-  // U8_NEXT expects to be able to use -1 to signal an error, so we must
-  // use a signed type for code_point.  But this function returns false
-  // on error anyway, so code_point_out is unsigned.
-  int32 code_point;
-  CBU8_NEXT(src, *char_index, src_len, code_point);
-  *code_point_out = static_cast<uint32>(code_point);
-
-  // The ICU macro above moves to the next char, we want to point to the last
-  // char consumed.
-  (*char_index)--;
-
-  // Validate the decoded value.
-  return IsValidCodepoint(code_point);
-}
-
-bool ReadUnicodeCharacter(const char16* src,
-                          int32 src_len,
-                          int32* char_index,
-                          uint32* code_point) {
-  if (CBU16_IS_SURROGATE(src[*char_index])) {
-    if (!CBU16_IS_SURROGATE_LEAD(src[*char_index]) ||
-        *char_index + 1 >= src_len ||
-        !CBU16_IS_TRAIL(src[*char_index + 1])) {
-      // Invalid surrogate pair.
-      return false;
-    }
-
-    // Valid surrogate pair.
-    *code_point = CBU16_GET_SUPPLEMENTARY(src[*char_index],
-                                          src[*char_index + 1]);
-    (*char_index)++;
-  } else {
-    // Not a surrogate, just one 16-bit word.
-    *code_point = src[*char_index];
-  }
-
-  return IsValidCodepoint(*code_point);
-}
-
-#if defined(WCHAR_T_IS_UTF32)
-bool ReadUnicodeCharacter(const wchar_t* src,
-                          int32 src_len,
-                          int32* char_index,
-                          uint32* code_point) {
-  // Conversion is easy since the source is 32-bit.
-  *code_point = src[*char_index];
-
-  // Validate the value.
-  return IsValidCodepoint(*code_point);
-}
-#endif  // defined(WCHAR_T_IS_UTF32)
-
-// WriteUnicodeCharacter -------------------------------------------------------
-
-size_t WriteUnicodeCharacter(uint32 code_point, std::string* output) {
-  if (code_point <= 0x7f) {
-    // Fast path the common case of one byte.
-    output->push_back(static_cast<char>(code_point));
-    return 1;
-  }
-
-
-  // CBU8_APPEND_UNSAFE can append up to 4 bytes.
-  size_t char_offset = output->length();
-  size_t original_char_offset = char_offset;
-  output->resize(char_offset + CBU8_MAX_LENGTH);
-
-  CBU8_APPEND_UNSAFE(&(*output)[0], char_offset, code_point);
-
-  // CBU8_APPEND_UNSAFE will advance our pointer past the inserted character, so
-  // it will represent the new length of the string.
-  output->resize(char_offset);
-  return char_offset - original_char_offset;
-}
-
-size_t WriteUnicodeCharacter(uint32 code_point, string16* output) {
-  if (CBU16_LENGTH(code_point) == 1) {
-    // Thie code point is in the Basic Multilingual Plane (BMP).
-    output->push_back(static_cast<char16>(code_point));
-    return 1;
-  }
-  // Non-BMP characters use a double-character encoding.
-  size_t char_offset = output->length();
-  output->resize(char_offset + CBU16_MAX_LENGTH);
-  CBU16_APPEND_UNSAFE(&(*output)[0], char_offset, code_point);
-  return CBU16_MAX_LENGTH;
-}
-
-// Generalized Unicode converter -----------------------------------------------
-
-template<typename CHAR>
-void PrepareForUTF8Output(const CHAR* src,
-                          size_t src_len,
-                          std::string* output) {
-  output->clear();
-  if (src_len == 0)
-    return;
-  if (src[0] < 0x80) {
-    // Assume that the entire input will be ASCII.
-    output->reserve(src_len);
-  } else {
-    // Assume that the entire input is non-ASCII and will have 3 bytes per char.
-    output->reserve(src_len * 3);
-  }
-}
-
-// Instantiate versions we know callers will need.
-template void PrepareForUTF8Output(const wchar_t*, size_t, std::string*);
-template void PrepareForUTF8Output(const char16*, size_t, std::string*);
-
-template<typename STRING>
-void PrepareForUTF16Or32Output(const char* src,
-                               size_t src_len,
-                               STRING* output) {
-  output->clear();
-  if (src_len == 0)
-    return;
-  if (static_cast<unsigned char>(src[0]) < 0x80) {
-    // Assume the input is all ASCII, which means 1:1 correspondence.
-    output->reserve(src_len);
-  } else {
-    // Otherwise assume that the UTF-8 sequences will have 2 bytes for each
-    // character.
-    output->reserve(src_len / 2);
-  }
-}
-
-// Instantiate versions we know callers will need.
-template void PrepareForUTF16Or32Output(const char*, size_t, std::wstring*);
-template void PrepareForUTF16Or32Output(const char*, size_t, string16*);
-
-}  // namespace base