diff options
Diffstat (limited to 'absl/strings/escaping.cc')
| -rw-r--r-- | absl/strings/escaping.cc | 54 |
1 files changed, 36 insertions, 18 deletions
diff --git a/absl/strings/escaping.cc b/absl/strings/escaping.cc index 69053c19..eb0974dc 100644 --- a/absl/strings/escaping.cc +++ b/absl/strings/escaping.cc @@ -4,7 +4,7 @@ // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // -// http://www.apache.org/licenses/LICENSE-2.0 +// https://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, @@ -33,7 +33,7 @@ #include "absl/strings/string_view.h" namespace absl { -inline namespace lts_2018_12_18 { +inline namespace lts_2019_08_08 { namespace { // Digit conversion. @@ -180,7 +180,8 @@ bool CUnescapeInternal(absl::string_view source, bool leave_nulls_escaped, ch = (ch << 4) + hex_digit_to_int(*++p); if (ch > 0xFF) { if (error) { - *error = "Value of \\" + std::string(hex_start, p + 1 - hex_start) + + *error = "Value of \\" + + std::string(hex_start, p + 1 - hex_start) + " exceeds 0xff"; } return false; @@ -295,7 +296,7 @@ bool CUnescapeInternal(absl::string_view source, bool leave_nulls_escaped, // ---------------------------------------------------------------------- // CUnescapeInternal() // -// Same as above but uses a C++ string for output. 'source' and 'dest' +// Same as above but uses a std::string for output. 'source' and 'dest' // may be the same. // ---------------------------------------------------------------------- bool CUnescapeInternal(absl::string_view source, bool leave_nulls_escaped, @@ -325,7 +326,8 @@ bool CUnescapeInternal(absl::string_view source, bool leave_nulls_escaped, // // Escaped chars: \n, \r, \t, ", ', \, and !absl::ascii_isprint(). // ---------------------------------------------------------------------- -std::string CEscapeInternal(absl::string_view src, bool use_hex, bool utf8_safe) { +std::string CEscapeInternal(absl::string_view src, bool use_hex, + bool utf8_safe) { std::string dest; bool last_hex_escape = false; // true if last output char was \xNN. @@ -787,7 +789,7 @@ size_t CalculateBase64EscapedLenInternal(size_t input_len, bool do_padding) { // Base64 encodes three bytes of input at a time. If the input is not // divisible by three, we pad as appropriate. // - // (from http://tools.ietf.org/html/rfc3548) + // (from https://tools.ietf.org/html/rfc3548) // Special processing is performed if fewer than 24 bits are available // at the end of the data being encoded. A full encoding quantum is // always completed at the end of a quantity. When fewer than 24 input @@ -801,12 +803,12 @@ size_t CalculateBase64EscapedLenInternal(size_t input_len, bool do_padding) { size_t len = (input_len / 3) * 4; if (input_len % 3 == 0) { - // (from http://tools.ietf.org/html/rfc3548) + // (from https://tools.ietf.org/html/rfc3548) // (1) the final quantum of encoding input is an integral multiple of 24 // bits; here, the final unit of encoded output will be an integral // multiple of 4 characters with no "=" padding, } else if (input_len % 3 == 1) { - // (from http://tools.ietf.org/html/rfc3548) + // (from https://tools.ietf.org/html/rfc3548) // (2) the final quantum of encoding input is exactly 8 bits; here, the // final unit of encoded output will be two characters followed by two // "=" padding characters, or @@ -815,7 +817,7 @@ size_t CalculateBase64EscapedLenInternal(size_t input_len, bool do_padding) { len += 2; } } else { // (input_len % 3 == 2) - // (from http://tools.ietf.org/html/rfc3548) + // (from https://tools.ietf.org/html/rfc3548) // (3) the final quantum of encoding input is exactly 16 bits; here, the // final unit of encoded output will be three characters followed by one // "=" padding character. @@ -844,8 +846,8 @@ size_t Base64EscapeInternal(const unsigned char* src, size_t szsrc, char* dest, // Three bytes of data encodes to four characters of cyphertext. // So we can pump through three-byte chunks atomically. - if (szsrc >= 3) { // "limit_src - 3" is UB if szsrc < 3 - while (cur_src < limit_src - 3) { // as long as we have >= 32 bits + if (szsrc >= 3) { // "limit_src - 3" is UB if szsrc < 3. + while (cur_src < limit_src - 3) { // While we have >= 32 bits. uint32_t in = absl::big_endian::Load32(cur_src) >> 8; cur_dest[0] = base64[in >> 18]; @@ -1012,7 +1014,8 @@ void HexStringToBytesInternal(const char* from, T to, ptrdiff_t num) { } } -// This is a templated function so that T can be either a char* or a string. +// This is a templated function so that T can be either a char* or a +// std::string. template <typename T> void BytesToHexStringInternal(const unsigned char* src, T dest, ptrdiff_t num) { auto dest_ptr = &dest[0]; @@ -1029,7 +1032,8 @@ void BytesToHexStringInternal(const unsigned char* src, T dest, ptrdiff_t num) { // // See CUnescapeInternal() for implementation details. // ---------------------------------------------------------------------- -bool CUnescape(absl::string_view source, std::string* dest, std::string* error) { +bool CUnescape(absl::string_view source, std::string* dest, + std::string* error) { return CUnescapeInternal(source, kUnescapeNulls, dest, error); } @@ -1052,10 +1056,10 @@ std::string Utf8SafeCHexEscape(absl::string_view src) { } // ---------------------------------------------------------------------- -// ptrdiff_t Base64Unescape() - base64 decoder -// ptrdiff_t Base64Escape() - base64 encoder -// ptrdiff_t WebSafeBase64Unescape() - Google's variation of base64 decoder -// ptrdiff_t WebSafeBase64Escape() - Google's variation of base64 encoder +// Base64Unescape() - base64 decoder +// Base64Escape() - base64 encoder +// WebSafeBase64Unescape() - Google's variation of base64 decoder +// WebSafeBase64Escape() - Google's variation of base64 encoder // // Check out // http://tools.ietf.org/html/rfc2045 for formal description, but what we @@ -1093,6 +1097,20 @@ void WebSafeBase64Escape(absl::string_view src, std::string* dest) { src.size(), dest, false, kWebSafeBase64Chars); } +std::string Base64Escape(absl::string_view src) { + std::string dest; + Base64EscapeInternal(reinterpret_cast<const unsigned char*>(src.data()), + src.size(), &dest, true, kBase64Chars); + return dest; +} + +std::string WebSafeBase64Escape(absl::string_view src) { + std::string dest; + Base64EscapeInternal(reinterpret_cast<const unsigned char*>(src.data()), + src.size(), &dest, false, kWebSafeBase64Chars); + return dest; +} + std::string HexStringToBytes(absl::string_view from) { std::string result; const auto num = from.size() / 2; @@ -1109,5 +1127,5 @@ std::string BytesToHexString(absl::string_view from) { return result; } -} // inline namespace lts_2018_12_18 +} // inline namespace lts_2019_08_08 } // namespace absl |