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authorGravatar Abseil Team <absl-team@google.com>2020-02-25 22:27:31 +0100
committerGravatar CJ Johnson <johnsoncj@google.com>2020-02-25 17:56:58 -0500
commitb832dce8489ef7b6231384909fd9b68d5a5ff2b7 (patch)
tree3ad4be9a9a4105366be714da9458e076a77be18f /absl/strings/escaping.cc
parentaa844899c937bde5d2b24f276b59997e5b668bde (diff)
Creation of LTS branch "lts_2020_02_25"20200225
- 0033c9ea91a52ade7c6b725aa2ef3cbe15463421 Fix build on FreeBSD/powerpc (#616) by kgotlinux <60880393+kgotlinux@users.noreply.github.com> - 0d5ce2797eb695aee7e019e25323251ef6ffc277 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - b69c7d880caddfc25bf348dbcfe9d45fdd8bc6e6 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 2a5633fc077a58528cdbfe78720f3f6bfdc6044d Merge "Export of internal Abseil changes" by Xiaoyi Zhang <zhangxy@google.com> - f9b3d6e493c1b6ab3dbdab71c5f8fa849db4abaf Add RISCV support to GetProgramCounter() (#621) by Khem Raj <raj.khem@gmail.com> - 0232c87f21c26718aa3eb2d86678070f3b498a4e Add missing ABSL_HAVE_VDSO_SUPPORT conditional (#622) by Sinan Kaya <41809318+franksinankaya@users.noreply.github.com> - 3c814105108680997d0821077694f663693b5382 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - c44657f55692eddf5504156645d1f4ec7b3acabd Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 98eb410c93ad059f9bba1bf43f5bb916fc92a5ea Export of internal Abseil changes by Abseil Team <absl-team@google.com> - bf78e977309c4cb946914b456404141ddac1c302 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - d95d1567165d449e4c213ea31a15cbb112a9865f Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 24713a7036a81498334807fa5c7ad3cb7c643711 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 72382c21fefed981b4b8a2a1b82e2d231c2c2e39 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 08a7e7bf972c8451855a5022f2faf3d3655db015 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 36bcd9599b3f48c99357ba61cf33584889306d6a Fix pointer format specifier in documentation (#614) by Andre Nguyen <andre-nguyen@users.noreply.github.com> - 0f86336b6939ea673cc1cbe29189286cae67d63a Export of internal Abseil changes by Abseil Team <absl-team@google.com> - c512f118dde6ffd51cb7d8ac8804bbaf4d266c3a Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 37dd2562ec830d547a1524bb306be313ac3f2556 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 44427702614d7b86b064ba06a390f5eb2f85dbf6 fix: Add support for more ARM processors detection (#608) by Andre Nguyen <andre-nguyen@users.noreply.github.com> - 159bf2bf6d1cc8087e02468d071e94d1177d1bae Export of internal Abseil changes by Abseil Team <absl-team@google.com> - a2e6adecc294dc4cd98cc285a9134ce58e0f2ad0 Use https links. 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19b021cb3ff23048dfbe236a4e611925d8930831 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - ecc0033b54847f6c9ee37dbb0be8aa17e5b6d37b Always enable proper symbolize implementation on Windows ... by Loo Rong Jie <loorongjie@gmail.com> - 2796d500aea5a31d26b8b24a33fab7a1c8fa2f32 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - e4c8d0eb8ef4acb5d7a4252b3b87feb391ef7e41 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - a15364ce4d88534ae2295127e5d8e32aefb6b446 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - ab3552a18964e7063c8324f45b3896a6a20b08a8 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - e9f9000c7c80993cb589d011616b7a8016e42f4a Fix ABSL_WAITER_MODE detection for mingw (#342) by Joe Sylve <Joe.Sylve@gmail.com> - abea769b551f7a100f540967cb95debdb0080df8 Fix ABSL_HAVE_ALARM check on mingw (#341) by Joe Sylve <Joe.Sylve@gmail.com> - 25597bdfc148e91e27678ec30efa52f4fc8c164f Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 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0302d1e5fa4fcdd1763b7d1bb3212943b1ae911d supppress unused variable warning for gcc (#372) by Martin <pizzard@users.noreply.github.com> - 262d74ba81b1fc4d71f459555cde8ecb39786d68 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - f0afae0d49af3e15a7169e019634d7719143d94d Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 0e7afdcbd24c7e5b7cab4e0217d8886f1525b520 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 9a41ffdd3a0ccbcdd29c4e3886b28e06f2cd9c66 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 36910d3d7e9fccadd6603f232d0c4f54dcd47c7e [bazel] Add fixes for --incompatible_load_cc_rules_from_b... by Yannic <contact@yannic-bonenberger.com> - aae8143cf9aa611f70d7ea9b95b8b8b383b2271a Export of internal Abseil changes by Abseil Team <absl-team@google.com> - d9aa92d7fb324314f9df487ac23d32a25650b742 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 321ab5303023c86cd15d9ddc5740fb4b4fde32e1 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 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Diffstat (limited to 'absl/strings/escaping.cc')
-rw-r--r--absl/strings/escaping.cc234
1 files changed, 26 insertions, 208 deletions
diff --git a/absl/strings/escaping.cc b/absl/strings/escaping.cc
index eb0974dc..7adc1b65 100644
--- a/absl/strings/escaping.cc
+++ b/absl/strings/escaping.cc
@@ -26,6 +26,7 @@
#include "absl/base/internal/raw_logging.h"
#include "absl/base/internal/unaligned_access.h"
#include "absl/strings/internal/char_map.h"
+#include "absl/strings/internal/escaping.h"
#include "absl/strings/internal/resize_uninitialized.h"
#include "absl/strings/internal/utf8.h"
#include "absl/strings/str_cat.h"
@@ -33,30 +34,9 @@
#include "absl/strings/string_view.h"
namespace absl {
-inline namespace lts_2019_08_08 {
+ABSL_NAMESPACE_BEGIN
namespace {
-// Digit conversion.
-constexpr char kHexChar[] = "0123456789abcdef";
-
-constexpr char kHexTable[513] =
- "000102030405060708090a0b0c0d0e0f"
- "101112131415161718191a1b1c1d1e1f"
- "202122232425262728292a2b2c2d2e2f"
- "303132333435363738393a3b3c3d3e3f"
- "404142434445464748494a4b4c4d4e4f"
- "505152535455565758595a5b5c5d5e5f"
- "606162636465666768696a6b6c6d6e6f"
- "707172737475767778797a7b7c7d7e7f"
- "808182838485868788898a8b8c8d8e8f"
- "909192939495969798999a9b9c9d9e9f"
- "a0a1a2a3a4a5a6a7a8a9aaabacadaeaf"
- "b0b1b2b3b4b5b6b7b8b9babbbcbdbebf"
- "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf"
- "d0d1d2d3d4d5d6d7d8d9dadbdcdddedf"
- "e0e1e2e3e4e5e6e7e8e9eaebecedeeef"
- "f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff";
-
// These are used for the leave_nulls_escaped argument to CUnescapeInternal().
constexpr bool kUnescapeNulls = false;
@@ -349,14 +329,14 @@ std::string CEscapeInternal(absl::string_view src, bool use_hex,
(last_hex_escape && absl::ascii_isxdigit(c)))) {
if (use_hex) {
dest.append("\\" "x");
- dest.push_back(kHexChar[c / 16]);
- dest.push_back(kHexChar[c % 16]);
+ dest.push_back(numbers_internal::kHexChar[c / 16]);
+ dest.push_back(numbers_internal::kHexChar[c % 16]);
is_hex_escape = true;
} else {
dest.append("\\");
- dest.push_back(kHexChar[c / 64]);
- dest.push_back(kHexChar[(c % 64) / 8]);
- dest.push_back(kHexChar[c % 8]);
+ dest.push_back(numbers_internal::kHexChar[c / 64]);
+ dest.push_back(numbers_internal::kHexChar[(c % 64) / 8]);
+ dest.push_back(numbers_internal::kHexChar[c % 8]);
}
} else {
dest.push_back(c);
@@ -785,177 +765,10 @@ constexpr signed char kUnWebSafeBase64[] = {
};
/* clang-format on */
-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 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
- // bits are available in an input group, zero bits are added (on the
- // right) to form an integral number of 6-bit groups. Padding at the
- // end of the data is performed using the '=' character. Since all base
- // 64 input is an integral number of octets, only the following cases
- // can arise:
-
- // Base64 encodes each three bytes of input into four bytes of output.
- size_t len = (input_len / 3) * 4;
-
- if (input_len % 3 == 0) {
- // (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 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
- len += 2;
- if (do_padding) {
- len += 2;
- }
- } else { // (input_len % 3 == 2)
- // (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.
- len += 3;
- if (do_padding) {
- len += 1;
- }
- }
-
- assert(len >= input_len); // make sure we didn't overflow
- return len;
-}
-
-size_t Base64EscapeInternal(const unsigned char* src, size_t szsrc, char* dest,
- size_t szdest, const char* base64,
- bool do_padding) {
- static const char kPad64 = '=';
-
- if (szsrc * 4 > szdest * 3) return 0;
-
- char* cur_dest = dest;
- const unsigned char* cur_src = src;
-
- char* const limit_dest = dest + szdest;
- const unsigned char* const limit_src = src + szsrc;
-
- // 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) { // While we have >= 32 bits.
- uint32_t in = absl::big_endian::Load32(cur_src) >> 8;
-
- cur_dest[0] = base64[in >> 18];
- in &= 0x3FFFF;
- cur_dest[1] = base64[in >> 12];
- in &= 0xFFF;
- cur_dest[2] = base64[in >> 6];
- in &= 0x3F;
- cur_dest[3] = base64[in];
-
- cur_dest += 4;
- cur_src += 3;
- }
- }
- // To save time, we didn't update szdest or szsrc in the loop. So do it now.
- szdest = limit_dest - cur_dest;
- szsrc = limit_src - cur_src;
-
- /* now deal with the tail (<=3 bytes) */
- switch (szsrc) {
- case 0:
- // Nothing left; nothing more to do.
- break;
- case 1: {
- // One byte left: this encodes to two characters, and (optionally)
- // two pad characters to round out the four-character cypherblock.
- if (szdest < 2) return 0;
- uint32_t in = cur_src[0];
- cur_dest[0] = base64[in >> 2];
- in &= 0x3;
- cur_dest[1] = base64[in << 4];
- cur_dest += 2;
- szdest -= 2;
- if (do_padding) {
- if (szdest < 2) return 0;
- cur_dest[0] = kPad64;
- cur_dest[1] = kPad64;
- cur_dest += 2;
- szdest -= 2;
- }
- break;
- }
- case 2: {
- // Two bytes left: this encodes to three characters, and (optionally)
- // one pad character to round out the four-character cypherblock.
- if (szdest < 3) return 0;
- uint32_t in = absl::big_endian::Load16(cur_src);
- cur_dest[0] = base64[in >> 10];
- in &= 0x3FF;
- cur_dest[1] = base64[in >> 4];
- in &= 0x00F;
- cur_dest[2] = base64[in << 2];
- cur_dest += 3;
- szdest -= 3;
- if (do_padding) {
- if (szdest < 1) return 0;
- cur_dest[0] = kPad64;
- cur_dest += 1;
- szdest -= 1;
- }
- break;
- }
- case 3: {
- // Three bytes left: same as in the big loop above. We can't do this in
- // the loop because the loop above always reads 4 bytes, and the fourth
- // byte is past the end of the input.
- if (szdest < 4) return 0;
- uint32_t in = (cur_src[0] << 16) + absl::big_endian::Load16(cur_src + 1);
- cur_dest[0] = base64[in >> 18];
- in &= 0x3FFFF;
- cur_dest[1] = base64[in >> 12];
- in &= 0xFFF;
- cur_dest[2] = base64[in >> 6];
- in &= 0x3F;
- cur_dest[3] = base64[in];
- cur_dest += 4;
- szdest -= 4;
- break;
- }
- default:
- // Should not be reached: blocks of 4 bytes are handled
- // in the while loop before this switch statement.
- ABSL_RAW_LOG(FATAL, "Logic problem? szsrc = %zu", szsrc);
- break;
- }
- return (cur_dest - dest);
-}
-
-constexpr char kBase64Chars[] =
- "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-
constexpr char kWebSafeBase64Chars[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
template <typename String>
-void Base64EscapeInternal(const unsigned char* src, size_t szsrc, String* dest,
- bool do_padding, const char* base64_chars) {
- const size_t calc_escaped_size =
- CalculateBase64EscapedLenInternal(szsrc, do_padding);
- strings_internal::STLStringResizeUninitialized(dest, calc_escaped_size);
-
- const size_t escaped_len = Base64EscapeInternal(
- src, szsrc, &(*dest)[0], dest->size(), base64_chars, do_padding);
- assert(calc_escaped_size == escaped_len);
- dest->erase(escaped_len);
-}
-
-template <typename String>
bool Base64UnescapeInternal(const char* src, size_t slen, String* dest,
const signed char* unbase64) {
// Determine the size of the output std::string. Base64 encodes every 3 bytes into
@@ -983,7 +796,7 @@ bool Base64UnescapeInternal(const char* src, size_t slen, String* dest,
}
/* clang-format off */
-constexpr char kHexValue[256] = {
+constexpr char kHexValueLenient[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
@@ -999,8 +812,9 @@ constexpr char kHexValue[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
+
/* clang-format on */
// This is a templated function so that T can be either a char*
@@ -1009,8 +823,8 @@ constexpr char kHexValue[256] = {
template <typename T>
void HexStringToBytesInternal(const char* from, T to, ptrdiff_t num) {
for (int i = 0; i < num; i++) {
- to[i] = (kHexValue[from[i * 2] & 0xFF] << 4) +
- (kHexValue[from[i * 2 + 1] & 0xFF]);
+ to[i] = (kHexValueLenient[from[i * 2] & 0xFF] << 4) +
+ (kHexValueLenient[from[i * 2 + 1] & 0xFF]);
}
}
@@ -1020,7 +834,7 @@ template <typename T>
void BytesToHexStringInternal(const unsigned char* src, T dest, ptrdiff_t num) {
auto dest_ptr = &dest[0];
for (auto src_ptr = src; src_ptr != (src + num); ++src_ptr, dest_ptr += 2) {
- const char* hex_p = &kHexTable[*src_ptr * 2];
+ const char* hex_p = &numbers_internal::kHexTable[*src_ptr * 2];
std::copy(hex_p, hex_p + 2, dest_ptr);
}
}
@@ -1088,26 +902,30 @@ bool WebSafeBase64Unescape(absl::string_view src, std::string* dest) {
}
void Base64Escape(absl::string_view src, std::string* dest) {
- Base64EscapeInternal(reinterpret_cast<const unsigned char*>(src.data()),
- src.size(), dest, true, kBase64Chars);
+ strings_internal::Base64EscapeInternal(
+ reinterpret_cast<const unsigned char*>(src.data()), src.size(), dest,
+ true, strings_internal::kBase64Chars);
}
void WebSafeBase64Escape(absl::string_view src, std::string* dest) {
- Base64EscapeInternal(reinterpret_cast<const unsigned char*>(src.data()),
- src.size(), dest, false, kWebSafeBase64Chars);
+ strings_internal::Base64EscapeInternal(
+ reinterpret_cast<const unsigned char*>(src.data()), 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);
+ strings_internal::Base64EscapeInternal(
+ reinterpret_cast<const unsigned char*>(src.data()), src.size(), &dest,
+ true, strings_internal::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);
+ strings_internal::Base64EscapeInternal(
+ reinterpret_cast<const unsigned char*>(src.data()), src.size(), &dest,
+ false, kWebSafeBase64Chars);
return dest;
}
@@ -1127,5 +945,5 @@ std::string BytesToHexString(absl::string_view from) {
return result;
}
-} // inline namespace lts_2019_08_08
+ABSL_NAMESPACE_END
} // namespace absl
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-18 07:16:00 +0000