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This commit is contained in:
QuFY
2025-09-20 17:13:38 +08:00
parent 7787b3ee30
commit 28ff2b0264
5251 changed files with 345029 additions and 285168 deletions
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117
Pods/abseil/absl/strings/escaping.cc generated
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@@ -21,10 +21,12 @@
#include <cstring>
#include <limits>
#include <string>
#include <utility>
#include "absl/base/config.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/base/internal/unaligned_access.h"
#include "absl/base/nullability.h"
#include "absl/strings/ascii.h"
#include "absl/strings/charset.h"
#include "absl/strings/internal/escaping.h"
@@ -54,7 +56,8 @@ inline unsigned int hex_digit_to_int(char c) {
return x & 0xf;
}
inline bool IsSurrogate(char32_t c, absl::string_view src, std::string* error) {
inline bool IsSurrogate(char32_t c, absl::string_view src,
absl::Nullable<std::string*> error) {
if (c >= 0xD800 && c <= 0xDFFF) {
if (error) {
*error = absl::StrCat("invalid surrogate character (0xD800-DFFF): \\",
@@ -83,7 +86,9 @@ inline bool IsSurrogate(char32_t c, absl::string_view src, std::string* error) {
// UnescapeCEscapeSequences().
// ----------------------------------------------------------------------
bool CUnescapeInternal(absl::string_view source, bool leave_nulls_escaped,
char* dest, ptrdiff_t* dest_len, std::string* error) {
absl::Nonnull<char*> dest,
absl::Nonnull<ptrdiff_t*> dest_len,
absl::Nullable<std::string*> error) {
char* d = dest;
const char* p = source.data();
const char* end = p + source.size();
@@ -290,7 +295,8 @@ bool CUnescapeInternal(absl::string_view source, bool leave_nulls_escaped,
// may be the same.
// ----------------------------------------------------------------------
bool CUnescapeInternal(absl::string_view source, bool leave_nulls_escaped,
std::string* dest, std::string* error) {
absl::Nonnull<std::string*> dest,
absl::Nullable<std::string*> error) {
strings_internal::STLStringResizeUninitialized(dest, source.size());
ptrdiff_t dest_size;
@@ -362,7 +368,7 @@ std::string CEscapeInternal(absl::string_view src, bool use_hex,
}
/* clang-format off */
constexpr unsigned char c_escaped_len[256] = {
constexpr unsigned char kCEscapedLen[256] = {
4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 4, 4, 2, 4, 4, // \t, \n, \r
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, // ", '
@@ -387,12 +393,28 @@ constexpr unsigned char c_escaped_len[256] = {
// that UTF-8 bytes are not handled specially.
inline size_t CEscapedLength(absl::string_view src) {
size_t escaped_len = 0;
for (char c : src)
escaped_len += c_escaped_len[static_cast<unsigned char>(c)];
// The maximum value of kCEscapedLen[x] is 4, so we can escape any string of
// length size_t_max/4 without checking for overflow.
size_t unchecked_limit =
std::min<size_t>(src.size(), std::numeric_limits<size_t>::max() / 4);
size_t i = 0;
while (i < unchecked_limit) {
// Common case: No need to check for overflow.
escaped_len += kCEscapedLen[static_cast<unsigned char>(src[i++])];
}
while (i < src.size()) {
// Beyond unchecked_limit we need to check for overflow before adding.
size_t char_len = kCEscapedLen[static_cast<unsigned char>(src[i++])];
ABSL_INTERNAL_CHECK(
escaped_len <= std::numeric_limits<size_t>::max() - char_len,
"escaped_len overflow");
escaped_len += char_len;
}
return escaped_len;
}
void CEscapeAndAppendInternal(absl::string_view src, std::string* dest) {
void CEscapeAndAppendInternal(absl::string_view src,
absl::Nonnull<std::string*> dest) {
size_t escaped_len = CEscapedLength(src);
if (escaped_len == src.size()) {
dest->append(src.data(), src.size());
@@ -400,12 +422,15 @@ void CEscapeAndAppendInternal(absl::string_view src, std::string* dest) {
}
size_t cur_dest_len = dest->size();
ABSL_INTERNAL_CHECK(
cur_dest_len <= std::numeric_limits<size_t>::max() - escaped_len,
"std::string size overflow");
strings_internal::STLStringResizeUninitialized(dest,
cur_dest_len + escaped_len);
char* append_ptr = &(*dest)[cur_dest_len];
for (char c : src) {
size_t char_len = c_escaped_len[static_cast<unsigned char>(c)];
size_t char_len = kCEscapedLen[static_cast<unsigned char>(c)];
if (char_len == 1) {
*append_ptr++ = c;
} else if (char_len == 2) {
@@ -446,9 +471,10 @@ void CEscapeAndAppendInternal(absl::string_view src, std::string* dest) {
// Reverses the mapping in Base64EscapeInternal; see that method's
// documentation for details of the mapping.
bool Base64UnescapeInternal(const char* src_param, size_t szsrc, char* dest,
size_t szdest, const signed char* unbase64,
size_t* len) {
bool Base64UnescapeInternal(absl::Nullable<const char*> src_param, size_t szsrc,
absl::Nullable<char*> dest, size_t szdest,
absl::Nonnull<const signed char*> unbase64,
absl::Nonnull<size_t*> len) {
static const char kPad64Equals = '=';
static const char kPad64Dot = '.';
@@ -784,8 +810,9 @@ constexpr signed char kUnWebSafeBase64[] = {
/* clang-format on */
template <typename String>
bool Base64UnescapeInternal(const char* src, size_t slen, String* dest,
const signed char* unbase64) {
bool Base64UnescapeInternal(absl::Nullable<const char*> src, size_t slen,
absl::Nonnull<String*> dest,
absl::Nonnull<const signed char*> unbase64) {
// Determine the size of the output string. Base64 encodes every 3 bytes into
// 4 characters. Any leftover chars are added directly for good measure.
const size_t dest_len = 3 * (slen / 4) + (slen % 4);
@@ -829,13 +856,32 @@ constexpr char kHexValueLenient[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
constexpr signed char kHexValueStrict[256] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, // '0'..'9'
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 'A'..'F'
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 'a'..'f'
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
};
/* clang-format on */
// This is a templated function so that T can be either a char*
// or a string. This works because we use the [] operator to access
// individual characters at a time.
template <typename T>
void HexStringToBytesInternal(const char* from, T to, size_t num) {
void HexStringToBytesInternal(absl::Nullable<const char*> from, T to,
size_t num) {
for (size_t i = 0; i < num; i++) {
to[i] = static_cast<char>(kHexValueLenient[from[i * 2] & 0xFF] << 4) +
(kHexValueLenient[from[i * 2 + 1] & 0xFF]);
@@ -845,7 +891,8 @@ void HexStringToBytesInternal(const char* from, T to, size_t num) {
// 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, size_t num) {
void BytesToHexStringInternal(absl::Nullable<const unsigned char*> src, T dest,
size_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 = &numbers_internal::kHexTable[*src_ptr * 2];
@@ -860,8 +907,8 @@ void BytesToHexStringInternal(const unsigned char* src, T dest, size_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, absl::Nonnull<std::string*> dest,
absl::Nullable<std::string*> error) {
return CUnescapeInternal(source, kUnescapeNulls, dest, error);
}
@@ -883,21 +930,23 @@ std::string Utf8SafeCHexEscape(absl::string_view src) {
return CEscapeInternal(src, true, true);
}
bool Base64Unescape(absl::string_view src, std::string* dest) {
bool Base64Unescape(absl::string_view src, absl::Nonnull<std::string*> dest) {
return Base64UnescapeInternal(src.data(), src.size(), dest, kUnBase64);
}
bool WebSafeBase64Unescape(absl::string_view src, std::string* dest) {
bool WebSafeBase64Unescape(absl::string_view src,
absl::Nonnull<std::string*> dest) {
return Base64UnescapeInternal(src.data(), src.size(), dest, kUnWebSafeBase64);
}
void Base64Escape(absl::string_view src, std::string* dest) {
void Base64Escape(absl::string_view src, absl::Nonnull<std::string*> dest) {
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) {
void WebSafeBase64Escape(absl::string_view src,
absl::Nonnull<std::string*> dest) {
strings_internal::Base64EscapeInternal(
reinterpret_cast<const unsigned char*>(src.data()), src.size(), dest,
false, strings_internal::kWebSafeBase64Chars);
@@ -919,6 +968,32 @@ std::string WebSafeBase64Escape(absl::string_view src) {
return dest;
}
bool HexStringToBytes(absl::string_view hex,
absl::Nonnull<std::string*> bytes) {
std::string output;
size_t num_bytes = hex.size() / 2;
if (hex.size() != num_bytes * 2) {
return false;
}
absl::strings_internal::STLStringResizeUninitialized(&output, num_bytes);
auto hex_p = hex.cbegin();
for (std::string::iterator bin_p = output.begin(); bin_p != output.end();
++bin_p) {
int h1 = absl::kHexValueStrict[static_cast<size_t>(*hex_p++)];
int h2 = absl::kHexValueStrict[static_cast<size_t>(*hex_p++)];
if (h1 == -1 || h2 == -1) {
output.resize(static_cast<size_t>(bin_p - output.begin()));
return false;
}
*bin_p = static_cast<char>((h1 << 4) + h2);
}
*bytes = std::move(output);
return true;
}
std::string HexStringToBytes(absl::string_view from) {
std::string result;
const auto num = from.size() / 2;