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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /ipc/chromium/src/base/string_piece.cc | |
parent | Initial commit. (diff) | |
download | thunderbird-upstream.tar.xz thunderbird-upstream.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'ipc/chromium/src/base/string_piece.cc')
-rw-r--r-- | ipc/chromium/src/base/string_piece.cc | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/ipc/chromium/src/base/string_piece.cc b/ipc/chromium/src/base/string_piece.cc new file mode 100644 index 0000000000..7b83df0758 --- /dev/null +++ b/ipc/chromium/src/base/string_piece.cc @@ -0,0 +1,190 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +// Copyright (c) 2006-2008 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. +// Copied from strings/stringpiece.cc with modifications + +#include <algorithm> +#include <ostream> + +#include "base/string_piece.h" + +typedef StringPiece::size_type size_type; + +std::ostream& operator<<(std::ostream& o, const StringPiece& piece) { + o.write(piece.data(), static_cast<std::streamsize>(piece.size())); + return o; +} + +bool operator==(const StringPiece& x, const StringPiece& y) { + if (x.size() != y.size()) return false; + + return StringPiece::wordmemcmp(x.data(), y.data(), x.size()) == 0; +} + +void StringPiece::CopyToString(std::string* target) const { + target->assign(!empty() ? data() : "", size()); +} + +void StringPiece::AppendToString(std::string* target) const { + if (!empty()) target->append(data(), size()); +} + +size_type StringPiece::copy(char* buf, size_type n, size_type pos) const { + size_type ret = std::min(length_ - pos, n); + memcpy(buf, ptr_ + pos, ret); + return ret; +} + +size_type StringPiece::find(const StringPiece& s, size_type pos) const { + if (pos > length_) return npos; + + const char* result = + std::search(ptr_ + pos, ptr_ + length_, s.ptr_, s.ptr_ + s.length_); + const size_type xpos = result - ptr_; + return xpos + s.length_ <= length_ ? xpos : npos; +} + +size_type StringPiece::find(char c, size_type pos) const { + if (pos >= length_) return npos; + + const char* result = std::find(ptr_ + pos, ptr_ + length_, c); + return result != ptr_ + length_ ? result - ptr_ : npos; +} + +size_type StringPiece::rfind(const StringPiece& s, size_type pos) const { + if (length_ < s.length_) return npos; + + if (s.empty()) return std::min(length_, pos); + + const char* last = ptr_ + std::min(length_ - s.length_, pos) + s.length_; + const char* result = std::find_end(ptr_, last, s.ptr_, s.ptr_ + s.length_); + return result != last ? result - ptr_ : npos; +} + +size_type StringPiece::rfind(char c, size_type pos) const { + if (length_ == 0) return npos; + + for (size_type i = std::min(pos, length_ - 1);; --i) { + if (ptr_[i] == c) return i; + if (i == 0) break; + } + return npos; +} + +// For each character in characters_wanted, sets the index corresponding +// to the ASCII code of that character to 1 in table. This is used by +// the find_.*_of methods below to tell whether or not a character is in +// the lookup table in constant time. +// The argument `table' must be an array that is large enough to hold all +// the possible values of an unsigned char. Thus it should be be declared +// as follows: +// bool table[UCHAR_MAX + 1] +static inline void BuildLookupTable(const StringPiece& characters_wanted, + bool* table) { + const size_type length = characters_wanted.length(); + const char* const data = characters_wanted.data(); + for (size_type i = 0; i < length; ++i) { + table[static_cast<unsigned char>(data[i])] = true; + } +} + +size_type StringPiece::find_first_of(const StringPiece& s, + size_type pos) const { + if (length_ == 0 || s.length_ == 0) return npos; + + // Avoid the cost of BuildLookupTable() for a single-character search. + if (s.length_ == 1) return find_first_of(s.ptr_[0], pos); + + bool lookup[UCHAR_MAX + 1] = {false}; + BuildLookupTable(s, lookup); + for (size_type i = pos; i < length_; ++i) { + if (lookup[static_cast<unsigned char>(ptr_[i])]) { + return i; + } + } + return npos; +} + +size_type StringPiece::find_first_not_of(const StringPiece& s, + size_type pos) const { + if (length_ == 0) return npos; + + if (s.length_ == 0) return 0; + + // Avoid the cost of BuildLookupTable() for a single-character search. + if (s.length_ == 1) return find_first_not_of(s.ptr_[0], pos); + + bool lookup[UCHAR_MAX + 1] = {false}; + BuildLookupTable(s, lookup); + for (size_type i = pos; i < length_; ++i) { + if (!lookup[static_cast<unsigned char>(ptr_[i])]) { + return i; + } + } + return npos; +} + +size_type StringPiece::find_first_not_of(char c, size_type pos) const { + if (length_ == 0) return npos; + + for (; pos < length_; ++pos) { + if (ptr_[pos] != c) { + return pos; + } + } + return npos; +} + +size_type StringPiece::find_last_of(const StringPiece& s, size_type pos) const { + if (length_ == 0 || s.length_ == 0) return npos; + + // Avoid the cost of BuildLookupTable() for a single-character search. + if (s.length_ == 1) return find_last_of(s.ptr_[0], pos); + + bool lookup[UCHAR_MAX + 1] = {false}; + BuildLookupTable(s, lookup); + for (size_type i = std::min(pos, length_ - 1);; --i) { + if (lookup[static_cast<unsigned char>(ptr_[i])]) return i; + if (i == 0) break; + } + return npos; +} + +size_type StringPiece::find_last_not_of(const StringPiece& s, + size_type pos) const { + if (length_ == 0) return npos; + + size_type i = std::min(pos, length_ - 1); + if (s.length_ == 0) return i; + + // Avoid the cost of BuildLookupTable() for a single-character search. + if (s.length_ == 1) return find_last_not_of(s.ptr_[0], pos); + + bool lookup[UCHAR_MAX + 1] = {false}; + BuildLookupTable(s, lookup); + for (;; --i) { + if (!lookup[static_cast<unsigned char>(ptr_[i])]) return i; + if (i == 0) break; + } + return npos; +} + +size_type StringPiece::find_last_not_of(char c, size_type pos) const { + if (length_ == 0) return npos; + + for (size_type i = std::min(pos, length_ - 1);; --i) { + if (ptr_[i] != c) return i; + if (i == 0) break; + } + return npos; +} + +StringPiece StringPiece::substr(size_type pos, size_type n) const { + if (pos > length_) pos = length_; + if (n > length_ - pos) n = length_ - pos; + return StringPiece(ptr_ + pos, n); +} + +const StringPiece::size_type StringPiece::npos = size_type(-1); |