summaryrefslogtreecommitdiffstats
path: root/ipc/chromium/src/base/string_piece.h
diff options
context:
space:
mode:
Diffstat (limited to 'ipc/chromium/src/base/string_piece.h')
-rw-r--r--ipc/chromium/src/base/string_piece.h186
1 files changed, 186 insertions, 0 deletions
diff --git a/ipc/chromium/src/base/string_piece.h b/ipc/chromium/src/base/string_piece.h
new file mode 100644
index 000000000..36c39009c
--- /dev/null
+++ b/ipc/chromium/src/base/string_piece.h
@@ -0,0 +1,186 @@
+/* -*- 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.h with modifications
+//
+// A string-like object that points to a sized piece of memory.
+//
+// Functions or methods may use const StringPiece& parameters to accept either
+// a "const char*" or a "string" value that will be implicitly converted to
+// a StringPiece. The implicit conversion means that it is often appropriate
+// to include this .h file in other files rather than forward-declaring
+// StringPiece as would be appropriate for most other Google classes.
+//
+// Systematic usage of StringPiece is encouraged as it will reduce unnecessary
+// conversions from "const char*" to "string" and back again.
+//
+
+#ifndef BASE_STRING_PIECE_H_
+#define BASE_STRING_PIECE_H_
+
+#include <algorithm>
+#include <iosfwd>
+#include <string>
+
+#include "base/basictypes.h"
+
+class StringPiece {
+ public:
+ typedef size_t size_type;
+
+ private:
+ const char* ptr_;
+ size_type length_;
+
+ public:
+ // We provide non-explicit singleton constructors so users can pass
+ // in a "const char*" or a "string" wherever a "StringPiece" is
+ // expected.
+ StringPiece() : ptr_(NULL), length_(0) { }
+ MOZ_IMPLICIT StringPiece(const char* str)
+ : ptr_(str), length_((str == NULL) ? 0 : strlen(str)) { }
+ MOZ_IMPLICIT StringPiece(const std::string& str)
+ : ptr_(str.data()), length_(str.size()) { }
+ StringPiece(const char* offset, size_type len)
+ : ptr_(offset), length_(len) { }
+
+ // data() may return a pointer to a buffer with embedded NULs, and the
+ // returned buffer may or may not be null terminated. Therefore it is
+ // typically a mistake to pass data() to a routine that expects a NUL
+ // terminated string.
+ const char* data() const { return ptr_; }
+ size_type size() const { return length_; }
+ size_type length() const { return length_; }
+ bool empty() const { return length_ == 0; }
+
+ void clear() { ptr_ = NULL; length_ = 0; }
+ void set(const char* aData, size_type aLen) { ptr_ = aData; length_ = aLen; }
+ void set(const char* str) {
+ ptr_ = str;
+ length_ = str ? strlen(str) : 0;
+ }
+ void set(const void* aData, size_type aLen) {
+ ptr_ = reinterpret_cast<const char*>(aData);
+ length_ = aLen;
+ }
+
+ char operator[](size_type i) const { return ptr_[i]; }
+
+ void remove_prefix(size_type n) {
+ ptr_ += n;
+ length_ -= n;
+ }
+
+ void remove_suffix(size_type n) {
+ length_ -= n;
+ }
+
+ int compare(const StringPiece& x) const {
+ int r = wordmemcmp(ptr_, x.ptr_, std::min(length_, x.length_));
+ if (r == 0) {
+ if (length_ < x.length_) r = -1;
+ else if (length_ > x.length_) r = +1;
+ }
+ return r;
+ }
+
+ std::string as_string() const {
+ // std::string doesn't like to take a NULL pointer even with a 0 size.
+ return std::string(!empty() ? data() : "", size());
+ }
+
+ void CopyToString(std::string* target) const;
+ void AppendToString(std::string* target) const;
+
+ // Does "this" start with "x"
+ bool starts_with(const StringPiece& x) const {
+ return ((length_ >= x.length_) &&
+ (wordmemcmp(ptr_, x.ptr_, x.length_) == 0));
+ }
+
+ // Does "this" end with "x"
+ bool ends_with(const StringPiece& x) const {
+ return ((length_ >= x.length_) &&
+ (wordmemcmp(ptr_ + (length_-x.length_), x.ptr_, x.length_) == 0));
+ }
+
+ // standard STL container boilerplate
+ typedef char value_type;
+ typedef const char* pointer;
+ typedef const char& reference;
+ typedef const char& const_reference;
+ typedef ptrdiff_t difference_type;
+ static const size_type npos;
+ typedef const char* const_iterator;
+ typedef const char* iterator;
+ typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
+ typedef std::reverse_iterator<iterator> reverse_iterator;
+ iterator begin() const { return ptr_; }
+ iterator end() const { return ptr_ + length_; }
+ const_reverse_iterator rbegin() const {
+ return const_reverse_iterator(ptr_ + length_);
+ }
+ const_reverse_iterator rend() const {
+ return const_reverse_iterator(ptr_);
+ }
+
+ size_type max_size() const { return length_; }
+ size_type capacity() const { return length_; }
+
+ size_type copy(char* buf, size_type n, size_type pos = 0) const;
+
+ size_type find(const StringPiece& s, size_type pos = 0) const;
+ size_type find(char c, size_type pos = 0) const;
+ size_type rfind(const StringPiece& s, size_type pos = npos) const;
+ size_type rfind(char c, size_type pos = npos) const;
+
+ size_type find_first_of(const StringPiece& s, size_type pos = 0) const;
+ size_type find_first_of(char c, size_type pos = 0) const {
+ return find(c, pos);
+ }
+ size_type find_first_not_of(const StringPiece& s, size_type pos = 0) const;
+ size_type find_first_not_of(char c, size_type pos = 0) const;
+ size_type find_last_of(const StringPiece& s, size_type pos = npos) const;
+ size_type find_last_of(char c, size_type pos = npos) const {
+ return rfind(c, pos);
+ }
+ size_type find_last_not_of(const StringPiece& s, size_type pos = npos) const;
+ size_type find_last_not_of(char c, size_type pos = npos) const;
+
+ StringPiece substr(size_type pos, size_type n = npos) const;
+
+ static int wordmemcmp(const char* p, const char* p2, size_type N) {
+ return memcmp(p, p2, N);
+ }
+};
+
+bool operator==(const ::StringPiece& x, const ::StringPiece& y);
+
+inline bool operator!=(const ::StringPiece& x, const ::StringPiece& y) {
+ return !(x == y);
+}
+
+inline bool operator<(const ::StringPiece& x, const ::StringPiece& y) {
+ const int r = ::StringPiece::wordmemcmp(x.data(), y.data(),
+ std::min(x.size(), y.size()));
+ return ((r < 0) || ((r == 0) && (x.size() < y.size())));
+}
+
+inline bool operator>(const ::StringPiece& x, const ::StringPiece& y) {
+ return y < x;
+}
+
+inline bool operator<=(const ::StringPiece& x, const ::StringPiece& y) {
+ return !(x > y);
+}
+
+inline bool operator>=(const ::StringPiece& x, const ::StringPiece& y) {
+ return !(x < y);
+}
+
+// allow StringPiece to be logged (needed for unit testing).
+extern std::ostream& operator<<(std::ostream& o, const ::StringPiece& piece);
+
+#endif // BASE_STRING_PIECE_H_