Add the StringPiece class.
Change-Id: I4e8c303261f79553cfe4853d5c7e1adf851496fc
diff --git a/Android.common.mk b/Android.common.mk
index e21ba10..3dce0b5 100644
--- a/Android.common.mk
+++ b/Android.common.mk
@@ -46,7 +46,8 @@
src/memory_region.cc \
src/object.cc \
src/raw_dex_file.cc \
- src/runtime.cc
+ src/runtime.cc \
+ src/stringpiece.cc
ifeq ($(LIBART_TARGET_ARCH),arm)
LIBART_LOCAL_SRC_FILES += \
diff --git a/src/stringpiece.cc b/src/stringpiece.cc
new file mode 100644
index 0000000..098c6ef
--- /dev/null
+++ b/src/stringpiece.cc
@@ -0,0 +1,112 @@
+// Copyright 2010 Google
+// Licensed under the Apache License, Version 2.0 (the "License");
+// 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
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <iostream>
+#include <utility>
+#include "src/stringpiece.h"
+
+using art::StringPiece;
+
+std::ostream& operator<<(std::ostream& o, const StringPiece& piece) {
+ o.write(piece.data(), piece.size());
+ return o;
+}
+
+bool operator==(const StringPiece& x, const StringPiece& y) {
+ int len = x.size();
+ if (len != y.size()) {
+ return false;
+ }
+ const char* p = x.data();
+ const char* p2 = y.data();
+ // Test last byte in case strings share large common prefix
+ if ((len > 0) && (p[len-1] != p2[len-1])) return false;
+ const char* p_limit = p + len;
+ for (; p < p_limit; p++, p2++) {
+ if (*p != *p2)
+ return false;
+ }
+ return true;
+}
+
+bool operator<(const art::StringPiece& x, const art::StringPiece& y) {
+ const int r = memcmp(x.data(), y.data(),
+ std::min(x.size(), y.size()));
+ return ((r < 0) || ((r == 0) && (x.size() < y.size())));
+}
+
+void StringPiece::CopyToString(std::string* target) const {
+ target->assign(ptr_, length_);
+}
+
+int StringPiece::copy(char* buf, size_type n, size_type pos) const {
+ int ret = std::min(length_ - pos, n);
+ memcpy(buf, ptr_ + pos, ret);
+ return ret;
+}
+
+int StringPiece::find(const StringPiece& s, size_type pos) const {
+ if (length_ < 0 || pos > static_cast<size_type>(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_ <= static_cast<size_type>(length_) ? xpos : npos;
+}
+
+int StringPiece::compare(const StringPiece& x) const {
+ int r = memcmp(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;
+}
+
+int StringPiece::find(char c, size_type pos) const {
+ if (length_ <= 0 || pos >= static_cast<size_type>(length_)) {
+ return npos;
+ }
+ const char* result = std::find(ptr_ + pos, ptr_ + length_, c);
+ return result != ptr_ + length_ ? result - ptr_ : npos;
+}
+
+int StringPiece::rfind(const StringPiece& s, size_type pos) const {
+ if (length_ < s.length_) return npos;
+ const size_t ulen = length_;
+ if (s.length_ == 0) return std::min(ulen, pos);
+
+ const char* last = ptr_ + std::min(ulen - 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;
+}
+
+int StringPiece::rfind(char c, size_type pos) const {
+ if (length_ <= 0) return npos;
+ for (int i = std::min(pos, static_cast<size_type>(length_ - 1));
+ i >= 0; --i) {
+ if (ptr_[i] == c) {
+ return i;
+ }
+ }
+ return npos;
+}
+
+StringPiece StringPiece::substr(size_type pos, size_type n) const {
+ if (pos > static_cast<size_type>(length_)) pos = length_;
+ if (n > length_ - pos) n = length_ - pos;
+ return StringPiece(ptr_ + pos, n);
+}
+
+const StringPiece::size_type StringPiece::npos = size_type(-1);
diff --git a/src/stringpiece.h b/src/stringpiece.h
new file mode 100644
index 0000000..ca12212
--- /dev/null
+++ b/src/stringpiece.h
@@ -0,0 +1,179 @@
+// Copyright 2010 Google
+// Licensed under the Apache License, Version 2.0 (the "License");
+// 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
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// 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 ART_SRC_STRINGPIECE_H_
+#define ART_SRC_STRINGPIECE_H_
+
+#include <string.h>
+#include <algorithm>
+#include <iosfwd>
+#include <string>
+
+namespace art {
+
+class StringPiece {
+ private:
+ const char* ptr_;
+ int 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) { }
+ StringPiece(const char* str) // NOLINT
+ : ptr_(str), length_((str == NULL) ? 0 : static_cast<int>(strlen(str))) { }
+ StringPiece(const std::string& str) // NOLINT
+ : ptr_(str.data()), length_(static_cast<int>(str.size())) { }
+ StringPiece(const char* offset, int 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_; }
+ int size() const { return length_; }
+ int length() const { return length_; }
+ bool empty() const { return length_ == 0; }
+
+ void clear() {
+ ptr_ = NULL;
+ length_ = 0;
+ }
+ void set(const char* data, int len) {
+ ptr_ = data;
+ length_ = len;
+ }
+ void set(const char* str) {
+ ptr_ = str;
+ if (str != NULL)
+ length_ = static_cast<int>(strlen(str));
+ else
+ length_ = 0;
+ }
+ void set(const void* data, int len) {
+ ptr_ = reinterpret_cast<const char*>(data);
+ length_ = len;
+ }
+
+ char operator[](int i) const { return ptr_[i]; }
+
+ void remove_prefix(int n) {
+ ptr_ += n;
+ length_ -= n;
+ }
+
+ void remove_suffix(int n) {
+ length_ -= n;
+ }
+
+ int compare(const StringPiece& x) const;
+
+ std::string as_string() const {
+ return std::string(data(), size());
+ }
+ // We also define ToString() here, since many other string-like
+ // interfaces name the routine that converts to a C++ string
+ // "ToString", and it's confusing to have the method that does that
+ // for a StringPiece be called "as_string()". We also leave the
+ // "as_string()" method defined here for existing code.
+ std::string ToString() const {
+ return std::string(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_) &&
+ (memcmp(ptr_, x.ptr_, x.length_) == 0));
+ }
+
+ // Does "this" end with "x"
+ bool ends_with(const StringPiece& x) const {
+ return ((length_ >= x.length_) &&
+ (memcmp(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 size_t size_type;
+ 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_);
+ }
+ // STLS says return size_type, but Google says return int
+ int max_size() const { return length_; }
+ int capacity() const { return length_; }
+
+ int copy(char* buf, size_type n, size_type pos = 0) const;
+
+ int find(const StringPiece& s, size_type pos = 0) const;
+ int find(char c, size_type pos = 0) const;
+ int rfind(const StringPiece& s, size_type pos = npos) const;
+ int rfind(char c, size_type pos = npos) const;
+
+ StringPiece substr(size_type pos, size_type n = npos) const;
+};
+
+} // namespace art
+
+bool operator==(const art::StringPiece& x, const art::StringPiece& y);
+
+inline bool operator!=(const art::StringPiece& x, const art::StringPiece& y) {
+ return !(x == y);
+}
+
+bool operator<(const art::StringPiece& x, const art::StringPiece& y);
+
+inline bool operator>(const art::StringPiece& x, const art::StringPiece& y) {
+ return y < x;
+}
+
+inline bool operator<=(const art::StringPiece& x, const art::StringPiece& y) {
+ return !(x > y);
+}
+
+inline bool operator>=(const art::StringPiece& x, const art::StringPiece& y) {
+ return !(x < y);
+}
+
+// allow StringPiece to be logged
+extern std::ostream& operator<<(std::ostream& o, const art::StringPiece& piece);
+
+#endif // ART_SRC_STRINGPIECE_H_
