Reland "Move webrtc/{base => rtc_base}" (https://codereview.webrtc.org/2877023002)
Reland the base->rtc_base without adding stub headers (will be
done in follow-up CL). This preserves git blame history of all files.
BUG=webrtc:7634
NOTRY=True
TBR=kwiberg@webrtc.org
Change-Id: Iea3bb6f3f67b8374c96337b63e8f5aa3e6181012
Reviewed-on: https://chromium-review.googlesource.com/554611
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#18821}diff --git a/webrtc/rtc_base/cryptstring.h b/webrtc/rtc_base/cryptstring.h
new file mode 100644
index 0000000..b7b6694
--- /dev/null
+++ b/webrtc/rtc_base/cryptstring.h
@@ -0,0 +1,167 @@
+/*
+ * Copyright 2004 The WebRTC Project Authors. All rights reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_RTC_BASE_CRYPTSTRING_H_
+#define WEBRTC_RTC_BASE_CRYPTSTRING_H_
+
+#include <string.h>
+
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace rtc {
+
+class CryptStringImpl {
+public:
+ virtual ~CryptStringImpl() {}
+ virtual size_t GetLength() const = 0;
+ virtual void CopyTo(char * dest, bool nullterminate) const = 0;
+ virtual std::string UrlEncode() const = 0;
+ virtual CryptStringImpl * Copy() const = 0;
+ virtual void CopyRawTo(std::vector<unsigned char> * dest) const = 0;
+};
+
+class EmptyCryptStringImpl : public CryptStringImpl {
+public:
+ ~EmptyCryptStringImpl() override {}
+ size_t GetLength() const override;
+ void CopyTo(char* dest, bool nullterminate) const override;
+ std::string UrlEncode() const override;
+ CryptStringImpl* Copy() const override;
+ void CopyRawTo(std::vector<unsigned char>* dest) const override;
+};
+
+class CryptString {
+ public:
+ CryptString();
+ size_t GetLength() const { return impl_->GetLength(); }
+ void CopyTo(char * dest, bool nullterminate) const { impl_->CopyTo(dest, nullterminate); }
+ CryptString(const CryptString& other);
+ explicit CryptString(const CryptStringImpl& impl);
+ ~CryptString();
+ CryptString & operator=(const CryptString & other) {
+ if (this != &other) {
+ impl_.reset(other.impl_->Copy());
+ }
+ return *this;
+ }
+ void Clear() { impl_.reset(new EmptyCryptStringImpl()); }
+ std::string UrlEncode() const { return impl_->UrlEncode(); }
+ void CopyRawTo(std::vector<unsigned char> * dest) const {
+ return impl_->CopyRawTo(dest);
+ }
+
+ private:
+ std::unique_ptr<const CryptStringImpl> impl_;
+};
+
+
+// Used for constructing strings where a password is involved and we
+// need to ensure that we zero memory afterwards
+class FormatCryptString {
+public:
+ FormatCryptString() {
+ storage_ = new char[32];
+ capacity_ = 32;
+ length_ = 0;
+ storage_[0] = 0;
+ }
+
+ void Append(const std::string & text) {
+ Append(text.data(), text.length());
+ }
+
+ void Append(const char * data, size_t length) {
+ EnsureStorage(length_ + length + 1);
+ memcpy(storage_ + length_, data, length);
+ length_ += length;
+ storage_[length_] = '\0';
+ }
+
+ void Append(const CryptString * password) {
+ size_t len = password->GetLength();
+ EnsureStorage(length_ + len + 1);
+ password->CopyTo(storage_ + length_, true);
+ length_ += len;
+ }
+
+ size_t GetLength() {
+ return length_;
+ }
+
+ const char * GetData() {
+ return storage_;
+ }
+
+
+ // Ensures storage of at least n bytes
+ void EnsureStorage(size_t n) {
+ if (capacity_ >= n) {
+ return;
+ }
+
+ size_t old_capacity = capacity_;
+ char * old_storage = storage_;
+
+ for (;;) {
+ capacity_ *= 2;
+ if (capacity_ >= n)
+ break;
+ }
+
+ storage_ = new char[capacity_];
+
+ if (old_capacity) {
+ memcpy(storage_, old_storage, length_);
+
+ // zero memory in a way that an optimizer won't optimize it out
+ old_storage[0] = 0;
+ for (size_t i = 1; i < old_capacity; i++) {
+ old_storage[i] = old_storage[i - 1];
+ }
+ delete[] old_storage;
+ }
+ }
+
+ ~FormatCryptString() {
+ if (capacity_) {
+ storage_[0] = 0;
+ for (size_t i = 1; i < capacity_; i++) {
+ storage_[i] = storage_[i - 1];
+ }
+ }
+ delete[] storage_;
+ }
+private:
+ char * storage_;
+ size_t capacity_;
+ size_t length_;
+};
+
+class InsecureCryptStringImpl : public CryptStringImpl {
+ public:
+ std::string& password() { return password_; }
+ const std::string& password() const { return password_; }
+
+ ~InsecureCryptStringImpl() override = default;
+ size_t GetLength() const override;
+ void CopyTo(char* dest, bool nullterminate) const override;
+ std::string UrlEncode() const override;
+ CryptStringImpl* Copy() const override;
+ void CopyRawTo(std::vector<unsigned char>* dest) const override;
+
+ private:
+ std::string password_;
+};
+
+}
+
+#endif // WEBRTC_RTC_BASE_CRYPTSTRING_H_