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164 lines
4.7 KiB
164 lines
4.7 KiB
/*
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* libjingle
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* Copyright 2004--2005, Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _XMPPPASSWORD_H_
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#define _XMPPPASSWORD_H_
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#include "talk/base/linked_ptr.h"
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#include "talk/base/scoped_ptr.h"
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namespace buzz {
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class XmppPasswordImpl {
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public:
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virtual ~XmppPasswordImpl() {}
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virtual size_t GetLength() const = 0;
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virtual void CopyTo(char * dest, bool nullterminate) const = 0;
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virtual std::string UrlEncode() const = 0;
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virtual XmppPasswordImpl * Copy() const = 0;
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};
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class EmptyXmppPasswordImpl : public XmppPasswordImpl {
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public:
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virtual ~EmptyXmppPasswordImpl() {}
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virtual size_t GetLength() const { return 0; }
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virtual void CopyTo(char * dest, bool nullterminate) const {
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if (nullterminate) {
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*dest = '\0';
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}
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}
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virtual std::string UrlEncode() const { return ""; }
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virtual XmppPasswordImpl * Copy() const { return new EmptyXmppPasswordImpl(); }
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};
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class XmppPassword {
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public:
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XmppPassword() : impl_(new EmptyXmppPasswordImpl()) {}
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size_t GetLength() const { return impl_->GetLength(); }
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void CopyTo(char * dest, bool nullterminate) const { impl_->CopyTo(dest, nullterminate); }
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XmppPassword(const XmppPassword & other) : impl_(other.impl_->Copy()) {}
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explicit XmppPassword(const XmppPasswordImpl & impl) : impl_(impl.Copy()) {}
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XmppPassword & operator=(const XmppPassword & other) {
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if (this != &other) {
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impl_.reset(other.impl_->Copy());
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}
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return *this;
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}
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void Clear() { impl_.reset(new EmptyXmppPasswordImpl()); }
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std::string UrlEncode() const { return impl_->UrlEncode(); }
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private:
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scoped_ptr<const XmppPasswordImpl> impl_;
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};
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// Used for constructing strings where a password is involved and we
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// need to ensure that we zero memory afterwards
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class FormatXmppPassword {
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public:
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FormatXmppPassword() {
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storage_ = new char[32];
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capacity_ = 32;
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length_ = 0;
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storage_[0] = 0;
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}
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void Append(const std::string & text) {
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Append(text.data(), text.length());
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}
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void Append(const char * data, size_t length) {
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EnsureStorage(length_ + length + 1);
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memcpy(storage_ + length_, data, length);
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length_ += length;
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storage_[length_] = '\0';
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}
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void Append(const XmppPassword * password) {
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size_t len = password->GetLength();
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EnsureStorage(length_ + len + 1);
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password->CopyTo(storage_ + length_, true);
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length_ += len;
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}
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size_t GetLength() {
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return length_;
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}
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const char * GetData() {
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return storage_;
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}
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// Ensures storage of at least n bytes
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void EnsureStorage(size_t n) {
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if (capacity_ >= n) {
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return;
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}
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size_t old_capacity = capacity_;
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char * old_storage = storage_;
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for (;;) {
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capacity_ *= 2;
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if (capacity_ >= n)
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break;
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}
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storage_ = new char[capacity_];
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if (old_capacity) {
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memcpy(storage_, old_storage, length_);
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// zero memory in a way that an optimizer won't optimize it out
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old_storage[0] = 0;
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for (size_t i = 1; i < old_capacity; i++) {
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old_storage[i] = old_storage[i - 1];
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}
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delete[] old_storage;
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}
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}
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~FormatXmppPassword() {
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if (capacity_) {
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storage_[0] = 0;
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for (size_t i = 1; i < capacity_; i++) {
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storage_[i] = storage_[i - 1];
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}
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}
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delete[] storage_;
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}
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private:
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char * storage_;
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size_t capacity_;
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size_t length_;
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};
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}
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#endif
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