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source/detail/vector_streambuf.hpp

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+// Copyright (c) 2016 Thomas Fussell
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, WRISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE
+//
+// @license: http://www.opensource.org/licenses/mit-license.php
+// @author: see AUTHORS file
+#pragma once
+
+#include <iostream>
+#include <vector>
+
+namespace xlnt {
+namespace detail {
+
+/// <summary>
+/// Allows a std::vector to be read through a std::istream.
+/// </summary>
+class vector_istreambuf : public std::streambuf
+{
+    using int_type = std::streambuf::int_type;
+
+public:
+    vector_istreambuf(const std::vector<std::uint8_t> &data)
+        : data_(data),
+          position_(0)
+    {
+    }
+
+    vector_istreambuf(const vector_istreambuf &) = delete;
+    vector_istreambuf &operator=(const vector_istreambuf &) = delete;
+
+private:
+    int_type underflow()
+    {
+        return (position_ == static_cast<std::streampos>(data_.size()))
+            ? traits_type::eof() : traits_type::to_int_type(data_[position_]);
+    }
+
+    int_type uflow()
+    {
+        if (position_ == static_cast<std::streampos>(data_.size()))
+        {
+            return traits_type::eof();
+        }
+
+        auto previous = position_;
+        position_ += 1;
+
+        return traits_type::to_int_type(data_[previous]);
+    }
+
+    int_type pbackfail(int_type ch)
+    {
+        if (position_ == std::streampos(0) || (ch != traits_type::eof() && ch != data_[position_ - std::streampos(1)]))
+        {
+            return traits_type::eof();
+        }
+
+        auto old_pos = position_;
+        position_ -= 1;
+
+        return traits_type::to_int_type(data_[position_]);
+    }
+
+    std::streamsize showmanyc()
+    {
+        return position_ < data_.size() ? data_.size() - position_ : -1;
+    }
+
+    std::streampos seekoff(std::streamoff off,
+        std::ios_base::seekdir way,
+        std::ios_base::openmode which = std::ios_base::in | std::ios_base::out)
+    {
+        if (way == std::ios_base::beg)
+        {
+            position_ = 0;
+        }
+        else if (way == std::ios_base::end)
+        {
+            position_ = data_.size();
+        }
+
+        position_ += off;
+
+        if (position_ < 0) return -1;
+        if (position_ > data_.size()) return -1;
+
+        return position_;
+    }
+
+    std::streampos seekpos(std::streampos sp,
+        std::ios_base::openmode which = std::ios_base::in | std::ios_base::out)
+    {
+        return position_ = sp;
+    }
+
+private:
+    const std::vector<std::uint8_t> &data_;
+    std::streampos position_;
+};
+
+/// <summary>
+/// Allows a std::vector to be written through a std::ostream.
+/// </summary>
+class vector_ostreambuf : public std::streambuf
+{
+    using int_type = std::streambuf::int_type;
+
+public:
+    vector_ostreambuf(std::vector<std::uint8_t> &data)
+        : data_(data),
+          position_(0)
+    {
+    }
+
+    vector_ostreambuf(const vector_ostreambuf &) = delete;
+    vector_ostreambuf &operator=(const vector_ostreambuf &) = delete;
+
+private:
+    int_type overflow(int_type c = traits_type::eof())
+    {
+        if (c != traits_type::eof())
+        {
+            data_.push_back(c);
+            position_ = data_.size() - 1;
+        }
+
+        return traits_type::to_int_type(data_[position_]);
+    }
+
+    std::streamsize xsputn(const char *s, std::streamsize n)
+    {
+        if (data_.empty())
+        {
+            data_.resize(n);
+        }
+        else
+        {
+            auto position_size = data_.size();
+            auto required_size = static_cast<std::size_t>(position_ + n);
+            data_.resize(std::max(position_size, required_size));
+        }
+
+        std::copy(s, s + n, data_.begin() + position_);
+        position_ += n;
+
+        return n;
+    }
+
+    std::streampos seekoff(std::streamoff off, std::ios_base::seekdir way,
+        std::ios_base::openmode which = std::ios_base::in | std::ios_base::out)
+    {
+        if (way == std::ios_base::beg)
+        {
+            position_ = off;
+        }
+        else if (way == std::ios_base::cur)
+        {
+            position_ += off;
+        }
+        else if (way == std::ios_base::end)
+        {
+            position_ = data_.size();
+        }
+
+        return (position_ < 0 || position_ > data_.size()) ? -1 : position_;
+    }
+
+    std::streampos seekpos(std::streampos sp,
+        std::ios_base::openmode which = std::ios_base::in | std::ios_base::out)
+    {
+        position_ = sp;
+        return (position_ < 0 || position_ > data_.size()) ? -1 : position_;
+    }
+
+private:
+    std::vector<std::uint8_t> &data_;
+    std::streampos position_;
+};
+
+} // namespace detail
+} // namespace xlnt