1 files changed, 59 insertions, 8 deletions
diff --git a/contrib/epee/src/byte_slice.cpp b/contrib/epee/src/byte_slice.cpp
index 3ad3b3e7e..faf7689be 100644
--- a/contrib/epee/src/byte_slice.cpp
+++ b/contrib/epee/src/byte_slice.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2019, The Monero Project
+// Copyright (c) 2019-2020, The Monero Project
 //
 // All rights reserved.
 //
@@ -34,6 +34,7 @@
 #include <utility>
 
 #include "byte_slice.h"
+#include "byte_stream.h"
 
 namespace epee
 {
@@ -117,6 +118,12 @@ namespace epee
     }
   } // anonymous
 
+  void release_byte_buffer::operator()(std::uint8_t* buf) const noexcept
+  {
+    if (buf)
+      std::free(buf - sizeof(raw_byte_slice));
+  }
+
   byte_slice::byte_slice(byte_slice_data* storage, span<const std::uint8_t> portion) noexcept
     : storage_(storage), portion_(portion)
   {
@@ -126,10 +133,13 @@ namespace epee
 
   template<typename T>
   byte_slice::byte_slice(const adapt_buffer, T&& buffer)
-    : storage_(nullptr), portion_(to_byte_span(to_span(buffer)))
+    : storage_(nullptr), portion_(nullptr)
   {
     if (!buffer.empty())
+    {
       storage_ = allocate_slice<adapted_byte_slice<T>>(0, std::move(buffer));
+      portion_ = to_byte_span(to_span(static_cast<adapted_byte_slice<T> *>(storage_.get())->buffer));
+    }
   }
 
   byte_slice::byte_slice(std::initializer_list<span<const std::uint8_t>> sources)
@@ -163,6 +173,19 @@ namespace epee
     : byte_slice(adapt_buffer{}, std::move(buffer))
   {}
 
+  byte_slice::byte_slice(byte_stream&& stream) noexcept
+    : storage_(nullptr), portion_(stream.data(), stream.size())
+  {
+    if (stream.size())
+    {
+      std::uint8_t* const data = stream.take_buffer().release() - sizeof(raw_byte_slice);
+      new (data) raw_byte_slice{};
+      storage_.reset(reinterpret_cast<raw_byte_slice*>(data));
+    }
+    else
+      portion_ = nullptr;
+  }
+
   byte_slice::byte_slice(byte_slice&& source) noexcept
     : storage_(std::move(source.storage_)), portion_(source.portion_)
   {
@@ -190,14 +213,17 @@ namespace epee
   byte_slice byte_slice::take_slice(const std::size_t max_bytes) noexcept
   {
     byte_slice out{};
-    std::uint8_t const* const ptr = data();
-    out.portion_ = {ptr, portion_.remove_prefix(max_bytes)};
 
-    if (portion_.empty())
-      out.storage_ = std::move(storage_); // no atomic inc/dec
-    else
-      out = {storage_.get(), out.portion_};
+    if (max_bytes)
+    {
+      std::uint8_t const* const ptr = data();
+      out.portion_ = {ptr, portion_.remove_prefix(max_bytes)};
 
+      if (portion_.empty())
+        out.storage_ = std::move(storage_); // no atomic inc/dec
+      else
+        out = {storage_.get(), out.portion_};
+    }
     return out;
   }
 
@@ -217,4 +243,29 @@ namespace epee
     portion_ = nullptr;
     return out;
   }
+
+  byte_buffer byte_buffer_resize(byte_buffer buf, const std::size_t length) noexcept
+  {
+    if (std::numeric_limits<std::size_t>::max() - sizeof(raw_byte_slice) < length)
+      return nullptr;
+
+    std::uint8_t* data = buf.get();
+    if (data != nullptr)
+      data -= sizeof(raw_byte_slice);
+
+    data = static_cast<std::uint8_t*>(std::realloc(data, sizeof(raw_byte_slice) + length));
+    if (data == nullptr)
+      return nullptr;
+
+    buf.release();
+    buf.reset(data + sizeof(raw_byte_slice));
+    return buf;
+  }
+
+  byte_buffer byte_buffer_increase(byte_buffer buf, const std::size_t current, const std::size_t more)
+  {
+    if (std::numeric_limits<std::size_t>::max() - current < more)
+      throw std::range_error{"byte_buffer_increase size_t overflow"};
+    return byte_buffer_resize(std::move(buf), current + more);
+  }
 } // epee