1 files changed, 103 insertions, 0 deletions
diff --git a/src/libs/3rdparty/botan/src/lib/filters/buf_filt.cpp b/src/libs/3rdparty/botan/src/lib/filters/buf_filt.cpp
new file mode 100644
index 00000000000..8acc6c74f9c
--- /dev/null
+++ b/src/libs/3rdparty/botan/src/lib/filters/buf_filt.cpp
@@ -0,0 +1,103 @@
+/*
+* Buffered Filter
+* (C) 1999-2007 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/buf_filt.h>
+#include <botan/mem_ops.h>
+#include <botan/internal/rounding.h>
+#include <botan/exceptn.h>
+
+namespace Botan {
+
+/*
+* Buffered_Filter Constructor
+*/
+Buffered_Filter::Buffered_Filter(size_t b, size_t f) :
+   m_main_block_mod(b), m_final_minimum(f)
+   {
+   if(m_main_block_mod == 0)
+      throw Invalid_Argument("m_main_block_mod == 0");
+
+   if(m_final_minimum > m_main_block_mod)
+      throw Invalid_Argument("m_final_minimum > m_main_block_mod");
+
+   m_buffer.resize(2 * m_main_block_mod);
+   m_buffer_pos = 0;
+   }
+
+/*
+* Buffer input into blocks, trying to minimize copying
+*/
+void Buffered_Filter::write(const uint8_t input[], size_t input_size)
+   {
+   if(!input_size)
+      return;
+
+   if(m_buffer_pos + input_size >= m_main_block_mod + m_final_minimum)
+      {
+      size_t to_copy = std::min<size_t>(m_buffer.size() - m_buffer_pos, input_size);
+
+      copy_mem(&m_buffer[m_buffer_pos], input, to_copy);
+      m_buffer_pos += to_copy;
+
+      input += to_copy;
+      input_size -= to_copy;
+
+      size_t total_to_consume =
+         round_down(std::min(m_buffer_pos,
+                             m_buffer_pos + input_size - m_final_minimum),
+                    m_main_block_mod);
+
+      buffered_block(m_buffer.data(), total_to_consume);
+
+      m_buffer_pos -= total_to_consume;
+
+      copy_mem(m_buffer.data(), m_buffer.data() + total_to_consume, m_buffer_pos);
+      }
+
+   if(input_size >= m_final_minimum)
+      {
+      size_t full_blocks = (input_size - m_final_minimum) / m_main_block_mod;
+      size_t to_copy = full_blocks * m_main_block_mod;
+
+      if(to_copy)
+         {
+         buffered_block(input, to_copy);
+
+         input += to_copy;
+         input_size -= to_copy;
+         }
+      }
+
+   copy_mem(&m_buffer[m_buffer_pos], input, input_size);
+   m_buffer_pos += input_size;
+   }
+
+/*
+* Finish/flush operation
+*/
+void Buffered_Filter::end_msg()
+   {
+   if(m_buffer_pos < m_final_minimum)
+      throw Exception("Buffered filter end_msg without enough input");
+
+   size_t spare_blocks = (m_buffer_pos - m_final_minimum) / m_main_block_mod;
+
+   if(spare_blocks)
+      {
+      size_t spare_bytes = m_main_block_mod * spare_blocks;
+      buffered_block(m_buffer.data(), spare_bytes);
+      buffered_final(&m_buffer[spare_bytes], m_buffer_pos - spare_bytes);
+      }
+   else
+      {
+      buffered_final(m_buffer.data(), m_buffer_pos);
+      }
+
+   m_buffer_pos = 0;
+   }
+
+}