1 files changed, 95 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/compression/lzma/lzma.cpp b/comm/third_party/botan/src/lib/compression/lzma/lzma.cpp
new file mode 100644
index 0000000000..73bb9eb89f
--- /dev/null
+++ b/comm/third_party/botan/src/lib/compression/lzma/lzma.cpp
@@ -0,0 +1,95 @@
+/*
+* Lzma Compressor
+* (C) 2001 Peter J Jones
+*     2001-2007,2014 Jack Lloyd
+*     2006 Matt Johnston
+*     2012 Vojtech Kral
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/lzma.h>
+#include <botan/internal/compress_utils.h>
+#include <botan/exceptn.h>
+#include <lzma.h>
+
+namespace Botan {
+
+namespace {
+
+class LZMA_Stream : public Zlib_Style_Stream<lzma_stream, uint8_t>
+   {
+   public:
+      LZMA_Stream()
+         {
+         m_allocator.opaque = alloc();
+         m_allocator.alloc = Compression_Alloc_Info::malloc<size_t>;
+         m_allocator.free = Compression_Alloc_Info::free;
+         streamp()->allocator = &m_allocator;
+         }
+
+      ~LZMA_Stream()
+         {
+         ::lzma_end(streamp());
+         }
+
+      bool run(uint32_t flags) override
+         {
+         lzma_ret rc = ::lzma_code(streamp(), static_cast<lzma_action>(flags));
+
+         if(rc != LZMA_OK && rc != LZMA_STREAM_END)
+            throw Compression_Error("lzma_code", ErrorType::LzmaError, rc);
+
+         return (rc == LZMA_STREAM_END);
+         }
+
+      uint32_t run_flag() const override { return LZMA_RUN; }
+      uint32_t flush_flag() const override { return LZMA_FULL_FLUSH; }
+      uint32_t finish_flag() const override { return LZMA_FINISH; }
+   private:
+      ::lzma_allocator m_allocator;
+   };
+
+class LZMA_Compression_Stream final : public LZMA_Stream
+   {
+   public:
+      explicit LZMA_Compression_Stream(size_t level)
+         {
+         if(level == 0)
+            level = 6; // default
+         else if(level > 9)
+            level = 9; // clamp to maximum allowed value
+
+         lzma_ret rc = ::lzma_easy_encoder(streamp(), level, LZMA_CHECK_CRC64);
+
+         if(rc != LZMA_OK)
+            throw Compression_Error("lzam_easy_encoder", ErrorType::LzmaError, rc);
+         }
+   };
+
+class LZMA_Decompression_Stream final : public LZMA_Stream
+   {
+   public:
+      LZMA_Decompression_Stream()
+         {
+         lzma_ret rc = ::lzma_stream_decoder(streamp(), UINT64_MAX,
+                                             LZMA_TELL_UNSUPPORTED_CHECK);
+
+         if(rc != LZMA_OK)
+            throw Compression_Error("lzma_stream_decoder", ErrorType::LzmaError, rc);
+         }
+   };
+
+}
+
+Compression_Stream* LZMA_Compression::make_stream(size_t level) const
+   {
+   return new LZMA_Compression_Stream(level);
+   }
+
+Compression_Stream* LZMA_Decompression::make_stream() const
+   {
+   return new LZMA_Decompression_Stream;
+   }
+
+}