1 files changed, 79 insertions, 0 deletions
diff --git a/hostTools/lzma/compress/7zlzma.cpp b/hostTools/lzma/compress/7zlzma.cpp
new file mode 100644
index 0000000..35468c1
--- /dev/null
+++ b/hostTools/lzma/compress/7zlzma.cpp
@@ -0,0 +1,79 @@
+#include "7z.h"
+
+#include "LZMAEncoder.h"
+#include "LZMADecoder.h"
+
+bool compress_lzma_7z(const unsigned char* in_data, 
+                      unsigned in_size, 
+                      unsigned char* out_data, 
+                      unsigned& out_size, 
+                      unsigned algo, 
+                      unsigned dictionary_size, 
+                      unsigned num_fast_bytes) throw () {
+	try {
+		NCompress::NLZMA::CEncoder cc;
+
+		// reduce the dictionary size if the file is small
+		while (dictionary_size > 8 && dictionary_size / 2 >= out_size)
+			dictionary_size /= 2;
+
+		if (cc.SetDictionarySize(dictionary_size) != S_OK)
+			return false;
+
+		if (cc.SetEncoderNumFastBytes(num_fast_bytes) != S_OK)
+			return false;
+
+		if (cc.SetEncoderAlgorithm(algo) != S_OK)
+			return false;
+
+		ISequentialInStream in(reinterpret_cast<const char*>(in_data), in_size);
+		ISequentialOutStream out(reinterpret_cast<char*>(out_data), out_size);
+
+		UINT64 in_size_l = in_size;
+
+		if (cc.WriteCoderProperties(&out) != S_OK)
+			return false;
+
+		if (cc.Code(&in, &out, &in_size_l) != S_OK)
+			return false;
+
+		out_size = out.size_get();
+
+		if (out.overflow_get())
+			return false;
+
+		return true;
+	} catch (...) {
+		return false;
+	}
+}
+#if 0
+bool decompress_lzma_7z(const unsigned char* in_data, 
+                        unsigned in_size, 
+                        unsigned char* out_data, 
+                        unsigned out_size) throw () {
+	try {
+		NCompress::NLZMA::CDecoder cc;
+
+		ISequentialInStream in(reinterpret_cast<const char*>(in_data), in_size);
+		ISequentialOutStream out(reinterpret_cast<char*>(out_data), out_size);
+
+		UINT64 in_size_l = in_size;
+		UINT64 out_size_l = out_size;
+
+		if (cc.ReadCoderProperties(&in) != S_OK)
+			return false;
+
+		if (cc.Code(&in, &out, &in_size_l, &out_size_l) != S_OK)
+			return false;
+
+		if (out.size_get() != out_size || out.overflow_get())
+			return false;
+
+		return true;
+	} catch (...) {
+		return false;
+	}
+}
+#endif
+