test: add test infrastructure for cpp decoder

cpp/test/Makefile

@@ -0,0 +1,2 @@
+all:
+	g++ -lzfp -Izfp-1.0.0/include -std=c++14 main.cpp -o test

cpp/test/main.cpp

@@ -0,0 +1,42 @@
+#include "zfp.hpp"
+#include "zfpc.hpp"
+#include <cstdio>
+
+
+#include <fstream>
+#include <sstream>
+#include <string>
+
+std::string slurp(const char *filename) {
+    std::ifstream in;
+    in.open(filename, std::ifstream::in | std::ifstream::binary);
+    std::stringstream sstr;
+    sstr << in.rdbuf();
+    in.close();
+    return sstr.str();
+}
+
+
+int main () {
+	std::string data = slurp("/Users/wms/code/zfpc/wasm/0-128_0-128_0-10");
+
+
+	size_t voxels = 128 * 128 * 10 * 2;
+	float* out = new float[voxels]();
+	const unsigned char* ptr = reinterpret_cast<unsigned char*>(const_cast<char*>(data.c_str()));
+
+	int err = zfpc::decompress(ptr, data.size(), out, voxels * 4);
+
+	std::ofstream f;
+	f.open("/Users/wms/code/zfpc/wasm/0-128_0-128_0-10.raw");
+
+	unsigned char* outc = reinterpret_cast<unsigned char*>(out);
+
+	for (int i = 0; i < voxels * 4; i++) {
+		f << outc[i];
+	}
+
+	f.close();
+
+	return 0;
+}

cpp/test/test.py

@@ -0,0 +1,9 @@
+import numpy as np
+from cloudvolume import view
+import zfpy
+
+data = open("0-128_0-128_0-10-1.zfp", "rb").read()
+img = zfpy.decompress_numpy(data)
+
+print(img)
+view(img, port=8081)