test: add an zlib binding addon test

Add a test addon that makes use of the zlib implementation bundled with node, checking that a compression/decompression round-trip works. This is largely based on the already-existing OpenSSL addon. Fixes: #7535 PR-URL: #8039 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Colin Ihrig <[email protected]>

Author: addaleax

test/addons/zlib-binding/binding.cc

@@ -0,0 +1,55 @@
+#include<node.h>
+#include<node_buffer.h>
+#include<assert.h>
+#include<zlib.h>
+
+namespace{
+
+inlinevoidCompressBytes(const v8::FunctionCallbackInfo<v8::Value>& info){
+assert(info[0]->IsArrayBufferView());
+auto view = info[0].As<v8::ArrayBufferView>();
+auto byte_offset = view->ByteOffset();
+auto byte_length = view->ByteLength();
+assert(view->HasBuffer());
+auto buffer = view->Buffer();
+auto contents = buffer->GetContents();
+auto data = static_cast<unsignedchar*>(contents.Data()) + byte_offset;
+
+ Bytef buf[1024];
+
+ z_stream stream;
+ stream.zalloc = nullptr;
+ stream.zfree = nullptr;
+
+int err = deflateInit2(&stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
+ -15, MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);
+assert(err == Z_OK);
+
+ stream.avail_in = byte_length;
+ stream.next_in = data;
+ stream.avail_out = sizeof(buf);
+ stream.next_out = buf;
+ err = deflate(&stream, Z_FINISH);
+assert(err == Z_STREAM_END);
+
+auto result = node::Buffer::Copy(info.GetIsolate(),
+reinterpret_cast<constchar*>(buf),
+sizeof(buf) - stream.avail_out);
+
+deflateEnd(&stream);
+
+ info.GetReturnValue().Set(result.ToLocalChecked());
+}
+
+inlinevoidInitialize(v8::Local<v8::Object> exports,
+ v8::Local<v8::Value> module,
+ v8::Local<v8::Context> context){
+auto isolate = context->GetIsolate();
+auto key = v8::String::NewFromUtf8(isolate, "compressBytes");
+auto value = v8::FunctionTemplate::New(isolate, CompressBytes)->GetFunction();
+assert(exports->Set(context, key, value).IsJust());
+}
+
+} // anonymous namespace
+
+NODE_MODULE_CONTEXT_AWARE(binding, Initialize)

test/addons/zlib-binding/binding.gyp

@@ -0,0 +1,9 @@
+{
+'targets': [
+{
+'target_name': 'binding',
+'sources': ['binding.cc'],
+'include_dirs': ['../../../deps/zlib'],
+ },
+ ]
+}

test/addons/zlib-binding/test.js

@@ -0,0 +1,11 @@
+'use strict';
+
+require('../../common');
+constassert=require('assert');
+constzlib=require('zlib');
+constbinding=require('./build/Release/binding');
+
+constinput=Buffer.from('Hello, World!');
+
+constoutput=zlib.inflateRawSync(binding.compressBytes(input));
+assert.deepStrictEqual(input,output);