Hi, Adam
Your answer is very helpful. Thanks.
1. I tried increase the size of array like that.
char * compressedMsg = new char[1000];
io::ArrayOutputStream aos(compressedMsg, 1000);
works.
2. Instead of using ArrayOutputStream, StringOutputStream works also.
Thanks again.
2019년 7월 9일 화요일 오전 7시 0분 55초 UTC+9, Adam Cozzette 님의 말:
>
> I suspect the problem is that the array you're creating for the serialized
> data is too small. That message's serialized size is only 2 bytes, so
> gzipping it will likely increase the size, and the gzipped data will not
> fit in a 2-byte array. I would recommend serializing to a std::string using
> a StringOutputStream, since that will automatically resize the string.
>
> On Thu, Jul 4, 2019 at 3:13 AM HyonChang Lim <[email protected]
> <javascript:>> wrote:
>
>> I'm testing protobuf with zlib compression.
>>
>>
>> I wrote some c++ sample code using protobuf 3.8.0, but the following
>> error occurred at calling ParseFromZeroCopyStream() at Ubuntu.
>>
>>
>> terminate called after throwing an instance of 'std::system_error'
>> what(): Unknown error -1(core dumped)
>>
>>
>> what can I do?
>>
>>
>> I tried to replace ParseFromZeroCopyStream() with
>> ParseFromBoundedZeroCopyStream(). That results in no core dump, but
>> ParseFromBoundedZeroCopyStream() returned false.
>>
>>
>> *test.proto*
>>
>> syntax = "proto2";
>> package test;
>>
>> message Msg{
>> required uint32 data = 1;}
>>
>>
>> *test.cc*
>>
>> #include <iostream>#include
>> <google/protobuf/io/zero_copy_stream_impl.h>#include
>> <google/protobuf/io/zero_copy_stream_impl_lite.h>#include
>> <google/protobuf/io/gzip_stream.h>#include "test.pb.h"
>> using namespace std;using namespace google::protobuf;using namespace test;
>> int main(void){
>> Msg srcMsg;
>> srcMsg.set_data(1);
>>
>> long sSize = srcMsg.ByteSizeLong();
>> cout << "SerializedSize = " << sSize << endl;
>>
>> char * compressedMsg = new char[sSize];
>> io::ArrayOutputStream aos(compressedMsg, sSize);
>> io::GzipOutputStream gos(&aos);
>>
>> long cSize;
>> if (srcMsg.SerializeToZeroCopyStream(&gos) == true)
>> {
>> gos.Close();
>> cSize = aos.ByteCount();
>> cout << "compression success : " << cSize << " bytes" << endl;
>> }
>> else
>> {
>> cout << "compression error" << endl;
>> return 1;
>> }
>>
>> Msg targetMsg;
>>
>> io::ArrayInputStream ais(compressedMsg, cSize);
>> io::GzipInputStream gis(&ais);
>>
>> if (targetMsg.ParseFromZeroCopyStream(&gis) == false)
>> {
>> cout << "decompression error" << endl;
>> }
>> else
>> {
>> cout << "decompression success : " << targetMsg.ByteSizeLong() << "
>> bytes" << endl;
>> cout << "data = " << targetMsg.data() << endl;
>> }
>>
>> delete[] compressedMsg;
>>
>> return 0;}
>>
>>
>> I expect that decompression succeeds.
>>
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