#include "buffered_reader.h"
#include <utility>
#include <algorithm>
#include <string>
PackageStream::PackageStream(std::string source, int32_t package_len) :
source(std::move(source)), package_len_(package_len) {
}
int32_t PackageStream::PackageLen() const {
return this->package_len_;
}
int32_t PackageStream::ReadPackage(char *output_package) {
memcpy(output_package, this->source.c_str(), this->PackageLen());
int32_t real_size = std::min(static_cast<int>(this->source.size()),
this->PackageLen());
this->source.erase(this->source.begin(),
this->source.begin() + real_size);
return real_size;
}
class BufferedReader {
public:
explicit BufferedReader(PackageStream *stream) : stream(stream) {
}
int32_t Read(char *output_buffer, int32_t buffer_len) {
this->stream->package_len_ = buffer_len;
return this->stream->ReadPackage(output_buffer);
}
private:
PackageStream *stream;
};