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export.cpp
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export.cpp
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#include <string>
#include <stdexcept>
#include "seekgzip.h"
#include "export.h"
static std::string error_string(int errorcode)
{
switch (errorcode) {
case SEEKGZIP_SUCCESS:
return "";
case SEEKGZIP_OPENERROR:
return "Failed to open a file";
case SEEKGZIP_READERROR:
return "Failed to read from a file";
case SEEKGZIP_WRITEERROR:
return "Failed to write to a file";
case SEEKGZIP_DATAERROR:
return "Data error";
case SEEKGZIP_OUTOFMEMORY:
return "Out of memory";
case SEEKGZIP_IMCOMPATIBLE:
return "Imcompatible data format";
case SEEKGZIP_ZLIBERROR:
return "ZLIB error";
default:
case SEEKGZIP_ERROR:
return "Unknown error";
}
}
reader::reader(const char *filename)
{
int err = 0;
seekgzip_t* sgz = seekgzip_open(filename, &err);
m_obj = sgz;
if (sgz == NULL) {
throw std::invalid_argument(error_string(err));
}
}
reader::~reader()
{
this->close();
}
void reader::close()
{
if (m_obj != NULL) {
seekgzip_close(reinterpret_cast<seekgzip_t*>(m_obj));
m_obj = NULL;
}
}
void reader::seek(long long offset)
{
if (m_obj != NULL) {
seekgzip_seek(
reinterpret_cast<seekgzip_t*>(m_obj),
offset
);
}
}
long long reader::tell()
{
if (m_obj != NULL) {
return seekgzip_tell(
reinterpret_cast<seekgzip_t*>(m_obj)
);
} else {
return -1;
}
}
std::string reader::read(int size)
{
std::string ret;
if (m_obj != NULL) {
char *buffer = new char[size+1];
int n = seekgzip_read(
reinterpret_cast<seekgzip_t*>(m_obj),
buffer,
size
);
buffer[n] = 0;
ret = buffer;
delete[] buffer;
}
return ret;
}