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#include "LibMagicTypeDetect.hpp"
#include "Logger.hpp"
#include <stdexcept>
#include <cstdlib>
LibMagicTypeDetect::LibMagicTypeDetect( )
{
m_magic = magic_open( MAGIC_MIME_TYPE | MAGIC_CONTINUE );
if( m_magic == NULL ) {
throw runtime_error( "Unable to open magic file" );
}
if( magic_load( m_magic, NULL ) != 0 ) {
throw runtime_error( "Unable to load standard magic file database" );
}
}
LibMagicTypeDetect::~LibMagicTypeDetect( )
{
magic_close( m_magic );
}
MIMEType LibMagicTypeDetect::detect( RewindInputStream *s )
{
enum { CHUNKSIZE = 65535 };
enum { MAXBUFSIZE = 1024 * 1024 * 16 };
size_t bufsize = 0;
char *buf = (char *)malloc( CHUNKSIZE );
size_t offset = 0;
const char *res = 0;
MIMEType type;
while( s->good( ) && !s->eof( ) ) {
s->read( buf + offset, CHUNKSIZE );
std::streamsize n = s->gcount( );
res = magic_buffer( m_magic, buf, bufsize + n );
if( res != NULL ) {
type = MIMEType( res );
if( type != MIMEType::Null ) {
break;
}
}
bufsize += CHUNKSIZE;
offset += CHUNKSIZE;
if( bufsize > MAXBUFSIZE ) {
break;
}
buf = (char *)realloc( buf, bufsize );
}
free( buf );
if( res == NULL ) {
return MIMEType::Null;
}
return MIMEType( res );
}
REGISTER_MODULE( "libmagic_typedetect", TypeDetect, LibMagicTypeDetect )
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