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45 #include "grfmt_base.h"
48 ///////////////////// GrFmtReader //////////////////////////
50 GrFmtReader::GrFmtReader()
52 m_width = m_height = -1;
60 void GrFmtReader::SetFile( const char* filename )
62 assert( filename != 0 && strlen(filename) < sizeof(m_filename) );
63 strcpy( m_filename, filename );
67 bool GrFmtReader::CheckFormat( const char* signature )
69 assert( signature != 0 );
70 return memcmp( m_signature, signature, m_sign_len ) == 0;
74 ///////////////////// GrFmtReader_list //////////////////////////
76 GrFmtReadersList::GrFmtReadersList()
83 GrFmtReadersList::~GrFmtReadersList()
89 void GrFmtReadersList::RemoveAllReaders()
93 for( int i = 0; i < m_curReaders; i++ ) delete m_readers[i];
97 m_maxReaders = m_curReaders = 0;
101 void GrFmtReadersList::AddReader( GrFmtReader* reader )
103 assert( reader != 0 );
104 if( m_curReaders == m_maxReaders )
106 // reallocate the readers pointers storage
107 int new_maxReaders = 2*m_maxReaders;
108 if( new_maxReaders < 16 ) new_maxReaders = 16;
110 GrFmtReader** newReaders =
111 new GrFmtReader*[new_maxReaders];
113 for( int i = 0; i < m_curReaders; i++ ) newReaders[i] = m_readers[i];
116 m_readers = newReaders;
117 m_maxReaders = new_maxReaders;
120 m_readers[m_curReaders++] = reader;
124 ListPosition* GrFmtReadersList::GetFirstReaderPos()
126 return (ListPosition*)m_readers;
130 GrFmtReader* GrFmtReadersList::
131 GetNextReader( ListPosition*& pos )
133 GrFmtReader* reader = 0;
134 GrFmtReader** temp = (GrFmtReader**)pos;
136 assert( temp == 0 || (m_readers <= temp && temp < m_readers + m_curReaders));
140 pos = (ListPosition*)(temp < m_readers + m_curReaders ? temp : 0);
146 GrFmtReader* GrFmtReadersList::
147 FindReader( const char* filename )
150 FILE* f = fopen( filename, "rb" );
151 char signature[4096];
153 GrFmtReader* reader = 0;
157 for( i = 0; i < m_curReaders; i++ )
159 int temp = m_readers[i]->GetSignatureLength();
160 if( temp > sign_len ) sign_len = temp;
163 assert( sign_len <= sizeof(signature) );
165 sign_len = fread( signature, 1, sign_len, f );
168 for( i = 0; i < m_curReaders; i++ )
170 int temp = m_readers[i]->GetSignatureLength();
171 if( temp <= sign_len && m_readers[i]->CheckFormat(signature))
173 reader = m_readers[i];
182 int GrFmtReadersList::GetFiltersString( char* buffer, int maxlen )