source: orxonox.OLD/branches/terrain/src/lib/util/filesys/binary_file.cc @ 9336

#include "binary_file.h"
#include <ctype.h>
#include <stdlib.h>

int bytesize( const char _c )
{
        switch( _c) {
                case 'f':
                case 'i':
                        return 4;
                case 'b':
                        return 1;
                case 's':
                        return 2;
                default:
                        return 0;
        }
}

pDataSemantics BinaryFile::compileSemantics( const char *_semantics )
{
        const char *curr = _semantics;
        char *tmp = new char[strlen(_semantics)];
        //Find out how many subchunks exist.
        pDataSemantics chunk = new DataSemantics();
        bool terminated = false;
        int open = 0;
        while ( *curr ) {
                switch( *curr ) {
                        case 'i':
                        case 'f':
                        case 'b':
                        case 's':
                                chunk->numChunkNodes++;
                                break;
                        case '(':
                                terminated = false;
                                chunk->numChunkNodes++;
                                while ( *curr && terminated == false ) {
                                        if ( *curr == ')' )
                                                terminated = true;
                                        curr++;
                                }
                                if ( !terminated ) {
                                        printf( "Syntax error: ')' is missing" );
                                        delete chunk;
                                        return NULL;
                                }       
                                break;
                        default:
                                break;
                }
                curr++;
        }
        //Compile the chunks...
        chunk->chunks = new pDataSemantics[chunk->numChunkNodes];
        int currChunk = 0;
        curr = _semantics;
        while ( *curr ) {
                switch( *curr ) {
                        case 'i':
                        case 'f':
                        case 'b':
                        case 's':
                                chunk->chunks[currChunk] = new DataSemantics();
                                chunk->chunks[currChunk]->isTerminal = true;    
                                chunk->chunks[currChunk]->type = bytesize( *curr );
                                chunk->chunks[currChunk]->totalSize = bytesize( *curr );                                                
                                currChunk++;
                                break;
                        case '(':
                                curr++;
                                open = 0;
                                memset( tmp, 0, strlen( _semantics ) );
                                char * cp = tmp;
                                while ( *curr ) {
                                        if ( *curr == '(' )
                                                open++;
                                        if ( *curr == ')' ) {
                                                if ( open )
                                                        open--;
                                                else
                                                        break;
                                        }
                                        *cp = *curr;
                                        cp++;
                                        curr++;
                                }
                                *cp = '\0';
                                chunk->chunks[currChunk] = compileSemantics( tmp );
                                currChunk++;                                    
                                break;
                        case ')':
                                printf( "Syntax error: ')' shouldn't appear here\n" );
                                delete[] tmp; delete chunk;
                                return NULL;
                                break;
                        default:
                                int multiplier = 1, quantifier = 0;
                                const char *start = curr;
                                const char *end = curr;
                                while ( isdigit( *end ) ) {
                                        end++;
                                }
                                for ( const char *d = end-1; d >=start; --d ) {
                                        quantifier+=multiplier*(*d-'0');
                                        multiplier*=10;
                                }
                                if ( start == end ) {
                                        printf( "Syntax error: '%c' is not known.\n", *curr );
                                        delete[] tmp; delete chunk;
                                        return NULL;
                                }                               
                                if ( currChunk ) {
                                        chunk->chunks[currChunk-1]->quantifier = quantifier;
                                        chunk->chunks[currChunk-1]->totalSize*= quantifier;                                     
                                }       
                                else {
                                        printf( "Syntax error: Quantifier without a preceding type\n" );
                                        delete[] tmp; delete chunk;
                                        return NULL;
                                }
                                curr = end-1;
                                break;
                }
                curr++;
        }
        for ( int i = 0; i < chunk->numChunkNodes; ++i ) {
                chunk->totalSize+= chunk->chunks[i]->totalSize;
        }
        delete[] tmp;
        return chunk;
}

void convert_data( pDataSemantics _comp, void *_data )
{
        char *ptr = (char*)_data;
        short *sptr;
        int *iptr;
        if ( _comp->isTerminal ) {
                switch( _comp->type ) {
                        case TT_INT:
                                iptr = (int*)ptr;                       
                                for ( int i = 0; i < _comp->quantifier; ++i ) {
                                        swap32( iptr );
                                        iptr++;
                                }
                                break;
                        case TT_SHORT:
                                sptr = (short*)ptr;
                                for ( int i = 0; i < _comp->quantifier; ++i ) {
                                        swap16( sptr );
                                        sptr++;
                                }                       
                                break;
                        case TT_BYTE:
                                break;
                }
        }
        else {
                for ( int j = 0; j < _comp->quantifier; ++j ) {
                        for ( int i = 0; i < _comp->numChunkNodes; ++i ) {
                                convert_data( _comp->chunks[i], ptr );
                                ptr+= _comp->chunks[i]->totalSize;
                        }                       
                }

        }       
}
void BinaryFile::read( const char *_semantics, int _chunks, 
        void* _buf, size_t& _bytesRead )
{
        pDataSemantics comp = compileSemantics( _semantics );           
        fread( _buf, comp->totalSize, _chunks, this->handle() );
        if ( byteorder != NATIVE_BYTEORDER ) {
                for ( int i = 0; i < _chunks; ++i ) {
                        convert_data( comp, (char*)_buf+i*comp->totalSize );
                }       
        }       
        _bytesRead = comp->totalSize*_chunks;
        delete comp;    
}
void BinaryFile::read( const char *_semantics, 
        void* _buf, size_t& _bytesRead )
{
        pDataSemantics comp = compileSemantics( _semantics );           
        fread( _buf, comp->totalSize, 1, this->handle() );
        
        if ( byteorder != NATIVE_BYTEORDER ) {
                convert_data( comp, _buf );
        }       
        delete comp;            
}

void BinaryFile::write( const char *_semantics, 
        void* _buf, size_t& _bytesWritten )
{
        pDataSemantics comp = compileSemantics( _semantics );
        if ( byteorder != NATIVE_BYTEORDER ) {
                convert_data( comp, _buf );
        }       
        _bytesWritten = comp->totalSize;
        fwrite( _buf, comp->totalSize, 1, this->handle() );
        delete comp;
}