76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
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#include "frames.h"
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#include <string.h>
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char* Frame::getString( int offset, int length ) {
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char* data = new char[length];
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strncpy( data, &bytes[offset], length );
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data[length] = 0; // Properly terminate the returned string
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return data;
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}
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int Frame::getInt32( int offset ) {
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return *reinterpret_cast<int*>( &bytes[offset] );
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}
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int Frame::getInt16( int offset ) {
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return *reinterpret_cast<short int*>( &bytes[offset] );
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}
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void Frame::putInt32( int offset, int value ) {
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for( int i = 0; i < 4; i++ ) {
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bytes[offset + i] = ( value & ( 0xFF << ( 8 * i ) ) ) >> ( 8 * i );
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}
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}
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void Frame::putInt16( int offset, int value ) {
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for( int i = 0; i < 2; i++ ) {
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bytes[offset + i] = ( value & ( 0xFF << ( 8 * i ) ) ) >> ( 8 * i );
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}
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}
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void Frame::putString( int offset, char* value, int maxLen ) {
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maxLen = maxLen < 0 ? strlen( value ) : 0;
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maxLen = (unsigned int)maxLen > strlen( value ) ? strlen( value ) : 0;
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strncpy( &bytes[offset], value, maxLen );
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//bytes[offset+maxLen] = 0;
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}
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void Frame::putChar( int offset, char value ) {
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bytes[offset] = value;
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}
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bool XORFrame::getXOR() {
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char x = 0;
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for( int i = 0; i < 128; i++ ) x ^= bytes[i];
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if( x == 0 ) return true;
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return false;
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}
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void XORFrame::setXOR() {
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char x = 0;
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for( int i = 0; i < 127; i++ ) x ^= bytes[i];
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bytes[127] = x;
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}
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bool IdentificationFrame::isValid() {
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if( strcmp( id(), "MC" ) == 0 ) {
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return true;
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} else {
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return false;
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}
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}
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RGB SaveHeaderFrame::paletteColor( int index ) {
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index = index < 0 || index >= 16 ? 0 : index;
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char triplet[2] = { bytes[0x60 + ( index * 2 )], bytes[0x60 + ( index * 2 + 1 )] };
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RGB color;
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color.r = ( triplet[0] & 31 ) << 3;
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color.g = ( ( triplet[0] & 224 ) >> 2 ) + ( ( triplet[1] & 3 ) << 6 );
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color.b = ( triplet[1] & 124 ) << 1;
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return color;
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}
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int IconFrame::colorAt( int x, int y ) {
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int offset = x / 2;
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if( x % 2 == 0 ) {
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return bytes[(y*8)+offset] & 15;
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} else {
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return ( bytes[(y*8)+offset] & 240 ) >> 4;
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}
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}
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