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#include "main.h"
#include "cvt.h"
bool is_cmf(const BYTE* buf,size_t s)
{
return s>0x20 && *(DWORD*)buf == _rv('CTMF');
}
static BYTE tempodat[7]={0,0xFF,0x51,0x03,0,0,0};
bool load_cmf(MIDI_file * mf,const BYTE* ptr,size_t sz)
{
if (sz < 14)
return 0;
WORD music_offset = *(WORD*)(ptr+8);
if ((size_t)music_offset > sz)
return 0;
const BYTE* _t=ptr+music_offset;
size_t total_size=sz - music_offset;
mf->size=14+8+7+total_size;
BYTE* _pt=(BYTE*)malloc(mf->size);
if (!_pt) return 0;
mf->data=_pt;
*(DWORD*)_pt=_rv('MThd');
_pt+=4;
*(DWORD*)_pt=_rv(6);
_pt+=4;
*(WORD*)_pt=0;
_pt+=2;
*(WORD*)_pt=0x0100;
_pt+=2;
*(WORD*)_pt=rev16(*(WORD*)(ptr+10));
_pt+=2;
*(DWORD*)_pt=_rv('MTrk');
_pt+=4;
*(DWORD*)_pt=rev32(total_size+7);
_pt+=4;
DWORD tm=(DWORD)(48000000/(*(WORD*)(ptr+12)));
tempodat[4]=(BYTE)((tm>>16)&0xFF);
tempodat[5]=(BYTE)((tm>>8)&0xFF);
tempodat[6]=(BYTE)(tm&0xFF);
memcpy(_pt,tempodat,7);
_pt+=7;
memcpy(_pt,_t,total_size);
return 1;
}
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