1 files changed, 113 insertions, 0 deletions

diff --git a/src/hd24syx2bin.cpp b/src/hd24syx2bin.cpp
new file mode 100644
index 0000000..1ccc501
--- /dev/null
+++ b/src/hd24syx2bin.cpp
@@ -0,0 +1,113 @@
+//syx2bin.cpp
+//converts an alesis hd24 .syx OS file to binary
+using namespace std;
+#include <iostream>
+#define SKIPCHARS 9
+
+int main(int argc, char *argv[])
+{
+
+  FILE *pInfile;
+  FILE *pOutfile;
+  char *pInfilename, *pOutfilename;
+  int loop;
+  int msbits;
+
+  if(argc < 3)
+  {
+         fprintf(stderr, "Usage : %s infile outfile\n",argv[0]);
+         exit(1);
+  }
+
+  pInfilename = argv[1];
+  pOutfilename = argv[2];
+
+  pInfile = fopen(pInfilename, "rb");
+  if(!pInfile)
+  {
+         fprintf(stderr, "ERROR : couldn't open %s for reading\n", pInfilename);
+         exit(1);
+  }
+  pOutfile = fopen(pOutfilename, "wb");
+  if(!pOutfile)
+  {
+         fprintf(stderr, "ERROR : couldn't open %s for writing\n", pOutfilename);
+         fclose(pInfile); //close open infile
+         exit(1);
+  }
+
+  //skip F0 and 5 byte header
+  for(loop = 0; loop < SKIPCHARS; loop++)
+  {
+         fgetc(pInfile);
+  }
+
+//  msbits = fgetc(pInfile);
+  unsigned char b[8];
+  unsigned char header[64]; 
+  int whichbyte=3;
+int headerbyte=0;
+  unsigned int checksum=0;
+  int filesize=0;
+  int written=0;
+  while((msbits != EOF) && (msbits != 0xF7)) //get most significant bits byte
+  {
+        int i;
+        int j;
+        j=10;
+          
+        for (i=0;i<8;i++) {
+                b[i]=fgetc(pInfile);
+                if (b[i]==0xF7) {
+                        msbits=0xF7;
+                        j=i;
+                }
+        }
+        // convert 8->7 bytes
+        unsigned char bits=b[0];
+        int max=8;
+        if (j<max) { max=j; }
+        for (i=1;i<max;i++) {
+#ifdef LSB
+                int onebit=(bits & 1) <<7;
+                b[i]|=onebit;
+                bits = (bits>>1);
+#else
+                int onebit=(bits << 1) & 0x80;
+                b[i]|=onebit;
+                bits = (bits << 1);
+#endif
+                fputc((unsigned char) b[i], pOutfile);
+                written++;
+                if (headerbyte<64) {
+                        header[headerbyte]=b[i];
+                        headerbyte++;
+                }
+                else 
+                {
+                        if (filesize==0) {
+                                int x1=(int)((unsigned char)header[47]);
+                                int x2=(int)((unsigned char)header[46]);
+                                int x3=(int)((unsigned char)header[45]);
+                                int x4=(int)((unsigned char)header[44]);
+                        filesize=x1+(256*x2)+(256*256*x3)+(256*256*256*x4);
+                        }
+                }
+                whichbyte=(whichbyte+1)%4;  
+                checksum=(checksum+b[i] ) % 256;
+//((unsigned char)(b[i]) << (8*(whichbyte))) ;
+                if (filesize!=0) {
+                        if (written>=filesize) break;
+                }
+        }
+        if (filesize!=0) {
+                if (written>=filesize) break;
+        }
+
+  }
+  printf("Checksum=%x\n",checksum);
+  fclose(pInfile);
+  fclose(pOutfile);
+  return 0;
+}
+