KernelLand/Kernel/drvutil.c

   1 /*
   2  * Acess2 Kernel
   3  * - By John Hodge
   4  *
   5  * drvutil.c
   6  * - Common Driver/Filesystem Helper Functions
   7  */
   8 #define DEBUG   0
   9 #include <acess.h>
  10 #include <api_drv_disk.h>
  11 #include <api_drv_video.h>
  12
  13 // === TYPES ===
  14
  15 // === PROTOTYPES ===
  16 //int   DrvUtil_Video_2DStream(void *Ent, void *Buffer, int Length, tDrvUtil_Video_2DHandlers *Handlers, int SizeofHandlers);
  17 //size_t        DrvUtil_Video_WriteLFB(int Mode, tDrvUtil_Video_BufInfo *FBInfo, size_t Offset, size_t Length, void *Src);
  18 //void  DrvUtil_Video_SetCursor(tDrvUtil_Video_BufInfo *Buf, tVideo_IOCtl_Bitmap *Bitmap);
  19 //void  DrvUtil_Video_DrawCursor(tDrvUtil_Video_BufInfo *Buf, int X, int Y);
  20 void    DrvUtil_Video_RenderCursor(tDrvUtil_Video_BufInfo *Buf);
  21 //void  DrvUtil_Video_RemoveCursor(tDrvUtil_Video_BufInfo *Buf);
  22 void    DrvUtil_Video_2D_Fill(void *Ent, Uint16 X, Uint16 Y, Uint16 W, Uint16 H, Uint32 Colour);
  23 void    DrvUtil_Video_2D_Blit(void *Ent, Uint16 DstX, Uint16 DstY, Uint16 SrcX, Uint16 SrcY, Uint16 W, Uint16 H);
  24
  25 // === GLOBALS ===
  26 tDrvUtil_Video_2DHandlers       gDrvUtil_Stub_2DFunctions = {
  27         NULL,
  28         DrvUtil_Video_2D_Fill,
  29         DrvUtil_Video_2D_Blit
  30 };
  31 tVideo_IOCtl_Bitmap     gDrvUtil_TextModeCursor = {
  32         8, 16,
  33         0, 0,
  34         {
  35                 0, 0, 0         , 0, 0, 0, 0, 0,
  36                 0,-1, 0xFF000000, 0, 0, 0, 0, 0,
  37                 0,-1, 0xFF000000, 0, 0, 0, 0, 0,
  38                 0,-1, 0xFF000000, 0, 0, 0, 0, 0,
  39                 0,-1, 0xFF000000, 0, 0, 0, 0, 0,
  40                 0,-1, 0xFF000000, 0, 0, 0, 0, 0,
  41                 0,-1, 0xFF000000, 0, 0, 0, 0, 0,
  42                 0,-1, 0xFF000000, 0, 0, 0, 0, 0,
  43                 0,-1, 0xFF000000, 0, 0, 0, 0, 0,
  44                 0,-1, 0xFF000000, 0, 0, 0, 0, 0,
  45                 0,-1, 0xFF000000, 0, 0, 0, 0, 0,
  46                 0,-1, 0xFF000000, 0, 0, 0, 0, 0,
  47                 0,-1, 0xFF000000, 0, 0, 0, 0, 0,
  48                 0,-1, 0xFF000000, 0, 0, 0, 0, 0,
  49                 0, 0, 0         , 0, 0, 0, 0, 0,
  50                 0, 0, 0         , 0, 0, 0, 0, 0
  51         }
  52 };
  53
  54 // === CODE ===
  55 // --- Video Driver Helpers ---
  56 int DrvUtil_Video_2DStream(void *Ent, const void *Buffer, int Length,
  57         tDrvUtil_Video_2DHandlers *Handlers, int SizeofHandlers)
  58 {
  59         const Uint8     *stream = Buffer;
  60          int    rem = Length;
  61          int    op;
  62         while( rem )
  63         {
  64                 rem --;
  65                 op = *stream;
  66                 stream ++;
  67
  68                 if(op > NUM_VIDEO_2DOPS) {
  69                         Log_Warning("DrvUtil",
  70                                 "DrvUtil_Video_2DStream: Unknown operation %i",
  71                                 op);
  72                         return Length-rem;
  73                 }
  74
  75                 if(op*sizeof(void*) > SizeofHandlers) {
  76                         Log_Warning("DrvUtil",
  77                                 "DrvUtil_Video_2DStream: Driver does not support op %i",
  78                                 op);
  79                         return Length-rem;
  80                 }
  81
  82                 switch(op)
  83                 {
  84                 case VIDEO_2DOP_NOP:    break;
  85
  86                 case VIDEO_2DOP_FILL:
  87                         if(rem < 10)    return Length-rem;
  88
  89                         if(!Handlers->Fill) {
  90                                 Log_Warning("DrvUtil", "DrvUtil_Video_2DStream: Driver"
  91                                         " does not support VIDEO_2DOP_FILL");
  92                                 return Length-rem;
  93                         }
  94
  95                         Handlers->Fill(
  96                                 Ent,
  97                                 ((const Uint16*)stream)[0], ((const Uint16*)stream)[1],
  98                                 ((const Uint16*)stream)[2], ((const Uint16*)stream)[3],
  99                                 ((const Uint32*)stream)[4]
 100                                 );
 101
 102                         rem -= 10;
 103                         stream += 10;
 104                         break;
 105
 106                 case VIDEO_2DOP_BLIT:
 107                         if(rem < 12)    return Length-rem;
 108
 109                         if(!Handlers->Blit) {
 110                                 Log_Warning("DrvUtil", "DrvUtil_Video_2DStream: Driver"
 111                                         " does not support VIDEO_2DOP_BLIT");
 112                                 return Length-rem;
 113                         }
 114
 115                         Handlers->Blit(
 116                                 Ent,
 117                                 ((const Uint16*)stream)[0], ((const Uint16*)stream)[1],
 118                                 ((const Uint16*)stream)[2], ((const Uint16*)stream)[3],
 119                                 ((const Uint16*)stream)[4], ((const Uint16*)stream)[5]
 120                                 );
 121
 122                         rem -= 12;
 123                         stream += 12;
 124                         break;
 125
 126                 }
 127         }
 128         return 0;
 129 }
 130
 131 int DrvUtil_Video_WriteLFB(tDrvUtil_Video_BufInfo *FBInfo, size_t Offset, size_t Length, const void *Buffer)
 132 {
 133         Uint8   *dest;
 134         const Uint32    *src = Buffer;
 135          int    csr_x, csr_y;
 136          int    x, y;
 137          int    bytes_per_px = (FBInfo->Depth + 7) / 8;
 138         ENTER("pFBInfo xOffset xLength pBuffer",
 139                 Mode, FBInfo, Offset, Length, Buffer);
 140
 141         csr_x = FBInfo->CursorX;
 142         csr_y = FBInfo->CursorY;
 143
 144         DrvUtil_Video_RemoveCursor(FBInfo);
 145
 146         switch( FBInfo->BufferFormat )
 147         {
 148         case VIDEO_BUFFMT_TEXT:
 149                 {
 150                 const tVT_Char  *chars = Buffer;
 151                  int    widthInChars = FBInfo->Width/giVT_CharWidth;
 152                  int    heightInChars = FBInfo->Height/giVT_CharHeight;
 153                  int    i;
 154
 155                 LOG("bytes_per_px = %i", bytes_per_px);
 156                 LOG("widthInChars = %i, heightInChars = %i", widthInChars, heightInChars);
 157
 158                 Length /= sizeof(tVT_Char);     Offset /= sizeof(tVT_Char);
 159
 160                 x = Offset % widthInChars;      y = Offset / widthInChars;
 161                 LOG("x = %i, y = %i", x, y);
 162
 163                 // Sanity Check
 164                 if(Offset > heightInChars * widthInChars)       LEAVE_RET('i', 0);
 165                 if(y >= heightInChars)  LEAVE_RET('i', 0);
 166
 167                 if( Offset + Length > heightInChars*widthInChars )
 168                 {
 169                         Length = heightInChars*widthInChars - Offset;
 170                 }
 171
 172                 dest = FBInfo->Framebuffer;
 173                 LOG("dest = %p", dest);
 174                 dest += y * giVT_CharHeight * FBInfo->Pitch;
 175                 LOG("dest = %p", dest);
 176
 177                 for( i = 0; i < Length; i++ )
 178                 {
 179                         if( y >= heightInChars )
 180                         {
 181                                 Log_Notice("DrvUtil", "Stopped at %i", i);
 182                                 break;
 183                         }
 184
 185                         VT_Font_Render(
 186                                 chars->Ch,
 187                                 dest + x*giVT_CharWidth*bytes_per_px, FBInfo->Depth, FBInfo->Pitch,
 188                                 VT_Colour12toN(chars->BGCol, FBInfo->Depth),
 189                                 VT_Colour12toN(chars->FGCol, FBInfo->Depth)
 190                                 );
 191
 192                         chars ++;
 193                         x ++;
 194                         if( x >= widthInChars )
 195                         {
 196                                 x = 0;
 197                                 y ++;
 198                                 dest += FBInfo->Pitch*giVT_CharHeight;
 199                                 LOG("dest = %p", dest);
 200                         }
 201                 }
 202                 Length = i * sizeof(tVT_Char);
 203                 }
 204                 break;
 205
 206         case VIDEO_BUFFMT_FRAMEBUFFER:
 207                 if(FBInfo->Width*FBInfo->Height*4 < Offset+Length)
 208                 {
 209                         Log_Warning("DrvUtil", "DrvUtil_Video_WriteLFB - Framebuffer Overflow");
 210                         return 0;
 211                 }
 212
 213                 switch(FBInfo->Depth)
 214                 {
 215                 case 15:
 216                 case 16:
 217                         Log_Warning("DrvUtil", "TODO: Support 15/16 bpp modes in LFB write");
 218                         break;
 219                 case 24:
 220                         x = Offset % FBInfo->Width;
 221                         y = Offset / FBInfo->Width;
 222                         dest = (Uint8*)FBInfo->Framebuffer + y*FBInfo->Pitch;
 223                         for( ; Length >= 4; Length -= 4 )
 224                         {
 225                                 dest[x*3+0] = *src & 0xFF;
 226                                 dest[x*3+1] = (*src >> 8) & 0xFF;
 227                                 dest[x*3+2] = (*src >> 16) & 0xFF;
 228                                 x ++;
 229                                 if(x == FBInfo->Width) {
 230                                         dest += FBInfo->Pitch;
 231                                         x = 0;
 232                                 }
 233                         }
 234                         break;
 235                 case 32:
 236                         // Copy to Frambuffer
 237                         if( FBInfo->Pitch != FBInfo->Width*4 )
 238                         {
 239                                 Uint32  *px;
 240                                 // Pitch isn't 4*Width
 241                                 x = Offset % FBInfo->Width;
 242                                 y = Offset / FBInfo->Height;
 243
 244                                 px = (Uint32*)FBInfo->Framebuffer + y*FBInfo->Pitch/4;
 245
 246                                 for( ; Length >= 4; Length -= 4, x )
 247                                 {
 248                                         px[x++] = *src ++;
 249                                         if( x == FBInfo->Width ) {
 250                                                 x = 0;
 251                                                 px += FBInfo->Pitch;
 252                                         }
 253                                 }
 254                         }
 255                         else
 256                         {
 257                                 dest = (Uint8 *)FBInfo->Framebuffer + Offset;
 258                                 memcpy(dest, Buffer, Length);
 259                         }
 260                         break;
 261                 default:
 262                         Log_Warning("DrvUtil", "DrvUtil_Video_WriteLFB - Unknown bit depthn %i", FBInfo->Depth);
 263                         break;
 264                 }
 265                 break;
 266
 267         case VIDEO_BUFFMT_2DSTREAM:
 268                 Length = DrvUtil_Video_2DStream(
 269                         FBInfo, Buffer, Length,
 270                         &gDrvUtil_Stub_2DFunctions, sizeof(gDrvUtil_Stub_2DFunctions)
 271                         );
 272                 break;
 273
 274         default:
 275                 LEAVE('i', -1);
 276                 return -1;
 277         }
 278
 279         DrvUtil_Video_DrawCursor(FBInfo, csr_x, csr_y);
 280
 281         LEAVE('x', Length);
 282         return Length;
 283 }
 284
 285 int DrvUtil_Video_SetCursor(tDrvUtil_Video_BufInfo *Buf, tVideo_IOCtl_Bitmap *Bitmap)
 286 {
 287          int    csrX = Buf->CursorX, csrY = Buf->CursorY;
 288         size_t  size;
 289
 290         // Clear old bitmap
 291         if( Buf->CursorBitmap )
 292         {
 293                 DrvUtil_Video_RemoveCursor(Buf);
 294                 if( !Bitmap || Bitmap->W != Buf->CursorBitmap->W || Bitmap->H != Buf->CursorBitmap->H )
 295                 {
 296                         free( Buf->CursorSaveBuf );
 297                         Buf->CursorSaveBuf = NULL;
 298                 }
 299                 if( Buf->CursorBitmap != &gDrvUtil_TextModeCursor)
 300                         free(Buf->CursorBitmap);
 301                 Buf->CursorBitmap = NULL;
 302         }
 303
 304         // If the new bitmap is null, disable drawing
 305         if( !Bitmap )
 306         {
 307                 Buf->CursorX = -1;
 308                 Buf->CursorY = -1;
 309                 return 0;
 310         }
 311
 312         // Sanity check the bitmap
 313         if( !CheckMem(Bitmap, sizeof(*Bitmap)) || !CheckMem(Bitmap->Data, Bitmap->W*Bitmap->H*sizeof(Uint32)) )
 314         {
 315                 Log_Warning("DrvUtil", "DrvUtil_Video_SetCursor: Bitmap (%p) is in invalid memory", Bitmap);
 316                 errno = -EINVAL;
 317                 return -1;
 318         }
 319
 320         // Don't take a copy of the DrvUtil provided cursor
 321         if( Bitmap == &gDrvUtil_TextModeCursor )
 322         {
 323                 Buf->CursorBitmap = Bitmap;
 324         }
 325         else
 326         {
 327                 size = sizeof(tVideo_IOCtl_Bitmap) + Bitmap->W*Bitmap->H*4;
 328
 329                 // Take a copy
 330                 Buf->CursorBitmap = malloc( size );
 331                 memcpy(Buf->CursorBitmap, Bitmap, size);
 332         }
 333
 334         // Restore cursor position
 335         DrvUtil_Video_DrawCursor(Buf, csrX, csrY);
 336         return 0;
 337 }
 338
 339 void DrvUtil_Video_DrawCursor(tDrvUtil_Video_BufInfo *Buf, int X, int Y)
 340 {
 341          int    render_ox=0, render_oy=0, render_w, render_h;
 342
 343         DrvUtil_Video_RemoveCursor(Buf);
 344
 345         // X < 0 disables the cursor
 346         if( X < 0 ) {
 347                 Buf->CursorX = -1;
 348                 return ;
 349         }
 350
 351         // Sanity checking
 352         if( X < 0 || Y < 0 )    return;
 353         if( X >= Buf->Width || Y >= Buf->Height )       return;
 354
 355         // Ensure the cursor is enabled
 356         if( !Buf->CursorBitmap )        return ;
 357
 358         // Save cursor position (for changing the bitmap)
 359         Buf->CursorX = X;       Buf->CursorY = Y;
 360
 361         // Apply cursor's center offset
 362         X -= Buf->CursorBitmap->XOfs;
 363         Y -= Buf->CursorBitmap->YOfs;
 364
 365         // Get the width of the cursor on screen (clipping to right/bottom edges)
 366         render_w = X > Buf->Width  - Buf->CursorBitmap->W ? Buf->Width  - X : Buf->CursorBitmap->W;
 367         render_h = Y > Buf->Height - Buf->CursorBitmap->H ? Buf->Height - Y : Buf->CursorBitmap->H;
 368
 369         // Clipp to left/top edges
 370         if(X < 0) {     render_ox = -X; X = 0;  }
 371         if(Y < 0) {     render_oy = -Y; Y = 0;  }
 372
 373         // Save values
 374         Buf->CursorRenderW = render_w;  Buf->CursorRenderH = render_h;
 375         Buf->CursorDestX   = X;         Buf->CursorDestY = Y;
 376         Buf->CursorReadX   = render_ox; Buf->CursorReadY = render_oy;
 377
 378         // Call render routine
 379         DrvUtil_Video_RenderCursor(Buf);
 380 }
 381
 382 void DrvUtil_Video_RenderCursor(tDrvUtil_Video_BufInfo *Buf)
 383 {
 384          int    src_x = Buf->CursorReadX, src_y = Buf->CursorReadY;
 385          int    render_w = Buf->CursorRenderW, render_h = Buf->CursorRenderH;
 386          int    dest_x = Buf->CursorDestX, dest_y = Buf->CursorDestY;
 387          int    bytes_per_px = (Buf->Depth + 7) / 8;
 388          int    save_pitch = Buf->CursorBitmap->W * bytes_per_px;
 389         void    *dest;
 390         Uint32  *src;
 391          int    x, y;
 392
 393         dest = (Uint8*)Buf->Framebuffer + dest_y*Buf->Pitch + dest_x*bytes_per_px;
 394         src = Buf->CursorBitmap->Data + src_y * Buf->CursorBitmap->W + src_x;
 395
 396         // Allocate save buffer if not already
 397         if( !Buf->CursorSaveBuf )
 398                 Buf->CursorSaveBuf = malloc( Buf->CursorBitmap->W*Buf->CursorBitmap->H*bytes_per_px );
 399
 400         // Save behind the cursor
 401         for( y = 0; y < render_h; y ++ )
 402                 memcpy(
 403                         (Uint8*)Buf->CursorSaveBuf + y*save_pitch,
 404                         (Uint8*)dest + y*Buf->Pitch,
 405                         render_w*bytes_per_px
 406                         );
 407
 408         // Draw the cursor
 409         switch(Buf->Depth)
 410         {
 411         case 15:
 412         case 16:
 413                 Log_Warning("DrvUtil", "TODO: Support 15/16 bpp modes in cursor draw");
 414                 break;
 415         case 24:
 416                 for( y = 0; y < render_h; y ++ )
 417                 {
 418                         Uint8   *px;
 419                         px = dest;
 420                         for(x = 0; x < render_w; x ++, px += 3)
 421                         {
 422                                 Uint32  value = src[x];
 423                                 // TODO: Should I implement alpha blending?
 424                                 if(value & 0xFF000000)
 425                                 {
 426                                         px[0] = value & 0xFF;
 427                                         px[1] = (value >> 8) & 0xFF;
 428                                         px[2] = (value >> 16) & 0xFF;
 429                                 }
 430                                 else
 431                                         ;
 432                         }
 433                         src += Buf->CursorBitmap->W;
 434                         dest = (Uint8*)dest + Buf->Pitch;
 435                 }
 436                 break;
 437         case 32:
 438                 for( y = 0; y < render_h; y ++ )
 439                 {
 440                         Uint32  *px;
 441                         px = dest;
 442                         for(x = 0; x < render_w; x ++, px ++)
 443                         {
 444                                 Uint32  value = src[x];
 445                                 // TODO: Should I implement alpha blending?
 446                                 if(value & 0xFF000000)
 447                                         *px = value;
 448                                 else
 449                                         ;       // NOP, completely transparent
 450                         }
 451                         src += Buf->CursorBitmap->W;
 452                         dest = (Uint8*)dest + Buf->Pitch;
 453                 }
 454                 break;
 455         default:
 456                 Log_Error("DrvUtil", "RenderCursor - Unknown bit depth %i", Buf->Depth);
 457                 Buf->CursorX = -1;
 458                 break;
 459         }
 460 }
 461
 462 void DrvUtil_Video_RemoveCursor(tDrvUtil_Video_BufInfo *Buf)
 463 {
 464          int    bytes_per_px = (Buf->Depth + 7) / 8;
 465          int    y, save_pitch;
 466         Uint8   *dest, *src;
 467
 468         // Just a little sanity
 469         if( !Buf->CursorBitmap || Buf->CursorX == -1 )  return ;
 470         if( !Buf->CursorSaveBuf )       return ;
 471
 472 //      Debug("DrvUtil_Video_RemoveCursor: (Buf=%p) dest_x=%i, dest_y=%i", Buf, Buf->CursorDestX, Buf->CursorDestY);
 473
 474         // Set up
 475         save_pitch = Buf->CursorBitmap->W * bytes_per_px;
 476         dest = (Uint8*)Buf->Framebuffer + Buf->CursorDestY * Buf->Pitch + Buf->CursorDestX*bytes_per_px;
 477         src = Buf->CursorSaveBuf;
 478
 479         // Copy each line back
 480         for( y = 0; y < Buf->CursorRenderH; y ++ )
 481         {
 482                 memcpy( dest, src, Buf->CursorRenderW * bytes_per_px );
 483                 src += save_pitch;
 484                 dest += Buf->Pitch;
 485         }
 486
 487         // Set the cursor as removed
 488         Buf->CursorX = -1;
 489 }
 490
 491 void DrvUtil_Video_2D_Fill(void *Ent, Uint16 X, Uint16 Y, Uint16 W, Uint16 H, Uint32 Colour)
 492 {
 493         tDrvUtil_Video_BufInfo  *FBInfo = Ent;
 494
 495         // TODO: Handle non-32bit modes
 496         if( FBInfo->Depth != 32 )       return;
 497
 498         // TODO: Be less hacky
 499          int    pitch = FBInfo->Pitch/4;
 500         Uint32  *buf = (Uint32*)FBInfo->Framebuffer + Y*pitch + X;
 501         while( H -- ) {
 502                 Uint32 *tmp;
 503                  int    i;
 504                 tmp = buf;
 505                 for(i=W;i--;tmp++)      *tmp = Colour;
 506                 buf += pitch;
 507         }
 508 }
 509
 510 void DrvUtil_Video_2D_Blit(void *Ent, Uint16 DstX, Uint16 DstY, Uint16 SrcX, Uint16 SrcY, Uint16 W, Uint16 H)
 511 {
 512         tDrvUtil_Video_BufInfo  *FBInfo = Ent;
 513          int    scrnpitch = FBInfo->Pitch;
 514          int    bytes_per_px = (FBInfo->Depth + 7) / 8;
 515          int    dst = DstY*scrnpitch + DstX;
 516          int    src = SrcY*scrnpitch + SrcX;
 517          int    tmp;
 518
 519         //Log("Vesa_2D_Blit: (Ent=%p, DstX=%i, DstY=%i, SrcX=%i, SrcY=%i, W=%i, H=%i)",
 520         //      Ent, DstX, DstY, SrcX, SrcY, W, H);
 521
 522         if(SrcX + W > FBInfo->Width)    W = FBInfo->Width - SrcX;
 523         if(DstX + W > FBInfo->Width)    W = FBInfo->Width - DstX;
 524         if(SrcY + H > FBInfo->Height)   H = FBInfo->Height - SrcY;
 525         if(DstY + H > FBInfo->Height)   H = FBInfo->Height - DstY;
 526
 527         //Debug("W = %i, H = %i", W, H);
 528
 529         if( dst > src ) {
 530                 // Reverse copy
 531                 dst += H*scrnpitch;
 532                 src += H*scrnpitch;
 533                 while( H -- ) {
 534                         dst -= scrnpitch;
 535                         src -= scrnpitch;
 536                         tmp = W*bytes_per_px;
 537                         for( tmp = W; tmp --; ) {
 538                                 *((Uint8*)FBInfo->Framebuffer + dst + tmp) = *((Uint8*)FBInfo->Framebuffer + src + tmp);
 539                         }
 540                 }
 541         }
 542         else if(W == FBInfo->Width && FBInfo->Pitch == FBInfo->Width*bytes_per_px) {
 543                 memmove((Uint8*)FBInfo->Framebuffer + dst, (Uint8*)FBInfo->Framebuffer + src, H*FBInfo->Pitch);
 544         }
 545         else {
 546                 // Normal copy is OK
 547                 while( H -- ) {
 548                         memcpy((Uint8*)FBInfo->Framebuffer + dst, (Uint8*)FBInfo->Framebuffer + src, W*bytes_per_px);
 549                         dst += scrnpitch;
 550                         src += scrnpitch;
 551                 }
 552         }
 553         //Log("Vesa_2D_Blit: RETURN");
 554 }
 555
 556
 557 // --- Disk Driver Helpers ---
 558 Uint64 DrvUtil_ReadBlock(Uint64 Start, Uint64 Length, void *Buffer,
 559         tDrvUtil_Read_Callback ReadBlocks, Uint64 BlockSize, Uint Argument)
 560 {
 561         Uint8   tmp[BlockSize]; // C99
 562         Uint64  block = Start / BlockSize;
 563          int    offset = Start - block * BlockSize;
 564          int    leading = BlockSize - offset;
 565         Uint64  num;
 566          int    tailings;
 567         Uint64  ret;
 568
 569         ENTER("XStart XLength pBuffer pReadBlocks XBlockSize xArgument",
 570                 Start, Length, Buffer, ReadBlocks, BlockSize, Argument);
 571
 572         // Non aligned start, let's fix that!
 573         if(offset != 0)
 574         {
 575                 if(leading > Length)    leading = Length;
 576                 LOG("Reading %i bytes from Block1+%i", leading, offset);
 577                 ret = ReadBlocks(block, 1, tmp, Argument);
 578                 if(ret != 1) {
 579                         LEAVE('i', 0);
 580                         return 0;
 581                 }
 582                 memcpy( Buffer, &tmp[offset], leading );
 583
 584                 if(leading == Length) {
 585                         LEAVE('i', leading);
 586                         return leading;
 587                 }
 588
 589                 Buffer = (Uint8*)Buffer + leading;
 590                 block ++;
 591                 num = ( Length - leading ) / BlockSize;
 592                 tailings = Length - num * BlockSize - leading;
 593         }
 594         else {
 595                 num = Length / BlockSize;
 596                 tailings = Length % BlockSize;
 597         }
 598
 599         // Read central blocks
 600         if(num)
 601         {
 602                 LOG("Reading %i blocks", num);
 603                 ret = ReadBlocks(block, num, Buffer, Argument);
 604                 if(ret != num ) {
 605                         LEAVE('X', leading + ret * BlockSize);
 606                         return leading + ret * BlockSize;
 607                 }
 608         }
 609
 610         // Read last tailing block
 611         if(tailings != 0)
 612         {
 613                 LOG("Reading %i bytes from last block", tailings);
 614                 block += num;
 615                 Buffer = (Uint8*)Buffer + num * BlockSize;
 616                 ret = ReadBlocks(block, 1, tmp, Argument);
 617                 if(ret != 1) {
 618                         LEAVE('X', leading + num * BlockSize);
 619                         return leading + num * BlockSize;
 620                 }
 621                 memcpy( Buffer, tmp, tailings );
 622         }
 623
 624         LEAVE('X', Length);
 625         return Length;
 626 }
 627
 628 Uint64 DrvUtil_WriteBlock(Uint64 Start, Uint64 Length, const void *Buffer,
 629         tDrvUtil_Read_Callback ReadBlocks, tDrvUtil_Write_Callback WriteBlocks,
 630         Uint64 BlockSize, Uint Argument)
 631 {
 632         Uint8   tmp[BlockSize]; // C99
 633         Uint64  block = Start / BlockSize;
 634          int    offset = Start - block * BlockSize;
 635          int    leading = BlockSize - offset;
 636         Uint64  num;
 637          int    tailings;
 638         Uint64  ret;
 639
 640         ENTER("XStart XLength pBuffer pReadBlocks pWriteBlocks XBlockSize xArgument",
 641                 Start, Length, Buffer, ReadBlocks, WriteBlocks, BlockSize, Argument);
 642
 643         // Non aligned start, let's fix that!
 644         if(offset != 0)
 645         {
 646                 if(leading > Length)    leading = Length;
 647                 LOG("Writing %i bytes to Block1+%i", leading, offset);
 648                 // Read a copy of the block
 649                 ret = ReadBlocks(block, 1, tmp, Argument);
 650                 if(ret != 1) {
 651                         LEAVE('i', 0);
 652                         return 0;
 653                 }
 654                 // Modify
 655                 memcpy( &tmp[offset], Buffer, leading );
 656                 // Write Back
 657                 ret = WriteBlocks(block, 1, tmp, Argument);
 658                 if(ret != 1) {
 659                         LEAVE('i', 0);
 660                         return 0;
 661                 }
 662
 663                 if(leading == Length) {
 664                         LEAVE('i', leading);
 665                         return leading;
 666                 }
 667
 668                 Buffer = (Uint8*)Buffer + leading;
 669                 block ++;
 670                 num = ( Length - leading ) / BlockSize;
 671                 tailings = Length - num * BlockSize - leading;
 672         }
 673         else {
 674                 num = Length / BlockSize;
 675                 tailings = Length % BlockSize;
 676         }
 677
 678         // Read central blocks
 679         if(num)
 680         {
 681                 LOG("Writing %i blocks", num);
 682                 ret = WriteBlocks(block, num, Buffer, Argument);
 683                 if(ret != num ) {
 684                         LEAVE('X', leading + ret * BlockSize);
 685                         return leading + ret * BlockSize;
 686                 }
 687         }
 688
 689         // Read last tailing block
 690         if(tailings != 0)
 691         {
 692                 LOG("Writing %i bytes to last block", tailings);
 693                 block += num;
 694                 Buffer = (Uint8*)Buffer + num * BlockSize;
 695                 // Read
 696                 ret = ReadBlocks(block, 1, tmp, Argument);
 697                 if(ret != 1) {
 698                         LEAVE('X', leading + num * BlockSize);
 699                         return leading + num * BlockSize;
 700                 }
 701                 // Modify
 702                 memcpy( tmp, Buffer, tailings );
 703                 // Write
 704                 ret = WriteBlocks(block, 1, tmp, Argument);
 705                 if(ret != 1) {
 706                         LEAVE('X', leading + num * BlockSize);
 707                         return leading + num * BlockSize;
 708                 }
 709
 710         }
 711
 712         LEAVE('X', Length);
 713         return Length;
 714 }