programs/regedit/hexedit.c

   1 /*
   2  * Hex Edit control
   3  *
   4  * Copyright 2005 Robert Shearman
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * TODO:
  21  * - Selection support
  22  * - Cut, copy and paste
  23  * - Mouse support
  24  */
  25
  26 #include <stdarg.h>
  27 #include <string.h>
  28 #include <assert.h>
  29
  30 #include "windef.h"
  31 #include "winbase.h"
  32 #include "wingdi.h"
  33 #include "winuser.h"
  34 #include "winnls.h"
  35 #include "commctrl.h"
  36
  37 #include "wine/heap.h"
  38 #include "main.h"
  39
  40 /* spaces dividing hex and ASCII */
  41 #define DIV_SPACES 4
  42
  43 typedef struct tagHEXEDIT_INFO
  44 {
  45     HWND  hwndSelf;
  46     HFONT hFont;
  47     BOOL  bFocus : 1;
  48     BOOL  bFocusHex : 1; /* TRUE if focus is on hex, FALSE if focus on ASCII */
  49     BOOL  bInsert : 1; /* insert mode if TRUE, overwrite mode if FALSE */
  50     INT   nHeight; /* height of text */
  51     INT   nCaretPos; /* caret pos in nibbles */
  52     BYTE *pData;
  53     INT   cbData;
  54     INT   nBytesPerLine; /* bytes of hex to display per line of the control */
  55     INT   nScrollPos; /* first visible line */
  56 } HEXEDIT_INFO;
  57
  58 const WCHAR szHexEditClass[] = {'H','e','x','E','d','i','t',0};
  59
  60 static inline LRESULT HexEdit_SetFont (HEXEDIT_INFO *infoPtr, HFONT hFont, BOOL redraw);
  61
  62 static inline BYTE hexchar_to_byte(WCHAR ch)
  63 {
  64     if (ch >= '0' && ch <= '9')
  65         return ch - '0';
  66     else if (ch >= 'a' && ch <= 'f')
  67         return ch - 'a' + 10;
  68     else if (ch >= 'A' && ch <= 'F')
  69         return ch - 'A' + 10;
  70     else
  71         return -1;
  72 }
  73
  74 static LPWSTR HexEdit_GetLineText(int offset, BYTE *pData, LONG cbData, LONG pad)
  75 {
  76     static const WCHAR percent_04xW[] = {'%','0','4','X',' ',' ',0};
  77     static const WCHAR percent_02xW[] = {'%','0','2','X',' ',0};
  78
  79     WCHAR *lpszLine = heap_xalloc((6 + cbData * 3 + pad * 3 + DIV_SPACES + cbData + 1) * sizeof(WCHAR));
  80     LONG i;
  81
  82     wsprintfW(lpszLine, percent_04xW, offset);
  83
  84     for (i = 0; i < cbData; i++)
  85         wsprintfW(lpszLine + 6 + i*3, percent_02xW, pData[offset + i]);
  86     for (i = 0; i < pad * 3; i++)
  87         lpszLine[6 + cbData * 3 + i] = ' ';
  88
  89     for (i = 0; i < DIV_SPACES; i++)
  90         lpszLine[6 + cbData * 3 + pad * 3 + i] = ' ';
  91
  92     /* attempt an ASCII representation if the characters are printable,
  93      * otherwise display a '.' */
  94     for (i = 0; i < cbData; i++)
  95     {
  96         /* (C1_ALPHA|C1_BLANK|C1_PUNCT|C1_DIGIT|C1_LOWER|C1_UPPER) */
  97         if (iswprint(pData[offset + i]))
  98             lpszLine[6 + cbData * 3 + pad * 3 + DIV_SPACES + i] = pData[offset + i];
  99         else
 100             lpszLine[6 + cbData * 3 + pad * 3 + DIV_SPACES + i] = '.';
 101     }
 102     lpszLine[6 + cbData * 3 + pad * 3 + DIV_SPACES + cbData] = 0;
 103     return lpszLine;
 104 }
 105
 106 static void
 107 HexEdit_Paint(HEXEDIT_INFO *infoPtr)
 108 {
 109     PAINTSTRUCT ps;
 110     HDC hdc = BeginPaint(infoPtr->hwndSelf, &ps);
 111     INT nXStart, nYStart;
 112     COLORREF clrOldText;
 113     HFONT hOldFont;
 114     INT iMode;
 115     LONG lByteOffset = infoPtr->nScrollPos * infoPtr->nBytesPerLine;
 116     int i;
 117
 118     /* Make a gap from the frame */
 119     nXStart = GetSystemMetrics(SM_CXBORDER);
 120     nYStart = GetSystemMetrics(SM_CYBORDER);
 121
 122     if (GetWindowLongW(infoPtr->hwndSelf, GWL_STYLE) & WS_DISABLED)
 123         clrOldText = SetTextColor(hdc, GetSysColor(COLOR_GRAYTEXT));
 124     else
 125         clrOldText = SetTextColor(hdc, GetSysColor(COLOR_WINDOWTEXT));
 126
 127     iMode = SetBkMode(hdc, TRANSPARENT);
 128     hOldFont = SelectObject(hdc, infoPtr->hFont);
 129
 130     for (i = lByteOffset; i < infoPtr->cbData; i += infoPtr->nBytesPerLine)
 131     {
 132         LPWSTR lpszLine;
 133         LONG nLineLen = min(infoPtr->cbData - i, infoPtr->nBytesPerLine);
 134
 135         lpszLine = HexEdit_GetLineText(i, infoPtr->pData, nLineLen, infoPtr->nBytesPerLine - nLineLen);
 136
 137         /* FIXME: draw hex <-> ASCII mapping highlighted? */
 138         TextOutW(hdc, nXStart, nYStart, lpszLine, lstrlenW(lpszLine));
 139
 140         nYStart += infoPtr->nHeight;
 141         heap_free(lpszLine);
 142     }
 143
 144     SelectObject(hdc, hOldFont);
 145     SetBkMode(hdc, iMode);
 146     SetTextColor(hdc, clrOldText);
 147
 148     EndPaint(infoPtr->hwndSelf, &ps);
 149 }
 150
 151 static void
 152 HexEdit_UpdateCaret(HEXEDIT_INFO *infoPtr)
 153 {
 154     HDC hdc;
 155     HFONT hOldFont;
 156     SIZE size;
 157     INT nCaretBytePos = infoPtr->nCaretPos/2;
 158     INT nByteLinePos = nCaretBytePos % infoPtr->nBytesPerLine;
 159     INT nLine = nCaretBytePos / infoPtr->nBytesPerLine;
 160     LONG nLineLen = min(infoPtr->cbData - nLine * infoPtr->nBytesPerLine, infoPtr->nBytesPerLine);
 161     LPWSTR lpszLine = HexEdit_GetLineText(nLine * infoPtr->nBytesPerLine, infoPtr->pData, nLineLen, infoPtr->nBytesPerLine - nLineLen);
 162     INT nCharOffset;
 163
 164     /* calculate offset of character caret is on in the line */
 165     if (infoPtr->bFocusHex)
 166         nCharOffset = 6 + nByteLinePos*3 + infoPtr->nCaretPos % 2;
 167     else
 168         nCharOffset = 6 + infoPtr->nBytesPerLine*3 + DIV_SPACES + nByteLinePos;
 169
 170     hdc = GetDC(infoPtr->hwndSelf);
 171     hOldFont = SelectObject(hdc, infoPtr->hFont);
 172
 173     GetTextExtentPoint32W(hdc, lpszLine, nCharOffset, &size);
 174
 175     SelectObject(hdc, hOldFont);
 176     ReleaseDC(infoPtr->hwndSelf, hdc);
 177
 178     if (!nLineLen) size.cx = 0;
 179
 180     heap_free(lpszLine);
 181
 182     SetCaretPos(
 183         GetSystemMetrics(SM_CXBORDER) + size.cx,
 184         GetSystemMetrics(SM_CYBORDER) + (nLine - infoPtr->nScrollPos) * infoPtr->nHeight);
 185 }
 186
 187 static void
 188 HexEdit_UpdateScrollbars(HEXEDIT_INFO *infoPtr)
 189 {
 190     RECT rcClient;
 191     INT nLines = infoPtr->cbData / infoPtr->nBytesPerLine;
 192     INT nVisibleLines;
 193     SCROLLINFO si;
 194
 195     GetClientRect(infoPtr->hwndSelf, &rcClient);
 196     InflateRect(&rcClient, -GetSystemMetrics(SM_CXBORDER), -GetSystemMetrics(SM_CYBORDER));
 197
 198     nVisibleLines = (rcClient.bottom - rcClient.top) / infoPtr->nHeight;
 199     si.cbSize = sizeof(si);
 200     si.fMask = SIF_RANGE | SIF_PAGE;
 201     si.nMin = 0;
 202     si.nMax = max(nLines - nVisibleLines, nLines);
 203     si.nPage = nVisibleLines;
 204     SetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si, TRUE);
 205 }
 206
 207 static void
 208 HexEdit_EnsureVisible(HEXEDIT_INFO *infoPtr, INT nCaretPos)
 209 {
 210     INT nLine = nCaretPos / (2 * infoPtr->nBytesPerLine);
 211     SCROLLINFO si;
 212
 213     si.cbSize = sizeof(si);
 214     si.fMask  = SIF_POS | SIF_PAGE;
 215     GetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si);
 216     if (nLine < si.nPos)
 217         si.nPos = nLine;
 218     else if (nLine >= si.nPos + si.nPage)
 219         si.nPos = nLine - si.nPage + 1;
 220     else
 221         return;
 222     si.fMask = SIF_POS;
 223
 224     SetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si, FALSE);
 225     SendMessageW(infoPtr->hwndSelf, WM_VSCROLL, MAKELONG(SB_THUMBPOSITION, 0), 0);
 226 }
 227
 228
 229 static LRESULT
 230 HexEdit_SetData(HEXEDIT_INFO *infoPtr, INT cbData, const BYTE *pData)
 231 {
 232     heap_free(infoPtr->pData);
 233     infoPtr->cbData = 0;
 234
 235     infoPtr->pData = heap_xalloc(cbData);
 236     memcpy(infoPtr->pData, pData, cbData);
 237     infoPtr->cbData = cbData;
 238
 239     infoPtr->nCaretPos = 0;
 240     HexEdit_UpdateScrollbars(infoPtr);
 241     HexEdit_UpdateCaret(infoPtr);
 242     InvalidateRect(infoPtr->hwndSelf, NULL, TRUE);
 243     return TRUE;
 244 }
 245
 246 static LRESULT
 247 HexEdit_GetData(HEXEDIT_INFO *infoPtr, INT cbData, BYTE *pData)
 248 {
 249     if (pData)
 250         memcpy(pData, infoPtr->pData, min(cbData, infoPtr->cbData));
 251     return infoPtr->cbData;
 252 }
 253
 254 static inline LRESULT
 255 HexEdit_Char (HEXEDIT_INFO *infoPtr, WCHAR ch)
 256 {
 257     INT nCaretBytePos = infoPtr->nCaretPos/2;
 258
 259     assert(nCaretBytePos >= 0);
 260
 261     /* backspace is special */
 262     if (ch == '\b')
 263     {
 264         if (infoPtr->nCaretPos == 0)
 265             return 0;
 266
 267         /* if at end of byte then delete the whole byte */
 268         if (infoPtr->bFocusHex && (infoPtr->nCaretPos % 2 == 0))
 269         {
 270             memmove(infoPtr->pData + nCaretBytePos - 1,
 271                     infoPtr->pData + nCaretBytePos,
 272                     infoPtr->cbData - nCaretBytePos);
 273             infoPtr->cbData--;
 274             infoPtr->nCaretPos -= 2; /* backtrack two nibble */
 275         }
 276         else /* blank upper nibble */
 277         {
 278             infoPtr->pData[nCaretBytePos] &= 0x0f;
 279             infoPtr->nCaretPos--; /* backtrack one nibble */
 280         }
 281     }
 282     else
 283     {
 284         if (infoPtr->bFocusHex && hexchar_to_byte(ch) == (BYTE)-1)
 285         {
 286             MessageBeep(MB_ICONWARNING);
 287             return 0;
 288         }
 289
 290         if ((infoPtr->bInsert && (infoPtr->nCaretPos % 2 == 0)) || (nCaretBytePos >= infoPtr->cbData))
 291         {
 292             /* make room for another byte */
 293             infoPtr->cbData++;
 294             infoPtr->pData = heap_xrealloc(infoPtr->pData, infoPtr->cbData + 1);
 295
 296             /* move everything after caret up one byte */
 297             memmove(infoPtr->pData + nCaretBytePos + 1,
 298                     infoPtr->pData + nCaretBytePos,
 299                     infoPtr->cbData - nCaretBytePos);
 300             /* zero new byte */
 301             infoPtr->pData[nCaretBytePos] = 0x0;
 302         }
 303
 304         /* overwrite a byte */
 305
 306         assert(nCaretBytePos < infoPtr->cbData);
 307
 308         if (infoPtr->bFocusHex)
 309         {
 310             BYTE orig_byte = infoPtr->pData[nCaretBytePos];
 311             BYTE digit = hexchar_to_byte(ch);
 312             if (infoPtr->nCaretPos % 2) /* set low nibble */
 313                 infoPtr->pData[nCaretBytePos] = (orig_byte & 0xf0) | digit;
 314             else /* set high nibble */
 315                 infoPtr->pData[nCaretBytePos] = (orig_byte & 0x0f) | digit << 4;
 316             infoPtr->nCaretPos++; /* advance one nibble */
 317         }
 318         else
 319         {
 320             infoPtr->pData[nCaretBytePos] = (BYTE)ch;
 321             infoPtr->nCaretPos += 2; /* advance two nibbles */
 322         }
 323     }
 324
 325     HexEdit_UpdateScrollbars(infoPtr);
 326     InvalidateRect(infoPtr->hwndSelf, NULL, TRUE);
 327     HexEdit_UpdateCaret(infoPtr);
 328     HexEdit_EnsureVisible(infoPtr, infoPtr->nCaretPos);
 329     return 0;
 330 }
 331
 332 static inline LRESULT
 333 HexEdit_Destroy (HEXEDIT_INFO *infoPtr)
 334 {
 335     HWND hwnd = infoPtr->hwndSelf;
 336     heap_free(infoPtr->pData);
 337     /* free info data */
 338     heap_free(infoPtr);
 339     SetWindowLongPtrW(hwnd, 0, 0);
 340     return 0;
 341 }
 342
 343 static inline LRESULT
 344 HexEdit_GetFont (HEXEDIT_INFO *infoPtr)
 345 {
 346     return (LRESULT)infoPtr->hFont;
 347 }
 348
 349 static inline LRESULT
 350 HexEdit_KeyDown (HEXEDIT_INFO *infoPtr, DWORD key, DWORD flags)
 351 {
 352     INT nInc = (infoPtr->bFocusHex) ? 1 : 2;
 353     SCROLLINFO si;
 354
 355     switch (key)
 356     {
 357     case VK_LEFT:
 358         infoPtr->nCaretPos -= nInc;
 359         if (infoPtr->nCaretPos < 0)
 360             infoPtr->nCaretPos = 0;
 361         break;
 362     case VK_RIGHT:
 363         infoPtr->nCaretPos += nInc;
 364         if (infoPtr->nCaretPos > infoPtr->cbData*2)
 365             infoPtr->nCaretPos = infoPtr->cbData*2;
 366         break;
 367     case VK_UP:
 368         if ((infoPtr->nCaretPos - infoPtr->nBytesPerLine*2) >= 0)
 369             infoPtr->nCaretPos -= infoPtr->nBytesPerLine*2;
 370         break;
 371     case VK_DOWN:
 372         if ((infoPtr->nCaretPos + infoPtr->nBytesPerLine*2) <= infoPtr->cbData*2)
 373             infoPtr->nCaretPos += infoPtr->nBytesPerLine*2;
 374         break;
 375     case VK_HOME:
 376         infoPtr->nCaretPos = 0;
 377         break;
 378     case VK_END:
 379         infoPtr->nCaretPos = infoPtr->cbData*2;
 380         break;
 381     case VK_PRIOR: /* page up */
 382         si.cbSize = sizeof(si);
 383         si.fMask = SIF_PAGE;
 384         GetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si);
 385         if ((infoPtr->nCaretPos - (INT)si.nPage*infoPtr->nBytesPerLine*2) >= 0)
 386             infoPtr->nCaretPos -= si.nPage*infoPtr->nBytesPerLine*2;
 387         else
 388             infoPtr->nCaretPos = 0;
 389         break;
 390     case VK_NEXT: /* page down */
 391         si.cbSize = sizeof(si);
 392         si.fMask = SIF_PAGE;
 393         GetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si);
 394         if ((infoPtr->nCaretPos + (INT)si.nPage*infoPtr->nBytesPerLine*2) <= infoPtr->cbData*2)
 395             infoPtr->nCaretPos += si.nPage*infoPtr->nBytesPerLine*2;
 396         else
 397             infoPtr->nCaretPos = infoPtr->cbData*2;
 398         break;
 399     default:
 400         return 0;
 401     }
 402
 403     HexEdit_UpdateCaret(infoPtr);
 404     HexEdit_EnsureVisible(infoPtr, infoPtr->nCaretPos);
 405
 406     return 0;
 407 }
 408
 409
 410 static inline LRESULT
 411 HexEdit_KillFocus (HEXEDIT_INFO *infoPtr, HWND receiveFocus)
 412 {
 413     infoPtr->bFocus = FALSE;
 414     DestroyCaret();
 415
 416     return 0;
 417 }
 418
 419
 420 static inline LRESULT
 421 HexEdit_LButtonDown (HEXEDIT_INFO *infoPtr)
 422 {
 423     SetFocus(infoPtr->hwndSelf);
 424
 425     /* FIXME: hittest and set caret */
 426
 427     return 0;
 428 }
 429
 430
 431 static inline LRESULT HexEdit_NCCreate (HWND hwnd, LPCREATESTRUCTW lpcs)
 432 {
 433     HEXEDIT_INFO *infoPtr;
 434     SetWindowLongW(hwnd, GWL_EXSTYLE,
 435                    lpcs->dwExStyle | WS_EX_CLIENTEDGE);
 436
 437     /* allocate memory for info structure */
 438     infoPtr = heap_xalloc(sizeof(HEXEDIT_INFO));
 439     memset(infoPtr, 0, sizeof(HEXEDIT_INFO));
 440     SetWindowLongPtrW(hwnd, 0, (DWORD_PTR)infoPtr);
 441
 442     /* initialize info structure */
 443     infoPtr->nCaretPos = 0;
 444     infoPtr->hwndSelf = hwnd;
 445     infoPtr->nBytesPerLine = 2;
 446     infoPtr->bFocusHex = TRUE;
 447     infoPtr->bInsert = TRUE;
 448
 449     return DefWindowProcW(infoPtr->hwndSelf, WM_NCCREATE, 0, (LPARAM)lpcs);
 450 }
 451
 452 static inline LRESULT
 453 HexEdit_SetFocus (HEXEDIT_INFO *infoPtr, HWND lostFocus)
 454 {
 455     infoPtr->bFocus = TRUE;
 456
 457     CreateCaret(infoPtr->hwndSelf, NULL, 1, infoPtr->nHeight);
 458     HexEdit_UpdateCaret(infoPtr);
 459     ShowCaret(infoPtr->hwndSelf);
 460
 461     return 0;
 462 }
 463
 464
 465 static inline LRESULT
 466 HexEdit_SetFont (HEXEDIT_INFO *infoPtr, HFONT hFont, BOOL redraw)
 467 {
 468     TEXTMETRICW tm;
 469     HDC hdc;
 470     HFONT hOldFont = NULL;
 471     LONG i;
 472     RECT rcClient;
 473
 474     infoPtr->hFont = hFont;
 475
 476     hdc = GetDC(infoPtr->hwndSelf);
 477     if (infoPtr->hFont)
 478         hOldFont = SelectObject(hdc, infoPtr->hFont);
 479
 480     GetTextMetricsW(hdc, &tm);
 481     infoPtr->nHeight = tm.tmHeight + tm.tmExternalLeading;
 482
 483     GetClientRect(infoPtr->hwndSelf, &rcClient);
 484
 485     for (i = 0; ; i++)
 486     {
 487         BYTE *pData = heap_xalloc(i);
 488         WCHAR *lpszLine;
 489         SIZE size;
 490
 491         memset(pData, 0, i);
 492         lpszLine = HexEdit_GetLineText(0, pData, i, 0);
 493         GetTextExtentPoint32W(hdc, lpszLine, lstrlenW(lpszLine), &size);
 494         heap_free(lpszLine);
 495         heap_free(pData);
 496         if (size.cx > (rcClient.right - rcClient.left))
 497         {
 498             infoPtr->nBytesPerLine = i - 1;
 499             break;
 500         }
 501     }
 502
 503     HexEdit_UpdateScrollbars(infoPtr);
 504
 505     if (infoPtr->hFont)
 506         SelectObject(hdc, hOldFont);
 507     ReleaseDC (infoPtr->hwndSelf, hdc);
 508
 509     if (redraw)
 510         InvalidateRect(infoPtr->hwndSelf, NULL, TRUE);
 511
 512     return 0;
 513 }
 514
 515 static inline LRESULT
 516 HexEdit_VScroll (HEXEDIT_INFO *infoPtr, INT action)
 517 {
 518     SCROLLINFO si;
 519
 520     /* get all scroll bar info */
 521     si.cbSize = sizeof(si);
 522     si.fMask  = SIF_ALL;
 523     GetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si);
 524
 525     switch (LOWORD(action))
 526     {
 527     case SB_TOP: /* user pressed the home key */
 528         si.nPos = si.nMin;
 529         break;
 530
 531     case SB_BOTTOM: /* user pressed the end key */
 532         si.nPos = si.nMax;
 533         break;
 534
 535     case SB_LINEUP: /* user clicked the up arrow */
 536         si.nPos -= 1;
 537         break;
 538
 539     case SB_LINEDOWN: /* user clicked the down arrow */
 540         si.nPos += 1;
 541         break;
 542
 543     case SB_PAGEUP: /* user clicked the scroll bar above the scroll thumb */
 544         si.nPos -= si.nPage;
 545         break;
 546
 547     case SB_PAGEDOWN: /* user clicked the scroll bar below the scroll thumb */
 548         si.nPos += si.nPage;
 549         break;
 550
 551     case SB_THUMBTRACK: /* user dragged the scroll thumb */
 552         si.nPos = si.nTrackPos;
 553         break;
 554
 555     default:
 556         break;
 557     }
 558
 559     /* set the position and then retrieve it to let the system handle the
 560      * cases where the position is out of range */
 561     si.fMask = SIF_POS;
 562     SetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si, TRUE);
 563     GetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si);
 564
 565     if (si.nPos != infoPtr->nScrollPos)
 566     {
 567         ScrollWindow(infoPtr->hwndSelf, 0, infoPtr->nHeight * (infoPtr->nScrollPos - si.nPos), NULL, NULL);
 568         infoPtr->nScrollPos = si.nPos;
 569         UpdateWindow(infoPtr->hwndSelf);
 570
 571         /* need to update caret position since it depends on the scroll position */
 572         HexEdit_UpdateCaret(infoPtr);
 573     }
 574     return 0;
 575 }
 576
 577
 578 static LRESULT WINAPI
 579 HexEdit_WindowProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 580 {
 581     HEXEDIT_INFO *infoPtr = (HEXEDIT_INFO *)GetWindowLongPtrW(hwnd, 0);
 582
 583     if (!infoPtr && (uMsg != WM_NCCREATE))
 584         return DefWindowProcW(hwnd, uMsg, wParam, lParam);
 585
 586     switch (uMsg)
 587     {
 588         case HEM_SETDATA:
 589             return HexEdit_SetData (infoPtr, (INT)wParam, (const BYTE *)lParam);
 590
 591         case HEM_GETDATA:
 592             return HexEdit_GetData (infoPtr, (INT)wParam, (BYTE *)lParam);
 593
 594         case WM_CHAR:
 595             return HexEdit_Char (infoPtr, (WCHAR)wParam);
 596
 597         case WM_DESTROY:
 598             return HexEdit_Destroy (infoPtr);
 599
 600         case WM_GETDLGCODE:
 601             return DLGC_WANTCHARS | DLGC_WANTARROWS;
 602
 603         case WM_GETFONT:
 604             return HexEdit_GetFont (infoPtr);
 605
 606         case WM_KEYDOWN:
 607             return HexEdit_KeyDown (infoPtr, wParam, lParam);
 608
 609         case WM_KILLFOCUS:
 610             return HexEdit_KillFocus (infoPtr, (HWND)wParam);
 611
 612         case WM_LBUTTONDOWN:
 613             return HexEdit_LButtonDown (infoPtr);
 614
 615         case WM_NCCREATE:
 616             return HexEdit_NCCreate (hwnd, (LPCREATESTRUCTW)lParam);
 617
 618         case WM_PAINT:
 619             HexEdit_Paint(infoPtr);
 620             return 0;
 621
 622         case WM_SETFOCUS:
 623             return HexEdit_SetFocus (infoPtr, (HWND)wParam);
 624
 625         case WM_SETFONT:
 626             return HexEdit_SetFont (infoPtr, (HFONT)wParam, LOWORD(lParam));
 627
 628         case WM_VSCROLL:
 629             return HexEdit_VScroll (infoPtr, (INT)wParam);
 630
 631         default:
 632             return DefWindowProcW(hwnd, uMsg, wParam, lParam);
 633     }
 634     return 0;
 635 }
 636
 637 void HexEdit_Register(void)
 638 {
 639     WNDCLASSW wndClass;
 640
 641     ZeroMemory(&wndClass, sizeof(WNDCLASSW));
 642     wndClass.style         = 0;
 643     wndClass.lpfnWndProc   = HexEdit_WindowProc;
 644     wndClass.cbClsExtra    = 0;
 645     wndClass.cbWndExtra    = sizeof(HEXEDIT_INFO *);
 646     wndClass.hCursor       = LoadCursorW(0, (const WCHAR *)IDC_IBEAM);
 647     wndClass.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
 648     wndClass.lpszClassName = szHexEditClass;
 649
 650     RegisterClassW(&wndClass);
 651 }