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1 import sys
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132
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2 from PyQt4.QtCore import *
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3 from PyQt4.QtGui import *
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4
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139
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5 BYTES_PER_LINE, GAP = 8, 12
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136
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6
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7 def clamp(minimum, x, maximum):
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8 return max(minimum, min(x, maximum))
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9
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10 def asciiChar(v):
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11 if v < 0x20 or v > 0x7e:
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12 return '.'
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13 else:
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14 return chr(v)
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133
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15
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16 class BinViewer(QWidget):
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17 """ The view has an address, hex byte and ascii column """
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18 def __init__(self, scrollArea):
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135
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19 super().__init__(scrollArea)
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20 self.scrollArea = scrollArea
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21 self.setFont(QFont('Courier', 18))
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22 self.setFocusPolicy(Qt.StrongFocus)
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23 self.blinkcursor = False
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24 self.cursorX = self.cursorY = 0
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25 self.scrollArea = scrollArea
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26 self.Data = bytearray()
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27 self.Offset = 0
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28 t = QTimer(self)
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29 t.timeout.connect(self.updateCursor)
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30 t.setInterval(500)
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31 t.start()
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32 def updateCursor(self):
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33 self.blinkcursor = not self.blinkcursor
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34 self.update(self.cursorX, self.cursorY, self.charWidth, self.charHeight)
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35 def setCursorPosition(self, position):
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36 position = clamp(0, int(position), len(self.Data) * 2 - 1)
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37 self.cursorPosition = position
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38 x = position % (2 * BYTES_PER_LINE)
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39 x = x + int(x / 2) # Create a gap between hex values
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40 self.cursorX = self.xposHex + x * self.charWidth
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41 y = int(position / (2 * BYTES_PER_LINE))
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42 self.cursorY = y * self.charHeight + 2
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43 self.blinkcursor = True
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44 self.update()
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45 def getCursorPosition(self):
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46 return self.cursorPosition
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47 CursorPosition = property(getCursorPosition, setCursorPosition)
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48 def setOffset(self, off):
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49 self.offset = off
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50 self.update()
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51 Offset = property(lambda self: self.offset, setOffset)
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52 def paintEvent(self, event):
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53 # Helper variables:
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54 er = event.rect()
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55 chw, chh = self.charWidth, self.charHeight
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56 painter = QPainter(self)
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57 # Background:
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58 painter.fillRect(er, self.palette().color(QPalette.Base))
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59 painter.fillRect(QRect(self.xposAddr, er.top(), 8 * chw, er.bottom() + 1), Qt.gray)
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60 painter.setPen(Qt.gray)
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61 x = self.xposAscii - (GAP / 2)
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62 painter.drawLine(x, er.top(), x, er.bottom())
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63 x = self.xposEnd - (GAP / 2)
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64 painter.drawLine(x, er.top(), x, er.bottom())
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133
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65 # first and last index
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66 firstIndex = max((int(er.top() / chh) - chh) * BYTES_PER_LINE, 0)
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67 lastIndex = max((int(er.bottom() / chh) + chh) * BYTES_PER_LINE, 0)
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68 yposStart = int(firstIndex / BYTES_PER_LINE) * chh + chh
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69 # Draw contents:
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70 painter.setPen(Qt.black)
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71 ypos = yposStart
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72 for index in range(firstIndex, lastIndex, BYTES_PER_LINE):
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73 painter.drawText(self.xposAddr, ypos, '{0:08X}'.format(index + self.Offset))
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74 xpos = self.xposHex
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75 xposAscii = self.xposAscii
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76 for colIndex in range(BYTES_PER_LINE):
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77 if index + colIndex < len(self.Data):
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78 b = self.Data[index + colIndex]
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79 painter.drawText(xpos, ypos, '{0:02X}'.format(b))
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80 painter.drawText(xposAscii, ypos, asciiChar(b))
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81 xpos += 3 * chw
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82 xposAscii += chw
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83 ypos += chh
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84 # cursor
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85 if self.blinkcursor:
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86 painter.fillRect(self.cursorX, self.cursorY + chh - 2, chw, 2, Qt.black)
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87 def keyPressEvent(self, event):
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88 if event.matches(QKeySequence.MoveToNextChar):
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89 self.CursorPosition += 1
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90 if event.matches(QKeySequence.MoveToPreviousChar):
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91 self.CursorPosition -= 1
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92 if event.matches(QKeySequence.MoveToNextLine):
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93 self.CursorPosition += 2 * BYTES_PER_LINE
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94 if event.matches(QKeySequence.MoveToPreviousLine):
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95 self.CursorPosition -= 2 * BYTES_PER_LINE
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96 if event.matches(QKeySequence.MoveToNextPage):
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97 rows = int(self.scrollArea.viewport().height() / self.charHeight)
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98 self.CursorPosition += (rows - 1) * 2 * BYTES_PER_LINE
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99 if event.matches(QKeySequence.MoveToPreviousPage):
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100 rows = int(self.scrollArea.viewport().height() / self.charHeight)
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101 self.CursorPosition -= (rows - 1) * 2 * BYTES_PER_LINE
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102 char = event.text().lower()
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103 if char and char in '0123456789abcdef':
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104 i = int(self.CursorPosition / 2)
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105 hb = self.CursorPosition % 2
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106 v = int(char, 16)
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107 if hb == 0:
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108 # high half byte
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109 self.data[i] = (self.data[i] & 0xF) | (v << 4)
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110 else:
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111 self.data[i] = (self.data[i] & 0xF0) | v
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112 self.CursorPosition += 1
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113 self.scrollArea.ensureVisible(self.cursorX, self.cursorY + self.charHeight / 2, 4, self.charHeight / 2 + 4)
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114 self.update()
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115 def setCursorPositionAt(self, pos):
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116 """ Calculate cursor position at a certain point """
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117 if pos.x() > self.xposHex and pos.x() < self.xposAscii:
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118 x = round((2 * (pos.x() - self.xposHex)) / (self.charWidth * 3))
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119 y = int(pos.y() / self.charHeight) * 2 * BYTES_PER_LINE
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120 self.setCursorPosition(x + y)
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121 def mousePressEvent(self, event):
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122 self.setCursorPositionAt(event.pos())
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123 def adjust(self):
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124 self.charHeight = self.fontMetrics().height()
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125 self.charWidth = self.fontMetrics().width('x')
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126 self.xposAddr = GAP
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127 self.xposHex = self.xposAddr + 8 * self.charWidth + GAP
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128 self.xposAscii = self.xposHex + (BYTES_PER_LINE * 3 - 1) * self.charWidth + GAP
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129 self.xposEnd = self.xposAscii + self.charWidth * BYTES_PER_LINE + GAP
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130 self.setMinimumWidth(self.xposEnd)
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131 sbw = self.scrollArea.verticalScrollBar().width()
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132 self.scrollArea.setMinimumWidth(self.xposEnd + sbw + 5)
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133 r = len(self.Data) % BYTES_PER_LINE
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134 r = 1 if r > 0 else 0
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135 self.setMinimumHeight((int(len(self.Data) / BYTES_PER_LINE) + r) * self.charHeight + 4)
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136 self.scrollArea.setMinimumHeight(self.charHeight * 8)
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137 self.update()
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138 def setData(self, d):
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139 self.data = d
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140 self.adjust()
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141 self.setCursorPosition(0)
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142 Data = property(lambda self: self.data, setData)
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143
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144 class HexEdit(QScrollArea):
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145 def __init__(self):
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146 super().__init__()
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147 self.bv = BinViewer(self)
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148 self.setWidget(self.bv)
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149 self.setWidgetResizable(True)
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150 self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
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151 self.setFocusPolicy(Qt.NoFocus)
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152
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153 if __name__ == '__main__':
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154 app = QApplication(sys.argv)
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155 he = HexEdit()
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156 he.show()
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157 he.bv.Data = bytearray(range(100)) * 8 + b'x'
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158 app.exec()
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159
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