Mercurial Repositories > eric / file comparison
comparison: eric6/HexEdit/HexEditChunks.py
eric6/HexEdit/HexEditChunks.py
- changeset 8143
- 2c730d5fd177
- parent 7923
- 91e843545d9a
- child 8207
- d359172d11be
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| 8141:27f636beebad | 8143:2c730d5fd177 |
|---|---|
| 31 | 31 |
| 32 When HexEditWidget loads data, HexEditChunks access them using a QIODevice | 32 When HexEditWidget loads data, HexEditChunks access them using a QIODevice |
| 33 interface. When the app uses a QByteArray or Python bytearray interface, | 33 interface. When the app uses a QByteArray or Python bytearray interface, |
| 34 QBuffer is used to provide again a QIODevice like interface. No data will | 34 QBuffer is used to provide again a QIODevice like interface. No data will |
| 35 be changed, therefore HexEditChunks opens the QIODevice in | 35 be changed, therefore HexEditChunks opens the QIODevice in |
| 36 QIODevice.ReadOnly mode. After every access HexEditChunks closes the | 36 QIODevice.OpenModeFlag.ReadOnly mode. After every access HexEditChunks |
| 37 QIODevice. That's why external applications can overwrite files while | 37 closes the QIODevice. That's why external applications can overwrite |
| 38 HexEditWidget shows them. | 38 files while HexEditWidget shows them. |
| 39 | 39 |
| 40 When the the user starts to edit the data, HexEditChunks creates a local | 40 When the the user starts to edit the data, HexEditChunks creates a local |
| 41 copy of a chunk of data (4 kilobytes) and notes all changes there. Parallel | 41 copy of a chunk of data (4 kilobytes) and notes all changes there. Parallel |
| 42 to that chunk, there is a second chunk, which keeps track of which bytes | 42 to that chunk, there is a second chunk, which keeps track of which bytes |
| 43 are changed and which are not. | 43 are changed and which are not. |
| 72 @type QIODevice | 72 @type QIODevice |
| 73 @return flag indicating successful operation | 73 @return flag indicating successful operation |
| 74 @rtype bool | 74 @rtype bool |
| 75 """ | 75 """ |
| 76 self.__ioDevice = ioDevice | 76 self.__ioDevice = ioDevice |
| 77 ok = self.__ioDevice.open(QIODevice.ReadOnly) | 77 ok = self.__ioDevice.open(QIODevice.OpenModeFlag.ReadOnly) |
| 78 if ok: | 78 if ok: |
| 79 # open successfully | 79 # open successfully |
| 80 self.__size = self.__ioDevice.size() | 80 self.__size = self.__ioDevice.size() |
| 81 self.__ioDevice.close() | 81 self.__ioDevice.close() |
| 82 else: | 82 else: |
| 117 if maxSize < 0: | 117 if maxSize < 0: |
| 118 maxSize = self.__size | 118 maxSize = self.__size |
| 119 elif (pos + maxSize) > self.__size: | 119 elif (pos + maxSize) > self.__size: |
| 120 maxSize = self.__size - pos | 120 maxSize = self.__size - pos |
| 121 | 121 |
| 122 self.__ioDevice.open(QIODevice.ReadOnly) | 122 self.__ioDevice.open(QIODevice.OpenModeFlag.ReadOnly) |
| 123 | 123 |
| 124 while maxSize > 0: | 124 while maxSize > 0: |
| 125 chunk.absPos = sys.maxsize | 125 chunk.absPos = sys.maxsize |
| 126 chunksLoopOngoing = True | 126 chunksLoopOngoing = True |
| 127 while chunkIdx < len(self.__chunks) and chunksLoopOngoing: | 127 while chunkIdx < len(self.__chunks) and chunksLoopOngoing: |
| 183 """ | 183 """ |
| 184 if count == -1: | 184 if count == -1: |
| 185 # write all data | 185 # write all data |
| 186 count = self.__size | 186 count = self.__size |
| 187 | 187 |
| 188 ok = ioDevice.open(QIODevice.WriteOnly) | 188 ok = ioDevice.open(QIODevice.OpenModeFlag.WriteOnly) |
| 189 if ok: | 189 if ok: |
| 190 idx = pos | 190 idx = pos |
| 191 while idx < count: | 191 while idx < count: |
| 192 data = self.data(idx, self.BUFFER_SIZE) | 192 data = self.data(idx, self.BUFFER_SIZE) |
| 193 ioDevice.write(QByteArray(data)) | 193 ioDevice.write(QByteArray(data)) |
| 432 | 432 |
| 433 if foundIdx == -1: | 433 if foundIdx == -1: |
| 434 newChunk = HexEditChunk() | 434 newChunk = HexEditChunk() |
| 435 readAbsPos = absPos - ioDelta | 435 readAbsPos = absPos - ioDelta |
| 436 readPos = readAbsPos & self.READ_CHUNK_MASK | 436 readPos = readAbsPos & self.READ_CHUNK_MASK |
| 437 self.__ioDevice.open(QIODevice.ReadOnly) | 437 self.__ioDevice.open(QIODevice.OpenModeFlag.ReadOnly) |
| 438 self.__ioDevice.seek(readPos) | 438 self.__ioDevice.seek(readPos) |
| 439 newChunk.data = bytearray(self.__ioDevice.read(self.CHUNK_SIZE)) | 439 newChunk.data = bytearray(self.__ioDevice.read(self.CHUNK_SIZE)) |
| 440 self.__ioDevice.close() | 440 self.__ioDevice.close() |
| 441 newChunk.absPos = absPos - (readAbsPos - readPos) | 441 newChunk.absPos = absPos - (readAbsPos - readPos) |
| 442 newChunk.dataChanged = bytearray(len(newChunk.data)) | 442 newChunk.dataChanged = bytearray(len(newChunk.data)) |
