297 int DiskIO::Read(void* buffer, int numBytes) {  in Read()  argument
309       if (numBytes <= blockSize) {  in Read()
313          numBlocks = numBytes / blockSize;  in Read()
314          if ((numBytes % blockSize) != 0)  in Read()
325       memcpy(buffer, tempSpace, numBytes);  in Read()
328       if (((numBlocks * blockSize) != numBytes) && (retval > 0))  in Read()
329          retval = numBytes;  in Read()
340 int DiskIO::Write(void* buffer, int numBytes) {  in Write()  argument
352       if (numBytes <= blockSize) {  in Write()
356          numBlocks = numBytes / blockSize;  in Write()
357          if ((numBytes % blockSize) != 0) numBlocks++;  in Write()
366       memcpy(tempSpace, buffer, numBytes);  in Write()
367       for (i = numBytes; i < numBlocks * blockSize; i++) {  in Write()
373       if (((numBlocks * blockSize) != numBytes) && (retval > 0))  in Write()
374          retval = numBytes;  in Write()