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https://github.com/RGBCube/serenity
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8293a0ff36
This way subclasses only have to implement readBlock() and writeBlock(). read() and write() require that the offset and length are both divisible by the blockSize().
45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
#include "DiskDevice.h"
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DiskDevice::DiskDevice()
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{
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}
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DiskDevice::~DiskDevice()
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{
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}
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bool DiskDevice::read(qword offset, unsigned length, byte* out) const
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{
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ASSERT((offset % blockSize()) == 0);
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ASSERT((length % blockSize()) == 0);
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qword firstBlock = offset / blockSize();
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qword endBlock = (offset + length) / blockSize();
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ASSERT(firstBlock <= 0xffffffff);
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ASSERT(endBlock <= 0xffffffff);
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byte* outptr = out;
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unsigned remainingCount = length;
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for (unsigned bi = firstBlock; bi < endBlock; ++bi) {
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if (!readBlock(bi, outptr))
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return false;
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outptr += blockSize();
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}
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return true;
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}
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bool DiskDevice::write(qword offset, unsigned length, const byte* in)
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{
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ASSERT((offset % blockSize()) == 0);
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ASSERT((length % blockSize()) == 0);
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qword firstBlock = offset / blockSize();
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qword endBlock = (offset + length) / blockSize();
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ASSERT(firstBlock <= 0xffffffff);
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ASSERT(endBlock <= 0xffffffff);
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const byte* inptr = in;
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for (unsigned bi = firstBlock; bi < endBlock; ++bi) {
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if (!writeBlock(bi, inptr))
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return false;
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inptr += blockSize();
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}
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return true;
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}
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