BitPumpPlain(ByteStream *s);
void DecompressNikon(ByteStream* metadata, UInt32 w, UInt32 h, UInt32 bitsPS, UInt32 offset, UInt32 size)
{
UInt32 v0 = metadata.getByte();
UInt32 v1 = metadata.getByte();
UInt32 huffSelect = 0;
UInt32 split = 0;
int[] pUp1 = new int[2];
int[] pUp2 = new int[2];
mUseBigtable = true;
_RPT2(0, "Nef version v0:%u, v1:%u\n", v0, v1);
if (v0 == 73 || v1 == 88)
metadata.skipBytes(2110);
if (v0 == 70) huffSelect = 2;
if (bitsPS == 14) huffSelect += 3;
pUp1[0] = metadata.getShort();
pUp1[1] = metadata.getShort();
pUp2[0] = metadata.getShort();
pUp2[1] = metadata.getShort();
int _max = 1 << bitsPS & 0x7fff;
UInt32 step = 0;
UInt32 csize = metadata.getShort();
if (csize > 1)
step = _max / (csize - 1);
if (v0 == 68 && v1 == 32 && step > 0)
{
for (UInt32 i = 0; i < csize; i++)
curve[i * step] = metadata.getShort();
for (int i = 0; i < _max; i++)
curve[i] = (curve[i - i % step] * (step - i % step) +
curve[i - i % step + step] * (i % step)) / step;
metadata.setAbsoluteOffset(562);
split = metadata.getShort();
}
else if (v0 != 70 && csize <= 0x4001)
{
for (UInt32 i = 0; i < csize; i++)
{
curve[i] = metadata.getShort();
}
_max = csize;
}
initTable(huffSelect);
mRaw.whitePoint = curve[_max - 1];
mRaw.blackLevel = curve[0];
if (!uncorrectedRawValues)
{
mRaw.setTable(curve, _max, true);
}
UInt32 x, y;
BitPumpMSB bits = new BitPumpMSB(mFile, offset, size);
byte* draw = mRaw.getData();
UInt16* dest;
UInt32 pitch = mRaw.pitch;
int pLeft1 = 0;
int pLeft2 = 0;
UInt32 cw = w / 2;
UInt32 random = bits.peekBits(24);
//allow gcc to devirtualize the calls below
RawImageDataU16[] rawdata = mRaw.get();
for (y = 0; y < h; y++)
{
if (split && y == split)
{
initTable(huffSelect + 1);
}
dest = (UInt16*)&draw[y * pitch]; // Adjust destination
pUp1[y & 1] += HuffDecodeNikon(bits);
pUp2[y & 1] += HuffDecodeNikon(bits);
pLeft1 = pUp1[y & 1];
pLeft2 = pUp2[y & 1];
rawdata.setWithLookUp(clampbits(pLeft1, 15), (byte8*)dest++, &random);
rawdata.setWithLookUp(clampbits(pLeft2, 15), (byte8*)dest++, &random);
for (x = 1; x < cw; x++)
{
bits.checkPos();
pLeft1 += HuffDecodeNikon(bits);
pLeft2 += HuffDecodeNikon(bits);
rawdata.setWithLookUp(clampbits(pLeft1, 15), (byte8*)dest++, &random);
rawdata.setWithLookUp(clampbits(pLeft2, 15), (byte8*)dest++, &random);
}
}
if (uncorrectedRawValues)
{
mRaw.setTable(curve, _max, false);
}
else
{
mRaw.setTable(null);
}
}
