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/* |
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Teem: Tools to process and visualize scientific data and images . |
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Copyright (C) 2013, 2012, 2011, 2010, 2009 University of Chicago |
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Copyright (C) 2008, 2007, 2006, 2005 Gordon Kindlmann |
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Copyright (C) 2004, 2003, 2002, 2001, 2000, 1999, 1998 University of Utah |
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This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public License |
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(LGPL) as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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The terms of redistributing and/or modifying this software also |
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include exceptions to the LGPL that facilitate static linking. |
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This library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Lesser General Public License for more details. |
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You should have received a copy of the GNU Lesser General Public License |
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along with this library; if not, write to Free Software Foundation, Inc., |
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "nrrd.h" |
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static void |
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_nrrdSwap16Endian(void *_data, size_t N) { |
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unsigned short *data, dd, fix, mask; |
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size_t I; |
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if (!_data) { |
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return; |
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} |
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data = AIR_CAST(unsigned short *, _data); |
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mask = AIR_CAST(unsigned short, 0x00FFu); |
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for (I=0; I<N; I++) { |
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dd = data[I]; |
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fix = (dd & mask); dd >>= 0x08; |
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fix = (dd & mask) | AIR_CAST(unsigned short, fix << 0x08); |
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data[I] = fix; |
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} |
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} |
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static void |
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_nrrdSwap32Endian(void *_data, size_t N) { |
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unsigned int *data, dd, fix, mask; |
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size_t I; |
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if (!_data) { |
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return; |
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} |
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data = AIR_CAST(unsigned int *, _data); |
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mask = 0x000000FFu; |
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for (I=0; I<N; I++) { |
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dd = data[I]; |
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fix = (dd & mask); dd >>= 0x08; |
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fix = (dd & mask) | (fix << 0x08); dd >>= 0x08; |
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fix = (dd & mask) | (fix << 0x08); dd >>= 0x08; |
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fix = (dd & mask) | (fix << 0x08); |
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data[I] = fix; |
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} |
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} |
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static void |
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_nrrdSwap64Endian(void *_data, size_t N) { |
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airULLong *data, dd, fix, mask; |
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size_t I; |
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if (!_data) { |
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return; |
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} |
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data = AIR_CAST(airULLong *, _data); |
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mask = AIR_ULLONG(0x00000000000000FF); |
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for (I=0; I<N; I++) { |
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dd = data[I]; |
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fix = (dd & mask); dd >>= 0x08; |
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fix = (dd & mask) | (fix << 0x08); dd >>= 0x08; |
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fix = (dd & mask) | (fix << 0x08); dd >>= 0x08; |
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fix = (dd & mask) | (fix << 0x08); dd >>= 0x08; |
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fix = (dd & mask) | (fix << 0x08); dd >>= 0x08; |
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fix = (dd & mask) | (fix << 0x08); dd >>= 0x08; |
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fix = (dd & mask) | (fix << 0x08); dd >>= 0x08; |
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fix = (dd & mask) | (fix << 0x08); |
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data[I] = fix; |
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} |
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} |
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static void |
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_nrrdNoopEndian(void *data, size_t N) { |
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AIR_UNUSED(data); |
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AIR_UNUSED(N); |
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return; |
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} |
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static void |
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_nrrdBlockEndian(void *data, size_t N) { |
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char me[]="_nrrdBlockEndian"; |
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AIR_UNUSED(data); |
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AIR_UNUSED(N); |
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fprintf(stderr, "%s: WARNING: can't fix endiannes of nrrd type %s\n", me, |
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airEnumStr(nrrdType, nrrdTypeBlock)); |
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} |
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static void |
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(*_nrrdSwapEndian[])(void *, size_t) = { |
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_nrrdNoopEndian, /* 0: nobody knows! */ |
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_nrrdNoopEndian, /* 1: signed 1-byte integer */ |
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_nrrdNoopEndian, /* 2: unsigned 1-byte integer */ |
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_nrrdSwap16Endian, /* 3: signed 2-byte integer */ |
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_nrrdSwap16Endian, /* 4: unsigned 2-byte integer */ |
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_nrrdSwap32Endian, /* 5: signed 4-byte integer */ |
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_nrrdSwap32Endian, /* 6: unsigned 4-byte integer */ |
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_nrrdSwap64Endian, /* 7: signed 8-byte integer */ |
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_nrrdSwap64Endian, /* 8: unsigned 8-byte integer */ |
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_nrrdSwap32Endian, /* 9: 4-byte floating point */ |
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_nrrdSwap64Endian, /* 10: 8-byte floating point */ |
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_nrrdBlockEndian /* 11: size user defined at run time */ |
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}; |
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void |
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nrrdSwapEndian(Nrrd *nrrd) { |
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if (nrrd |
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&& nrrd->data |
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&& !airEnumValCheck(nrrdType, nrrd->type)) { |
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_nrrdSwapEndian[nrrd->type](nrrd->data, nrrdElementNumber(nrrd)); |
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} |
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return; |
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} |