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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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#include "privateNrrd.h" |
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static const int |
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_nrrdWriteHexTable[16] = { |
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'0', '1', '2', '3', '4', '5', '6', '7', |
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'8', '9', 'a', 'b', 'c', 'd', 'e', 'f' |
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}; |
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/* |
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** -2: not allowed, error |
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** -1: whitespace |
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** [0,15]: values |
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*/ |
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static const int |
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_nrrdReadHexTable[128] = { |
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/* 0 1 2 3 4 5 6 7 8 9 */ |
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -1, /* 0 */ |
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-1, -1, -1, -1, -2, -2, -2, -2, -2, -2, /* 10 */ |
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, /* 20 */ |
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-2, -2, -1, -2, -2, -2, -2, -2, -2, -2, /* 30 */ |
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-2, -2, -2, -2, -2, -2, -2, -2, 0, 1, /* 40 */ |
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2, 3, 4, 5, 6, 7, 8, 9, -2, -2, /* 50 */ |
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-2, -2, -2, -2, -2, 10, 11, 12, 13, 14, /* 60 */ |
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15, -2, -2, -2, -2, -2, -2, -2, -2, -2, /* 70 */ |
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, /* 80 */ |
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-2, -2, -2, -2, -2, -2, -2, 10, 11, 12, /* 90 */ |
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13, 14, 15, -2, -2, -2, -2, -2, -2, -2, /* 100 */ |
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, /* 110 */ |
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-2, -2, -2, -2, -2, -2, -2, -2 /* 120 */ |
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}; |
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static int |
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_nrrdEncodingHex_available(void) { |
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return AIR_TRUE; |
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} |
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static int |
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_nrrdEncodingHex_read(FILE *file, void *_data, size_t elNum, |
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Nrrd *nrrd, NrrdIoState *nio) { |
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static const char me[]="_nrrdEncodingHex_read"; |
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size_t nibIdx, nibNum; |
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unsigned char *data; |
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int car=0, nib; |
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AIR_UNUSED(nio); |
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data = AIR_CAST(unsigned char *, _data); |
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nibIdx = 0; |
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nibNum = 2*elNum*nrrdElementSize(nrrd); |
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if (nibNum/elNum != 2*nrrdElementSize(nrrd)) { |
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biffAddf(NRRD, "%s: size_t can't hold 2*(#bytes in array)\n", me); |
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return 1; |
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} |
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while (nibIdx < nibNum) { |
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unsigned char nibshift; |
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car = fgetc(file); |
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if (EOF == car) break; |
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nib = _nrrdReadHexTable[car & 127]; |
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if (-2 == nib) { |
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/* not a valid hex character */ |
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break; |
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} |
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if (-1 == nib) { |
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/* its white space */ |
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continue; |
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} |
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/* else it is a valid character, representing a value from 0 to 15 */ |
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nibshift = AIR_CAST(unsigned char, nib << (4*(1-(nibIdx & 1)))); |
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/* HEY not sure why the cast is needed with gcc v4.8 -Wconversion */ |
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*data = AIR_CAST(unsigned char, *data + nibshift); |
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data += nibIdx & 1; |
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nibIdx++; |
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} |
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if (nibIdx != nibNum) { |
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char stmp1[AIR_STRLEN_SMALL], stmp2[AIR_STRLEN_SMALL]; |
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if (EOF == car) { |
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biffAddf(NRRD, "%s: hit EOF getting byte %s of %s", me, |
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airSprintSize_t(stmp1, nibIdx/2), |
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airSprintSize_t(stmp2, nibNum/2)); |
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} else { |
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biffAddf(NRRD, "%s: hit invalid character ('%c') getting " |
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"byte %s of %s", me, car, |
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airSprintSize_t(stmp1, nibIdx/2), |
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airSprintSize_t(stmp2, nibNum/2)); |
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} |
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return 1; |
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} |
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return 0; |
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} |
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static int |
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_nrrdEncodingHex_write(FILE *file, const void *_data, size_t elNum, |
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const Nrrd *nrrd, NrrdIoState *nio) { |
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/* static const char me[]="_nrrdEncodingHex_write"; */ |
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const unsigned char *data; |
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size_t byteIdx, byteNum; |
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unsigned int bytesPerLine; |
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bytesPerLine = AIR_MAX(1, nio->charsPerLine/2); |
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data = AIR_CAST(const unsigned char*, _data); |
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byteNum = elNum*nrrdElementSize(nrrd); |
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for (byteIdx=0; byteIdx<byteNum; byteIdx++) { |
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fprintf(file, "%c%c", |
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_nrrdWriteHexTable[(*data)>>4], |
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_nrrdWriteHexTable[(*data)&15]); |
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if (bytesPerLine-1 == byteIdx % bytesPerLine) { |
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fprintf(file, "\n"); |
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} |
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data++; |
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} |
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/* just to be sure, we always end with a carraige return */ |
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fprintf(file, "\n"); |
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return 0; |
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} |
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const NrrdEncoding |
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_nrrdEncodingHex = { |
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"hex", /* name */ |
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"hex", /* suffix */ |
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AIR_TRUE, /* endianMatters */ |
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AIR_FALSE, /* isCompression */ |
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_nrrdEncodingHex_available, |
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_nrrdEncodingHex_read, |
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_nrrdEncodingHex_write |
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}; |
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const NrrdEncoding *const |
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nrrdEncodingHex = &_nrrdEncodingHex; |