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/* Functions to read and write PNM files. Written for use in a Computer Vision course. Copyright (C) 2002 Lior Okman This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include "pfuncs.h" /* Declare the actual headers */ static const char MAGICNUMBERS[6][3] = { "P1" , "P2", "P3", "P4", "P5", "P6" }; /* Some local functions (see comment before each function for information) */ static int read_pfile_header(FILE *inPictureFile, tPfile *outPicture); static int read_pfile_binary_data(FILE *inPictureFile, tPfile *outPicture); static int read_pfile_ascii_data(FILE *inPictureFile, tPfile *outPicture); static int write_pfile_header(FILE *inPictureFile, tPfile *inPicture, const char *inComment, int inSaveRaw); static int write_pfile_binary_data(FILE *inPictureFile, tPfile *inPicture); static int write_pfile_ascii_data(FILE *inPictureFile, tPfile *inPicture); /* read_pfile * Parameters: inFileName - the filename to read * outPicture - Pre-allocated structure that will be filled. * Returns : PFUNCS_TRUE/PFUNCS_FALSE for success/failure * Remarks : outPicture should be allocated before calling this function, * but outPicture->Data will be malloc`ed here. Remember to free * the memory when finished with it by calling free_pfile. The * previous contents of outPicture->Data will be destroyed. You * have been warned. */ int read_pfile( const char *inFileName, tPfile *outPicture) { FILE *PictureFile = NULL; int RetVal; /* Sanity check and try to open the file */ if (!inFileName || !outPicture || !(PictureFile = fopen(inFileName, "rb"))) { return PFUNCS_FALSE; } /* Read the header*/ RetVal = read_pfile_header(PictureFile, outPicture); /* Get the data - NOTE: this destroys the pointer outPicture->Data. * Make sure that nothing important is in it before you call this function */ if (RetVal && (RetVal = alloc_pfile(outPicture))) { if (IS_BINARY(outPicture->PicType)) { RetVal = read_pfile_binary_data(PictureFile, outPicture); } else { RetVal = read_pfile_ascii_data(PictureFile, outPicture); } } fclose(PictureFile); return RetVal; } /* write_pfile * Parameters: inFileName - The intended filename.
Approximate Word count = 1567
Approximate Pages = 6.3
(250 words per page double spaced)
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