/* mac.c - class description for interface from MACpaint format to image */ /* Copyright Carnegie Mellon University 1992 - All rights reserved $Disclaimer: * Permission to use, copy, modify, and distribute this software and its * documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and that * both that copyright notice, this permission notice, and the following * disclaimer appear in supporting documentation, and that the names of * IBM, Carnegie Mellon University, and other copyright holders, not be * used in advertising or publicity pertaining to distribution of the software * without specific, written prior permission. * * IBM, CARNEGIE MELLON UNIVERSITY, AND THE OTHER COPYRIGHT HOLDERS * DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT * SHALL IBM, CARNEGIE MELLON UNIVERSITY, OR ANY OTHER COPYRIGHT HOLDER * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY * DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. * $ */ /* * * adapted from code by Patrick Naughton (naughton@sun.soe.clarkson.edu) * * macin.c * Mark Majhor * August 1990 * * routines for reading MAC files * * Copyright 1990 Mark Majhor (see the included file * "mrmcpyrght.h" for complete copyright information) */ #ifndef _MRM_COPYRIGHT_ /**** Copyright 1990 Mark Majhor Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. The author makes no representations about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty. THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ****/ #ifndef __SABER__ static char *MRMCopyright = "Copyright 1990 Mark Majhor"; #endif #define _MRM_COPYRIGHT_ #endif #include #include #include #include #include #include #include /**** ** ** local variables ** ****/ static BYTE file_open = 0; /* status flags */ static BYTE image_open = 0; static FILE *ins; /* input stream */ /**** ** ** global variables ** ****/ static int macin_img_width; /* image width */ static int macin_img_height; /* image height */ static int macin_img_depth; /* image depth */ static int macin_img_planes; /* image planes */ static int macin_img_BPL; /* image bytes per line */ /* * open MAC image in the input stream; returns MACIN_SUCCESS if * successful. (might also return various MACIN_ERR codes.) */ /* ARGSUSED */ static int macin_open_image(s) FILE *s; { BYTE mhdr[MAC_HDR_LEN]; char *hp; /* header pointer */ /* make sure there isn't already a file open */ if (file_open) return(MACIN_ERR_FAO); /* remember that we've got this file open */ file_open = 1; ins = s; /* * the mac paint files that came with xmac had an extra * 128 byte header on the front, with a image name in it. * true mac paint images don't seem to have this extra * header. The following code tries to figure out what * type the image is and read the right amount of file * header (512 or 640 bytes). */ /* read in the mac file header */ hp = (char *) mhdr; if (fread((byte *)hp, 1, ADD_HDR_LEN, ins) != ADD_HDR_LEN) return MACIN_ERR_EOF; if (mhdr[0] != MAC_MAGIC) return MACIN_ERR_BAD_SD; /* Get image name (if available) */ if (mhdr[1] != 0) { /* if name header */ if (fread((byte *)hp, 1, MAC_HDR_LEN, ins) != MAC_HDR_LEN) return MACIN_ERR_EOF; } else /* else read rest of header */ if (fread((byte *)hp, 1, MAC_HDR_LEN - ADD_HDR_LEN, ins) != MAC_HDR_LEN - ADD_HDR_LEN) return MACIN_ERR_EOF; /* Now set relevant values */ macin_img_width = BYTES_LINE * 8; macin_img_height = MAX_LINES; macin_img_depth = 1; /* always monochrome */ macin_img_planes = 1; /* always 1 */ macin_img_BPL = BYTES_LINE; return MACIN_SUCCESS; } /* * close an open MAC file */ static int macin_close_file() { /* make sure there's a file open */ if (!file_open) return MACIN_ERR_NFO; /* mark file (and image) as closed */ file_open = 0; image_open = 0; /* done! */ return MACIN_SUCCESS; } #if 0 /* * semi-graceful fatal error mechanism */ static macin_fatal(msg) char *msg; { printf("Error reading MacPaint file: %s\n", msg); exit(0); } #endif /* * these are the routines added for interfacing to xloadimage */ /* * tell someone what the image we're loading is. this could be a little more * descriptive but I don't care */ static void tellAboutImage(name) char *name; { printf("%s is a %dx%d MacPaint image\n", name, macin_img_width, macin_img_height); } int mac__Load( mac, fullname, fp ) struct mac *mac; char *fullname; FILE *fp; { FILE *f; BYTE *pixptr, ch; int eof; register int scanLine; register unsigned int i, j, k; if((f = fp) == 0) { if (! (f = fopen(fullname, "r"))) { fprintf(stderr, "Couldn't open mac file %s.\n", fullname); return(-1); } } if (macin_open_image(f) != MACIN_SUCCESS) { /* read image header */ macin_close_file(); fclose(f); return(-1); } mac_newBitImage(mac, macin_img_width, macin_img_height); pixptr = &(mac_Data(mac)[0]); scanLine = 0; k = 0; while (scanLine < macin_img_height) { if ((eof = fgetc(f)) == -1) break; ch = (BYTE) eof; /* Count byte */ i = (unsigned int) ch; if (ch < 0x80) { /* Unpack next (I+1) chars as is */ for (j = 0; j <= i; j++) { if (scanLine < macin_img_height) { if ((eof = fgetc(f)) == -1) break; *pixptr++ = (BYTE) eof; k++; if (!(k %= BYTES_LINE)) { scanLine++; } } } } else { /* Repeat next char (2's comp I) times */ if ((eof = fgetc(f)) == -1) break; ch = (BYTE) eof; for (j = 0; j <= 256 - i; j++) { if (scanLine < macin_img_height) { *pixptr++ = (BYTE) ch; k++; if (!(k %= BYTES_LINE)) { scanLine++; } } } } } if (scanLine < macin_img_height) { fclose(f); return -1; } macin_close_file(); fclose(f); return(0); } int mac__Ident( classID, fullname ) struct classheader *classID; char *fullname; { FILE *f; unsigned int ret; if (! (f = fopen(fullname, "r"))) return(0); if (macin_open_image(f) == MACIN_SUCCESS) { tellAboutImage(fullname); ret = 1; } else ret = 0; macin_close_file(); fclose(f); return(ret); } long mac__Read( self, file, id ) struct mac *self; FILE *file; long id; { if(mac_Load(self, NULL, file) == 0) return(dataobject_NOREADERROR); else return(dataobject_BADFORMAT); } long mac__Write( self, file, writeID, level ) struct mac *self; FILE *file; long writeID; int level; { return(super_Write(self, file, writeID, level)); } long mac__WriteNative( self, file, filename ) struct mac *self; FILE *file; char *filename; { return(0); }