diff options
Diffstat (limited to 'converter/pbm/mgrtopbm.c')
| -rw-r--r-- | converter/pbm/mgrtopbm.c | 171 |
1 files changed, 86 insertions, 85 deletions
diff --git a/converter/pbm/mgrtopbm.c b/converter/pbm/mgrtopbm.c index cea4be48..9f7004a1 100644 --- a/converter/pbm/mgrtopbm.c +++ b/converter/pbm/mgrtopbm.c @@ -1,13 +1,10 @@ -/* mgrtopbm.c - read a MGR bitmap and produce a portable bitmap -** -** Copyright (C) 1989 by Jef Poskanzer. -** -** Permission to use, copy, modify, and distribute this software and its -** documentation for any purpose and without fee is hereby granted, provided -** that the above copyright notice appear in all copies and that both that -** copyright notice and this permission notice appear in supporting -** documentation. This software is provided "as is" without express or -** implied warranty. +/* mgrtopbm.c - read a MGR bitmap and produce a PBM image. + + Copyright information is at end of file. + + You can find MGR and some MGR format test images at + ftp://sunsite.unc.edu/pub/Linux/apps/MGR/!INDEX.html + */ #include <string.h> @@ -17,29 +14,29 @@ #include "mgr.h" -static unsigned char item; -static int bitsperitem, bitshift; static void -getinit(FILE * const file, - int * const colsP, - int * const rowsP, - int * const depthP, - int * const padrightP, - int * const bitsperitemP) { - +readMgrHeader(FILE * const ifP, + unsigned int * const colsP, + unsigned int * const rowsP, + unsigned int * const depthP, + unsigned int * const padrightP ) { + struct b_header head; - int pad; + unsigned int pad; + size_t bytesRead; - if (fread(&head, sizeof(struct old_b_header), 1, file ) != 1) + bytesRead = fread(&head, sizeof(struct old_b_header), 1, ifP); + if (bytesRead != 1) pm_error("Unable to read 1st byte of file. " "fread() returns errno %d (%s)", errno, strerror(errno)); if (head.magic[0] == 'y' && head.magic[1] == 'z') { /* new style bitmap */ - if (fread(&head.depth, - sizeof(head) - sizeof(struct old_b_header), 1, file) - != 1 ) + size_t bytesRead; + bytesRead = fread(&head.depth, + sizeof(head) - sizeof(struct old_b_header), 1, ifP); + if (bytesRead != 1 ) pm_error("Unable to read header after 1st byte. " "fread() returns errno %d (%s)", errno, strerror(errno)); @@ -60,7 +57,7 @@ getinit(FILE * const file, } else { pm_error("bad magic chars in MGR file: '%c%c'", head.magic[0], head.magic[1] ); - pad = -1; /* should never reach here */ + pad = 0; /* should never reach here */ } if (head.h_wide < ' ' || head.l_wide < ' ') @@ -71,75 +68,79 @@ getinit(FILE * const file, *colsP = (((int)head.h_wide - ' ') << 6) + ((int)head.l_wide - ' '); *rowsP = (((int)head.h_high - ' ') << 6) + ((int) head.l_high - ' '); *padrightP = ( ( *colsP + pad - 1 ) / pad ) * pad - *colsP; - - *bitsperitemP = 8; } -static bit -getbit( file ) - FILE* file; - { - bit b; - - if ( bitsperitem == 8 ) - { - item = getc( file ); - bitsperitem = 0; - bitshift = 7; - } - bitsperitem++; - b = ( ( item >> bitshift) & 1 ) ? PBM_BLACK : PBM_WHITE; - bitshift--; - return b; - } - +int +main(int argc, + char * argv[]) { + + FILE * ifP; + unsigned char * bitrow; + unsigned int rows, cols, depth; + unsigned int padright; + unsigned int row; + unsigned int itemCount; + const char * inputFileName; + + pbm_init(&argc, argv); + + if (argc-1 > 1) + pm_error("Too many arguments (%u). " + "Only argument is optional input file", argc-1); + if (argc-1 == 1) + inputFileName = argv[1]; + else + inputFileName = "-"; + + ifP = pm_openr(inputFileName); + readMgrHeader(ifP, &cols, &rows, &depth, &padright); + if (depth != 1) + pm_error("MGR file has depth of %u, must be 1", depth); -int -main( argc, argv ) - int argc; - char* argv[]; - { - FILE* ifp; - bit* bitrow; - register bit* bP; - int rows, cols, depth, padright, row, col; + pbm_writepbminit(stdout, cols, rows, 0); + bitrow = pbm_allocrow_packed(cols + padright); + + itemCount = (cols + padright ) / 8; + + for (row = 0; row < rows; ++row) { + /* The raster formats are nearly identical. + MGR may have rows padded to 16 or 32 bit boundaries. + */ + size_t bytesRead; + bytesRead = fread(bitrow, 1, itemCount, ifP); + if (bytesRead < itemCount) + pm_error("fread() failed to read mgr bitmap data"); + + pbm_writepbmrow_packed(stdout, bitrow, cols, 0); + } + pm_close(ifP); + pm_close(stdout); + return 0; +} - pbm_init( &argc, argv ); - if ( argc > 2 ) - pm_usage( "[mgrfile]" ); - if ( argc == 2 ) - ifp = pm_openr( argv[1] ); - else - ifp = stdin; - - getinit( ifp, &cols, &rows, &depth, &padright, &bitsperitem ); - if ( depth != 1 ) - pm_error( "MGR file has depth of %d, must be 1", depth ); - - pbm_writepbminit( stdout, cols, rows, 0 ); - bitrow = pbm_allocrow( cols ); - - for ( row = 0; row < rows; row++ ) - { - /* Get data, bit-reversed within each byte. */ - for ( col = 0, bP = bitrow; col < cols; col++, bP++ ) - *bP = getbit( ifp ); - /* Discard line padding */ - for ( col = 0; col < padright; col ++ ) - (void) getbit( ifp ); - pbm_writepbmrow( stdout, bitrow, cols, 0 ); - } - - pm_close( ifp ); - pm_close( stdout ); - - exit( 0 ); - } +/* 2006.10 (afu) + Changed bitrow from plain to raw, read function from getc() to fread(), + write function from pbm_writepbmrow() to pbm_writepbmrow_packed(). + Retired bitwise transformation functions. + + NOT tested for old-style format files. Only one zz file in mgrsrc-0.69 . + +*/ +/* +** Copyright (C) 1989 by Jef Poskanzer. +** +** Permission to use, copy, modify, and distribute this software and its +** documentation for any purpose and without fee is hereby granted, provided +** that the above copyright notice appear in all copies and that both that +** copyright notice and this permission notice appear in supporting +** documentation. This software is provided "as is" without express or +** implied warranty. +*/ |