seewbmp.c File Reference

#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>

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Data Structures
struct	parm
Functions
long	get_mbi (FILE *infile)
int	skip_mbi (FILE *infile)
int	show_image_from_file (char *bmpname, FILE *bmpfile, long width, long height)
void	clear_extparms (void)
int	new_extparm (char *name, char *value)
void	print_extparms (FILE *outfile)
int	parse_headers (FILE *bmpfile)
int	show_wbmp_from_file (char *bmpname, FILE *bmpfile)
int	main (int argc, char *argv[])
Variables
parm *	extparms = NULL

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Function Documentation

void clear_extparms (  void   )  [static]

Definition at line 162 of file seewbmp.c. References extparms, free, parm::name, parm::next, and parm::value. Referenced by parse_headers(). { while (extparms) { struct parm *tmp = extparms; extparms = extparms->next; free(tmp->name); free(tmp->value); free(tmp); } }

long get_mbi (  FILE *  infile  )  [static]

Definition at line 98 of file seewbmp.c. References result. Referenced by show_wbmp_from_file(). { int c; long result = 0; do { c = getc(infile); if (c < 0) return -1; result = (result << 7) | (c & 0x7f); } while (c & 0x80); return result; }

int main (  int  argc, char *  argv[] )

Definition at line 304 of file seewbmp.c. References show_wbmp_from_file(). { int i; /* 1 means an I/O error. No other error values are used yet. */ int exitvalue = 0; if (argc > 1) { for (i = 1; i < argc; i++) { FILE *bmpfile; bmpfile = fopen(argv[i], "r"); if (bmpfile) { if (show_wbmp_from_file(argv[i], bmpfile) < 0) { /* We've already reported the error */ exitvalue = 1; } if (fclose(bmpfile) < 0) { perror(argv[i]); exitvalue = 1; } } else { perror(argv[i]); exitvalue = 1; } if (i < argc - 1) { /* more files follow -- separate them */ printf("\n"); } } } else { /* No files specified -- read from standard input */ if (show_wbmp_from_file("stdin", stdin)) { exitvalue = 1; } } return exitvalue; }

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int new_extparm (  char *  name, char *  value )  [static]

Definition at line 174 of file seewbmp.c. References extparms, malloc, parm::name, parm::next, and parm::value. Referenced by parse_headers(). { struct parm *new; struct parm *p; /* Construct a new node */ new = (struct parm *)malloc(sizeof(struct parm)); if (!new) return -1; new->name = name; new->value = value; new->next = NULL; /* Add it to the end of the list. */ if (!extparms) { extparms = new; } else { p = extparms; while (p->next) { p = p->next; } p->next = new; } return 0; }

int parse_headers (  FILE *  bmpfile  )  [static]

Definition at line 209 of file seewbmp.c. References clear_extparms(), free, malloc, name, new_extparm(), and skip_mbi(). Referenced by show_wbmp_from_file(). { int c; int exttype; clear_extparms(); c = getc(bmpfile); if (c < 0) return -1; if (!(c & 0x80)) { /* No extension headers follow */ return 0; } exttype = (c >> 5) & 0x03; /* None of these headers do much at this time, but they * might be meaningful with later specifications */ switch (exttype) { case 0: /* All we know of type 0 headers is that * the high bit is a continuation bit. * That makes them exactly like an MBI. */ if (skip_mbi(bmpfile) < 0) return -1; break; case 1: case 2: /* We don't know what to do with these */ return -1; case 3: /* A sequence of parameter/value combinations */ do { int namelen, valuelen; char *name, *value; c = getc(bmpfile); if (c < 0) return -1; namelen = (c >> 4) & 0x07; name = malloc(namelen + 1); if (!name) return -1; if (fread(name, namelen, 1, bmpfile) < (size_t) namelen) return -1; valuelen = c & 0x0f; value = malloc(valuelen + 1); if (!value) { free(name); return -1; } if (fread(value, valuelen, 1, bmpfile) < (size_t) valuelen) return -1; new_extparm(name, value); } while (c & 0x80); break; } return 0; }

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void print_extparms (  FILE *  outfile  )  [static]

Definition at line 201 of file seewbmp.c. References parm::name, parm::next, and parm::value. Referenced by show_wbmp_from_file(). { struct parm *p; for (p = extparms; p; p = p->next) { fprintf(outfile, "%s=%s\n", p->name, p->value); } }

int show_image_from_file (  char *  bmpname, FILE *  bmpfile, long  width, long  height )  [static]

Definition at line 126 of file seewbmp.c. Referenced by show_wbmp_from_file(). { long w, h; for (h = 0; h < height; h++) { /* w is incremented in its inner loop */ for (w = 0; w < width; ) { int c; unsigned int bit; c = getc(bmpfile); if (c < 0) { perror(bmpname); return -1; } for (bit = 0x80; bit > 0 && w < width; bit >>= 1, w++) { putc((c & bit) ? '*' : ' ', stdout); } } putc('\n', stdout); } return 0; }

int show_wbmp_from_file (  char *  bmpname, FILE *  bmpfile )  [static]

Definition at line 262 of file seewbmp.c. References get_mbi(), parse_headers(), print_extparms(), and show_image_from_file(). Referenced by main(). { long typefield; long width, height; typefield = get_mbi(bmpfile); if (typefield < 0) { perror(bmpname); return -1; } if (parse_headers(bmpfile) < 0) { fprintf(stderr, "%s: format error in headers\n", bmpname); return -1; } width = get_mbi(bmpfile); height = get_mbi(bmpfile); if (width < 0 || height < 0) { fprintf(stderr, "%s: error reading height and width\n", bmpname); return -1; } switch (typefield) { case 0: printf("%s, %ldx%ld B/W bitmap, no compression\n", bmpname, width, height); print_extparms(stdout); if (show_image_from_file(bmpname, bmpfile, width, height) < 0) { return -1; } break; default: fprintf(stderr, "%s: cannot handle level %ld wbmp\n", bmpname, typefield); return -1; } return 0; }

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int skip_mbi (  FILE *  infile  )  [static]

Definition at line 115 of file seewbmp.c. Referenced by parse_headers(). { int c; do { c = getc(infile); if (c < 0) return -1; } while (c & 0x80); return 0; }

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Variable Documentation

struct parm* extparms = NULL

Definition at line 160 of file seewbmp.c. Referenced by clear_extparms(), and new_extparm().

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