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#include "unalf.h"
#include "addrs.h"
#include "sanity.h"
static const char *monthnames[] = {
"???",
"Jan", "Feb", "Mar", "Apr",
"May", "Jun", "Jul", "Aug",
"Sep", "Oct", "Nov", "Dec",
"???", "???", "???",
};
u16 getword(int offs) {
return mem[offs] | (mem[offs + 1] << 8);
}
unsigned int getquad(int offs) {
return getword(offs) | ((getword(offs + 2) << 16));
}
/* see Arcinfo for details */
void format_msdos_time(char *buf) {
u16 t, hour, min, sec;
char ampm;
t = getword(alf_hdr_time0);
sec = (t & 0x1f) << 1;
hour = t >> 11;
min = (t >> 5) & 0x3f;
/* midnight is 12:00a (unlike arc, which uses 0:00a). noon
is 12:00p (same as arc). could just use a 24h clock like
unzip does, but AM/PM are more intuitive to me. */
ampm = (hour > 11 ? 'p' : 'a');
hour %= 12;
/* midnight and noon print as 12, not 0 */
if(hour == 0) hour = 12;
snprintf(buf, 10, "%2d:%02d:%02d%c", hour, min, sec, ampm);
}
/* see Arcinfo for details */
void format_msdos_date(char *buf) {
u16 d, year, month, day;
d = getword(alf_hdr_date0);
/* year actually ranges 1980 to 2107... */
year = (d >> 9) + 1980;
/* valid months range 1 to 12 */
month = (d >> 5) & 0x0f;
/* valid day range is 1 to 31. 0 is invalid. */
day = d & 0x1f;
if(day == 0 || month == 0 || month > 12)
snprintf(buf, 12, "%11s", "<none>");
else
snprintf(buf, 12, "%2d %3s %04d", day, monthnames[month], year);
}
/* small files may be "compressed" larger than the original, so this
has to return a signed type. */
static int comp_percent(unsigned int orig, unsigned int comp) {
if(orig == 0) return 0; /* no division by zero please */
return 100 - (int)((float)comp / (float)orig * 100.0);
}
/* output similar to "arc v", except we omit the compression type column
since there's only one type. also, don't call the checksum a CRC, it
isn't. */
void list_alf(void) {
unsigned int c = 0, orig_size, comp_size, total_osize = 0, total_csize = 0;
char buf[100];
extern char *out_filename;
while(read_alf_header()) {
c++;
if(opts.verbose_list && c == 1) {
puts("Name Size was Size now Comp Date Time CkSum");
puts("============ ======== ======== ==== =========== ========= =====");
}
orig_size = getquad(alf_hdr_origsize0);
comp_size = getquad(alf_hdr_compsize0);
out_filename = (char *)(mem + alf_hdr_filename);
if(opts.verbose_list)
sanity_check_filename(out_filename);
else
fix_filename();
total_osize += orig_size;
total_csize += comp_size;
if(opts.verbose_list) {
printf("%-12s ", out_filename);
printf("%8d ", orig_size);
printf("%8d ", comp_size);
printf("%3d%% ", comp_percent(orig_size, comp_size));
format_msdos_date(buf);
printf("%9s ", buf);
format_msdos_time(buf);
printf("%6s ", buf);
printf(" %04x", getword(alf_hdr_cksum_l));
putchar('\n');
} else {
if(file_wanted(out_filename))
printf("%s\n", out_filename);
}
if(fseek(in_file, comp_size, SEEK_CUR) != 0) {
fprintf(stderr, "%s: fatal: seek failed on input!\n", self);
exit(1);
}
}
if(opts.verbose_list) {
fputs(" ==== ======== ======== ====\nTotal ", stdout);
printf("%4d ", c);
printf("%8d ", total_osize);
printf("%8d ", total_csize);
printf("%3d%% ", comp_percent(total_osize, total_csize));
putchar('\n');
}
}
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