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#include "unalf.h"
#include "addrs.h"
#include "sanity.h"
#include <time.h>
#include <utime.h>
int bad_checksum, bad_checksum_count = 0;
int new_file = 0;
unsigned int bytes_written = 0;
char *out_filename;
void dpoke(int addr, u16 value) {
mem[addr] = value & 0xff;
mem[addr + 1] = value >> 8;
}
u16 dpeek(int addr) {
return mem[addr] | (mem[addr + 1] << 8);
}
void fix_filename(void) {
char *p;
if(!out_filename) return;
if(strlen(out_filename) > 12) {
fprintf(stderr, "%s: filename in ALF header not null-terminated, fixing.\n", self);
out_filename[12] = '\0';
}
sanity_check_filename(out_filename);
if(opts.lowercase) {
for(p = out_filename; *p; p++)
*p = tolower(*p);
}
if(!opts.keepdot) {
for(p = out_filename; *p; p++)
if(p[0] == '.' && !p[1])
*p = '\0';
}
}
void set_datetime() {
u16 t, d;
struct tm tm;
time_t time;
struct utimbuf utb;
t = dpeek(alf_hdr_time0);
/* don't set the date/time at all, if it's zero */
if(!t) return;
d = dpeek(alf_hdr_date0);
tm.tm_sec = (t & 0x1f) << 1;
tm.tm_hour = t >> 11;
if(tm.tm_hour == 24) tm.tm_hour = 0;
tm.tm_min = (t >> 5) & 0x3f;
tm.tm_year = (d >> 9) + 1980 - 1900;
tm.tm_mon = ((d >> 5) & 0x0f) - 1;
tm.tm_mday = (d & 0x1f);
time = mktime(&tm);
if(time != (time_t) -1) {
utb.actime = utb.modtime = time;
utime(out_filename, &utb); /* ignore errors */
}
}
void make_backup(void) {
/* up to 12-char FILENAME.EXT, plus a ~, plus null terminator = 14 */
char backup[14];
strncpy(backup, out_filename, 13);
strncat(backup, "~", 13);
/* silently ignore errors! */
rename(out_filename, backup);
}
void extract_alf(void) {
/* get ready to call fake 6502 stuff. set up memory like the Atari. */
dpoke(MEMTOP, 0xbc1f);
while(read_alf_header()) {
out_filename = (char *)(mem + alf_hdr_filename);
fix_filename();
if(!file_wanted(out_filename)) {
if(fseek(in_file, getquad(alf_hdr_compsize0), SEEK_CUR) != 0) {
fprintf(stderr, "%s: fatal: seek failed on input!\n", self);
exit(1);
}
out_filename = 0;
continue;
}
if(!opts.quiet) {
printf("%s %s\n", opts.testonly ? "Testing" : "Uncrunching", out_filename);
}
if(opts.extract_to_stdout) {
out_file = stdout;
} else {
char *realname = out_filename;
if(opts.testonly) {
out_filename = "/dev/null";
} else if(!opts.overwrite) {
make_backup();
}
if(!(out_file = fopen(out_filename, "wb"))) {
fprintf(stderr, "%s: fatal: ", self);
perror(out_filename);
exit(1);
}
out_filename = realname;
}
bad_checksum = bytes_written = 0;
new_file = 1;
uncrunch_file();
if(bad_checksum) bad_checksum_count++;
if(bytes_written != getquad(alf_hdr_origsize0))
fprintf(stderr, "%s: %s should be %u bytes, but extracted to %u.\n",
self, out_filename, getquad(alf_hdr_origsize0), bytes_written);
if(!opts.extract_to_stdout) {
fclose(out_file);
if(!opts.ignore_datetime)
set_datetime();
}
out_filename = 0;
}
if(opts.testonly && !opts.quiet) {
if(bad_checksum_count)
printf("%d file%s with bad checksum!\n",
bad_checksum_count,
bad_checksum_count == 1 ? "" : "s");
else
printf("All files OK.\n");
}
}
void chksum_err(void) {
bad_checksum = 1;
fprintf(stderr, "%s: checksum error on %s\n", self, out_filename);
}
void truncated_err(void){
fprintf(stderr, "%s: fatal: compressed data is truncated, EOF before end marker\n", self);
exit(1);
}
void stack_underrun(void){
fprintf(stderr, "%s: fatal: stack underrun\n", self);
exit(1);
}
void stack_overrun(void){
fprintf(stderr, "%s: fatal: stack overrun\n", self);
exit(1);
}
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