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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) {
fprintf(stderr, "%s: warning: date/time for %s is null, using current date/time\n", self, out_filename);
return;
}
d = dpeek(alf_hdr_date0);
tm.tm_isdst = -1;
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(const char *fname) {
/* up to 12-char FILENAME.EXT, plus a ~, plus null terminator = 14 */
/* has to handle up to 16 chars for -s option: LONGFILE.NAME.ALF */
char backup[20];
strncpy(backup, fname, 19);
strncat(backup, "~", 19);
/* silently ignore errors! */
rename(fname, backup);
}
void open_out_file(const char *fname) {
if(opts.testonly) {
fname = "/dev/null";
} else if(!opts.overwrite) {
make_backup(fname);
}
if(!(out_file = fopen(fname, "wb"))) {
fprintf(stderr, "%s: fatal: ", self);
perror(fname);
exit(1);
}
}
void truncated_err(void);
void write_split_file(void) {
int i, c;
unsigned int len;
char splitname[20];
strncpy(splitname, out_filename, 13);
strncat(splitname, ".ALF", 6);
if(!opts.quiet)
printf("Writing %s\n", splitname);
len = getquad(alf_hdr_compsize0);
open_out_file(splitname);
fwrite(&mem[alf_header], 1, 29, out_file);
for(i = 0; i < len; i++) {
c = fgetc(in_file);
if(c == EOF) {
truncated_err();
}
fputc(c, out_file);
}
fclose(out_file);
}
void extract_alf(void) {
int files_extracted = 0, skip, file_number = 0;
/* get ready to call fake 6502 stuff. set up memory like the Atari. */
dpoke(MEMTOP, 0xbc1f);
while(read_alf_header()) {
file_number++;
skip = 0;
out_filename = (char *)(mem + alf_hdr_filename);
fix_filename();
if(opts.extract_num)
skip = (opts.extract_num != file_number);
else
skip = !file_wanted(out_filename);
if(skip) {
if(!opts.quiet)
printf("Skipping %s\n", 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;
}
files_extracted++;
if(opts.split) {
write_split_file();
continue;
}
if(!opts.quiet) {
printf("%s %s\n", opts.testonly ? "Testing" : "Uncrunching", out_filename);
}
if(opts.extract_to_stdout) {
out_file = stdout;
} else {
open_out_file(out_filename);
}
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");
}
if(!opts.quiet && !files_extracted) {
printf("No files %s!\n", opts.testonly ? "tested" : "extracted");
}
}
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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