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#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "razf.h"
#define WINDOW_SIZE 4096
static int razf_main_usage()
{
printf("\n");
printf("Usage: razip [options] [file] ...\n\n");
printf("Options: -c write on standard output, keep original files unchanged\n");
printf(" -d decompress\n");
printf(" -l list compressed file contents\n");
printf(" -b INT decompress at INT position in the uncompressed file\n");
printf(" -s INT decompress INT bytes in the uncompressed file\n");
printf(" -h give this help\n");
printf("\n");
return 0;
}
static int write_open(const char *fn, int is_forced)
{
int fd = -1;
char c;
if (!is_forced) {
if ((fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0666)) < 0 && errno == EEXIST) {
printf("razip: %s already exists; do you wish to overwrite (y or n)? ", fn);
scanf("%c", &c);
if (c != 'Y' && c != 'y') {
printf("razip: not overwritten\n");
exit(1);
}
}
}
if (fd < 0) {
if ((fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC, 0666)) < 0) {
fprintf(stderr, "razip: %s: Fail to write\n", fn);
exit(1);
}
}
return fd;
}
int main(int argc, char **argv)
{
int c, compress, pstdout, is_forced;
RAZF *rz;
void *buffer;
long start, end, size;
compress = 1; pstdout = 0; start = 0; size = -1; end = -1; is_forced = 0;
while((c = getopt(argc, argv, "cdlhfb:s:")) >= 0){
switch(c){
case 'h': return razf_main_usage();
case 'd': compress = 0; break;
case 'c': pstdout = 1; break;
case 'l': compress = 2; break;
case 'b': start = atol(optarg); break;
case 's': size = atol(optarg); break;
case 'f': is_forced = 1; break;
}
}
if (size >= 0) end = start + size;
if(end >= 0 && end < start){
fprintf(stderr, " -- Illegal region: [%ld, %ld] --\n", start, end);
return 1;
}
if(compress == 1){
int f_src, f_dst = -1;
if(argc > optind){
if((f_src = open(argv[optind], O_RDONLY)) < 0){
fprintf(stderr, " -- Cannot open file: %s --\n", argv[optind]);
return 1;
}
if(pstdout){
f_dst = fileno(stdout);
} else {
char *name = malloc(sizeof(strlen(argv[optind]) + 5));
strcpy(name, argv[optind]);
strcat(name, ".rz");
f_dst = write_open(name, is_forced);
if (f_dst < 0) return 1;
free(name);
}
} else if(pstdout){
f_src = fileno(stdin);
f_dst = fileno(stdout);
} else return razf_main_usage();
rz = razf_dopen(f_dst, "w");
buffer = malloc(WINDOW_SIZE);
while((c = read(f_src, buffer, WINDOW_SIZE)) > 0) razf_write(rz, buffer, c);
razf_close(rz); // f_dst will be closed here
if (argc > optind && !pstdout) unlink(argv[optind]);
free(buffer);
close(f_src);
return 0;
} else {
if(argc <= optind) return razf_main_usage();
if(compress == 2){
rz = razf_open(argv[optind], "r");
if(rz->file_type == FILE_TYPE_RZ) {
printf("%20s%20s%7s %s\n", "compressed", "uncompressed", "ratio", "name");
printf("%20lld%20lld%6.1f%% %s\n", (long long)rz->end, (long long)rz->src_end, rz->end * 100.0f / rz->src_end,
argv[optind]);
} else fprintf(stdout, "%s is not a regular rz file\n", argv[optind]);
} else {
int f_dst;
if (argc > optind && !pstdout) {
char *name;
if (strstr(argv[optind], ".rz") - argv[optind] != strlen(argv[optind]) - 3) {
printf("razip: %s: unknown suffix -- ignored\n", argv[optind]);
return 1;
}
name = strdup(argv[optind]);
name[strlen(name) - 3] = '\0';
f_dst = write_open(name, is_forced);
free(name);
} else f_dst = fileno(stdout);
rz = razf_open(argv[optind], "r");
buffer = malloc(WINDOW_SIZE);
razf_seek(rz, start, SEEK_SET);
while(1){
if(end < 0) c = razf_read(rz, buffer, WINDOW_SIZE);
else c = razf_read(rz, buffer, (end - start > WINDOW_SIZE)? WINDOW_SIZE:(end - start));
if(c <= 0) break;
start += c;
write(f_dst, buffer, c);
if(end >= 0 && start >= end) break;
}
free(buffer);
if (!pstdout) unlink(argv[optind]);
}
razf_close(rz);
return 0;
}
}
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