mirror of https://github.com/hsoft/collapseos.git
94 lines
1.9 KiB
C
94 lines
1.9 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include <sys/stat.h>
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#define BLKSIZE 0x100
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#define HEADERSIZE 0x20
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#define MAX_FN_LEN 25 // 26 - null char
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bool ensuredir(char *path)
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{
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char *s = path;
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while (*s != '\0') {
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if (*s == '/') {
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*s = '\0';
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struct stat path_stat;
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if (stat(path, &path_stat) != 0) {
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if (mkdir(path, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH) != 0) {
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return false;
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}
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}
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*s = '/';
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}
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s++;
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}
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return true;
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}
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bool unpackblk(char *dstpath)
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{
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char buf[MAX_FN_LEN+1];
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if (fgets(buf, 3+1, stdin) == NULL) {
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return false;
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}
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if (strcmp(buf, "CFS") != 0) {
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return false;
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}
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int c = getchar();
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uint8_t blkcnt = c;
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if (blkcnt == 0) {
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return false;
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}
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c = getchar();
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uint16_t fsize = c & 0xff;
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c = getchar();
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fsize |= (c & 0xff) << 8;
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if (fgets(buf, MAX_FN_LEN+1+1, stdin) == NULL) {
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return false;
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}
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char fullpath[0x1000];
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strcpy(fullpath, dstpath);
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strcat(fullpath, "/");
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strcat(fullpath, buf);
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if (!ensuredir(fullpath)) {
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return false;
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}
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int blksize = (BLKSIZE-HEADERSIZE)+(BLKSIZE*(blkcnt-1));
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int skipcount = blksize - fsize;
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FILE *fp = fopen(fullpath, "w");
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while (fsize) {
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c = getchar();
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if (c == EOF) {
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return false;
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}
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fputc(c, fp);
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fsize--;
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}
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fclose(fp);
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while (skipcount) {
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getchar();
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skipcount--;
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}
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return true;
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}
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int main(int argc, char *argv[])
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{
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if (argc != 2) {
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fprintf(stderr, "Usage: cfspack /path/to/dest\n");
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return 1;
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}
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char *dstpath = argv[1];
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// we fail if there isn't at least one block
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if (!unpackblk(dstpath)) {
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return 1;
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}
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while (unpackblk(dstpath));
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return 0;
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}
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