Tar Loader

-=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- (c) WidthPadding Industries 1987 0\|471\|0 -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=-
SoCoder -> Snippet Home -> File Access

cthug	Created : 25 July 2009 Edited : 26 July 2009 System : Cross Platform Language : Monkey Tar Loader A full feature tar loader
A simple tar archive, loader, handles both orginal and USTAR formats. /* * Copyright 2009 Zachary Scott <cthug.zs@gmail.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301, USA. / // include #include <string.h> // TAR Header format typedef union { char buffer[512]; struct TARHeader { char filename[100]; char mode[8]; char uid[8]; char gid[8]; char size[12]; char mtime[12]; char chksum[8]; char linkname[100]; char spacing[256]; } TAR; struct USTARHeader { char filename[100]; char mode[8]; char uid[8]; char gid[8]; char size[12]; char mtime[12]; char chksum[8]; char typeflag; char linkname[100]; char magic[6]; char version[2]; char uname[32]; char gname[32]; char devmajor[8]; char devminor[8]; char prefix[155]; char spacing[12]; } USTAR; } tarHeader; // type flags #define TFLAG_reg 0 #define TFLAG_link 1 #define TFLAG_symlink 2 #define TFLAG_cspdev 3 #define TFLAG_bspdev 4 #define TFLAG_dir 5 #define TFLAG_fifo 6 #define TFLAG_reserved 7 / * power: returns x to the power of y / int power(int x, int y) { int p=1, n; for (n=1;n<y;n++) { p=px; } return p; } /* * oct: Returns the octal value of a string / int oct(char str) { int size, n, num; for (n=1;n<strlen(str);n++) { num=(str[n]-48); if (num > 7 \|\| num < 0) return -1; // error octal (base 8) can't be higher than 7 size+=(numpower(8, strlen(str)-n)); } return size; } / * getTar: Returns the file specified by filename, in * buffer / char getTar(char filename, char buffer, int len) { char temp; int n, c=0, size, type=0; tarHeader header; temp=(char )malloc(512sizeof(char)); do { // read header for (n=0;n<512;n++) { if ((n+(c512)) >= len) { temp=NULL; return temp; } temp[n]=buffer[n+(c512)]; } c++; if (strcmp(header.USTAR.magic, "\0USTAR") == 0) { type=1; } else { type=0; } } while (strcmp(header.TAR.filename, filename) != 0); // read into temp temp=(char )malloc(lensizeof(char)); if (type) { size=oct(header.USTAR.size); } else { size=oct(header.TAR.size); } for (n=0;n<size;n++) { temp[n]=buffer[n+(512c)]; } return temp; } // EOF --v

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