675 lines
16 KiB
C
675 lines
16 KiB
C
/*
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* untgz.c -- Display contents and extract files from a gzip'd TAR file
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*
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* written by Pedro A. Aranda Gutierrez <paag@tid.es>
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* adaptation to Unix by Jean-loup Gailly <jloup@gzip.org>
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* various fixes by Cosmin Truta <cosmint@cs.ubbcluj.ro>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <errno.h>
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#include "zlib.h"
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#ifdef unix
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# include <unistd.h>
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#else
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# include <direct.h>
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# include <io.h>
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#endif
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#ifdef WIN32
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#include <windows.h>
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# ifndef F_OK
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# define F_OK 0
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# endif
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# define mkdir(dirname,mode) _mkdir(dirname)
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# ifdef _MSC_VER
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# define access(path,mode) _access(path,mode)
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# define chmod(path,mode) _chmod(path,mode)
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# define strdup(str) _strdup(str)
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# endif
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#else
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# include <utime.h>
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#endif
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/* values used in typeflag field */
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#define REGTYPE '0' /* regular file */
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#define AREGTYPE '\0' /* regular file */
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#define LNKTYPE '1' /* link */
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#define SYMTYPE '2' /* reserved */
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#define CHRTYPE '3' /* character special */
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#define BLKTYPE '4' /* block special */
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#define DIRTYPE '5' /* directory */
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#define FIFOTYPE '6' /* FIFO special */
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#define CONTTYPE '7' /* reserved */
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/* GNU tar extensions */
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#define GNUTYPE_DUMPDIR 'D' /* file names from dumped directory */
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#define GNUTYPE_LONGLINK 'K' /* long link name */
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#define GNUTYPE_LONGNAME 'L' /* long file name */
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#define GNUTYPE_MULTIVOL 'M' /* continuation of file from another volume */
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#define GNUTYPE_NAMES 'N' /* file name that does not fit into main hdr */
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#define GNUTYPE_SPARSE 'S' /* sparse file */
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#define GNUTYPE_VOLHDR 'V' /* tape/volume header */
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/* tar header */
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#define BLOCKSIZE 512
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#define SHORTNAMESIZE 100
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struct tar_header
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{ /* byte offset */
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char name[100]; /* 0 */
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char mode[8]; /* 100 */
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char uid[8]; /* 108 */
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char gid[8]; /* 116 */
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char size[12]; /* 124 */
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char mtime[12]; /* 136 */
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char chksum[8]; /* 148 */
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char typeflag; /* 156 */
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char linkname[100]; /* 157 */
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char magic[6]; /* 257 */
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char version[2]; /* 263 */
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char uname[32]; /* 265 */
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char gname[32]; /* 297 */
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char devmajor[8]; /* 329 */
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char devminor[8]; /* 337 */
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char prefix[155]; /* 345 */
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/* 500 */
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};
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union tar_buffer
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{
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char buffer[BLOCKSIZE];
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struct tar_header header;
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};
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struct attr_item
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{
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struct attr_item *next;
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char *fname;
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int mode;
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time_t time;
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};
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enum { TGZ_EXTRACT, TGZ_LIST, TGZ_INVALID };
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char *TGZfname OF((const char *));
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void TGZnotfound OF((const char *));
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int getoct OF((char *, int));
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char *strtime OF((time_t *));
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int setfiletime OF((char *, time_t));
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void push_attr OF((struct attr_item **, char *, int, time_t));
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void restore_attr OF((struct attr_item **));
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int ExprMatch OF((char *, char *));
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int makedir OF((char *));
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int matchname OF((int, int, char **, char *));
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void error OF((const char *));
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int tar OF((gzFile, int, int, int, char **));
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void help OF((int));
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int main OF((int, char **));
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char *prog;
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const char *TGZsuffix[] = { "\0", ".tar", ".tar.gz", ".taz", ".tgz", NULL };
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/* return the file name of the TGZ archive */
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/* or NULL if it does not exist */
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char *TGZfname (const char *arcname)
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{
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static char buffer[1024];
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int origlen,i;
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strcpy(buffer,arcname);
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origlen = strlen(buffer);
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for (i=0; TGZsuffix[i]; i++)
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{
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strcpy(buffer+origlen,TGZsuffix[i]);
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if (access(buffer,F_OK) == 0)
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return buffer;
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}
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return NULL;
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}
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/* error message for the filename */
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void TGZnotfound (const char *arcname)
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{
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int i;
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fprintf(stderr,"%s: Couldn't find ",prog);
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for (i=0;TGZsuffix[i];i++)
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fprintf(stderr,(TGZsuffix[i+1]) ? "%s%s, " : "or %s%s\n",
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arcname,
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TGZsuffix[i]);
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exit(1);
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}
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/* convert octal digits to int */
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/* on error return -1 */
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int getoct (char *p,int width)
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{
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int result = 0;
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char c;
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while (width--)
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{
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c = *p++;
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if (c == 0)
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break;
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if (c == ' ')
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continue;
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if (c < '0' || c > '7')
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return -1;
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result = result * 8 + (c - '0');
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}
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return result;
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}
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/* convert time_t to string */
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/* use the "YYYY/MM/DD hh:mm:ss" format */
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char *strtime (time_t *t)
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{
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struct tm *local;
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static char result[32];
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local = localtime(t);
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sprintf(result,"%4d/%02d/%02d %02d:%02d:%02d",
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local->tm_year+1900, local->tm_mon+1, local->tm_mday,
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local->tm_hour, local->tm_min, local->tm_sec);
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return result;
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}
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/* set file time */
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int setfiletime (char *fname,time_t ftime)
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{
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#ifdef WIN32
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static int isWinNT = -1;
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SYSTEMTIME st;
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FILETIME locft, modft;
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struct tm *loctm;
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HANDLE hFile;
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int result;
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loctm = localtime(&ftime);
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if (loctm == NULL)
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return -1;
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st.wYear = (WORD)loctm->tm_year + 1900;
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st.wMonth = (WORD)loctm->tm_mon + 1;
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st.wDayOfWeek = (WORD)loctm->tm_wday;
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st.wDay = (WORD)loctm->tm_mday;
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st.wHour = (WORD)loctm->tm_hour;
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st.wMinute = (WORD)loctm->tm_min;
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st.wSecond = (WORD)loctm->tm_sec;
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st.wMilliseconds = 0;
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if (!SystemTimeToFileTime(&st, &locft) ||
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!LocalFileTimeToFileTime(&locft, &modft))
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return -1;
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if (isWinNT < 0)
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isWinNT = (GetVersion() < 0x80000000) ? 1 : 0;
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hFile = CreateFile(fname, GENERIC_WRITE, 0, NULL, OPEN_EXISTING,
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(isWinNT ? FILE_FLAG_BACKUP_SEMANTICS : 0),
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NULL);
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if (hFile == INVALID_HANDLE_VALUE)
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return -1;
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result = SetFileTime(hFile, NULL, NULL, &modft) ? 0 : -1;
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CloseHandle(hFile);
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return result;
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#else
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struct utimbuf settime;
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settime.actime = settime.modtime = ftime;
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return utime(fname,&settime);
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#endif
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}
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/* push file attributes */
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void push_attr(struct attr_item **list,char *fname,int mode,time_t time)
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{
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struct attr_item *item;
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item = (struct attr_item *)malloc(sizeof(struct attr_item));
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if (item == NULL)
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error("Out of memory");
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item->fname = strdup(fname);
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item->mode = mode;
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item->time = time;
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item->next = *list;
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*list = item;
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}
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/* restore file attributes */
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void restore_attr(struct attr_item **list)
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{
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struct attr_item *item, *prev;
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for (item = *list; item != NULL; )
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{
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setfiletime(item->fname,item->time);
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chmod(item->fname,item->mode);
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prev = item;
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item = item->next;
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free(prev);
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}
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*list = NULL;
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}
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/* match regular expression */
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#define ISSPECIAL(c) (((c) == '*') || ((c) == '/'))
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int ExprMatch (char *string,char *expr)
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{
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while (1)
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{
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if (ISSPECIAL(*expr))
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{
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if (*expr == '/')
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{
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if (*string != '\\' && *string != '/')
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return 0;
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string ++; expr++;
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}
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else if (*expr == '*')
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{
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if (*expr ++ == 0)
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return 1;
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while (*++string != *expr)
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if (*string == 0)
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return 0;
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}
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}
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else
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{
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if (*string != *expr)
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return 0;
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if (*expr++ == 0)
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return 1;
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string++;
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}
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}
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}
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/* recursive mkdir */
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/* abort on ENOENT; ignore other errors like "directory already exists" */
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/* return 1 if OK */
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/* 0 on error */
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int makedir (char *newdir)
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{
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char *buffer = strdup(newdir);
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char *p;
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int len = strlen(buffer);
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if (len <= 0) {
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free(buffer);
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return 0;
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}
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if (buffer[len-1] == '/') {
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buffer[len-1] = '\0';
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}
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if (mkdir(buffer, 0755) == 0)
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{
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free(buffer);
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return 1;
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}
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p = buffer+1;
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while (1)
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{
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char hold;
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while(*p && *p != '\\' && *p != '/')
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p++;
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hold = *p;
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*p = 0;
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if ((mkdir(buffer, 0755) == -1) && (errno == ENOENT))
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{
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fprintf(stderr,"%s: Couldn't create directory %s\n",prog,buffer);
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free(buffer);
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return 0;
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}
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if (hold == 0)
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break;
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*p++ = hold;
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}
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free(buffer);
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return 1;
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}
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int matchname (int arg,int argc,char **argv,char *fname)
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{
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if (arg == argc) /* no arguments given (untgz tgzarchive) */
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return 1;
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while (arg < argc)
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if (ExprMatch(fname,argv[arg++]))
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return 1;
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return 0; /* ignore this for the moment being */
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}
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/* tar file list or extract */
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int tar (gzFile in,int action,int arg,int argc,char **argv)
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{
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union tar_buffer buffer;
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int len;
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int err;
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int getheader = 1;
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int remaining = 0;
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FILE *outfile = NULL;
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char fname[BLOCKSIZE];
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int tarmode;
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time_t tartime;
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struct attr_item *attributes = NULL;
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if (action == TGZ_LIST)
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printf(" date time size file\n"
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" ---------- -------- --------- -------------------------------------\n");
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while (1)
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{
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len = gzread(in, &buffer, BLOCKSIZE);
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if (len < 0)
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error(gzerror(in, &err));
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/*
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* Always expect complete blocks to process
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* the tar information.
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*/
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if (len != BLOCKSIZE)
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{
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action = TGZ_INVALID; /* force error exit */
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remaining = 0; /* force I/O cleanup */
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}
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/*
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* If we have to get a tar header
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*/
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if (getheader >= 1)
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{
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/*
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* if we met the end of the tar
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* or the end-of-tar block,
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* we are done
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*/
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if (len == 0 || buffer.header.name[0] == 0)
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break;
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tarmode = getoct(buffer.header.mode,8);
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tartime = (time_t)getoct(buffer.header.mtime,12);
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if (tarmode == -1 || tartime == (time_t)-1)
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{
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buffer.header.name[0] = 0;
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action = TGZ_INVALID;
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}
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if (getheader == 1)
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{
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strncpy(fname,buffer.header.name,SHORTNAMESIZE);
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if (fname[SHORTNAMESIZE-1] != 0)
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fname[SHORTNAMESIZE] = 0;
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}
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else
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{
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/*
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* The file name is longer than SHORTNAMESIZE
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*/
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if (strncmp(fname,buffer.header.name,SHORTNAMESIZE-1) != 0)
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error("bad long name");
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getheader = 1;
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}
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/*
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* Act according to the type flag
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*/
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switch (buffer.header.typeflag)
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{
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case DIRTYPE:
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if (action == TGZ_LIST)
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printf(" %s <dir> %s\n",strtime(&tartime),fname);
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if (action == TGZ_EXTRACT)
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{
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makedir(fname);
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push_attr(&attributes,fname,tarmode,tartime);
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}
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break;
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case REGTYPE:
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case AREGTYPE:
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remaining = getoct(buffer.header.size,12);
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if (remaining == -1)
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{
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action = TGZ_INVALID;
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break;
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}
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if (action == TGZ_LIST)
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printf(" %s %9d %s\n",strtime(&tartime),remaining,fname);
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else if (action == TGZ_EXTRACT)
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{
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if (matchname(arg,argc,argv,fname))
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{
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outfile = fopen(fname,"wb");
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if (outfile == NULL) {
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/* try creating directory */
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char *p = strrchr(fname, '/');
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if (p != NULL) {
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*p = '\0';
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makedir(fname);
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*p = '/';
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outfile = fopen(fname,"wb");
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}
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}
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if (outfile != NULL)
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printf("Extracting %s\n",fname);
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else
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fprintf(stderr, "%s: Couldn't create %s",prog,fname);
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}
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else
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outfile = NULL;
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}
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getheader = 0;
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break;
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case GNUTYPE_LONGLINK:
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case GNUTYPE_LONGNAME:
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remaining = getoct(buffer.header.size,12);
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if (remaining < 0 || remaining >= BLOCKSIZE)
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{
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action = TGZ_INVALID;
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break;
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}
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len = gzread(in, fname, BLOCKSIZE);
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if (len < 0)
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error(gzerror(in, &err));
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if (fname[BLOCKSIZE-1] != 0 || (int)strlen(fname) > remaining)
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{
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action = TGZ_INVALID;
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break;
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}
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getheader = 2;
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break;
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default:
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if (action == TGZ_LIST)
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printf(" %s <---> %s\n",strtime(&tartime),fname);
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break;
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}
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}
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else
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{
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unsigned int bytes = (remaining > BLOCKSIZE) ? BLOCKSIZE : remaining;
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if (outfile != NULL)
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{
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if (fwrite(&buffer,sizeof(char),bytes,outfile) != bytes)
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{
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fprintf(stderr,
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"%s: Error writing %s -- skipping\n",prog,fname);
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fclose(outfile);
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outfile = NULL;
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remove(fname);
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}
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}
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remaining -= bytes;
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}
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if (remaining == 0)
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{
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getheader = 1;
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if (outfile != NULL)
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{
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fclose(outfile);
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outfile = NULL;
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if (action != TGZ_INVALID)
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push_attr(&attributes,fname,tarmode,tartime);
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}
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}
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/*
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* Abandon if errors are found
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*/
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if (action == TGZ_INVALID)
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{
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error("broken archive");
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break;
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}
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}
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/*
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* Restore file modes and time stamps
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*/
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restore_attr(&attributes);
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if (gzclose(in) != Z_OK)
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error("failed gzclose");
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return 0;
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}
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/* ============================================================ */
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void help(int exitval)
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{
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printf("untgz version 0.2.1\n"
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" using zlib version %s\n\n",
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zlibVersion());
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printf("Usage: untgz file.tgz extract all files\n"
|
|
" untgz file.tgz fname ... extract selected files\n"
|
|
" untgz -l file.tgz list archive contents\n"
|
|
" untgz -h display this help\n");
|
|
exit(exitval);
|
|
}
|
|
|
|
void error(const char *msg)
|
|
{
|
|
fprintf(stderr, "%s: %s\n", prog, msg);
|
|
exit(1);
|
|
}
|
|
|
|
|
|
/* ============================================================ */
|
|
|
|
#if defined(WIN32) && defined(__GNUC__)
|
|
int _CRT_glob = 0; /* disable argument globbing in MinGW */
|
|
#endif
|
|
|
|
int main(int argc,char **argv)
|
|
{
|
|
int action = TGZ_EXTRACT;
|
|
int arg = 1;
|
|
char *TGZfile;
|
|
gzFile *f;
|
|
|
|
prog = strrchr(argv[0],'\\');
|
|
if (prog == NULL)
|
|
{
|
|
prog = strrchr(argv[0],'/');
|
|
if (prog == NULL)
|
|
{
|
|
prog = strrchr(argv[0],':');
|
|
if (prog == NULL)
|
|
prog = argv[0];
|
|
else
|
|
prog++;
|
|
}
|
|
else
|
|
prog++;
|
|
}
|
|
else
|
|
prog++;
|
|
|
|
if (argc == 1)
|
|
help(0);
|
|
|
|
if (strcmp(argv[arg],"-l") == 0)
|
|
{
|
|
action = TGZ_LIST;
|
|
if (argc == ++arg)
|
|
help(0);
|
|
}
|
|
else if (strcmp(argv[arg],"-h") == 0)
|
|
{
|
|
help(0);
|
|
}
|
|
|
|
if ((TGZfile = TGZfname(argv[arg])) == NULL)
|
|
TGZnotfound(argv[arg]);
|
|
|
|
++arg;
|
|
if ((action == TGZ_LIST) && (arg != argc))
|
|
help(1);
|
|
|
|
/*
|
|
* Process the TGZ file
|
|
*/
|
|
switch(action)
|
|
{
|
|
case TGZ_LIST:
|
|
case TGZ_EXTRACT:
|
|
f = gzopen(TGZfile,"rb");
|
|
if (f == NULL)
|
|
{
|
|
fprintf(stderr,"%s: Couldn't gzopen %s\n",prog,TGZfile);
|
|
return 1;
|
|
}
|
|
exit(tar(f, action, arg, argc, argv));
|
|
break;
|
|
|
|
default:
|
|
error("Unknown option");
|
|
exit(1);
|
|
}
|
|
|
|
return 0;
|
|
}
|