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-rw-r--r--ar.c277
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diff --git a/ar.c b/ar.c
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+/* vi: set sw=4 ts=4: */
+/*
+ * Mini ar implementation for busybox
+ *
+ * Copyright (C) 2000 by Glenn McGrath
+ * Written by Glenn McGrath <bug1@netconnect.com.au> 1 June 2000
+ *
+ * Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <ctype.h>
+#include "internal.h"
+
+#define AR_BLOCK_SIZE 60
+#define BB_DECLARE_EXTERN
+#define bb_need_io_error
+#include "messages.c"
+
+struct ArHeader { /* Byte Offset */
+ char ar_name[16]; /* 0-15 */
+ char ar_date[12]; /* 16-27 */
+ char ar_uid[6], ar_gid[6]; /* 28-39 */
+ char ar_mode[8]; /* 40-47 */
+ char ar_size[10]; /* 48-57 */
+ char ar_fmag[2]; /* 58-59 */
+};
+typedef struct ArHeader ArHeader;
+
+struct ArInfo {
+ char name[17]; /* File name */
+ time_t date; /* long int, No of seconds since epoch */
+ uid_t uid; /* unsigned int, Numeric UID */
+ gid_t gid; /* unsigned int, Numeric GID */
+ mode_t mode; /* unsigned int, Unix mode */
+ size_t size; /* int, Size of the file */
+};
+typedef struct ArInfo ArInfo;
+
+static const char ar_usage[] = "ar [optxvV] archive [filenames] \n"
+#ifndef BB_FEATURE_TRIVIAL_HELP
+ "\nExtract or list files from an ar archive.\n\n"
+ "Options:\n"
+ "\to\t\tpreserve original dates\n"
+ "\tp\t\textract to stdout\n"
+ "\tt\t\tlist\n"
+ "\tx\t\textract\n"
+ "\tv\t\tverbosely list files processed\n"
+#endif
+ ;
+
+static void displayContents(struct ArInfo *entry, int funct)
+{
+ /* TODO convert mode to string */
+ if ((funct & 2) == 2)
+ printf("%i %i/%i %6i %s ", entry->mode, entry->uid, entry->gid,
+ entry->size, timeString(entry->date));
+ printf("%s\n", entry->name);
+}
+
+/* Converts to new typed struct */
+static int readArHeader(struct ArHeader *rawHeader, struct ArInfo *header)
+{
+ int count2;
+ int count;
+
+ for (count = 0; count < 16; count++) {
+ if (rawHeader->ar_name[count] == ' ') {
+ for (count2 = count; count2 < 16; count2++)
+ if (!isspace(rawHeader->ar_name[count2]))
+ break;
+ if (count2 >= 16)
+ break;
+ }
+ if (rawHeader->ar_name[count] == '/')
+ break;
+ header->name[count] = rawHeader->ar_name[count];
+ }
+ header->name[count] = '\0';
+ header->date = atoi(rawHeader->ar_date);
+ header->uid = atoi(rawHeader->ar_uid);
+ header->gid = atoi(rawHeader->ar_gid);
+ header->mode = atoi(rawHeader->ar_mode);
+ header->size = atoi(rawHeader->ar_size);
+ return (TRUE);
+}
+
+/*
+ * Copy size bytes from current position if srcFd to current position in dstFd
+ * taken from tarExtractRegularFile in tar.c
+ * could be used for ar, tar and copyFile .
+ */
+static int copySubFile(int srcFd, int dstFd, int copySize)
+{
+ int readSize, writeSize, doneSize;
+ char buffer[BUFSIZ];
+
+ while (copySize > 0) {
+ if (copySize > BUFSIZ)
+ readSize = BUFSIZ;
+ else
+ readSize = copySize;
+ writeSize = fullRead(srcFd, buffer, readSize);
+ if (writeSize <= 0) {
+ errorMsg(io_error, "copySubFile :", strerror(errno));
+ return (FALSE);
+ }
+ doneSize = fullWrite(dstFd, buffer, writeSize);
+ if (doneSize <= 0) {
+ errorMsg(io_error, "copySubFile :", strerror(errno));
+ return (FALSE);
+ }
+ copySize -= doneSize;
+ }
+ return (TRUE);
+}
+
+/*
+ * Need to add checks, stat newfile before creation,change mode from 0777
+ * extract to current dir
+ * dstStat.st_size copied from current position of file pointed to by srcFd
+ */
+static int extractToFile(int srcFd, const char *path, const char *name,
+ int size)
+{
+ int dstFd, temp;
+ struct stat tmpStat;
+ char *pathname = NULL;
+
+ if ((temp = isDirectory(path, TRUE, &tmpStat)) != TRUE) {
+ if (!createPath(path, 0777)) {
+ fatalError("Cannot extract to specified path");
+ return (FALSE);
+ }
+ }
+ temp = (strlen(path) + 16);
+ pathname = (char *) xmalloc(temp);
+ pathname = strcpy(pathname, path);
+ pathname = strcat(pathname, &name[0]);
+ dstFd = device_open(pathname, O_WRONLY | O_CREAT);
+ pathname = NULL;
+ temp = copySubFile(srcFd, dstFd, size);
+ close(dstFd);
+ return (TRUE);
+}
+
+/* Step through the ar file entries */
+static int readArFile(char **fileNames, int argc, int funct)
+{
+ int arFd = 0;
+ int pdates = 0;
+ int verbose = 0;
+ int display = 0;
+ int extract = 0;
+ int extToStdout = 0;
+ int status = 0;
+ int found = 0;
+ ArHeader rawArHeader;
+ ArInfo arEntry;
+ char arVersion[8];
+ char *arName;
+ char *selName[argc - 2];
+ int i;
+
+ if ((funct & 1) == 1)
+ pdates = 1;
+ if ((funct & 2) == 2)
+ verbose = 1;
+ if ((funct & 4) == 4)
+ display = 1;
+ if ((funct & 16) == 16) { /* extract to stdout */
+ extract = 1;
+ extToStdout = 1;
+ }
+ if ((funct & 8) == 8) { /* extract to file */
+ extract = 1;
+ }
+ arName = fileNames[2];
+ for (i = 0; i < (argc - 3); i++)
+ selName[i] = fileNames[i + 3];
+ arFd = open(arName, O_RDONLY);
+ if (arFd < 0) {
+ errorMsg("Error opening '%s': %s\n", arName, strerror(errno));
+ return (FALSE);
+ }
+ if (fullRead(arFd, arVersion, 8) <= 0) {
+ errorMsg("ar: Unexpected EOF in archive\n");
+ return (FALSE);
+ }
+ if (strncmp(arVersion, "!<arch>", 7) != 0) {
+ errorMsg("ar header fails check ");
+ return (FALSE);
+ }
+ while ((status = fullRead(arFd, (char *) &rawArHeader, AR_BLOCK_SIZE))
+ == AR_BLOCK_SIZE) {
+ readArHeader(&rawArHeader, &arEntry);
+
+ if (display == 1) {
+ displayContents(&arEntry, funct);
+ }
+ if (argc == 3)
+ found = 1;
+ else {
+ found = 0;
+ for (i = 0; i < (argc - 3); i++) {
+ if ((status = (strcmp(selName[i], arEntry.name))) == 0)
+ found = 1;
+ }
+ }
+ if ((extract == 1) && (found == 1)) {
+ if (extToStdout == 1) {
+ copySubFile(arFd, fileno(stdout), arEntry.size);
+ } else {
+ extractToFile(arFd, "./", arEntry.name, arEntry.size);
+ }
+ } else
+ lseek(arFd, arEntry.size, SEEK_CUR);
+ }
+ return (0);
+}
+
+extern int ar_main(int argc, char **argv)
+{
+ int ret = 0;
+ char *opt_ptr;
+ char c;
+ int funct = 0;
+
+ if (argc < 2)
+ usage(ar_usage);
+
+ opt_ptr = argv[1];
+ if (*opt_ptr == '-')
+ ++opt_ptr;
+ while ((c = *opt_ptr++) != '\0') {
+ switch (c) {
+ case 'o': /* preserver original dates */
+ funct = funct | 1;
+ break;
+ case 'p': /* extract to stdout */
+ funct = funct | 16;
+ break;
+ case 't': /* display contents */
+ funct = funct | 4;
+ break;
+ case 'x': /* extract contents of archive */
+ funct = funct | 8;
+ break;
+ case 'v': /* be verbose */
+ funct = funct | 2;
+ break;
+ default:
+ usage(ar_usage);
+ }
+ }
+ if (funct > 3)
+ ret = readArFile(argv, argc, funct);
+ return (ret);
+}
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