* Mini ar implementation for busybox
*
* Copyright (C) 2000 by Glenn McGrath
- * Written by Glenn McGrath <bug1@netconnect.com.au> 1 June 2000
- *
+ * Written by Glenn McGrath <bug1@optushome.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
* 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);
-}
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <unistd.h>
+#include "busybox.h"
+
+typedef struct ar_headers_s {
+ char *name;
+ size_t size;
+ uid_t uid;
+ gid_t gid;
+ mode_t mode;
+ time_t mtime;
+ off_t offset;
+ struct ar_headers_s *next;
+} ar_headers_t;
/*
- * 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
+ * return the headerL_t struct for the filename descriptor
*/
-static int extractToFile(int srcFd, const char *path, const char *name,
- int size)
+extern ar_headers_t get_ar_headers(int srcFd)
{
- 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);
- }
+ typedef struct raw_ar_header_s { /* Byte Offset */
+ char name[16]; /* 0-15 */
+ char date[12]; /* 16-27 */
+ char uid[6];
+ char gid[6]; /* 28-39 */
+ char mode[8]; /* 40-47 */
+ char size[10]; /* 48-57 */
+ char fmag[2]; /* 58-59 */
+ } raw_ar_header_t;
+
+ raw_ar_header_t raw_ar_header;
+
+ ar_headers_t *head, *entry;
+ char ar_magic[8];
+ char *long_name=NULL;
+
+ head = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));
+ entry = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));
+
+ /* check ar magic */
+ if (full_read(srcFd, ar_magic, 8) != 8) {
+ error_msg_and_die("cannot read magic");
}
- 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;
+ if (strncmp(ar_magic,"!<arch>",7) != 0) {
+ error_msg_and_die("invalid magic");
}
- 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;
+ while (full_read(srcFd, (char *) &raw_ar_header, 60)==60) {
+ /* check the end of header markers are valid */
+ if ((raw_ar_header.fmag[0]!='`') || (raw_ar_header.fmag[1]!='\n')) {
+ char newline;
+ if (raw_ar_header.fmag[1]!='`') {
+ break;
+ }
+ /* some version of ar, have an extra '\n' after each entry */
+ read(srcFd, &newline, 1);
+ if (newline!='\n') {
+ break;
}
+ /* fix up the header, we started reading 1 byte too early due to a '\n' */
+ memmove((char *) &raw_ar_header, (char *)&raw_ar_header+1, 59);
+ /* dont worry about adding the last '\n', we dont need it now */
}
- if ((extract == 1) && (found == 1)) {
- if (extToStdout == 1) {
- copySubFile(arFd, fileno(stdout), arEntry.size);
- } else {
- extractToFile(arFd, "./", arEntry.name, arEntry.size);
+
+ entry->size = (size_t) atoi(raw_ar_header.size);
+ /* long filenames have '/' as the first character */
+ if (raw_ar_header.name[0] == '/') {
+ if (raw_ar_header.name[1] == '/') {
+ /* multiple long filenames are stored as data in one entry */
+ long_name = (char *) xrealloc(long_name, entry->size);
+ full_read(srcFd, long_name, entry->size);
+ continue;
}
- } else
- lseek(arFd, arEntry.size, SEEK_CUR);
+ else {
+ /* The number after the '/' indicates the offset in the ar data section
+ (saved in variable long_name) that conatains the real filename */
+ const int long_name_offset = (int) atoi((char *) &raw_ar_header.name[1]);
+ entry->name = xmalloc(strlen(&long_name[long_name_offset]));
+ strcpy(entry->name, &long_name[long_name_offset]);
+ }
+ }
+ else {
+ /* short filenames */
+ entry->name = xmalloc(16);
+ strncpy(entry->name, raw_ar_header.name, 16);
+ }
+ entry->name[strcspn(entry->name, " /")]='\0';
+
+ /* convert the rest of the now valid char header to its typed struct */
+ parse_mode(raw_ar_header.mode, &entry->mode);
+ entry->mtime = atoi(raw_ar_header.date);
+ entry->uid = atoi(raw_ar_header.uid);
+ entry->gid = atoi(raw_ar_header.gid);
+ entry->offset = lseek(srcFd, 0, SEEK_CUR);
+
+ /* add this entries header to our combined list */
+ entry->next = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));
+ *entry->next = *head;
+ *head = *entry;
+ lseek(srcFd, (off_t) entry->size, SEEK_CUR);
}
- return (0);
+ return(*head);
}
extern int ar_main(int argc, char **argv)
{
- int ret = 0;
- char *opt_ptr;
- char c;
- int funct = 0;
+ const int preserve_date = 1; /* preserve original dates */
+ const int verbose = 2; /* be verbose */
+ const int display = 4; /* display contents */
+ const int extract_to_file = 8; /* extract contents of archive */
+ const int extract_to_stdout = 16; /* extract to stdout */
+
+ int funct = 0, opt=0;
+ int srcFd=0, dstFd=0;
- if (argc < 2)
- usage(ar_usage);
+ ar_headers_t head, *extract_list=NULL;
- opt_ptr = argv[1];
- if (*opt_ptr == '-')
- ++opt_ptr;
- while ((c = *opt_ptr++) != '\0') {
- switch (c) {
- case 'o': /* preserver original dates */
- funct = funct | 1;
+ extract_list = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));
+
+ while ((opt = getopt(argc, argv, "ovtpx")) != -1) {
+ switch (opt) {
+ case 'o':
+ funct |= preserve_date;
break;
- case 'p': /* extract to stdout */
- funct = funct | 16;
+ case 'v':
+ funct |= verbose;
break;
- case 't': /* display contents */
- funct = funct | 4;
+ case 't':
+ funct |= display;
break;
- case 'x': /* extract contents of archive */
- funct = funct | 8;
+ case 'p':
+ funct |= extract_to_stdout;
break;
- case 'v': /* be verbose */
- funct = funct | 2;
+ case 'x':
+ funct |= extract_to_file;
break;
default:
- usage(ar_usage);
+ show_usage();
+ }
+ }
+
+ /* check the src filename was specified */
+ if (optind == argc)
+ show_usage();
+
+ if ( (srcFd = open(argv[optind], O_RDONLY)) < 0)
+ error_msg_and_die("Cannot read %s", argv[optind]);
+
+ optind++;
+ head = get_ar_headers(srcFd);
+
+ /* find files to extract or display */
+ /* search through argv and build extract list */
+ for (;optind<argc; optind++) {
+ ar_headers_t *ar_entry;
+ ar_entry = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));
+ ar_entry = &head;
+ while (ar_entry->next != NULL) {
+ if (strcmp(argv[optind], ar_entry->name) == 0) {
+ ar_headers_t *tmp;
+ tmp = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));
+ *tmp = *extract_list;
+ *extract_list = *ar_entry;
+ extract_list->next = tmp;
+ break;
+ }
+ ar_entry=ar_entry->next;
+ }
+ }
+
+ /* if individual files not found extract all files */
+ if (extract_list->next==NULL) {
+ extract_list = &head;
+ }
+
+ /* find files to extract or display */
+ while (extract_list->next != NULL) {
+ if (funct & extract_to_file) {
+ dstFd = open(extract_list->name, O_WRONLY | O_CREAT, extract_list->mode);
+ }
+ else if (funct & extract_to_stdout) {
+ dstFd = fileno(stdout);
+ }
+ if ((funct & extract_to_file) || (funct & extract_to_stdout)) {
+ lseek(srcFd, extract_list->offset, SEEK_SET);
+ copy_file_chunk(srcFd, dstFd, (size_t) extract_list->size);
+ }
+ if (funct & verbose) {
+ printf("%s %d/%d %8d %s ", mode_string(extract_list->mode),
+ extract_list->uid, extract_list->gid,
+ extract_list->size, time_string(extract_list->mtime));
+ }
+ if ((funct & display) || (funct & verbose)){
+ printf("%s\n", extract_list->name);
}
+ extract_list=extract_list->next;
}
- if (funct > 3)
- ret = readArFile(argv, argc, funct);
- return (ret);
+ return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff