source: branches/stable/mindi-busybox/archival/libunarchive/get_header_ar.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 3.6 KB
Line 
1/* Copyright 2001 Glenn McGrath.
2 *
3 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
4 */
5
6#include <stdio.h>
7#include <stdlib.h>
8#include <string.h>
9#include <unistd.h>
10#include "unarchive.h"
11#include "libbb.h"
12
13char get_header_ar(archive_handle_t *archive_handle)
14{
15    file_header_t *typed = archive_handle->file_header;
16    union {
17        char raw[60];
18        struct {
19            char name[16];
20            char date[12];
21            char uid[6];
22            char gid[6];
23            char mode[8];
24            char size[10];
25            char magic[2];
26        } formated;
27    } ar;
28#ifdef CONFIG_FEATURE_AR_LONG_FILENAMES
29    static char *ar_long_names;
30    static unsigned int ar_long_name_size;
31#endif
32
33    /* dont use bb_xread as we want to handle the error ourself */
34    if (read(archive_handle->src_fd, ar.raw, 60) != 60) {
35        /* End Of File */
36        return(EXIT_FAILURE);
37    }
38
39    /* ar header starts on an even byte (2 byte aligned)
40     * '\n' is used for padding
41     */
42    if (ar.raw[0] == '\n') {
43        /* fix up the header, we started reading 1 byte too early */
44        memmove(ar.raw, &ar.raw[1], 59);
45        ar.raw[59] = bb_xread_char(archive_handle->src_fd);
46        archive_handle->offset++;
47    }
48    archive_handle->offset += 60;
49
50    /* align the headers based on the header magic */
51    if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) {
52        bb_error_msg_and_die("Invalid ar header");
53    }
54
55    typed->mode = strtol(ar.formated.mode, NULL, 8);
56    typed->mtime = atoi(ar.formated.date);
57    typed->uid = atoi(ar.formated.uid);
58    typed->gid = atoi(ar.formated.gid);
59    typed->size = atoi(ar.formated.size);
60
61    /* long filenames have '/' as the first character */
62    if (ar.formated.name[0] == '/') {
63#ifdef CONFIG_FEATURE_AR_LONG_FILENAMES
64        if (ar.formated.name[1] == '/') {
65            /* If the second char is a '/' then this entries data section
66             * stores long filename for multiple entries, they are stored
67             * in static variable long_names for use in future entries */
68            ar_long_name_size = typed->size;
69            ar_long_names = xmalloc(ar_long_name_size);
70            bb_xread_all(archive_handle->src_fd, ar_long_names, ar_long_name_size);
71            archive_handle->offset += ar_long_name_size;
72            /* This ar entries data section only contained filenames for other records
73             * they are stored in the static ar_long_names for future reference */
74            return (get_header_ar(archive_handle)); /* Return next header */
75        } else if (ar.formated.name[1] == ' ') {
76            /* This is the index of symbols in the file for compilers */
77            data_skip(archive_handle);
78            archive_handle->offset += typed->size;
79            return (get_header_ar(archive_handle)); /* Return next header */
80        } else {
81            /* The number after the '/' indicates the offset in the ar data section
82            (saved in variable long_name) that conatains the real filename */
83            const unsigned int long_offset = atoi(&ar.formated.name[1]);
84            if (long_offset >= ar_long_name_size) {
85                bb_error_msg_and_die("Cant resolve long filename");
86            }
87            typed->name = bb_xstrdup(ar_long_names + long_offset);
88        }
89#else
90        bb_error_msg_and_die("long filenames not supported");
91#endif
92    } else {
93        /* short filenames */
94           typed->name = bb_xstrndup(ar.formated.name, 16);
95    }
96
97    typed->name[strcspn(typed->name, " /")] = '\0';
98
99    if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
100        archive_handle->action_header(typed);
101        if (archive_handle->sub_archive) {
102            while (archive_handle->action_data_subarchive(archive_handle->sub_archive) == EXIT_SUCCESS);
103        } else {
104            archive_handle->action_data(archive_handle);
105        }
106    } else {
107        data_skip(archive_handle);
108    }
109
110    archive_handle->offset += typed->size;
111    /* Set the file pointer to the correct spot, we may have been reading a compressed file */
112    lseek(archive_handle->src_fd, archive_handle->offset, SEEK_SET);
113
114    return(EXIT_SUCCESS);
115}
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