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    Annotation of /trunk/mkinitrd-magellan/busybox/archival/libunarchive/get_header_ar.c

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    Revision 816 - (hide annotations) (download)
    Fri Apr 24 18:33:46 2009 UTC (15 years ago) by niro
    File MIME type: text/plain
    File size: 4289 byte(s) 
    -updated to busybox-1.13.4
    1 niro 532 /* vi: set sw=4 ts=4: */
    2     /* Copyright 2001 Glenn McGrath.
    3     *
    4     * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    5     */
    6    
    7     #include "libbb.h"
    8     #include "unarchive.h"
    9    
    10 niro 816 char FAST_FUNC get_header_ar(archive_handle_t *archive_handle)
    11 niro 532 {
    12     int err;
    13     file_header_t *typed = archive_handle->file_header;
    14     union {
    15     char raw[60];
    16     struct {
    17     char name[16];
    18     char date[12];
    19     char uid[6];
    20     char gid[6];
    21     char mode[8];
    22     char size[10];
    23     char magic[2];
    24     } formatted;
    25     } ar;
    26 niro 816 #if ENABLE_FEATURE_AR_LONG_FILENAMES
    27 niro 532 static char *ar_long_names;
    28 niro 816 static unsigned ar_long_name_size;
    29 niro 532 #endif
    30    
    31     /* dont use xread as we want to handle the error ourself */
    32     if (read(archive_handle->src_fd, ar.raw, 60) != 60) {
    33     /* End Of File */
    34     return EXIT_FAILURE;
    35     }
    36    
    37     /* ar header starts on an even byte (2 byte aligned)
    38     * '\n' is used for padding
    39     */
    40     if (ar.raw[0] == '\n') {
    41     /* fix up the header, we started reading 1 byte too early */
    42     memmove(ar.raw, &ar.raw[1], 59);
    43     ar.raw[59] = xread_char(archive_handle->src_fd);
    44     archive_handle->offset++;
    45     }
    46     archive_handle->offset += 60;
    47    
    48     /* align the headers based on the header magic */
    49     if (ar.formatted.magic[0] != '`' || ar.formatted.magic[1] != '\n')
    50     bb_error_msg_and_die("invalid ar header");
    51    
    52     /* FIXME: more thorough routine would be in order here */
    53     /* (we have something like that in tar) */
    54     /* but for now we are lax. This code works because */
    55     /* on misformatted numbers bb_strtou returns all-ones */
    56     typed->mode = err = bb_strtou(ar.formatted.mode, NULL, 8);
    57     if (err == -1) bb_error_msg_and_die("invalid ar header");
    58     typed->mtime = err = bb_strtou(ar.formatted.date, NULL, 10);
    59     if (err == -1) bb_error_msg_and_die("invalid ar header");
    60     typed->uid = err = bb_strtou(ar.formatted.uid, NULL, 10);
    61     if (err == -1) bb_error_msg_and_die("invalid ar header");
    62     typed->gid = err = bb_strtou(ar.formatted.gid, NULL, 10);
    63     if (err == -1) bb_error_msg_and_die("invalid ar header");
    64     typed->size = err = bb_strtou(ar.formatted.size, NULL, 10);
    65     if (err == -1) bb_error_msg_and_die("invalid ar header");
    66    
    67     /* long filenames have '/' as the first character */
    68     if (ar.formatted.name[0] == '/') {
    69 niro 816 #if ENABLE_FEATURE_AR_LONG_FILENAMES
    70     unsigned long_offset;
    71    
    72 niro 532 if (ar.formatted.name[1] == '/') {
    73     /* If the second char is a '/' then this entries data section
    74     * stores long filename for multiple entries, they are stored
    75     * in static variable long_names for use in future entries */
    76     ar_long_name_size = typed->size;
    77     ar_long_names = xmalloc(ar_long_name_size);
    78     xread(archive_handle->src_fd, ar_long_names, ar_long_name_size);
    79     archive_handle->offset += ar_long_name_size;
    80     /* This ar entries data section only contained filenames for other records
    81     * they are stored in the static ar_long_names for future reference */
    82     return get_header_ar(archive_handle); /* Return next header */
    83 niro 816 }
    84    
    85     if (ar.formatted.name[1] == ' ') {
    86 niro 532 /* This is the index of symbols in the file for compilers */
    87     data_skip(archive_handle);
    88     archive_handle->offset += typed->size;
    89     return get_header_ar(archive_handle); /* Return next header */
    90     }
    91 niro 816
    92     /* The number after the '/' indicates the offset in the ar data section
    93     * (saved in variable long_name) that conatains the real filename */
    94     long_offset = atoi(&ar.formatted.name[1]);
    95     if (long_offset >= ar_long_name_size) {
    96     bb_error_msg_and_die("can't resolve long filename");
    97     }
    98     typed->name = xstrdup(ar_long_names + long_offset);
    99 niro 532 #else
    100     bb_error_msg_and_die("long filenames not supported");
    101     #endif
    102     } else {
    103     /* short filenames */
    104     typed->name = xstrndup(ar.formatted.name, 16);
    105     }
    106    
    107     typed->name[strcspn(typed->name, " /")] = '\0';
    108    
    109     if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
    110     archive_handle->action_header(typed);
    111 niro 816 #if ENABLE_DPKG || ENABLE_DPKG_DEB
    112 niro 532 if (archive_handle->sub_archive) {
    113     while (archive_handle->action_data_subarchive(archive_handle->sub_archive) == EXIT_SUCCESS)
    114 niro 816 continue;
    115     } else
    116     #endif
    117 niro 532 archive_handle->action_data(archive_handle);
    118     } else {
    119     data_skip(archive_handle);
    120     }
    121    
    122     archive_handle->offset += typed->size;
    123     /* Set the file pointer to the correct spot, we may have been reading a compressed file */
    124     lseek(archive_handle->src_fd, archive_handle->offset, SEEK_SET);
    125    
    126     return EXIT_SUCCESS;
    127     }