diff options
Diffstat (limited to 'archival/libunarchive/get_header_ar.c')
-rw-r--r-- | archival/libunarchive/get_header_ar.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/archival/libunarchive/get_header_ar.c b/archival/libunarchive/get_header_ar.c new file mode 100644 index 000000000..7f8c81ca0 --- /dev/null +++ b/archival/libunarchive/get_header_ar.c @@ -0,0 +1,112 @@ +/* vi: set sw=4 ts=4: */ +/* Copyright 2001 Glenn McGrath. + * + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. + */ + +#include "libbb.h" +#include "unarchive.h" + +char get_header_ar(archive_handle_t *archive_handle) +{ + file_header_t *typed = archive_handle->file_header; + union { + char raw[60]; + struct { + char name[16]; + char date[12]; + char uid[6]; + char gid[6]; + char mode[8]; + char size[10]; + char magic[2]; + } formatted; + } ar; +#ifdef CONFIG_FEATURE_AR_LONG_FILENAMES + static char *ar_long_names; + static unsigned int ar_long_name_size; +#endif + + /* dont use xread as we want to handle the error ourself */ + if (read(archive_handle->src_fd, ar.raw, 60) != 60) { + /* End Of File */ + return EXIT_FAILURE; + } + + /* ar header starts on an even byte (2 byte aligned) + * '\n' is used for padding + */ + if (ar.raw[0] == '\n') { + /* fix up the header, we started reading 1 byte too early */ + memmove(ar.raw, &ar.raw[1], 59); + ar.raw[59] = xread_char(archive_handle->src_fd); + archive_handle->offset++; + } + archive_handle->offset += 60; + + /* align the headers based on the header magic */ + if ((ar.formatted.magic[0] != '`') || (ar.formatted.magic[1] != '\n')) { + bb_error_msg_and_die("invalid ar header"); + } + + typed->mode = xstrtoul(ar.formatted.mode, 8); + typed->mtime = xatou(ar.formatted.date); + typed->uid = xatou(ar.formatted.uid); + typed->gid = xatou(ar.formatted.gid); + typed->size = xatoul(ar.formatted.size); + + /* long filenames have '/' as the first character */ + if (ar.formatted.name[0] == '/') { +#ifdef CONFIG_FEATURE_AR_LONG_FILENAMES + if (ar.formatted.name[1] == '/') { + /* If the second char is a '/' then this entries data section + * stores long filename for multiple entries, they are stored + * in static variable long_names for use in future entries */ + ar_long_name_size = typed->size; + ar_long_names = xmalloc(ar_long_name_size); + xread(archive_handle->src_fd, ar_long_names, ar_long_name_size); + archive_handle->offset += ar_long_name_size; + /* This ar entries data section only contained filenames for other records + * they are stored in the static ar_long_names for future reference */ + return get_header_ar(archive_handle); /* Return next header */ + } else if (ar.formatted.name[1] == ' ') { + /* This is the index of symbols in the file for compilers */ + data_skip(archive_handle); + archive_handle->offset += typed->size; + return get_header_ar(archive_handle); /* Return next header */ + } else { + /* The number after the '/' indicates the offset in the ar data section + (saved in variable long_name) that conatains the real filename */ + const unsigned int long_offset = atoi(&ar.formatted.name[1]); + if (long_offset >= ar_long_name_size) { + bb_error_msg_and_die("can't resolve long filename"); + } + typed->name = xstrdup(ar_long_names + long_offset); + } +#else + bb_error_msg_and_die("long filenames not supported"); +#endif + } else { + /* short filenames */ + typed->name = xstrndup(ar.formatted.name, 16); + } + + typed->name[strcspn(typed->name, " /")] = '\0'; + + if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) { + archive_handle->action_header(typed); + if (archive_handle->sub_archive) { + while (archive_handle->action_data_subarchive(archive_handle->sub_archive) == EXIT_SUCCESS); + } else { + archive_handle->action_data(archive_handle); + } + } else { + data_skip(archive_handle); + } + + archive_handle->offset += typed->size; + /* Set the file pointer to the correct spot, we may have been reading a compressed file */ + lseek(archive_handle->src_fd, archive_handle->offset, SEEK_SET); + + return EXIT_SUCCESS; +} |