1 files changed, 126 insertions, 0 deletions
diff --git a/busybox/archival/libunarchive/get_header_ar.c b/busybox/archival/libunarchive/get_header_ar.c
new file mode 100644
index 0000000..ebb6f8c
--- /dev/null
+++ b/busybox/archival/libunarchive/get_header_ar.c
@@ -0,0 +1,126 @@
+/*
+ *  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 Library 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 <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "unarchive.h"
+#include "libbb.h"
+
+extern 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];
+ 		} formated;
+	} ar;
+#ifdef CONFIG_FEATURE_AR_LONG_FILENAMES
+	static char *ar_long_names;
+	static unsigned int ar_long_name_size;
+#endif
+
+	/* dont use bb_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] = bb_xread_char(archive_handle->src_fd);
+		archive_handle->offset++;
+	}
+	archive_handle->offset += 60;
+
+	/* align the headers based on the header magic */
+	if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) {
+		bb_error_msg_and_die("Invalid ar header");
+	}
+
+	typed->mode = strtol(ar.formated.mode, NULL, 8);
+	typed->mtime = atoi(ar.formated.date);
+	typed->uid = atoi(ar.formated.uid);
+	typed->gid = atoi(ar.formated.gid);
+	typed->size = atoi(ar.formated.size);
+
+	/* long filenames have '/' as the first character */
+	if (ar.formated.name[0] == '/') {
+#ifdef CONFIG_FEATURE_AR_LONG_FILENAMES
+		if (ar.formated.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);
+			bb_xread_all(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.formated.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.formated.name[1]);
+			if (long_offset >= ar_long_name_size) {
+				bb_error_msg_and_die("Cant resolve long filename");
+			}
+			typed->name = bb_xstrdup(ar_long_names + long_offset);
+		}
+#else
+		bb_error_msg_and_die("long filenames not supported");
+#endif
+	} else {
+		/* short filenames */
+               typed->name = bb_xstrndup(ar.formated.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);
+}