*** empty log message ***

archival/libunarchive/get_header_ar.c

@@ -0,0 +1,106 @@
+/*
+ *  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 "unarchive.h"
+#include "libbb.h"
+
+file_header_t *get_header_ar(FILE *src_stream)
+{
+	file_header_t *typed;
+	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;
+	static char *ar_long_names;
+
+	if (fread(ar.raw, 1, 60, src_stream) != 60) {
+		return(NULL);
+	}
+	archive_offset += 60;
+	/* align the headers based on the header magic */
+	if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) {
+		/* some version of ar, have an extra '\n' after each data entry,
+		 * this puts the next header out by 1 */
+		if (ar.formated.magic[1] != '`') {
+			error_msg("Invalid magic");
+			return(NULL);
+		}
+		/* read the next char out of what would be the data section,
+		 * if its a '\n' then it is a valid header offset by 1*/
+		archive_offset++;
+		if (fgetc(src_stream) != '\n') {
+			error_msg("Invalid magic");
+			return(NULL);
+		}
+		/* fix up the header, we started reading 1 byte too early */
+		/* raw_header[60] wont be '\n' as it should, but it doesnt matter */
+		memmove(ar.raw, &ar.raw[1], 59);
+	}
+		
+	typed = (file_header_t *) xcalloc(1, sizeof(file_header_t));
+
+	typed->size = (size_t) atoi(ar.formated.size);
+	/* long filenames have '/' as the first character */
+	if (ar.formated.name[0] == '/') {
+		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_names = (char *) xrealloc(ar_long_names, typed->size);
+			fread(ar_long_names, 1, typed->size, src_stream);
+			archive_offset += typed->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(src_stream)); /* Return next header */
+		} else if (ar.formated.name[1] == ' ') {
+			/* This is the index of symbols in the file for compilers */
+			seek_sub_file(src_stream, typed->size);
+			return (get_header_ar(src_stream)); /* 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 */
+			if (!ar_long_names) {
+				error_msg("Cannot resolve long file name");
+				return (NULL);
+			}
+			typed->name = xstrdup(ar_long_names + atoi(&ar.formated.name[1]));
+		}
+	} else {
+		/* short filenames */
+		typed->name = xcalloc(1, 16);
+		strncpy(typed->name, ar.formated.name, 16);
+	}
+	typed->name[strcspn(typed->name, " /")]='\0';
+
+	/* convert the rest of the now valid char header to its typed struct */	
+	parse_mode(ar.formated.mode, &typed->mode);
+	typed->mtime = atoi(ar.formated.date);
+	typed->uid = atoi(ar.formated.uid);
+	typed->gid = atoi(ar.formated.gid);
+
+	return(typed);
+}