From 833d4e7f84f59099ee66eabfa3457ebb7d37eaa8 Mon Sep 17 00:00:00 2001
From: Denys Vlasenko
Date: Wed, 3 Nov 2010 02:38:31 +0100
Subject: rename archival/libunarchive -> archival/libarchive; move bz/ into it

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
 archival/libarchive/get_header_ar.c | 133 ++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 archival/libarchive/get_header_ar.c

(limited to 'archival/libarchive/get_header_ar.c')

diff --git a/archival/libarchive/get_header_ar.c b/archival/libarchive/get_header_ar.c
new file mode 100644
index 0000000..df603b1
--- /dev/null
+++ b/archival/libarchive/get_header_ar.c
@@ -0,0 +1,133 @@
+/* vi: set sw=4 ts=4: */
+/* Copyright 2001 Glenn McGrath.
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+#include "libbb.h"
+#include "archive.h"
+#include "ar.h"
+
+static unsigned read_num(const char *str, int base)
+{
+	/* This code works because
+	 * on misformatted numbers bb_strtou returns all-ones */
+	int err = bb_strtou(str, NULL, base);
+	if (err == -1)
+		bb_error_msg_and_die("invalid ar header");
+	return err;
+}
+
+char FAST_FUNC get_header_ar(archive_handle_t *archive_handle)
+{
+	file_header_t *typed = archive_handle->file_header;
+	unsigned size;
+	union {
+		char raw[60];
+		struct ar_header formatted;
+	} ar;
+#if ENABLE_FEATURE_AR_LONG_FILENAMES
+	static char *ar_long_names;
+	static unsigned 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;
+
+	if (ar.formatted.magic[0] != '`' || ar.formatted.magic[1] != '\n')
+		bb_error_msg_and_die("invalid ar header");
+
+	/* FIXME: more thorough routine would be in order here
+	 * (we have something like that in tar)
+	 * but for now we are lax. */
+	ar.formatted.magic[0] = '\0'; /* else 4G-2 file will have size="4294967294`\n..." */
+	typed->size = size = read_num(ar.formatted.size, 10);
+
+	/* special filenames have '/' as the first character */
+	if (ar.formatted.name[0] == '/') {
+		if (ar.formatted.name[1] == ' ') {
+			/* This is the index of symbols in the file for compilers */
+			data_skip(archive_handle);
+			archive_handle->offset += size;
+			return get_header_ar(archive_handle); /* Return next header */
+		}
+#if ENABLE_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 = size;
+			free(ar_long_names);
+			ar_long_names = xmalloc(size);
+			xread(archive_handle->src_fd, ar_long_names, size);
+			archive_handle->offset += size;
+			/* Return next header */
+			return get_header_ar(archive_handle);
+		}
+#else
+		bb_error_msg_and_die("long filenames not supported");
+#endif
+	}
+	/* Only size is always present, the rest may be missing in
+	 * long filename pseudo file. Thus we decode the rest
+	 * after dealing with long filename pseudo file.
+	 */
+	typed->mode = read_num(ar.formatted.mode, 8);
+	typed->mtime = read_num(ar.formatted.date, 10);
+	typed->uid = read_num(ar.formatted.uid, 10);
+	typed->gid = read_num(ar.formatted.gid, 10);
+
+#if ENABLE_FEATURE_AR_LONG_FILENAMES
+	if (ar.formatted.name[0] == '/') {
+		unsigned long_offset;
+
+		/* The number after the '/' indicates the offset in the ar data section
+		 * (saved in ar_long_names) that conatains the real filename */
+		long_offset = read_num(&ar.formatted.name[1], 10);
+		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
+#endif
+	{
+		/* 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 ENABLE_DPKG || ENABLE_DPKG_DEB
+		if (archive_handle->dpkg__sub_archive) {
+			while (archive_handle->dpkg__action_data_subarchive(archive_handle->dpkg__sub_archive) == EXIT_SUCCESS)
+				continue;
+		} else
+#endif
+			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;
+}
-- 
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