X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/rsbs2/blobdiff_plain/7fe9e3fd316d6ccf4e7b47795e1886ebb19190c4..e8563c43527e7f0fcb338069f39d74d252340d28:/filesystem.c

diff --git a/filesystem.c b/filesystem.c
new file mode 100644
index 0000000..2d71946
--- /dev/null
+++ b/filesystem.c
@@ -0,0 +1,198 @@
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <limits.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <strings.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <libgen.h>
+#include "rsb-lz.h"
+#include "filesystem.h"
+
+struct file_entry* get_next_file(unsigned char *fw, int len)
+{
+	static unsigned char *pos;
+	static unsigned char *start;
+	static unsigned char *end;
+	static struct file_entry fent;
+	int name_length;
+
+	if (fw != NULL && len != 0) {
+		pos = fw + 0x28;
+
+#if 0
+		printf("Start of filesystem: 0x%08x\n", *((unsigned int*)pos));
+#endif
+		start = fw;
+		pos = fw + *((unsigned int*)pos);
+		end = fw + len;
+	}
+
+	fent.unknown = *pos;
+	pos++;
+
+	if (fent.unknown == 0x00) {
+		/* EOF */
+		int fill = (4 - ((pos - start) % 4)) % 4;
+		int i;
+
+		for (i = 0; i < fill; i++) {
+			if (*pos != 0xff) {
+				fprintf(stderr, "Wrong fill byte after EOF: 0x%02x, aborting!\n", *pos);
+				exit(1);
+			}
+			pos++;
+		}
+
+		if (pos != end) {
+			fprintf(stderr, "EOF marker not at end-of-file %p <-> %p, aborting!\n", pos, end);
+			exit(1);
+		}
+
+		return NULL;
+	}
+
+
+	name_length = *((unsigned int*)pos);
+	pos += 4;
+
+	fent.length = *((unsigned int*)pos);
+	pos += 4;
+
+	if ((fent.length > (end - pos)) ||
+	    (name_length > (end - pos))) {
+		printf("EOF reached without hitting EOF marker, aborting "
+			"(unknown: 0x%02x, namelen: 0x%08x, contentlen: 0x%08x!\n",
+			fent.unknown, name_length, fent.length);
+		exit(1);
+	}
+
+	fent.name = (char*)pos;
+	pos += name_length;
+
+	fent.start = pos;
+	pos += fent.length;
+
+	return &fent;
+}
+
+void extract_files(unsigned char *fw, int len)
+{
+	struct file_entry *fent;
+
+	fent = get_next_file(fw, len);
+	
+	while (fent) {
+		printf("%s: unknown: 0x%02x, length: %d",
+			fent->name, fent->unknown, fent->length);
+
+		if (fent->length > 0) {
+			write_file(fent->name, fent->start, fent->length);
+			if (*((unsigned int*)fent->start) == LZ_MAGIC) {
+				char *lzname;
+
+				if ((lzname = strdup(fent->name)) == NULL) {
+					perror("strdup");
+					exit(1);
+				}
+
+				if (!strcmp(lzname + strlen(lzname) - 4 , ".lz")) {
+					fprintf(stderr, "Ugh, can't derive filename...\n");
+					exit(1);
+				}
+				lzname[strlen(lzname) - 3] = 0x00;
+
+				printf("%s: packed file found", lzname);
+
+				extract_lz_file(fent->start, (unsigned char*)lzname);
+				free(lzname);
+			} else if (!strcmp(fent->name, "firmware")) {
+				unsigned char *lzpos;
+				char lzname[128];
+
+				bzero(lzname, sizeof(lzname));
+				strcpy(lzname, "firmware.");
+
+				lzpos = fent->start + *((unsigned int*)(fent->start + 0x20));
+				memcpy(lzname + strlen(lzname), lzpos - 4, 4);
+				lzpos += 4;
+				if (*((unsigned int*)(lzpos)) == LZ_MAGIC) {
+					printf("%s: compressed firmware part found", lzname);
+					extract_lz_file(lzpos, (unsigned char*)lzname);
+				}
+			}
+		} else {
+			printf(", ignoring...\n");
+		}
+		fent = get_next_file(NULL, 0);
+	}
+}
+
+void mkdir_p(char *dir)
+{
+	char *copy, *parent;
+
+	if ((dir == NULL) || (!strcmp(dir, ".")))
+		return;
+
+	if ((copy = strdup(dir)) == NULL) {
+		perror("strdup");
+		exit(1);
+	}
+	parent = dirname(copy);
+	mkdir_p(parent);
+
+	errno = 0;
+	if (mkdir(dir, 0755) == -1) {
+		if (errno != EEXIST) {
+			fprintf(stderr, "%s: ", dir);
+			perror("mkdir");
+			exit(1);
+		}
+	}
+	free(copy);
+}
+
+void write_file(char *fname, unsigned char *buf, int len)
+{
+	char filename[PATH_MAX];
+	char *filename_c, *dirn;
+	int fd;
+	int remaining;
+	int ret;
+
+	strcpy(filename, "extracted/");
+	strcat(filename, fname);
+
+	if ((filename_c = strdup(filename)) == NULL) {
+		perror("strdup");
+		exit(1);
+	}
+	dirn = dirname(filename_c);
+	mkdir_p(dirn);
+	free(filename_c);
+
+	if ((fd = open(filename, O_WRONLY|O_CREAT, 0644)) == -1) {
+		fprintf(stderr, "%s: ", filename);
+		perror("open");
+		exit(1);
+	}
+
+	remaining = len;
+
+	while(remaining) {
+		ret = write(fd, buf + (len - remaining), remaining);
+		if (ret < 0) {
+			perror("write");
+			exit(1);
+		}
+		remaining -= ret;
+	}
+
+	printf(", %s written.\n", filename);
+
+	close(fd);
+}