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-rw-r--r--src/Makefile.am2
-rw-r--r--src/ftab.c196
-rw-r--r--src/ftab.h69
3 files changed, 266 insertions, 1 deletions
diff --git a/src/Makefile.am b/src/Makefile.am
index 1e141d1..a27f961 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -23,7 +23,7 @@ AM_LDADD = $(AC_LDADD)
bin_PROGRAMS = idevicerestore
-idevicerestore_SOURCES = idevicerestore.c common.c tss.c fls.c mbn.c img3.c img4.c ipsw.c normal.c dfu.c recovery.c restore.c asr.c fdr.c limera1n.c download.c locking.c socket.c thread.c jsmn.c json_plist.c
+idevicerestore_SOURCES = idevicerestore.c common.c tss.c fls.c mbn.c img3.c img4.c ftab.c ipsw.c normal.c dfu.c recovery.c restore.c asr.c fdr.c limera1n.c download.c locking.c socket.c thread.c jsmn.c json_plist.c
idevicerestore_CFLAGS = $(AM_CFLAGS)
idevicerestore_LDFLAGS = $(AM_LDFLAGS)
idevicerestore_LDADD = $(AM_LDADD)
diff --git a/src/ftab.c b/src/ftab.c
new file mode 100644
index 0000000..28ea40f
--- /dev/null
+++ b/src/ftab.c
@@ -0,0 +1,196 @@
+/*
+ * ftab.c
+ * Functions for handling the ftab format
+ *
+ * Copyright (c) 2019 Nikias Bassen. All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "ftab.h"
+#include "common.h"
+#include "endianness.h"
+
+int ftab_parse(unsigned char *data, unsigned int data_size, ftab_t *ftab, uint32_t *tag)
+{
+ if (!data || !data_size || !ftab) {
+ return -1;
+ }
+
+ if (data_size < sizeof(struct ftab_header)) {
+ error("ERROR: %s: Buffer too small for ftab data\n", __func__);
+ return -1;
+ }
+
+ struct ftab_header *hdr_ptr = (struct ftab_header*)data;
+ if (be32toh(hdr_ptr->magic) != 'ftab') {
+ error("ERROR: %s: Unexpected magic value 0x%08x\n", le32toh(hdr_ptr->magic));
+ return -1;
+ }
+
+ /* copy header */
+ ftab_t ftab_new = (ftab_t)calloc(1, sizeof(struct ftab_fmt));
+ memcpy(&ftab_new->header, data, sizeof(struct ftab_header));
+
+ ftab_new->header.always_01 = le32toh(ftab_new->header.always_01);
+ ftab_new->header.always_ff = le32toh(ftab_new->header.always_ff);
+ ftab_new->header.tag = be32toh(ftab_new->header.tag);
+ if (tag) {
+ *tag = ftab_new->header.tag;
+ }
+ ftab_new->header.magic = be32toh(ftab_new->header.magic);
+ ftab_new->header.num_entries = le32toh(ftab_new->header.num_entries);
+
+ /* copy entries */
+ ftab_new->entries = (struct ftab_entry*)malloc(sizeof(struct ftab_entry) * ftab_new->header.num_entries);
+ memcpy(ftab_new->entries, data + sizeof(struct ftab_header), sizeof(struct ftab_entry) * ftab_new->header.num_entries);
+
+ /* create data storage */
+ ftab_new->storage = (unsigned char**)calloc(ftab_new->header.num_entries, sizeof(unsigned char*));
+
+ /* fill data storage */
+ uint32_t i = 0;
+ for (i = 0; i < ftab_new->header.num_entries; i++) {
+ ftab_new->entries[i].tag = be32toh(ftab_new->entries[i].tag);
+ ftab_new->entries[i].offset = le32toh(ftab_new->entries[i].offset);
+ ftab_new->entries[i].size = le32toh(ftab_new->entries[i].size);
+
+ ftab_new->storage[i] = malloc(ftab_new->entries[i].size);
+ memcpy(ftab_new->storage[i], data + ftab_new->entries[i].offset, ftab_new->entries[i].size);
+ }
+
+ *ftab = ftab_new;
+
+ return 0;
+}
+
+int ftab_get_entry_ptr(ftab_t ftab, uint32_t tag, unsigned char **data, unsigned int *data_size)
+{
+ if (!ftab || !tag || !data || !data_size) {
+ return -1;
+ }
+
+ uint32_t i;
+ int res = -1;
+ for (i = 0; i < ftab->header.num_entries; i++) {
+ if (ftab->entries[i].tag == tag) {
+ *data = ftab->storage[i];
+ *data_size = ftab->entries[i].size;
+ res = 0;
+ }
+ }
+ return res;
+}
+
+int ftab_add_entry(ftab_t ftab, uint32_t tag, unsigned char *data, unsigned int data_size)
+{
+ if (!ftab || !tag || !data || !data_size) {
+ return -1;
+ }
+
+ uint32_t new_index = ftab->header.num_entries;
+ struct ftab_entry *new_entries = realloc(ftab->entries, sizeof(struct ftab_entry) * (ftab->header.num_entries + 1));
+ if (!new_entries) {
+ error("ERROR: %s: realloc failed!\n", __func__);
+ return -1;
+ }
+ ftab->entries = new_entries;
+ unsigned char **new_storage = realloc(ftab->storage, sizeof(unsigned char*) * (ftab->header.num_entries + 1));
+ if (!new_storage) {
+ error("ERROR: %s: realloc failed!\n", __func__);
+ return -1;
+ }
+ ftab->storage = new_storage;
+
+ unsigned char *data_copy = (unsigned char*)malloc(data_size);
+ if (!data_copy) {
+ return -1;
+ }
+ memcpy(data_copy, data, data_size);
+
+ ftab->storage[new_index] = data_copy;
+ ftab->entries[new_index].tag = tag;
+ ftab->entries[new_index].size = data_size;
+ ftab->header.num_entries++;
+
+ uint32_t off = sizeof(struct ftab_header) + sizeof(struct ftab_entry) * ftab->header.num_entries;
+ uint32_t i;
+ for (i = 0; i < ftab->header.num_entries; i++) {
+ ftab->entries[i].offset = off;
+ off += ftab->entries[i].size;
+ }
+
+ return 0;
+}
+
+int ftab_write(ftab_t ftab, unsigned char **data, unsigned int *data_size)
+{
+ uint32_t i;
+ unsigned int total_size = sizeof(struct ftab_header);
+ total_size += ftab->header.num_entries * sizeof(struct ftab_entry);
+ for (i = 0; i < ftab->header.num_entries; i++) {
+ total_size += ftab->entries[i].size;
+ }
+
+ unsigned char *data_out = (unsigned char*)malloc(total_size);
+ if (!data_out) {
+ error("ERROR: %s: Out of memory?!\n", __func__);
+ return -1;
+ }
+
+ struct ftab_header *ftab_header = (struct ftab_header*)data_out;
+ memset(ftab_header, '\0', sizeof(struct ftab_header));
+ ftab_header->always_01 = htole32(ftab->header.always_01);
+ ftab_header->always_ff = htole32(ftab->header.always_ff);
+ ftab_header->tag = htobe32(ftab->header.tag);
+ ftab_header->magic = htobe32(ftab->header.magic);
+ ftab_header->num_entries = htole32(ftab->header.num_entries);
+
+ for (i = 0; i < ftab->header.num_entries; i++) {
+ struct ftab_entry* entry = (struct ftab_entry*)(data_out + sizeof(struct ftab_header) + (sizeof(struct ftab_entry) * i));
+ entry->tag = htobe32(ftab->entries[i].tag);
+ entry->offset = htole32(ftab->entries[i].offset);
+ entry->size = htole32(ftab->entries[i].size);
+ entry->pad_0x0C = 0;
+ }
+
+ unsigned char *p = data_out + sizeof(struct ftab_header) + (sizeof(struct ftab_entry) * ftab->header.num_entries);
+ for (i = 0; i < ftab->header.num_entries; i++) {
+ memcpy(p, ftab->storage[i], ftab->entries[i].size);
+ p += ftab->entries[i].size;
+ }
+
+ *data = data_out;
+ *data_size = total_size;
+
+ return 0;
+}
+
+int ftab_free(ftab_t ftab)
+{
+ if (!ftab) return -1;
+ uint32_t i = 0;
+ for (i = 0; i < ftab->header.num_entries; i++) {
+ free(ftab->storage[i]);
+ }
+ free(ftab->storage);
+ free(ftab->entries);
+ free(ftab);
+ return 0;
+}
diff --git a/src/ftab.h b/src/ftab.h
new file mode 100644
index 0000000..2efdac3
--- /dev/null
+++ b/src/ftab.h
@@ -0,0 +1,69 @@
+/*
+ * ftab.h
+ * Functions for handling the ftab format
+ *
+ * Copyright (c) 2019 Nikias Bassen. All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef IDEVICERESTORE_FTAB_H
+#define IDEVICERESTORE_FTAB_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct ftab_header {
+ uint32_t always_01; // 1
+ uint32_t always_ff; // 0xFFFFFFFF
+ uint32_t unk_0x08; // 0
+ uint32_t unk_0x0C; // 0
+ uint32_t unk_0x10; // 0
+ uint32_t unk_0x14; // 0
+ uint32_t unk_0x18; // 0
+ uint32_t unk_0x1C; // 0
+ uint32_t tag; // e.g. 'rkos'
+ uint32_t magic; // 'ftab' magic
+ uint32_t num_entries;
+ uint32_t pad_0x2C;
+};
+
+struct ftab_entry {
+ uint32_t tag;
+ uint32_t offset;
+ uint32_t size;
+ uint32_t pad_0x0C;
+};
+
+struct ftab_fmt {
+ struct ftab_header header;
+ struct ftab_entry *entries;
+ unsigned char **storage;
+};
+
+typedef struct ftab_fmt *ftab_t;
+
+int ftab_parse(unsigned char *data, unsigned int data_size, ftab_t *ftab, uint32_t *tag);
+int ftab_get_entry_ptr(ftab_t ftab, uint32_t tag, unsigned char **data, unsigned int *data_size);
+int ftab_add_entry(ftab_t ftab, uint32_t tag, unsigned char *data, unsigned int data_size);
+int ftab_write(ftab_t ftab, unsigned char **data, unsigned int *data_size);
+int ftab_free(ftab_t ftab);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
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