imxtools: introduce rsrctool to manipulate rsrc sections

This tool is very preliminary but could be use for whatever
purpose since the format of the rsrc sections is now known.
By the way it appears that this format is the same as the
one use by the stmp36xx for its resources.

Change-Id: Idd7057f5cdce5af9726904169bb100c8bacb0981

1 files changed, 227 insertions, 0 deletions

diff --git a/utils/imxtools/sbtools/rsrc.c b/utils/imxtools/sbtools/rsrc.c
new file mode 100644
index 0000000000..da3c418d2c
--- /dev/null
+++ b/utils/imxtools/sbtools/rsrc.c
@@ -0,0 +1,227 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2012 Amaury Pouly
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include "misc.h"
+#include "crypto.h"
+#include "rsrc.h"
+
+const char crypto_key[16] = "SanDiskSlotRadi";
+
+static void rsrc_crypt(void *buf, int size)
+{
+    if(size % 16)
+        printf("Size must be a multiple of 16 !\n");
+    uint8_t *p = buf;
+    for(int i = 0; i < size; i+= 16, p += 16)
+    {
+        for(int j = 0; j < 16; j++)
+            p[j] ^= crypto_key[j];
+    }
+}
+
+enum rsrc_error_t rsrc_write_file(struct rsrc_file_t *rsrc, const char *filename)
+{
+    FILE *f = fopen(filename, "wb");
+    if(f == NULL)
+        return RSRC_OPEN_ERROR;
+    fwrite(rsrc->data, 1, rsrc->size, f);
+    fclose(f);
+    return RSRC_SUCCESS;
+}
+
+struct rsrc_file_t *rsrc_read_file(const char *filename, void *u,
+    rsrc_color_printf cprintf, enum rsrc_error_t *err)
+{
+    return rsrc_read_file_ex(filename, 0, -1, u, cprintf, err);
+}
+
+struct rsrc_file_t *rsrc_read_file_ex(const char *filename, size_t offset, size_t size, void *u,
+    rsrc_color_printf cprintf, enum rsrc_error_t *err)
+{
+    #define fatal(e, ...) \
+        do { if(err) *err = e; \
+            cprintf(u, true, GREY, __VA_ARGS__); \
+            free(buf); \
+            return NULL; } while(0)
+
+    FILE *f = fopen(filename, "rb");
+    void *buf = NULL;
+    if(f == NULL)
+        fatal(RSRC_OPEN_ERROR, "Cannot open file for reading\n");
+    fseek(f, 0, SEEK_END);
+    size_t read_size = ftell(f);
+    fseek(f, offset, SEEK_SET);
+    if(size != (size_t)-1)
+        read_size = size;
+    buf = xmalloc(read_size);
+    if(fread(buf, read_size, 1, f) != 1)
+    {
+        fclose(f);
+        fatal(RSRC_READ_ERROR, "Cannot read file\n");
+    }
+    fclose(f);
+
+    struct rsrc_file_t *ret = rsrc_read_memory(buf, read_size, u, cprintf, err);
+    free(buf);
+    return ret;
+
+    #undef fatal
+}
+
+static const char *rsrc_table_entry_type_str(int type)
+{
+    switch(type)
+    {
+        case RSRC_TYPE_NONE: return "empty";
+        case RSRC_TYPE_NESTED: return "nested";
+        case RSRC_TYPE_IMAGE: return "image";
+        case RSRC_TYPE_VALUE: return "value";
+        case RSRC_TYPE_AUDIO: return "audio";
+        case RSRC_TYPE_DATA: return "data";
+        default: return "unknown";
+    }
+}
+
+static bool read_entries(void *buf, int filesize, void *u,
+    rsrc_color_printf cprintf, enum rsrc_error_t *err,
+    int offset, uint32_t base_index, int level, char *prefix)
+{
+    #define printf(c, ...) cprintf(u, false, c, __VA_ARGS__)
+    #define fatal(e, ...) \
+        do { if(err) *err = e; \
+            cprintf(u, true, GREY, __VA_ARGS__); \
+            return e; } while(0)
+
+    if(offset >= filesize)
+        fatal(RSRC_FORMAT_ERROR, "Out of bounds at off=%x base=%x level=%d\n ouch\n");
+    if(level < 0)
+        fatal(RSRC_FORMAT_ERROR, "Out of levels at off=%x base=%x level=%d\n aie\n");
+    for(int i = 0; i < 256; i++)
+    {
+        uint32_t te = *(uint32_t *)(buf + offset + 4 * i);
+        if(RSRC_TABLE_ENTRY_TYPE(te) == RSRC_TYPE_NONE)
+            continue;
+        uint32_t sz = 0;
+        if(RSRC_TABLE_ENTRY_TYPE(te) == RSRC_TYPE_VALUE)
+            sz = 2;
+        else if(RSRC_TABLE_ENTRY_TYPE(te) == RSRC_TYPE_NESTED)
+            sz = 4 * 256;
+        else
+            sz = *(uint32_t *)(buf + RSRC_TABLE_ENTRY_OFFSET(te));
+
+        uint32_t index =  base_index | i << (level * 8);
+        printf(OFF, "%s+-%s%#08x %s[%s]%s[size=%#x]\n", prefix, YELLOW, index, BLUE,
+            rsrc_table_entry_type_str(RSRC_TABLE_ENTRY_TYPE(te)),
+            GREEN, sz);
+        
+        if(RSRC_TABLE_ENTRY_TYPE(te) == RSRC_TYPE_NESTED)
+        {
+            char *p = prefix + strlen(prefix);
+            sprintf(p, "%s|  ", RED);
+            
+            bool ok = read_entries(buf, filesize, u, cprintf, err,
+                RSRC_TABLE_ENTRY_OFFSET(te), index,
+                level - 1, prefix);
+            if(!ok)
+                return false;
+            *p = 0;
+        }
+    }
+    
+    return true;
+    #undef printf
+    #undef fatal
+}
+
+struct rsrc_file_t *rsrc_read_memory(void *_buf, size_t filesize, void *u,
+    rsrc_color_printf cprintf, enum rsrc_error_t *err)
+{
+    struct rsrc_file_t *rsrc_file = NULL;
+    uint8_t *buf = _buf;
+
+    #define printf(c, ...) cprintf(u, false, c, __VA_ARGS__)
+    #define fatal(e, ...) \
+        do { if(err) *err = e; \
+            cprintf(u, true, GREY, __VA_ARGS__); \
+            rsrc_free(rsrc_file); \
+            return NULL; } while(0)
+    #define print_hex(c, p, len, nl) \
+        do { printf(c, ""); print_hex(p, len, nl); } while(0)
+
+    rsrc_file = xmalloc(sizeof(struct rsrc_file_t));
+    memset(rsrc_file, 0, sizeof(struct rsrc_file_t));
+
+    /* There is a padding sector at the beginning of the file with a RSRC string.
+     * It is unclear if this is a signature since no code I've disassembled
+     * actually checks it. Allow use of -force to bypass. */
+    if(memcmp(buf + 20, "RSRC", 4) != 0)
+    {
+        if(g_force)
+            printf(GREY, "Missing RSRC signature\n");
+        else
+            fatal(RSRC_FORMAT_ERROR, "Missing RSRC signature\n");
+    }
+
+    printf(BLUE, "Entries\n");
+    char prefix[1024];
+    sprintf(prefix, "%s", RED);
+    bool ok = read_entries(buf, filesize, u, cprintf, err,
+        RSRC_SECTOR_SIZE, 0, 3, prefix);
+    if(!ok)
+        fatal(*err, "Error while parsing rsrc table\n");
+
+    rsrc_file->data = malloc(filesize);
+    memcpy(rsrc_file->data, _buf, filesize);
+    rsrc_file->size = filesize;
+    
+    return rsrc_file;
+    #undef printf
+    #undef fatal
+    #undef print_hex
+}
+
+void rsrc_free(struct rsrc_file_t *file)
+{
+    if(!file) return;
+    free(file);
+}
+
+void rsrc_dump(struct rsrc_file_t *file, void *u, rsrc_color_printf cprintf)
+{
+    #define printf(c, ...) cprintf(u, false, c, __VA_ARGS__)
+    #define print_hex(c, p, len, nl) \
+        do { printf(c, ""); print_hex(p, len, nl); } while(0)
+
+    #define TREE    RED
+    #define HEADER  GREEN
+    #define TEXT    YELLOW
+    #define TEXT2   BLUE
+    #define SEP     OFF
+
+    printf(HEADER, "RSRC File\n");
+
+    #undef printf
+    #undef print_hex
+}
+