forked from len0rd/rockbox
c876d3bbef
rbutil uses several components from the utils folder, and can be considered part of utils too. Having it in a separate folder is an arbitrary split that doesn't help anymore these days, so merge them. This also allows other utils to easily use libtools.make without the need to navigate to a different folder. Change-Id: I3fc2f4de19e3e776553efb5dea5f779dfec0dc21
170 lines
6.1 KiB
C
170 lines
6.1 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2021 Aidan MacDonald
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "jztool.h"
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#include <string.h>
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/* Following is copied from mkspl-x1000, basically */
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struct x1000_spl_header {
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uint8_t magic[8];
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uint8_t type;
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uint8_t crc7;
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uint8_t ppb;
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uint8_t bpp;
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uint32_t length;
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};
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static const uint8_t x1000_spl_header_magic[8] =
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{0x06, 0x05, 0x04, 0x03, 0x02, 0x55, 0xaa, 0x55};
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static const size_t X1000_SPL_HEADER_SIZE = 2 * 1024;
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static uint8_t crc7(const uint8_t* buf, size_t len)
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{
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/* table-based computation of CRC7 */
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static const uint8_t t[256] = {
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0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f,
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0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77,
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0x19, 0x10, 0x0b, 0x02, 0x3d, 0x34, 0x2f, 0x26,
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0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c, 0x67, 0x6e,
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0x32, 0x3b, 0x20, 0x29, 0x16, 0x1f, 0x04, 0x0d,
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0x7a, 0x73, 0x68, 0x61, 0x5e, 0x57, 0x4c, 0x45,
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0x2b, 0x22, 0x39, 0x30, 0x0f, 0x06, 0x1d, 0x14,
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0x63, 0x6a, 0x71, 0x78, 0x47, 0x4e, 0x55, 0x5c,
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0x64, 0x6d, 0x76, 0x7f, 0x40, 0x49, 0x52, 0x5b,
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0x2c, 0x25, 0x3e, 0x37, 0x08, 0x01, 0x1a, 0x13,
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0x7d, 0x74, 0x6f, 0x66, 0x59, 0x50, 0x4b, 0x42,
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0x35, 0x3c, 0x27, 0x2e, 0x11, 0x18, 0x03, 0x0a,
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0x56, 0x5f, 0x44, 0x4d, 0x72, 0x7b, 0x60, 0x69,
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0x1e, 0x17, 0x0c, 0x05, 0x3a, 0x33, 0x28, 0x21,
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0x4f, 0x46, 0x5d, 0x54, 0x6b, 0x62, 0x79, 0x70,
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0x07, 0x0e, 0x15, 0x1c, 0x23, 0x2a, 0x31, 0x38,
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0x41, 0x48, 0x53, 0x5a, 0x65, 0x6c, 0x77, 0x7e,
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0x09, 0x00, 0x1b, 0x12, 0x2d, 0x24, 0x3f, 0x36,
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0x58, 0x51, 0x4a, 0x43, 0x7c, 0x75, 0x6e, 0x67,
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0x10, 0x19, 0x02, 0x0b, 0x34, 0x3d, 0x26, 0x2f,
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0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c,
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0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04,
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0x6a, 0x63, 0x78, 0x71, 0x4e, 0x47, 0x5c, 0x55,
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0x22, 0x2b, 0x30, 0x39, 0x06, 0x0f, 0x14, 0x1d,
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0x25, 0x2c, 0x37, 0x3e, 0x01, 0x08, 0x13, 0x1a,
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0x6d, 0x64, 0x7f, 0x76, 0x49, 0x40, 0x5b, 0x52,
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0x3c, 0x35, 0x2e, 0x27, 0x18, 0x11, 0x0a, 0x03,
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0x74, 0x7d, 0x66, 0x6f, 0x50, 0x59, 0x42, 0x4b,
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0x17, 0x1e, 0x05, 0x0c, 0x33, 0x3a, 0x21, 0x28,
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0x5f, 0x56, 0x4d, 0x44, 0x7b, 0x72, 0x69, 0x60,
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0x0e, 0x07, 0x1c, 0x15, 0x2a, 0x23, 0x38, 0x31,
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0x46, 0x4f, 0x54, 0x5d, 0x62, 0x6b, 0x70, 0x79
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};
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uint8_t crc = 0;
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while(len--)
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crc = t[(crc << 1) ^ *buf++];
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return crc;
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}
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/** \brief Identify a file as an SPL for X1000 CPUs
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* \param data File data buffer
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* \param len Length of file
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* \return JZ_SUCCESS if file looks correct, or one of the following errors
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* \retval JZ_IDERR_WRONG_SIZE file too small or size doesn't match header
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* \retval JZ_IDERR_BAD_HEADER missing magic bytes from header
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* \retval JZ_IDERR_BAD_CHECKSUM CRC7 mismatch
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*/
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int jz_identify_x1000_spl(const void* data, size_t len)
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{
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/* Use <= check because a header-only file is not really valid,
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* it should have at least one byte in it... */
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if(len <= X1000_SPL_HEADER_SIZE)
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return JZ_IDERR_WRONG_SIZE;
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/* Look for header magic bytes */
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const struct x1000_spl_header* header = (const struct x1000_spl_header*)data;
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if(memcmp(header->magic, x1000_spl_header_magic, 8))
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return JZ_IDERR_BAD_HEADER;
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/* Length stored in the header should equal the length of the file */
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if(header->length != len)
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return JZ_IDERR_WRONG_SIZE;
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/* Compute the CRC7 checksum; it only covers the SPL code */
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const uint8_t* dat = (const uint8_t*)data;
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uint8_t sum = crc7(&dat[X1000_SPL_HEADER_SIZE], len - X1000_SPL_HEADER_SIZE);
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if(header->crc7 != sum)
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return JZ_IDERR_BAD_CHECKSUM;
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return JZ_SUCCESS;
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}
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static const struct scramble_model_info {
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const char* name;
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int model_num;
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size_t offset_crc;
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size_t offset_name;
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size_t offset_data;
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} scramble_models[] = {
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{"fiio", 114, 0, 4, 8},
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{"shq1", 115, 0, 4, 8},
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{"eros", 116, 0, 4, 8},
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{NULL, 0, 0, 0, 0},
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};
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/** \brief Identify a file as a Rockbox `scramble` image
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* \param data File data buffer
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* \param len Length of file
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* \return JZ_SUCCESS if file looks correct, or one of the following errors
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* \retval JZ_IDERR_UNRECOGNIZED_MODEL unsupported/unknown model type
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* \retval JZ_IDERR_BAD_CHECKSUM checksum mismatch
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*/
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int jz_identify_scramble_image(const void* data, size_t len)
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{
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const uint8_t* dat;
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const struct scramble_model_info* model_info;
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uint32_t sum, file_sum;
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dat = (const uint8_t*)data;
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model_info = &scramble_models[0];
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/* Look up the model number */
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for(; model_info->name != NULL; ++model_info) {
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if(model_info->offset_name + 4 > len)
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continue;
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if(!memcmp(&dat[model_info->offset_name], model_info->name, 4))
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break;
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}
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if(model_info->name == NULL)
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return JZ_IDERR_UNRECOGNIZED_MODEL;
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/* Compute the checksum */
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sum = model_info->model_num;
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for(size_t i = model_info->offset_data; i < len; ++i)
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sum += dat[i];
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/* Compare with file's checksum, it's stored in big-endian form */
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dat += model_info->offset_crc;
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file_sum = (dat[0] << 24) | (dat[1] << 16) | (dat[2] << 8) | dat[3];
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if(sum != file_sum)
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return JZ_IDERR_BAD_CHECKSUM;
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return JZ_SUCCESS;
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}
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