2023-04-11 19:00:14 -04:00
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/*
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* MiniVHD Minimalist VHD implementation in C.
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*
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* This file is part of the MiniVHD Project.
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*
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* Header and footer serialize/deserialize functions.
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*
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* Read data from footer into the struct members, swapping
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* endian where necessary.
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*
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* NOTE: Order matters here!
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* We must read each field in the order the struct is in.
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* Doing this may be less elegant than performing a memcpy
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* to a packed struct, but it avoids potential data alignment
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* issues, and the endian swapping allows us to use the fields
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* directly.
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*
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* Version: @(#)struct_rw.c 1.0.2 2021/04/16
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*
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* Author: Sherman Perry, <shermperry@gmail.com>
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*
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* Copyright 2019-2021 Sherman Perry.
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*
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* MIT License
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documenta-
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* tion files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall
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* be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF O R IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _FILE_OFFSET_BITS
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# define _FILE_OFFSET_BITS 64
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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2023-04-12 06:39:22 -04:00
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#include <time.h>
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2023-04-11 19:00:14 -04:00
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#include "minivhd.h"
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#include "internal.h"
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/**
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* \brief Get the next field from a buffer and store it in a struct member, converting endian if necessary
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*
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* \param [out] struct_memb struct member to save the field to
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* \param [in] memb_size the size of struct_memb, in bytes
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* \param [in] req_endian is the field a value that requires endian conversion (eg: uint16, uint32)
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* \param [in] buffer the buffer from which fields are read from. Will be advanced at the end of the function call
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*/
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static void
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next_buffer_to_struct(void* struct_memb, size_t memb_size, bool req_endian, uint8_t** buffer)
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{
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memcpy(struct_memb, *buffer, memb_size);
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if (req_endian) switch (memb_size) {
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case 2:
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*(uint16_t*)(struct_memb) = mvhd_from_be16(*(uint16_t*)(struct_memb));
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break;
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case 4:
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*(uint32_t*)(struct_memb) = mvhd_from_be32(*(uint32_t*)(struct_memb));
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break;
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case 8:
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*(uint64_t*)(struct_memb) = mvhd_from_be64(*(uint64_t*)(struct_memb));
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break;
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}
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*buffer += memb_size;
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}
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/**
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* \brief Save a struct member into a buffer, converting endian if necessary
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*
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* \param [in] struct_memb struct member read from
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* \param [in] memb_size the size of struct_memb, in bytes
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* \param [in] req_endian is the field a value that requires endian conversion (eg: uint16, uint32)
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* \param [out] buffer the buffer from which struct member is saved to. Will be advanced at the end of the function call
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*/
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static void
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next_struct_to_buffer(void* struct_memb, size_t memb_size, bool req_endian, uint8_t** buffer)
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{
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uint8_t *buf_ptr = *buffer;
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memcpy(buf_ptr, struct_memb, memb_size);
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if (req_endian) switch (memb_size) {
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case 2:
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*((uint16_t*)buf_ptr) = mvhd_to_be16(*(uint16_t*)(struct_memb));
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break;
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case 4:
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*((uint32_t*)buf_ptr) = mvhd_to_be32(*(uint32_t*)(struct_memb));
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break;
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case 8:
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*((uint64_t*)buf_ptr) = mvhd_to_be64(*(uint64_t*)(struct_memb));
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break;
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}
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buf_ptr += memb_size;
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*buffer = buf_ptr;
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}
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void
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mvhd_buffer_to_footer(MVHDFooter* footer, uint8_t* buffer)
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{
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uint8_t* buff_ptr = buffer;
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next_buffer_to_struct(&footer->cookie, sizeof footer->cookie, false, &buff_ptr);
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next_buffer_to_struct(&footer->features, sizeof footer->features, true, &buff_ptr);
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next_buffer_to_struct(&footer->fi_fmt_vers, sizeof footer->fi_fmt_vers, true, &buff_ptr);
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next_buffer_to_struct(&footer->data_offset, sizeof footer->data_offset, true, &buff_ptr);
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next_buffer_to_struct(&footer->timestamp, sizeof footer->timestamp, true, &buff_ptr);
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next_buffer_to_struct(&footer->cr_app, sizeof footer->cr_app, false, &buff_ptr);
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next_buffer_to_struct(&footer->cr_vers, sizeof footer->cr_vers, true, &buff_ptr);
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next_buffer_to_struct(&footer->cr_host_os, sizeof footer->cr_host_os, false, &buff_ptr);
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next_buffer_to_struct(&footer->orig_sz, sizeof footer->orig_sz, true, &buff_ptr);
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next_buffer_to_struct(&footer->curr_sz, sizeof footer->curr_sz, true, &buff_ptr);
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next_buffer_to_struct(&footer->geom.cyl, sizeof footer->geom.cyl, true, &buff_ptr);
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next_buffer_to_struct(&footer->geom.heads, sizeof footer->geom.heads, false, &buff_ptr);
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next_buffer_to_struct(&footer->geom.spt, sizeof footer->geom.spt, false, &buff_ptr);
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next_buffer_to_struct(&footer->disk_type, sizeof footer->disk_type, true, &buff_ptr);
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next_buffer_to_struct(&footer->checksum, sizeof footer->checksum, true, &buff_ptr);
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next_buffer_to_struct(&footer->uuid, sizeof footer->uuid, false, &buff_ptr);
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next_buffer_to_struct(&footer->saved_st, sizeof footer->saved_st, false, &buff_ptr);
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next_buffer_to_struct(&footer->reserved, sizeof footer->reserved, false, &buff_ptr);
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}
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void
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mvhd_footer_to_buffer(MVHDFooter* footer, uint8_t* buffer)
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{
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uint8_t* buff_ptr = buffer;
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next_struct_to_buffer(&footer->cookie, sizeof footer->cookie, false, &buff_ptr);
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next_struct_to_buffer(&footer->features, sizeof footer->features, true, &buff_ptr);
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next_struct_to_buffer(&footer->fi_fmt_vers, sizeof footer->fi_fmt_vers, true, &buff_ptr);
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next_struct_to_buffer(&footer->data_offset, sizeof footer->data_offset, true, &buff_ptr);
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next_struct_to_buffer(&footer->timestamp, sizeof footer->timestamp, true, &buff_ptr);
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next_struct_to_buffer(&footer->cr_app, sizeof footer->cr_app, false, &buff_ptr);
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next_struct_to_buffer(&footer->cr_vers, sizeof footer->cr_vers, true, &buff_ptr);
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next_struct_to_buffer(&footer->cr_host_os, sizeof footer->cr_host_os, false, &buff_ptr);
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next_struct_to_buffer(&footer->orig_sz, sizeof footer->orig_sz, true, &buff_ptr);
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next_struct_to_buffer(&footer->curr_sz, sizeof footer->curr_sz, true, &buff_ptr);
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next_struct_to_buffer(&footer->geom.cyl, sizeof footer->geom.cyl, true, &buff_ptr);
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next_struct_to_buffer(&footer->geom.heads, sizeof footer->geom.heads, false, &buff_ptr);
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next_struct_to_buffer(&footer->geom.spt, sizeof footer->geom.spt, false, &buff_ptr);
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next_struct_to_buffer(&footer->disk_type, sizeof footer->disk_type, true, &buff_ptr);
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next_struct_to_buffer(&footer->checksum, sizeof footer->checksum, true, &buff_ptr);
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next_struct_to_buffer(&footer->uuid, sizeof footer->uuid, false, &buff_ptr);
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next_struct_to_buffer(&footer->saved_st, sizeof footer->saved_st, false, &buff_ptr);
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next_struct_to_buffer(&footer->reserved, sizeof footer->reserved, false, &buff_ptr);
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}
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void
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mvhd_buffer_to_header(MVHDSparseHeader* header, uint8_t* buffer)
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{
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uint8_t* buff_ptr = buffer;
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next_buffer_to_struct(&header->cookie, sizeof header->cookie, false, &buff_ptr);
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next_buffer_to_struct(&header->data_offset, sizeof header->data_offset, true, &buff_ptr);
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next_buffer_to_struct(&header->bat_offset, sizeof header->bat_offset, true, &buff_ptr);
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next_buffer_to_struct(&header->head_vers, sizeof header->head_vers, true, &buff_ptr);
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next_buffer_to_struct(&header->max_bat_ent, sizeof header->max_bat_ent, true, &buff_ptr);
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next_buffer_to_struct(&header->block_sz, sizeof header->block_sz, true, &buff_ptr);
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next_buffer_to_struct(&header->checksum, sizeof header->checksum, true, &buff_ptr);
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next_buffer_to_struct(&header->par_uuid, sizeof header->par_uuid, false, &buff_ptr);
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next_buffer_to_struct(&header->par_timestamp, sizeof header->par_timestamp, true, &buff_ptr);
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next_buffer_to_struct(&header->reserved_1, sizeof header->reserved_1, true, &buff_ptr);
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next_buffer_to_struct(&header->par_utf16_name, sizeof header->par_utf16_name, false, &buff_ptr);
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for (int i = 0; i < 8; i++) {
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next_buffer_to_struct(&header->par_loc_entry[i].plat_code, sizeof header->par_loc_entry[i].plat_code, true, &buff_ptr);
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next_buffer_to_struct(&header->par_loc_entry[i].plat_data_space, sizeof header->par_loc_entry[i].plat_data_space, true, &buff_ptr);
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next_buffer_to_struct(&header->par_loc_entry[i].plat_data_len, sizeof header->par_loc_entry[i].plat_data_len, true, &buff_ptr);
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next_buffer_to_struct(&header->par_loc_entry[i].reserved, sizeof header->par_loc_entry[i].reserved, true, &buff_ptr);
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next_buffer_to_struct(&header->par_loc_entry[i].plat_data_offset, sizeof header->par_loc_entry[i].plat_data_offset, true, &buff_ptr);
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}
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next_buffer_to_struct(&header->reserved_2, sizeof header->reserved_2, false, &buff_ptr);
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}
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void
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mvhd_header_to_buffer(MVHDSparseHeader* header, uint8_t* buffer)
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{
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uint8_t* buff_ptr = buffer;
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next_struct_to_buffer(&header->cookie, sizeof header->cookie, false, &buff_ptr);
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next_struct_to_buffer(&header->data_offset, sizeof header->data_offset, true, &buff_ptr);
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next_struct_to_buffer(&header->bat_offset, sizeof header->bat_offset, true, &buff_ptr);
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next_struct_to_buffer(&header->head_vers, sizeof header->head_vers, true, &buff_ptr);
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next_struct_to_buffer(&header->max_bat_ent, sizeof header->max_bat_ent, true, &buff_ptr);
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next_struct_to_buffer(&header->block_sz, sizeof header->block_sz, true, &buff_ptr);
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next_struct_to_buffer(&header->checksum, sizeof header->checksum, true, &buff_ptr);
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next_struct_to_buffer(&header->par_uuid, sizeof header->par_uuid, false, &buff_ptr);
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next_struct_to_buffer(&header->par_timestamp, sizeof header->par_timestamp, true, &buff_ptr);
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next_struct_to_buffer(&header->reserved_1, sizeof header->reserved_1, true, &buff_ptr);
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next_struct_to_buffer(&header->par_utf16_name, sizeof header->par_utf16_name, false, &buff_ptr);
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for (int i = 0; i < 8; i++) {
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next_struct_to_buffer(&header->par_loc_entry[i].plat_code, sizeof header->par_loc_entry[i].plat_code, true, &buff_ptr);
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next_struct_to_buffer(&header->par_loc_entry[i].plat_data_space, sizeof header->par_loc_entry[i].plat_data_space, true, &buff_ptr);
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next_struct_to_buffer(&header->par_loc_entry[i].plat_data_len, sizeof header->par_loc_entry[i].plat_data_len, true, &buff_ptr);
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next_struct_to_buffer(&header->par_loc_entry[i].reserved, sizeof header->par_loc_entry[i].reserved, true, &buff_ptr);
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next_struct_to_buffer(&header->par_loc_entry[i].plat_data_offset, sizeof header->par_loc_entry[i].plat_data_offset, true, &buff_ptr);
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}
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next_struct_to_buffer(&header->reserved_2, sizeof header->reserved_2, false, &buff_ptr);
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}
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