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AmigaROMUtil.c
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AmigaROMUtil.c
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/*
MIT License
Copyright (c) 2021 Christopher Gelatt
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include "AmigaROMUtil.h"
#include "AmigaROMHashes.h"
#include "AmigaROMMajorMinorVersions.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if defined(__APPLE__) && defined(__MACH__)
#include <libkern/OSByteOrder.h>
#define htobe16(x) OSSwapHostToBigInt16(x)
#define be16toh(x) OSSwapBigToHostInt16(x)
#define htobe32(x) OSSwapHostToBigInt32(x)
#define be32toh(x) OSSwapBigToHostInt32(x)
#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
#include <sys/endian.h>
#elif defined(__OpenBSD__)
#include <sys/endian.h>
#define be16toh(x) betoh16(x)
#define be32toh(x) betoh32(x)
#elif defined(__linux__) || defined(__CYGWIN__)
#include <endian.h>
#elif defined(_WIN32) || defined(_WIN64)
#if !defined(_M_ARM) && !defined(_M_ARM64)
#if defined(_MSC_VER)
#include <stdlib.h>
#define htobe16(x) _byteswap_ushort(x)
#define be16toh(x) _byteswap_ushort(x)
#define htobe32(x) _byteswap_ulong(x)
#define be32toh(x) _byteswap_ulong(x)
#elif defined(__GNUC__) || defined(__clang__) // Compiler (Windows, Intel)
#define htobe16(x) __builtin_bswap16(x)
#define be16toh(x) __builtin_bswap16(x)
#define htobe32(x) __builtin_bswap32(x)
#define be32toh(x) __builtin_bswap32(x)
#endif // Compiler (Windows, Intel)
#else // Architecture (Windows, ARM)
#define htobe16(x) (x)
#define be16toh(x) (x)
#define htobe32(x) (x)
#define be32toh(x) (x)
#endif // Architecture (Windows)
#endif // Platform
#define AMIGA_256_ROM_HEADER 0x11114EF9
#define AMIGA_256_ROM_HEADER_BYTESWAP 0x1111F94E
#define AMIGA_512_ROM_HEADER 0x11144EF9
#define AMIGA_512_ROM_HEADER_BYTESWAP 0x1411F94E
#define AMIGA_EXT_ROM_HEADER 0x11144EF9
#define AMIGA_EXT_ROM_HEADER_BYTESWAP 0x1411F94E
#define AMIGA_512_REKICK_ROM_HEADER 0x11164EF9 //TODO: Properly detect size/handle these
#define AMIGA_512_REKICK_ROM_HEADER_BYTESWAP 0x1611F94E //TODO: Properly detect size/handle these
extern int sha1digest(uint8_t *digest, char *hexdigest, const uint8_t *data, size_t databytes);
// Create and return a new and initialized struct.
// Pointers are NOT allocated, but are NULL instead.
ParsedAmigaROMData GetInitializedAmigaROM(void)
{
ParsedAmigaROMData amiga_rom;
amiga_rom.is_initialized = true;
amiga_rom.parsed_rom = false;
amiga_rom.rom_data = NULL;
amiga_rom.rom_size = 0;
amiga_rom.validated_size = false;
amiga_rom.has_reset_vector = false;
amiga_rom.is_encrypted = false;
amiga_rom.can_decrypt = false;
amiga_rom.successfully_decrypted = false;
amiga_rom.is_byte_swapped = false;
amiga_rom.has_valid_checksum = false;
amiga_rom.header = 0;
amiga_rom.type = 'U';
amiga_rom.version = NULL;
amiga_rom.major_version = 0;
amiga_rom.minor_version = 0xffff;
amiga_rom.major_minor_version = NULL;
amiga_rom.is_kickety_split = false;
amiga_rom.valid_footer = false;
return amiga_rom;
}
// Free all pointers which are expected to potentially be
// allocated in a struct and sets the pointers to NULL,
// and sets the rest of the struct to default values.
void DestroyInitializedAmigaROM(ParsedAmigaROMData *amiga_rom)
{
amiga_rom->is_initialized = false;
amiga_rom->parsed_rom = false;
if(amiga_rom->rom_data)
{
free(amiga_rom->rom_data);
amiga_rom->rom_data = NULL;
}
amiga_rom->rom_size = 0;
amiga_rom->validated_size = false;
amiga_rom->has_reset_vector = false;
amiga_rom->is_encrypted = false;
amiga_rom->can_decrypt = false;
amiga_rom->successfully_decrypted = false;
amiga_rom->is_byte_swapped = false;
amiga_rom->has_valid_checksum = false;
amiga_rom->header = 0;
amiga_rom->type = 'U';
amiga_rom->version = NULL;
amiga_rom->major_version = 0;
amiga_rom->minor_version = 0xffff;
amiga_rom->major_minor_version = NULL;
amiga_rom->is_kickety_split = false;
amiga_rom->valid_footer = false;
}
// Returns a parsed ROM data struct, with the ROM data and size included.
// If anything files, parsed_rom will be false. If encrypted, the ROM
// will be decrypted.
ParsedAmigaROMData ReadAmigaROM(const char *rom_file_path, const char *keyfile_path)
{
FILE *fp;
ParsedAmigaROMData amiga_rom = GetInitializedAmigaROM();
int seek_status;
if(!rom_file_path)
{
return amiga_rom;
}
fp = fopen(rom_file_path, "rb");
if(!fp)
{
return amiga_rom;
}
seek_status = fseek(fp, 0, SEEK_END);
if(seek_status < 0)
{
return amiga_rom;
}
else
{
amiga_rom.rom_size = (size_t)ftell(fp);
fseek(fp, 0, SEEK_SET);
}
amiga_rom.rom_data = (uint8_t*)malloc(amiga_rom.rom_size);
if(!amiga_rom.rom_data)
{
return amiga_rom;
}
fread(amiga_rom.rom_data, 1, amiga_rom.rom_size, fp);
fclose(fp);
ParseAmigaROMData(&amiga_rom, keyfile_path);
if(amiga_rom.parsed_rom)
{
if(amiga_rom.is_encrypted && amiga_rom.can_decrypt)
{
if(CryptAmigaROM(&amiga_rom, false, keyfile_path))
{
amiga_rom.successfully_decrypted = true;
}
}
}
return amiga_rom;
}
// Detect whether a ROM is an Amiga kickstart ROM based on size, header, reset vector,
// magic, and footer.
bool IsAmigaROM(const ParsedAmigaROMData *amiga_rom)
{
if(DetectAmigaKickstartROMTypeFromHeader(amiga_rom) == 0)
{
return false;
}
if(!ValidateAmigaROMResetVector(amiga_rom))
{
return false;
}
if(!ValidateAmigaKickstartROMFooter(amiga_rom))
{
return false;
}
return true;
}
// Puts ROM info data into output_string
void PrintAmigaROMInfo(const ParsedAmigaROMData *amiga_rom, char *output_string, const size_t string_length)
{
char *successfully_parsed = NULL;
char *rom_size_validated = NULL;
char *has_reset_vector = NULL;
char *rom_is_encrypted = NULL;
char *can_decrypt_rom = NULL;
char *successfully_decrypted_rom = NULL;
char *rom_is_byte_swapped = NULL;
char *rom_has_valid_checksum = NULL;
char *rom_header_info = NULL;
char *rom_type = NULL;
char *rom_version = NULL;
char *embedded_rom_major_version = NULL;
char *embedded_rom_minor_version = NULL;
char *detected_embedded_rom_version = NULL;
char *is_kickety_split = NULL;
char *has_valid_footer = NULL;
if(!amiga_rom || !output_string)
{
return;
}
successfully_parsed = (char *)malloc(64);
if(!successfully_parsed)
{
return;
}
snprintf(successfully_parsed, 64, "Successfully parsed:\t\t%d", amiga_rom->parsed_rom);
rom_size_validated = (char *)malloc(64);
if(!rom_size_validated)
{
free(successfully_parsed);
successfully_parsed = NULL;
return;
}
snprintf(rom_size_validated, 64, "ROM size validated:\t\t%d", amiga_rom->validated_size);
has_reset_vector = (char *)malloc(64);
if(!has_reset_vector)
{
free(successfully_parsed);
successfully_parsed = NULL;
free(rom_size_validated);
rom_size_validated = NULL;
return;
}
snprintf(has_reset_vector, 64, "Has reset vector:\t\t%d", amiga_rom->has_reset_vector);
rom_is_encrypted = (char *)malloc(64);
if(!rom_is_encrypted)
{
free(successfully_parsed);
successfully_parsed = NULL;
free(rom_size_validated);
rom_size_validated = NULL;
free(has_reset_vector);
has_reset_vector = NULL;
return;
}
snprintf(rom_is_encrypted, 64, "ROM is encrypted:\t\t%d", amiga_rom->is_encrypted);
can_decrypt_rom = (char *)malloc(64);
if(!can_decrypt_rom)
{
free(successfully_parsed);
successfully_parsed = NULL;
free(rom_size_validated);
rom_size_validated = NULL;
free(has_reset_vector);
has_reset_vector = NULL;
free(rom_is_encrypted);
rom_is_encrypted = NULL;
return;
}
snprintf(can_decrypt_rom, 64, "Can decrypt ROM:\t\t%d", amiga_rom->can_decrypt);
successfully_decrypted_rom = (char *)malloc(64);
if(!successfully_decrypted_rom)
{
free(successfully_parsed);
successfully_parsed = NULL;
free(rom_size_validated);
rom_size_validated = NULL;
free(has_reset_vector);
has_reset_vector = NULL;
free(rom_is_encrypted);
rom_is_encrypted = NULL;
free(can_decrypt_rom);
can_decrypt_rom = NULL;
return;
}
snprintf(successfully_decrypted_rom, 64, "Successfully decrypted ROM:\t%d", amiga_rom->successfully_decrypted);
rom_is_byte_swapped = (char *)malloc(64);
if(!rom_is_byte_swapped)
{
free(successfully_parsed);
successfully_parsed = NULL;
free(rom_size_validated);
rom_size_validated = NULL;
free(has_reset_vector);
has_reset_vector = NULL;
free(rom_is_encrypted);
rom_is_encrypted = NULL;
free(can_decrypt_rom);
can_decrypt_rom = NULL;
free(successfully_decrypted_rom);
successfully_decrypted_rom = NULL;
return;
}
snprintf(rom_is_byte_swapped, 64, "ROM is byte swapped:\t\t%d", amiga_rom->is_byte_swapped);
rom_has_valid_checksum = (char *)malloc(64);
if(!rom_has_valid_checksum)
{
free(successfully_parsed);
successfully_parsed = NULL;
free(rom_size_validated);
rom_size_validated = NULL;
free(has_reset_vector);
has_reset_vector = NULL;
free(rom_is_encrypted);
rom_is_encrypted = NULL;
free(can_decrypt_rom);
can_decrypt_rom = NULL;
free(successfully_decrypted_rom);
successfully_decrypted_rom = NULL;
free(rom_is_byte_swapped);
rom_is_byte_swapped = NULL;
return;
}
snprintf(rom_has_valid_checksum, 64, "ROM has a valid checksum:\t%d", amiga_rom->has_valid_checksum);
rom_header_info = (char *)malloc(64);
if(!rom_header_info)
{
free(successfully_parsed);
successfully_parsed = NULL;
free(rom_size_validated);
rom_size_validated = NULL;
free(has_reset_vector);
has_reset_vector = NULL;
free(rom_is_encrypted);
rom_is_encrypted = NULL;
free(can_decrypt_rom);
can_decrypt_rom = NULL;
free(successfully_decrypted_rom);
successfully_decrypted_rom = NULL;
free(rom_is_byte_swapped);
rom_is_byte_swapped = NULL;
free(rom_has_valid_checksum);
rom_has_valid_checksum = NULL;
return;
}
switch(amiga_rom->header)
{
case 0:
snprintf(rom_header_info, 64, "ROM type indicated by header:\tNot an Amiga ROM");
break;
case 1:
snprintf(rom_header_info, 64, "ROM type indicated by header:\t256KB Kickstart ROM");
break;
case 2:
snprintf(rom_header_info, 64, "ROM type indicated by header:\t512KB Kickstart ROM");
break;
case 3:
snprintf(rom_header_info, 64, "ROM type indicated by header:\tExtended ROM");
break;
case 4:
snprintf(rom_header_info, 64, "ROM type indicated by header:\t\"ReKick\" ROM");
break;
case 5:
snprintf(rom_header_info, 64, "ROM type indicated by header:\tAmbiguous");
break;
default:
snprintf(rom_header_info, 64, "ROM type indicated by header:\tUnknown");
break;
}
rom_type = (char *)malloc(64);
if(!rom_type)
{
free(successfully_parsed);
successfully_parsed = NULL;
free(rom_size_validated);
rom_size_validated = NULL;
free(has_reset_vector);
has_reset_vector = NULL;
free(rom_is_encrypted);
rom_is_encrypted = NULL;
free(can_decrypt_rom);
can_decrypt_rom = NULL;
free(successfully_decrypted_rom);
successfully_decrypted_rom = NULL;
free(rom_is_byte_swapped);
rom_is_byte_swapped = NULL;
free(rom_has_valid_checksum);
rom_has_valid_checksum = NULL;
free(rom_header_info);
rom_header_info = NULL;
return;
}
switch(amiga_rom->type)
{
case 'A':
snprintf(rom_type, 64, "ROM type:\t\t\tKickstart Hi ROM");
break;
case 'B':
snprintf(rom_type, 64, "ROM type:\t\t\tKickstart Lo ROM");
break;
case 'E':
snprintf(rom_type, 64, "ROM type:\t\t\tExtended Amiga ROM");
break;
case 'M':
snprintf(rom_type, 64, "ROM type:\t\t\tMerged Kickstart ROM");
break;
case 'O':
snprintf(rom_type, 64, "ROM type:\t\t\tNon-Kickstart Amiga ROM");
break;
case 'U':
default:
snprintf(rom_type, 64, "ROM type:\t\t\tUnknown ROM");
break;
}
rom_version = (char *)malloc(143);
if(!rom_version)
{
free(successfully_parsed);
successfully_parsed = NULL;
free(rom_size_validated);
rom_size_validated = NULL;
free(has_reset_vector);
has_reset_vector = NULL;
free(rom_is_encrypted);
rom_is_encrypted = NULL;
free(can_decrypt_rom);
can_decrypt_rom = NULL;
free(successfully_decrypted_rom);
successfully_decrypted_rom = NULL;
free(rom_is_byte_swapped);
rom_is_byte_swapped = NULL;
free(rom_has_valid_checksum);
rom_has_valid_checksum = NULL;
free(rom_header_info);
rom_header_info = NULL;
free(rom_type);
rom_type = NULL;
return;
}
snprintf(rom_version, 143, "ROM version:\t\t\t%s", amiga_rom->version);
embedded_rom_major_version = (char *)malloc(64);
if(!embedded_rom_major_version)
{
free(successfully_parsed);
successfully_parsed = NULL;
free(rom_size_validated);
rom_size_validated = NULL;
free(has_reset_vector);
has_reset_vector = NULL;
free(rom_is_encrypted);
rom_is_encrypted = NULL;
free(can_decrypt_rom);
can_decrypt_rom = NULL;
free(successfully_decrypted_rom);
successfully_decrypted_rom = NULL;
free(rom_is_byte_swapped);
rom_is_byte_swapped = NULL;
free(rom_has_valid_checksum);
rom_has_valid_checksum = NULL;
free(rom_header_info);
rom_header_info = NULL;
free(rom_type);
rom_type = NULL;
free(rom_version);
rom_version = NULL;
return;
}
if(amiga_rom->major_version != 0xffff)
{
snprintf(embedded_rom_major_version, 64, "ROM major version number:\t%u", amiga_rom->major_version);
}
else
{
snprintf(embedded_rom_major_version, 64, "ROM major version number:\tUnknown");
}
embedded_rom_minor_version = (char *)malloc(64);
if(!embedded_rom_minor_version)
{
free(successfully_parsed);
successfully_parsed = NULL;
free(rom_size_validated);
rom_size_validated = NULL;
free(has_reset_vector);
has_reset_vector = NULL;
free(rom_is_encrypted);
rom_is_encrypted = NULL;
free(can_decrypt_rom);
can_decrypt_rom = NULL;
free(successfully_decrypted_rom);
successfully_decrypted_rom = NULL;
free(rom_is_byte_swapped);
rom_is_byte_swapped = NULL;
free(rom_has_valid_checksum);
rom_has_valid_checksum = NULL;
free(rom_header_info);
rom_header_info = NULL;
free(rom_type);
rom_type = NULL;
free(rom_version);
rom_version = NULL;
free(embedded_rom_major_version);
embedded_rom_major_version = NULL;
return;
}
if(amiga_rom->minor_version != 0xffff)
{
snprintf(embedded_rom_minor_version, 64, "ROM minor version number:\t%u", amiga_rom->minor_version);
}
else
{
snprintf(embedded_rom_minor_version, 64, "ROM minor version number:\tN/A");
}
detected_embedded_rom_version = (char *)malloc(157);
if(!detected_embedded_rom_version)
{
free(successfully_parsed);
successfully_parsed = NULL;
free(rom_size_validated);
rom_size_validated = NULL;
free(has_reset_vector);
has_reset_vector = NULL;
free(rom_is_encrypted);
rom_is_encrypted = NULL;
free(can_decrypt_rom);
can_decrypt_rom = NULL;
free(successfully_decrypted_rom);
successfully_decrypted_rom = NULL;
free(rom_is_byte_swapped);
rom_is_byte_swapped = NULL;
free(rom_has_valid_checksum);
rom_has_valid_checksum = NULL;
free(rom_header_info);
rom_header_info = NULL;
free(rom_type);
rom_type = NULL;
free(rom_version);
rom_version = NULL;
free(embedded_rom_major_version);
embedded_rom_major_version = NULL;
free(embedded_rom_minor_version);
embedded_rom_minor_version = NULL;
return;
}
snprintf(detected_embedded_rom_version, 157, "ROM detected version number:\t%s", amiga_rom->major_minor_version);
is_kickety_split = (char *)malloc(64);
if(!is_kickety_split)
{
free(successfully_parsed);
successfully_parsed = NULL;
free(rom_size_validated);
rom_size_validated = NULL;
free(has_reset_vector);
has_reset_vector = NULL;
free(rom_is_encrypted);
rom_is_encrypted = NULL;
free(can_decrypt_rom);
can_decrypt_rom = NULL;
free(successfully_decrypted_rom);
successfully_decrypted_rom = NULL;
free(rom_is_byte_swapped);
rom_is_byte_swapped = NULL;
free(rom_has_valid_checksum);
rom_has_valid_checksum = NULL;
free(rom_header_info);
rom_header_info = NULL;
free(rom_type);
rom_type = NULL;
free(rom_version);
rom_version = NULL;
free(embedded_rom_major_version);
embedded_rom_major_version = NULL;
free(embedded_rom_minor_version);
embedded_rom_minor_version = NULL;
free(detected_embedded_rom_version);
detected_embedded_rom_version = NULL;
return;
}
snprintf(is_kickety_split, 64, "ROM kickety split status:\t%d", amiga_rom->is_kickety_split);
has_valid_footer = (char *)malloc(64);
if(!has_valid_footer)
{
free(successfully_parsed);
successfully_parsed = NULL;
free(rom_size_validated);
rom_size_validated = NULL;
free(has_reset_vector);
has_reset_vector = NULL;
free(rom_is_encrypted);
rom_is_encrypted = NULL;
free(can_decrypt_rom);
can_decrypt_rom = NULL;
free(successfully_decrypted_rom);
successfully_decrypted_rom = NULL;
free(rom_is_byte_swapped);
rom_is_byte_swapped = NULL;
free(rom_has_valid_checksum);
rom_has_valid_checksum = NULL;
free(rom_header_info);
rom_header_info = NULL;
free(rom_type);
rom_type = NULL;
free(rom_version);
rom_version = NULL;
free(embedded_rom_major_version);
embedded_rom_major_version = NULL;
free(embedded_rom_minor_version);
embedded_rom_minor_version = NULL;
free(detected_embedded_rom_version);
detected_embedded_rom_version = NULL;
free(is_kickety_split);
is_kickety_split = NULL;
return;
}
snprintf(has_valid_footer, 64, "ROM has valid footer:\t\t%d", amiga_rom->valid_footer);
snprintf(output_string, string_length, "ROM Info:\n\n");
snprintf(output_string, string_length, "%s%s\n", output_string, successfully_parsed);
snprintf(output_string, string_length, "%s%s\n", output_string, rom_size_validated);
snprintf(output_string, string_length, "%s%s\n", output_string, has_reset_vector);
snprintf(output_string, string_length, "%s%s\n", output_string, rom_is_encrypted);
snprintf(output_string, string_length, "%s%s\n", output_string, can_decrypt_rom);
snprintf(output_string, string_length, "%s%s\n", output_string, successfully_decrypted_rom);
snprintf(output_string, string_length, "%s%s\n", output_string, rom_is_byte_swapped);
snprintf(output_string, string_length, "%s%s\n", output_string, rom_has_valid_checksum);
snprintf(output_string, string_length, "%s%s\n", output_string, rom_header_info);
snprintf(output_string, string_length, "%s%s\n", output_string, rom_type);
snprintf(output_string, string_length, "%s%s\n", output_string, rom_version);
snprintf(output_string, string_length, "%s%s\n", output_string, embedded_rom_major_version);
snprintf(output_string, string_length, "%s%s\n", output_string, embedded_rom_minor_version);
snprintf(output_string, string_length, "%s%s\n", output_string, detected_embedded_rom_version);
snprintf(output_string, string_length, "%s%s\n", output_string, is_kickety_split);
snprintf(output_string, string_length, "%s%s\n", output_string, has_valid_footer);
free(successfully_parsed);
successfully_parsed = NULL;
free(rom_size_validated);
rom_size_validated = NULL;
free(has_reset_vector);
has_reset_vector = NULL;
free(rom_is_encrypted);
rom_is_encrypted = NULL;
free(can_decrypt_rom);
can_decrypt_rom = NULL;
free(successfully_decrypted_rom);
successfully_decrypted_rom = NULL;
free(rom_is_byte_swapped);
rom_is_byte_swapped = NULL;
free(rom_has_valid_checksum);
rom_has_valid_checksum = NULL;
free(rom_header_info);
rom_header_info = NULL;
free(rom_type);
rom_type = NULL;
free(rom_version);
rom_version = NULL;
free(embedded_rom_major_version);
embedded_rom_major_version = NULL;
free(embedded_rom_minor_version);
embedded_rom_minor_version = NULL;
free(detected_embedded_rom_version);
detected_embedded_rom_version = NULL;
free(is_kickety_split);
is_kickety_split = NULL;
free(has_valid_footer);
has_valid_footer = NULL;
}
// Parses and validates the data in the Amiga ROM updates the struct
// passed in with that data.
void ParseAmigaROMData(ParsedAmigaROMData *amiga_rom, const char* keyfile_path)
{
int rom_encryption_result = 0;
if(!amiga_rom || !(amiga_rom->rom_data) || amiga_rom->rom_size == 0)
{
return;
}
amiga_rom->parsed_rom = false;
amiga_rom->validated_size = false;
amiga_rom->has_reset_vector = false;
amiga_rom->is_byte_swapped = false;
amiga_rom->has_valid_checksum = false;
amiga_rom->header = 0;
amiga_rom->type = 'U';
amiga_rom->version = NULL;
amiga_rom->major_version = 0;
amiga_rom->minor_version = 0xffff;
amiga_rom->major_minor_version = NULL;
amiga_rom->is_kickety_split = false;
amiga_rom->valid_footer = false;
if(!ValidateAmigaROMSize(amiga_rom))
{
return;
}
rom_encryption_result = DetectAmigaROMEncryption(amiga_rom);
if(rom_encryption_result == -1)
{
return;
}
else
{
amiga_rom->is_encrypted = rom_encryption_result;
}
if(amiga_rom->is_encrypted)
{
if(!CryptAmigaROM(amiga_rom, false, keyfile_path))
{
amiga_rom->is_encrypted = true;
amiga_rom->can_decrypt = false;
amiga_rom->successfully_decrypted = false;
}
else
{
amiga_rom->is_encrypted = false;
amiga_rom->can_decrypt = false;
amiga_rom->successfully_decrypted = true;
}
}
if(!amiga_rom->is_encrypted)
{
amiga_rom->parsed_rom = true;
amiga_rom->validated_size = ValidateEmbeddedAmigaROMSize(amiga_rom);
amiga_rom->has_reset_vector = ValidateAmigaROMResetVector(amiga_rom);
amiga_rom->is_byte_swapped = (DetectAmigaROMByteSwap(amiga_rom) == 1);
amiga_rom->has_valid_checksum = ValidateAmigaROMChecksum(amiga_rom);
amiga_rom->header = DetectAmigaKickstartROMTypeFromHeader(amiga_rom);
amiga_rom->type = DetectAmigaROMType(amiga_rom);
amiga_rom->version = DetectAmigaROMVersion(amiga_rom);
amiga_rom->major_version = DetectAmigaMajorROMVersion(amiga_rom);
amiga_rom->minor_version = DetectAmigaMinorROMVersion(amiga_rom);
amiga_rom->major_minor_version = DetectAmigaMajorMinorROMVersion(amiga_rom);
amiga_rom->is_kickety_split = DetectKicketySplitAmigaROM(amiga_rom);
amiga_rom->valid_footer = ValidateAmigaKickstartROMFooter(amiga_rom);
}
}
// Return whether an Amiga ROM is a valid size, accounting for
// encryption, if it's there.
bool ValidateAmigaROMSize(const ParsedAmigaROMData *amiga_rom)
{
size_t actual_rom_size = DetectUnencryptedAmigaROMSize(amiga_rom);
return ((actual_rom_size > 10) && ((actual_rom_size & actual_rom_size - 1) == 0));
}
// Validate that there is a reset vector (0x0x4E70) at 0x000000D0.
// Returns true if there is, or false if there isn't.
bool ValidateAmigaROMResetVector(const ParsedAmigaROMData *amiga_rom)
{
const uint16_t *rom_data_16;
if(!amiga_rom || !(amiga_rom->rom_data) || amiga_rom->rom_size == 0)
{
return false;
}
rom_data_16 = (const uint16_t*)(amiga_rom->rom_data);
return (be16toh(rom_data_16[104]) == 0x4E70);
}
// Detects the version of the ROM by SHA1 hash
// Returns NULL for failure, else a string indicating the ROM version
const char* DetectAmigaROMVersion(const ParsedAmigaROMData *amiga_rom)
{
uint8_t *digest;
char *hexdigest;
size_t i;
size_t rom_quantity = sizeof(AMIGA_ROM_INFO) / sizeof(AmigaROMInfo);
if(!amiga_rom || !(amiga_rom->rom_data) || amiga_rom->rom_size == 0)
{
return NULL;
}
digest = (uint8_t*)malloc(20);
if(!digest)
{
return NULL;
}
hexdigest = (char*)malloc(41);
if(!hexdigest)
{
free(digest);
digest = NULL;
return NULL;
}
if (sha1digest(digest, hexdigest, amiga_rom->rom_data, amiga_rom->rom_size))
{
free(digest);
digest = NULL;
free(hexdigest);
hexdigest = NULL;
return NULL;
}
for (i = 0; i < rom_quantity; i++)
{
if (strncmp(hexdigest, AMIGA_ROM_INFO[i].sha1hash, 40) == 0)
{
free(digest);
digest = NULL;
free(hexdigest);
hexdigest = NULL;
return AMIGA_ROM_INFO[i].version;
}
}
free(digest);
digest = NULL;
free(hexdigest);
hexdigest = NULL;
return NULL;
}
// Detects the major version in the Amiga ROM header
// Returns 0 if the ROM is not detects as an Amiga ROM
uint16_t DetectAmigaMajorROMVersion(const ParsedAmigaROMData *amiga_rom)
{
const uint16_t *rom_data_16;
if(!amiga_rom || !(amiga_rom->rom_data) || amiga_rom->rom_size < 16)
{
return 0xffff;
}
if(!IsAmigaROM(amiga_rom))
{
return 0xffff;
}
rom_data_16 = (const uint16_t*)(amiga_rom->rom_data);
return be16toh(rom_data_16[6]);
}
// Detects the minor version in the Amiga ROM header
// Returns 0 if the ROM is not detects as an Amiga ROM
uint16_t DetectAmigaMinorROMVersion(const ParsedAmigaROMData *amiga_rom)
{
const uint16_t *rom_data_16;
if(!amiga_rom || !(amiga_rom->rom_data) || amiga_rom->rom_size < 16)
{
return 0xffff;
}
if(!IsAmigaROM(amiga_rom))
{
return 0xffff;
}
rom_data_16 = (const uint16_t*)(amiga_rom->rom_data);
return be16toh(rom_data_16[7]);
}
// Returns a version string based on the major and minor versions in the Amiga ROM header
// Returns NULL if the ROM is not detects as an Amiga ROM or the version is unknown
const char* DetectAmigaMajorMinorROMVersion(const ParsedAmigaROMData *amiga_rom)
{
size_t i, number_of_versions;
number_of_versions = sizeof(AMIGA_ROM_MAJOR_MINOR_VERSIONS) / sizeof(AmigaROMMajorMinorVersions);
for(i = 0; i < number_of_versions; i++)
{
if(AMIGA_ROM_MAJOR_MINOR_VERSIONS[i].major_version == DetectAmigaMajorROMVersion(amiga_rom))
{
if((AMIGA_ROM_MAJOR_MINOR_VERSIONS[i].minor_version == 0xffff) || (AMIGA_ROM_MAJOR_MINOR_VERSIONS[i].minor_version == DetectAmigaMinorROMVersion(amiga_rom)))
{
return AMIGA_ROM_MAJOR_MINOR_VERSIONS[i].version;
}
}
}
return NULL;
}
// Returns a character indicating the type of ROM detected based on the SHA1 hash
// Valid return values are:
// A - Kickstart Hi/U34 ROM
// B - Kickstart Lo/U35 ROM
// E - Extended Amiga ROM
// M - Kickstart merged ROM
// O - Other (non-Kickstart) ROM
// U - Unknown ROM
char DetectAmigaROMType(const ParsedAmigaROMData *amiga_rom)
{
uint8_t *digest;
char *hexdigest;
size_t i;
size_t rom_quantity = sizeof(AMIGA_ROM_INFO) / sizeof(AmigaROMInfo);
if(!amiga_rom || !(amiga_rom->rom_data) || amiga_rom->rom_size == 0)
{
return 'U';
}
digest = (uint8_t*)malloc(20);
if(!digest)
{
return 'U';
}
hexdigest = (char*)malloc(41);
if(!hexdigest)
{
free(digest);
digest = NULL;
return 'U';
}