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https://gitlab.com/xCrystal/pokecrystal-board.git
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Don't hardcode CRCs within Crystal base data
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parent
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commit
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@ -1,9 +1,9 @@
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#include <stdio.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <getopt.h>
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#include <string.h>
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#include <string.h>
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#include <stdint.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <getopt.h>
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#include "common.h"
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#include "common.h"
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@ -17,24 +17,28 @@
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#define HEADERSIZE (N64PS3SIZE + 2)
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#define HEADERSIZE (N64PS3SIZE + 2)
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// Checksum every half-bank
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// Checksum every half-bank
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#define CHECKSIZE 0x2000
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#define CHECKSIZE 0x2000
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// The CRC initial value (also used for checksums)
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#define CRC_INIT 0xFEFE
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// The CRC polynomial value
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// The CRC polynomial value
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#define CRC_POLY 0xC387
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#define CRC_POLY 0xC387
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// The CRC initial value (also used for checksums)
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#define CRC_INIT 0xFEFE
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// The CRC initial value for Crystal base data
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#define CRC_INIT_BASE 0xACDE
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typedef enum Base { BASE_NONE, BASE_US, BASE_EU, BASE_DEBUG } Base;
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typedef enum Base { BASE_NONE, BASE_US, BASE_EU, BASE_DEBUG } Base;
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uint8_t us_base[BASESIZE] = {'b', 'a', 's', 'e',
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// Base data format: "base", 1, version, CRC (big-endian), 16 unknown bytes
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0x01, 0x00, 0xBF, 0x6B, 0x40, 0x11, 0x00, 0x22, 0x00, 0x3A,
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0xF3, 0x38, 0x18, 0xFF, 0xFF, 0x0F, 0x07, 0x10, 0x68, 0x07};
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uint8_t eu_base[BASESIZE] = {'b', 'a', 's', 'e',
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uint8_t us_base[BASESIZE] = {'b', 'a', 's', 'e', 1, 0, 0, 0,
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0x01, 0x01, 0x1E, 0xCF, 0x00, 0x10, 0x00, 0x00, 0x00, 0x0C,
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0x40, 0x11, 0x00, 0x22, 0x00, 0x3A, 0xF3, 0x38,
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0xA3, 0x38, 0x00, 0xFF, 0xFF, 0x07, 0x00, 0x00, 0x00, 0x14};
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0x18, 0xFF, 0xFF, 0x0F, 0x07, 0x10, 0x68, 0x07};
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uint8_t dbg_base[BASESIZE] = {'b', 'a', 's', 'e',
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uint8_t eu_base[BASESIZE] = {'b', 'a', 's', 'e', 1, 1, 0, 0,
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0x01, 0x00, 0x07, 0x82, 0x40, 0x10, 0x00, 0x22, 0x00, 0x3A,
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0x00, 0x10, 0x00, 0x00, 0x00, 0x0C, 0xA3, 0x38,
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0xE3, 0x38, 0x00, 0xFF, 0xFF, 0x07, 0x07, 0x10, 0x68, 0x06};
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0x00, 0xFF, 0xFF, 0x07, 0x00, 0x00, 0x00, 0x14};
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uint8_t dbg_base[BASESIZE] = {'b', 'a', 's', 'e', 1, 0, 0, 0,
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0x40, 0x10, 0x00, 0x22, 0x00, 0x3A, 0xE3, 0x38,
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0x00, 0xFF, 0xFF, 0x07, 0x07, 0x10, 0x68, 0x06};
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uint8_t n64ps3[N64PS3SIZE] = {'N', '6', '4', 'P', 'S', '3'};
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uint8_t n64ps3[N64PS3SIZE] = {'N', '6', '4', 'P', 'S', '3'};
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@ -81,6 +85,18 @@ void calculate_checksums(uint8_t *file, int filesize, Base base) {
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int DATASIZE = HEADERSIZE + NUMCHECKS * 2; // 2 bytes per checksum
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int DATASIZE = HEADERSIZE + NUMCHECKS * 2; // 2 bytes per checksum
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int ORIGIN = filesize - DATASIZE; // Stadium data goes at the end of the file
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int ORIGIN = filesize - DATASIZE; // Stadium data goes at the end of the file
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// Initialize the CRC table
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uint16_t crc_table[256];
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for (int i = 0; i < 256; i++) {
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uint16_t c = i;
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uint16_t rem = 0;
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for (int y = 0; y < 8; y++) {
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rem = (rem >> 1) ^ ((rem ^ c) & 1 ? CRC_POLY : 0);
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c >>= 1;
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}
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crc_table[i] = rem;
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}
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// Clear the global checksum
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// Clear the global checksum
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SET_U16BE(file, GLOBALOFF, 0);
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SET_U16BE(file, GLOBALOFF, 0);
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@ -94,6 +110,15 @@ void calculate_checksums(uint8_t *file, int filesize, Base base) {
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memcpy(file + BASEOFF, dbg_base, BASESIZE);
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memcpy(file + BASEOFF, dbg_base, BASESIZE);
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}
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}
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// Calculate the CRC of the base data, or none
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if (base) {
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uint16_t crc = CRC_INIT_BASE;
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for (int i = BASEOFF; i < BASEOFF + BASESIZE; i++) {
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crc = (crc >> 8) ^ crc_table[(crc & 0xFF) ^ file[i]];
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}
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SET_U16BE(file, BASEOFF + 6, crc);
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}
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// Initialize the Stadium data (this should be free space anyway)
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// Initialize the Stadium data (this should be free space anyway)
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memset(file + ORIGIN, 0, DATASIZE);
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memset(file + ORIGIN, 0, DATASIZE);
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memcpy(file + ORIGIN, n64ps3, N64PS3SIZE);
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memcpy(file + ORIGIN, n64ps3, N64PS3SIZE);
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@ -107,18 +132,6 @@ void calculate_checksums(uint8_t *file, int filesize, Base base) {
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SET_U16BE(file, ORIGIN + HEADERSIZE + i * 2, checksum);
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SET_U16BE(file, ORIGIN + HEADERSIZE + i * 2, checksum);
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}
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}
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// Initialize the CRC table
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uint16_t crc_table[256];
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for (int i = 0; i < 256; i++) {
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uint16_t c = i;
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uint16_t rem = 0;
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for (int y = 0; y < 8; y++) {
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rem = (rem >> 1) ^ ((rem ^ c) & 1 ? CRC_POLY : 0);
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c >>= 1;
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}
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crc_table[i] = rem;
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}
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// Calculate the CRC of the half-bank checksums
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// Calculate the CRC of the half-bank checksums
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uint16_t crc = CRC_INIT;
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uint16_t crc = CRC_INIT;
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for (int i = ORIGIN + HEADERSIZE; i < ORIGIN + DATASIZE; i++) {
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for (int i = ORIGIN + HEADERSIZE; i < ORIGIN + DATASIZE; i++) {
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