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bank.hpp
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bank.hpp
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// Copyright 2019, SUZUKI PLAN (MIT license)
// VGS cartridge system (BANK) emulator
#ifndef INCLUDE_BANK_HPP
#define INCLUDE_BANK_HPP
using namespace VGS8;
class Bank
{
public:
void* prg[256];
void* chr[256];
void* bgm[256];
short* eff[256];
int bgmSize[256];
int effSize[256];
unsigned char pal[1024];
Bank(const void* rom, size_t size)
{
clear();
unsigned char* rp = (unsigned char*)rom;
if (size < 8) return;
if (strncmp((const char*)rp, "VGS8", 4)) return;
int idx = 4;
// 各バンクサイズを取得
unsigned char prgN = rp[idx++];
unsigned char chrN = rp[idx++];
unsigned char bgmN = rp[idx++];
unsigned char effN = rp[idx++];
// extract PRG banks
for (int i = 0; i < prgN; i++) {
int sz;
const size_t max = 0x4000; // 領域は常に16KB固定 (バンク切り替えを高速化することを優先)
memcpy(&sz, &rp[idx], 4);
idx += 4;
if (NULL != (prg[i] = malloc(max))) {
memset(prg[i], 0, max);
LZ4_decompress_safe((const char*)&rp[idx], (char*)prg[i], sz, max);
}
idx += sz;
}
// extract CHR banks
for (int i = 0; i < chrN; i++) {
int sz;
const size_t max = 0x4000; // 領域は常に16KB固定
memcpy(&sz, &rp[idx], 4);
idx += 4;
if (NULL != (chr[i] = malloc(max))) {
memset(chr[i], 0, max);
LZ4_decompress_safe((const char*)&rp[idx], (char*)chr[i], sz, max);
}
idx += sz;
}
// extract BGM banks
for (int i = 0; i < bgmN; i++) {
memcpy(&bgmSize[i], &rp[idx], 4);
idx += 4;
if (NULL != (bgm[i] = malloc(bgmSize[i]))) {
memcpy(bgm[i], &rp[idx], bgmSize[i]);
}
idx += bgmSize[i];
}
// extract EFF banks
for (int i = 0; i < effN; i++) {
memcpy(&effSize[i], &rp[idx], 4);
idx += 4;
if (NULL != (eff[i] = (short*)malloc(effSize[i]))) {
memcpy(eff[i], &rp[idx], effSize[i]);
}
idx += effSize[i];
effSize[i] /= 2;
}
// extract palette data
memcpy(pal, &rp[idx], 1024);
}
~Bank()
{
int i;
for (i = 0; i < 256; i++) {
if (prg[i]) free(prg[i]);
if (chr[i]) free(chr[i]);
if (bgm[i]) free(bgm[i]);
if (eff[i]) free(eff[i]);
}
clear();
}
private:
void clear()
{
memset(prg, 0, sizeof(prg));
memset(chr, 0, sizeof(chr));
memset(bgm, 0, sizeof(bgm));
memset(eff, 0, sizeof(eff));
}
};
#endif