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Introduce Dri class

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It caches the link table.
This commit is contained in:
kichikuou
2024-12-08 13:39:23 +09:00
parent f26ce11fd9
commit 48d780add6
14 changed files with 121 additions and 110 deletions
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src/sys/dri.cpp
+27 -47
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@@ -5,83 +5,63 @@
*/
#include "dri.h"
#include <memory>
#include <string.h>
#include "crc32.h"
#include "../fileio.h"
std::vector<uint8> dri_load(const char* file_name, int page)
void Dri::open(const char* file_name)
{
char tmp_name[20];
strcpy_s(tmp_name, sizeof(tmp_name), file_name);
link_table.clear();
fname = file_name;
fname[0] = 'A';
FILEIO* fio = new FILEIO();
// ページの位置を取得
tmp_name[0] = 'A';
if(!fio->Fopen(tmp_name, FILEIO_READ_BINARY)) {
delete fio;
return {};
}
auto fio = std::make_unique<FILEIO>();
if (!fio->Fopen(fname.c_str(), FILEIO_READ_BINARY))
return;
int link_sector = fio->Fgetc();
link_sector |= fio->Fgetc() << 8;
int data_sector = fio->Fgetc();
data_sector |= fio->Fgetc() << 8;
if(page > (data_sector - link_sector) * 128 - 1) {
// ページ番号不正
fio->Fclose();
delete fio;
link_table.resize((data_sector - link_sector) * 256);
fio->Fseek((link_sector - 1) * 256, FILEIO_SEEK_SET);
fio->Fread(link_table.data(), 256, data_sector - link_sector);
}
std::vector<uint8> Dri::load(int page)
{
if (static_cast<size_t>(page) >= link_table.size() / 2)
return {};
}
fio->Fseek((link_sector - 1) * 256 + (page - 1) * 2, FILEIO_SEEK_SET);
int disk_index = fio->Fgetc();
int link_index = fio->Fgetc();
if(disk_index == 0 || disk_index == 0x1a) {
// 欠番
fio->Fclose();
delete fio;
int disk_index = link_table[(page - 1) * 2];
int link_index = link_table[(page - 1) * 2 + 1];
if (disk_index == 0 || disk_index == 0x1a)
return {};
}
// A??.DAT以外にリンクされている場合はファイルを開き直す
if(disk_index != 1) {
tmp_name[0] = 'A' + disk_index - 1;
fio->Fclose();
if(!fio->Fopen(tmp_name, FILEIO_READ_BINARY)) {
delete fio;
return {};
}
}
auto fio = std::make_unique<FILEIO>();
fname[0] = 'A' + disk_index - 1;
if (!fio->Fopen(fname.c_str(), FILEIO_READ_BINARY))
return {};
// データ取得
fio->Fseek(link_index * 2, FILEIO_SEEK_SET);
int start_sector = fio->Fgetc();
start_sector |= fio->Fgetc() << 8;
int end_sector = fio->Fgetc();
end_sector |= fio->Fgetc() << 8;
int size = (end_sector - start_sector) * 256;
if (size == 0) {
// サイズ不正
fio->Fclose();
delete fio;
if (end_sector <= start_sector)
return {};
}
std::vector<uint8_t> buffer(size);
std::vector<uint8_t> buffer((end_sector - start_sector) * 256);
fio->Fseek((start_sector - 1) * 256, FILEIO_SEEK_SET);
fio->Fread(buffer.data(), 256, end_sector - start_sector);
fio->Fclose();
delete fio;
return buffer;
}
std::vector<uint8> dri_load_mda(uint32_t crc32_a, uint32_t crc32_b, int page)
// static
std::vector<uint8> Dri::load_mda(uint32_t crc32_a, uint32_t crc32_b, int page)
{
// データ取得
const char* name = NULL;