96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <gb.h>
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#include <r_io.h>
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#include <r_util.h>
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RIOPlugin r_io_plugin_gb_ppu;
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static ut64 __lseek(RIO* io, RIODesc *desc, ut64 offset, int whence) {
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GBPPU *ppu = desc->data;
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ut64 seek = ppu->seek & 0xffff;
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switch (whence) {
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case R_IO_SEEK_SET:
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seek = R_MIN (GB_PPU_N_REGS, offset);
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break;
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case R_IO_SEEK_CUR:
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seek = R_MIN (GB_PPU_N_REGS, seek + offset);
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break;
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case R_IO_SEEK_END:
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seek = GB_PPU_N_REGS;
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break;
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}
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ppu->seek = (ppu->seek & (~0xffff)) | seek;
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return seek;
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}
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static bool __check(RIO *io, const char *pathname, bool many) {
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return r_str_startswith (pathname, "gb_ppu://");
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}
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static int __read(RIO *io, RIODesc *desc, ut8 *buf, int len) {
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GBPPU *ppu = desc->data;
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ut64 seek = ppu->seek & 0xffff;
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if (ppu->seek >= GB_PPU_N_REGS || len < 1) {
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return 0;
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}
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len = R_MIN (len, GB_PPU_N_REGS - seek);
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memcpy (buf, &ppu->buf[ppu->seek], len);
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seek += len;
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ppu->seek = (ppu->seek & (~0xffff)) | seek;
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return len;
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}
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static int __write(RIO *io, RIODesc *desc, const ut8 *buf, int len) {
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GBPPU *ppu = desc->data;
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ut64 seek = ppu->seek & 0xffff;
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if (ppu->seek >= GB_PPU_N_REGS || len < 1) {
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return 0;
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}
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len = R_MIN (len, GB_PPU_N_REGS - seek);
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ut32 i;
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for (i = 0; i < len; i++) {
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switch (seek) {
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case GB_PPU_STAT:
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ppu->buf[GB_PPU_STAT] = (buf[i] & 0xf8) | (ppu->buf[GB_PPU_STAT] & 0x7);
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case GB_PPU_LY:
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break;
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default:
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ppu->buf[seek] = buf[i];
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break;
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}
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seek++;
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}
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return len;
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}
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static bool __close(RIODesc *desc) {
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return true;
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}
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static RIODesc *__open(RIO *io, const char *pathname, int rw, int mode) {
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if (!r_str_startswith (pathname, "gb_ppu://")) {
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return NULL;
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}
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GBPPU *ppu = NULL;
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sscanf (pathname, "gb_ppu://%p", &ppu);
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RIODesc *desc = r_io_desc_new (io, &r_io_plugin_gb_ppu, pathname,
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R_PERM_RWX, mode, ppu);
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return desc;
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}
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RIOPlugin r_io_plugin_gb_ppu = {
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.meta = {
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.name = "gb_ppu",
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.desc = "gb_ppu",
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.license = "LGPL",
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},
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.uris = "gb_ppu://",
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.open = __open,
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.close = __close,
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.read = __read,
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.check = __check,
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.seek = __lseek,
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.write = __write,
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};
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