Extract psp2swu.self from PUP

extract_psp2swu.c

#include <kernel/iofilemgr.h>
#include <stdint.h>

int extract(const char *pup, const char *psp2swu) {
	int inf, outf;

	if ((inf = sceIoOpen(pup, SCE_O_RDONLY, 0)) < 0) {
		return -1;
	}

	if ((outf = sceIoOpen(psp2swu, SCE_O_CREAT | SCE_O_WRONLY | SCE_O_TRUNC, 6)) < 0) {
		return -1;
	}

	int ret = -1;
	int count;

	if (sceIoLseek(inf, 0x18, SCE_SEEK_SET) < 0) {
		goto end;
	}

	if (sceIoRead(inf, &count, 4) < 4) {
		goto end;
	}

	if (sceIoLseek(inf, 0x80, SCE_SEEK_SET) < 0) {
		goto end;
	}

	struct {
		uint64_t id;
		uint64_t off;
		uint64_t len;
		uint64_t field_18;
	} __attribute__((packed)) file_entry;

	for (int i = 0; i < count; i++) {

		if (sceIoRead(inf, &file_entry, sizeof(file_entry)) < sizeof(file_entry)) {
			goto end;
		}

		if (file_entry.id == 0x200) {
			break;
		}
	}

	if (file_entry.id == 0x200) {
		char buffer[1024];
		int rd;

		if (sceIoLseek(inf, file_entry.off, SCE_SEEK_SET) < 0) {
			goto end;
		}

		while (file_entry.len && (rd = sceIoRead(inf, buffer, sizeof(buffer))) > 0) {
			if (rd > file_entry.len) {
				rd = file_entry.len;
			}
			sceIoWrite(outf, buffer, rd);
			file_entry.len -= rd;
		}

		if (file_entry.len == 0) {
			ret = 0;
		}
	}

end:
	sceIoClose(inf);
	sceIoClose(outf);
	return ret;
}

int main(int argc, const char *argv[]){
	extract(argv[1], argv[2]);

	return 0;
}