Some words about /Core/PSPLoaders.cpp

[RealYoti]

Code:

bool Load_PSP_ISO(const char *filename, std::string *error_string) { ISOFileSystem *umd2 = new ISOFileSystem(&pspFileSystem, constructBlockDevice(filename)); // Parse PARAM.SFO //pspFileSystem.Mount("host0:",umd2); pspFileSystem.Mount("umd0:", umd2); pspFileSystem.Mount("umd1:", umd2); pspFileSystem.Mount("disc0:", umd2); pspFileSystem.Mount("umd:", umd2); std::string sfoPath("disc0:/PSP_GAME/PARAM.SFO"); PSPFileInfo fileInfo = pspFileSystem.GetFileInfo(sfoPath.c_str()); if (fileInfo.exists) { u8 *paramsfo = new u8[(size_t)fileInfo.size]; u32 fd = pspFileSystem.OpenFile(sfoPath, FILEACCESS_READ); pspFileSystem.ReadFile(fd, paramsfo, fileInfo.size); pspFileSystem.CloseFile(fd); if (g_paramSFO.ReadSFO(paramsfo, (size_t)fileInfo.size)) { char title[1024]; sprintf(title, "%s : %s", g_paramSFO.GetValueString("DISC_ID").c_str(), g_paramSFO.GetValueString("TITLE").c_str()); INFO_LOG(LOADER, "%s", title); host->SetWindowTitle(title); } delete [] paramsfo; } std::string bootpath("disc0:/PSP_GAME/SYSDIR/EBOOT.BIN"); // bypass patchers if (pspFileSystem.GetFileInfo("disc0:/PSP_GAME/SYSDIR/EBOOT.OLD").exists) { bootpath = "disc0:/PSP_GAME/SYSDIR/EBOOT.OLD"; } bool hasEncrypted = false; u32 fd; if ((fd = pspFileSystem.OpenFile(bootpath, FILEACCESS_READ)) != 0) { u8 head[4]; pspFileSystem.ReadFile(fd, head, 4); if (memcmp(head, "~PSP", 4) == 0 || memcmp(head, "\x7F""ELF", 4) == 0) { hasEncrypted = true; } pspFileSystem.CloseFile(fd); } if (!hasEncrypted) { // try unencrypted BOOT.BIN bootpath = "disc0:/PSP_GAME/SYSDIR/BOOT.BIN"; } INFO_LOG(LOADER,"Loading %s...", bootpath.c_str()); return __KernelLoadExec(bootpath.c_str(), 0, error_string); }

Most of games has an empty BOOT.BIN file. I think that BOOT.BIN must me checked for zero header (0x00000000) before loading.
P.S. Interesting thing - size of BOOT.BIN is equal with decrypted EBOOT.BIN =)