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Detect ISO files from file contents if extensions are wrong.

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On older Android versions (that still support Android Storage
Framework), filenames are not always preserved in Content URIs, they can
look like .../msf:342 and things like that. So identify a few more file
types by content if filename identification fails.
This commit is contained in:
Henrik Rydgård 2022-04-30 17:47:17 +02:00
parent 81852b5f8b
commit d4dedeeeb8
3 changed files with 26 additions and 0 deletions
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24
Core/Loaders.cpp
View File

@ -126,6 +126,9 @@ IdentifiedFileType Identify_File(FileLoader *fileLoader, std::string *errorStrin
return IdentifiedFileType::NORMAL_DIRECTORY;
}
// OK, quick methods of identification for common types failed. Moving on to more expensive methods,
// starting by reading the first few bytes.
u32_le id;
size_t readSize = fileLoader->ReadAt(0, 4, 1, &id);
@ -141,8 +144,28 @@ IdentifiedFileType Identify_File(FileLoader *fileLoader, std::string *errorStrin
} else if (!memcmp(&_id, "\x00PBP", 4)) {
fileLoader->ReadAt(0x24, 4, 1, &psar_offset);
fileLoader->ReadAt(psar_offset, 4, 1, &psar_id);
// Fall through to the below if chain.
} else if (!memcmp(&_id, "Rar!", 4)) {
return IdentifiedFileType::ARCHIVE_RAR;
} else if (!memcmp(&_id, "\x37\x7A\xBC\xAF", 4)) {
return IdentifiedFileType::ARCHIVE_7Z;
} else if (!memcmp(&_id, "\0\0\0\0", 4)) {
// All zeroes. ISO files start like this but their 16th 2048-byte sector contains metadata.
if (fileLoader->FileSize() > 0x8100) {
char buffer[16];
fileLoader->ReadAt(0x8000, sizeof(buffer), buffer);
if (!memcmp(buffer + 1, "CD001", 5)) {
// It's an ISO file.
if (!memcmp(buffer + 8, "PSP GAME", 8)) {
return IdentifiedFileType::PSP_ISO;
}
return IdentifiedFileType::UNKNOWN_ISO;
}
}
} else if (!memcmp(&_id, "CISO", 4)) {
// CISO are not used for many other kinds of ISO so let's just guess it's a PSP one and let it
// fail later...
return IdentifiedFileType::PSP_ISO;
}
if (id == 'FLE\x7F') {
@ -337,6 +360,7 @@ bool LoadFile(FileLoader **fileLoaderPtr, std::string *error_string) {
case IdentifiedFileType::UNKNOWN_BIN:
case IdentifiedFileType::UNKNOWN_ELF:
case IdentifiedFileType::UNKNOWN_ISO:
case IdentifiedFileType::UNKNOWN:
ERROR_LOG(LOADER, "Unknown file type: %s (%s)", fileLoader->GetPath().c_str(), error_string->c_str());
*error_string = "Unknown file type: " + fileLoader->GetPath().ToString();

1
Core/Loaders.h
View File

@ -37,6 +37,7 @@ enum class IdentifiedFileType {
UNKNOWN_BIN,
UNKNOWN_ELF,
UNKNOWN_ISO,
// Try to reduce support emails...
ARCHIVE_RAR,

1
UI/GameInfoCache.cpp
View File

@ -83,6 +83,7 @@ bool GameInfo::Delete() {
case IdentifiedFileType::PSP_ELF:
case IdentifiedFileType::UNKNOWN_BIN:
case IdentifiedFileType::UNKNOWN_ELF:
case IdentifiedFileType::UNKNOWN_ISO:
case IdentifiedFileType::ARCHIVE_RAR:
case IdentifiedFileType::ARCHIVE_ZIP:
case IdentifiedFileType::ARCHIVE_7Z: