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Adds workaround for Sweet 16, which can produce bad data.

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This commit is contained in:
Thomas Harte 2021-02-16 22:21:10 -05:00
parent 35be402354
commit bd54e30748
1 changed files with 8 additions and 3 deletions
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11
Storage/Disk/DiskImage/Formats/2MG.cpp
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@ -18,8 +18,8 @@ DiskImageHolderBase *Disk2MG::open(const std::string &file_name) {
// Check the signature. // Check the signature.
if(!file.check_signature("2IMG")) throw Error::InvalidFormat; if(!file.check_signature("2IMG")) throw Error::InvalidFormat;
// Skip the creator. // Grab the creator, potential to fix the data size momentarily.
file.seek(4, SEEK_CUR); const auto creator = file.read(4);
// Grab the header size, version number and image format. // Grab the header size, version number and image format.
const uint16_t header_size = file.get16le(); const uint16_t header_size = file.get16le();
@ -32,7 +32,12 @@ DiskImageHolderBase *Disk2MG::open(const std::string &file_name) {
// Get the offset and size of the disk image data. // Get the offset and size of the disk image data.
const uint32_t data_start = file.get32le(); const uint32_t data_start = file.get32le();
const uint32_t data_size = file.get32le(); uint32_t data_size = file.get32le();
// Correct for the Sweet 16 emulator, which writes broken 2MGs.
if(!data_size && !memcmp(creator.data(), "WOOF", 4)) {
data_size = uint32_t(file.stats().st_size - header_size);
}
// Skipped: // Skipped:
// //