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Simplify ISO size calculation

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This is simplified by no longer retaining the read position,
which is unecessary because all read operations are offset
from an initial absolute position (so this was unecessary code).
This commit is contained in:
krcroft 2020-02-05 23:10:40 -08:00
parent 4aa3311021
commit 55f6e4307f
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GPG key ID: 4AD3678F4A2C291C
1 changed files with 9 additions and 3 deletions
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12
src/dos/cdrom_image.cpp
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@ -83,13 +83,19 @@ bool CDROM_Interface_Image::BinaryFile::read(Bit8u *buffer, int seek, int count)
int CDROM_Interface_Image::BinaryFile::getLength()
{
// Guard: only proceed with a valid file
if (file == nullptr) return -1;
if (file == nullptr)
return -1;
std::streampos original_pos = file->tellg();
// All read operations involve an absolute position and
// this function isn't called in other threads, therefore
// we don't need to retain the original read position.
file->seekg(0, ios::end);
const int length = static_cast<int>(file->tellg());
file->seekg(original_pos, ios::end);
#ifdef DEBUG
LOG_MSG("CDROM: BinaryLength (in milliseconds) = %d", length);
#endif
return length;
}
Bit16u CDROM_Interface_Image::BinaryFile::getEndian()