Merged revision(s) 20333 from trunk/OpenMPT:

[Fix] mpt/io_read/filedata_base_unseekable.hpp: Avoid integer overflow in EnsureCacheBuffer() when reading unseekable files are close to uint32_max in size.
........


git-svn-id: https://source.openmpt.org/svn/openmpt/branches/OpenMPT-1.31@20339 56274372-70c3-4bfc-bfc3-4c3a0b034d27

src/mpt/io_read/filedata_base_unseekable.hpp

@@ -50,7 +50,7 @@ class FileDataUnseekable : public IFileData {
  };
 
  void EnsureCacheBuffer(std::size_t requiredbuffersize) const {
- if (cache.size() >= cachesize + requiredbuffersize) {
+ if (cache.size() - cachesize >= requiredbuffersize) {
  return;
  }
  if (cache.size() == 0) {