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Merge pull request #10841 from liamwhite/math-is-hard

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vfs_concat: fix offset calculation when not aligned to file boundary
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bunnei 2023-06-21 21:07:08 -07:00 committed by GitHub
parent 8ad64bc253 e5f1b22e16
commit 8cb6b33809
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1 changed files with 10 additions and 4 deletions
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14
src/core/file_sys/vfs_concat.cpp
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@ -150,23 +150,29 @@ std::size_t ConcatenatedVfsFile::Read(u8* data, std::size_t length, std::size_t
while (cur_length > 0 && it != concatenation_map.end()) {
// Check if we can read the file at this position.
const auto& file = it->file;
const u64 file_offset = it->offset;
const u64 map_offset = it->offset;
const u64 file_size = file->GetSize();
if (cur_offset >= file_offset + file_size) {
if (cur_offset > map_offset + file_size) {
// Entirely out of bounds read.
break;
}
// Read the file at this position.
const u64 intended_read_size = std::min<u64>(cur_length, file_size);
const u64 file_seek = cur_offset - map_offset;
const u64 intended_read_size = std::min<u64>(cur_length, file_size - file_seek);
const u64 actual_read_size =
file->Read(data + (cur_offset - offset), intended_read_size, cur_offset - file_offset);
file->Read(data + (cur_offset - offset), intended_read_size, file_seek);
// Update tracking.
cur_offset += actual_read_size;
cur_length -= actual_read_size;
it++;
// If we encountered a short read, we're done.
if (actual_read_size < intended_read_size) {
break;
}
}
return cur_offset - offset;