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I have situation where I have (simplified) Where the sum bytes consumed for I would assume I can do this with something from the helpers, but I can not really figure out how. I would like something to the python equivalent |
Answered by
csnover
Apr 5, 2023
Replies: 1 comment 2 replies
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You should be able to use the TakeSeek stream wrapper to limit the size of the stream plus the until_eof helper to read through the end of that data: use binrw::io::TakeSeekExt;
#[derive(BinRead, BinWrite, Debug, Clone)]
pub struct EDK2VariableStore {
pub size_in_bytes: u32,
#[br(align_after = 4, map_stream = |s| s.take_seek(size_in_bytes.into()), parse_with = binrw::helpers::until_eof)]
pub variables: Vec<VariableEntry>,
pub something_else :u32,
....
} |
2 replies
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I have a similar use case, but when I do this, it goes into an infinite loop, argument to #[derive(Debug, BinRead, Clone)]
struct FuncBody {
size: u8,
nlocal: u8,
#[br(count = nlocal)]
locals: Vec<LocalEntry>,
#[br(map_stream = |s| s.take_seek(3u32.into()), parse_with = until_eof)]
code: Vec<Instuction>,
}
#[derive(Debug, BinRead, PartialEq, Copy, Clone)]
pub enum Instuction {
#[br(magic = 0x00u8)]
Unreachable,
....
} |
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I had this as the instruction enum. #[derive(Debug, BinRead, PartialEq, Copy, Clone)]
pub enum Instuction {
#[br(magic = 0x00u8)]
Unreachable,
....
//no magic value for this variant
None,
}After removing the None variant, the parser finishes. |
Answer selected by
Mimoja
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You should be able to use the TakeSeek stream wrapper to limit the size of the stream plus the until_eof helper to read through the end of that data: