Failed to parse 3.rvm: After chunk HEAD, expected offset 0xcc, current offset is 0xac

[shahho]

I seem to be having a big problem parsing the rvm header. It‘s error content is: Failed to parse ./../rvm/3.rvm: After chunk HEAD, expected offset 0xcc, current offset is 0xac hexdump file is:

Correct example file hexdump is:

some code like this,I just add some print test code:

The result of parse 3.rvm is as follows:

The correct result of parse 6.rvm is as follows:

How can I fix this problem to fit ’3.rvm‘. I have a lot of rvm files here that have the same problem with ’3.rvm‘.

[VegarRingdalAibel]

Dunno if this is any help But I made a tool to myself to split rvm files before using them with RVM parser. One per SITE. Due to memory issues in azure when converting files.

https://github.com/vegarringdal/rvmsplitter

It just copies the header to each file, but you can look on the part that adds next chuck in BIG endian and make it fix actual header too.

[cdyk]

From a quick look, it looks like the first file has encoding (stored after the user name), but the second file has not.

However, both files have head chunk version 1 (offset 0x28). Until now I only have seen encoding present in version 2 of the head chunk, and I test for that (see line 126 in ParserRVM.cpp).

If you can compile it yourself, you can try:

curr_ptr = base_ptr + expected_next_chunk_offset;
if (!verifyOffset(ctx, "HEAD", base_ptr, curr_ptr, expected_next_chunk_offset)) return nullptr;

at line 133 to skip this test and just use the expected end.

Is this just a single file or does it happen often?

[shahho]

There are many such files, and the rvm file provided by the design institute is based on the export of the same software. Here are some files we can see: https://qwq2x.com/share/1.rvm https://qwq2x.com/share/2.rvm https://qwq2x.com/share/3.rvm