StreamWriter crashes when writing more than a couple of bytes about ruby-xz

[u3shit]

Okay, this is the problem:

--- lib/xz/stream.rb~   2021-11-06 14:47:49.272470250 +0100
+++ lib/xz/stream.rb    2021-11-06 16:12:47.648799304 +0100
@@ -118,7 +118,7 @@
       pos = 0
       until pos > str.bytesize # Do not use >=, that conflicts with #lzma_finish
         substr = str[pos, XZ::CHUNK_SIZE]
-        @input_buffer_p[0, str.bytesize] = substr
+        @input_buffer_p[0, substr.bytesize] = substr
         pos += XZ::CHUNK_SIZE
 
         @lzma_stream.next_in  = @input_buffer_p

Even though substr is only XZ::CHUNK_SIZE long, that assignment still copies str.bytesize number of bytes from substr:

#0  __memmove_avx_unaligned_erms () at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:269                                                                                                                                                                                                                            
#1  0x00007f046994ef46 in memcpy (__len=120000, __src=<optimized out>, __dest=<optimized out>) at /usr/include/bits/string_fortified.h:29                                                                                                                                                                                      
#2  ruby_nonempty_memcpy (n=120000, src=<optimized out>, dest=<optimized out>) at ../.././include/ruby/internal/memory.h:269                                                                                                                                                                                                   
#3  rb_fiddle_ptr_aset (argc=3, argv=<optimized out>, self=<optimized out>) at pointer.c:719      

[Quintus]

Thanks for the report, but: I am abandoning this project now. I don’t use it myself anymore and simply don’t have time to further maintain it.