commit 3b38ce9b98e01d10975e97938aa3b6f2ca65467e
author Karl Meakin <karl.meakin@arm.com> Mon Jan 06 11:52:04 2025 +0000
committer Joao Alves <joao.alves@arm.com> Thu Jan 30 16:46:55 2025 +0100
tree 4f1ca181b7e81555beab7972996cd43d060fa167
parent e0b0e325307072e6d3fb44631f3ec8daca47dc64

fix(hftest): recover from UTF-8 errors in logs

Strings logged by `dlog` may contain arbitrary bytes, which may not be
valid UTF-8. This can cause `hftest` to crash when reading the log
files.

Change `read_file` to open files with the `backslashreplace` error
handler, so that bytes that are invalid UTF-8 will be replaced with
backslash escape sequences.

Example:
```c
HFTEST_LOG("Hello, world \x80");
```

Before:
```
  File "/Users/karmea01/git/work/spm/./test/hftest/hftest.py", line 73, in read_file
    return f.read()
           ^^^^^^^^
  File "<frozen codecs>", line 322, in decode
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 2350: invalid start byte
```

After:
```
[1 0] [hftest] hello world \x80
```

Change-Id: I8d729846d27c94d5f227bbcebb764a2d0a8659de
Signed-off-by: Karl Meakin <karl.meakin@arm.com>