Introduce the class BitmapFlags that parses a bitmap flags mask.

Suggested-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
---
 tests/qemu-iotests/qcow2_format.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tests/qemu-iotests/qcow2_format.py b/tests/qemu-iotests/qcow2_format.py
index 1435e34..d8c058d 100644
--- a/tests/qemu-iotests/qcow2_format.py
+++ b/tests/qemu-iotests/qcow2_format.py
@@ -40,6 +40,22 @@ class Flags64(Qcow2Field):
         return str(bits)
 
 
+class BitmapFlags(Qcow2Field):
+
+    flags = {
+        0x1: 'in-use',
+        0x2: 'auto'
+    }
+
+    def __str__(self):
+        bits = []
+        for bit in range(64):
+            flag = self.value & (1 << bit)
+            if flag:
+                bits.append(self.flags.get(flag, '{:#x}'.format(flag)))
+        return f'{self.value:#x} ({bits})'
+
+
 class Enum(Qcow2Field):
 
     def __str__(self):
-- 
1.8.3.1

03.07.2020 16:13, Andrey Shinkevich wrote:
> Introduce the class BitmapFlags that parses a bitmap flags mask.
> 
> Suggested-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
> ---
>   tests/qemu-iotests/qcow2_format.py | 16 ++++++++++++++++
>   1 file changed, 16 insertions(+)
> 
> diff --git a/tests/qemu-iotests/qcow2_format.py b/tests/qemu-iotests/qcow2_format.py
> index 1435e34..d8c058d 100644
> --- a/tests/qemu-iotests/qcow2_format.py
> +++ b/tests/qemu-iotests/qcow2_format.py
> @@ -40,6 +40,22 @@ class Flags64(Qcow2Field):
>           return str(bits)
>   
>   
> +class BitmapFlags(Qcow2Field):
> +
> +    flags = {
> +        0x1: 'in-use',
> +        0x2: 'auto'
> +    }
> +
> +    def __str__(self):
> +        bits = []
> +        for bit in range(64):
> +            flag = self.value & (1 << bit)
> +            if flag:
> +                bits.append(self.flags.get(flag, '{:#x}'.format(flag)))

please use f-strings where possible, for consistency.

Also, more obvious notation for unknown bits would be f'bit-{bit}' I think, so you see number of bit, not big hex number.

> +        return f'{self.value:#x} ({bits})'
> +
> +
>   class Enum(Qcow2Field):
>   
>       def __str__(self):
> 


-- 
Best regards,
Vladimir