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Message #127609
[Bug 1472523] Re: logical AND with Constant is not logically correct
** Description changed:
- libmng version: 2.0.2
+ libmng version: 2.0.3
In file libmng_pixels.c, there are many functions; those are performing
bit format conversion (8bit format to 16 bit, 16bit to 8bit etc.). For
format conversion function are doing logical ANDing with Constant that
is not logically correct.
e.g. At #15692: *(pDstline+1) = (mng_uint8)(iR && 0xFF);
In above example due to Logical ANDing(&&) in place of bitwise ANDing(&)
there is a loss of information stored in LSB’s of iR.
-
Now, Replaced logical ANDing operator (&&) with bitwise ANDing
operator(&)
After correction:
At #15692: *(pDstline+1) = (mng_uint8)(iR & 0xFF);
Many similar changes are applied in libmng_pixel.c, For detail
information please check the attached patch file.
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https://bugs.launchpad.net/bugs/1472523
Title:
logical AND with Constant is not logically correct
Status in libmng package in Ubuntu:
New
Bug description:
libmng version: 2.0.3
In file libmng_pixels.c, there are many functions; those are
performing bit format conversion (8bit format to 16 bit, 16bit to 8bit
etc.). For format conversion function are doing logical ANDing with
Constant that is not logically correct.
e.g. At #15692: *(pDstline+1) = (mng_uint8)(iR && 0xFF);
In above example due to Logical ANDing(&&) in place of bitwise
ANDing(&) there is a loss of information stored in LSB’s of iR.
Now, Replaced logical ANDing operator (&&) with bitwise ANDing
operator(&)
After correction:
At #15692: *(pDstline+1) = (mng_uint8)(iR & 0xFF);
Many similar changes are applied in libmng_pixel.c, For detail
information please check the attached patch file.
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References