BaseTools/GenSec: Use SECTION_SIZE to read section size

Replace the open-coded read of the 3-byte section Size[] field with
the SECTION_SIZE() macro from Pi/PiFirmwareFile.h. The macro reads
exactly the three Size[] bytes (endianness-safe) instead of a 4-byte
load that over-reads the adjacent byte. No functional change.

Verified by building BaseTools and running GenSec:

  python3 BaseTools/Edk2ToolsBuild.py -t GCC
  GenSec -s EFI_SECTION_RAW -o out.sec in.bin   # in.bin: 100 bytes

out.sec is 104 bytes: the 100-byte payload plus the 4-byte
EFI_COMMON_SECTION_HEADER. The Size field of the header reads
0x000068, matching out.sec's size that is calculated by SECTION_SIZE.

Generated with the following Coccinelle semantic patch:

```smpl
@@
EFI_COMMON_SECTION_HEADER *E;
typedef UINT32;
@@
(
- *(UINT32 *)(E->Size) & 0x00FFFFFF
+ SECTION_SIZE (E)
|
- *(UINT32 *)E->Size & 0x00FFFFFF
+ SECTION_SIZE (E)
)
```

Signed-off-by: Mingjie Shen <shen497@purdue.edu>

0 files changed, 0 insertions, 0 deletions