> On Nov 5, 2014, at 8:08 AM, jim_dai...@dell.com wrote: > > I'm building an EFI utility under Windows. I want to compress some data and > append > it to the utility. Later, when the utility is executed in the EFI shell, I > want to > have the utility decompress the data. > > I tried using BaseTools\Bin\Win32\LzmaCompress.exe to compress the data and > found > that it doesn't place the compressed and uncompressed sizes of the data at the > beginning of the compressed data. So, I tried > BaseTools\Bin\Win32\TianoCompress.exe. > > That utility does seem to create an output that the EFI_DECOMPRESS_PROTOCOL's > GetInfo() function likes. However, that protocol's Decompress() function > does not > like the compressed data's format (returns Invalid Parameter). > > I also tried using the UefiDecompressLib functions to decompress the data, but > that fails similarly. > > So, is there some Win32 utility that compresses data in the format that the > EFI_DECOMPRESS_PROTOCOL expects? If so, what/where is it? >
Interesting question. Looks like the tools have code that does the compression. https://svn.code.sf.net/p/edk2/code/trunk/edk2/BaseTools/Source/C/Common/EfiCompress.c The stand alone tools are used for GUID’ed compression schemes. These map to an EFI_SECTION_GUID_DEFINED in the FV FFS file section, while the EFI_SECTION_COMPRESSION is used for the EFI compression type. I think this is only reason stand alone tools exist is for the other forms of compression. A hack would be to use the GenSec tool. GenSec -s EFI_SECTION_COMPRESSION -o compressedFileSection RawFile I think it would generate the compressed data that starts with a EFI_COMPRESSION_SECTION structure. So if you just point pass the the EFI_COMPRESSION_SECTION the decompress should “just work”? https://svn.code.sf.net/p/edk2/code/trunk/edk2/MdePkg/Include/Pi/PiFirmwareFile.h /// /// An encapsulation section type in which the /// section data is compressed. /// typedef struct { /// /// Usual common section header. CommonHeader.Type = EFI_SECTION_COMPRESSION. /// EFI_COMMON_SECTION_HEADER CommonHeader; /// /// The UINT32 that indicates the size of the section data after decompression. /// UINT32 UncompressedLength; /// /// Indicates which compression algorithm is used. /// UINT8 CompressionType; } EFI_COMPRESSION_SECTION; If the file is to big to fit in a EFI_COMPRESSION_SECTION it will end up in a EFI_COMPRESSION_SECTION2. typedef struct { /// /// Usual common section header. CommonHeader.Type = EFI_SECTION_COMPRESSION. /// EFI_COMMON_SECTION_HEADER2 CommonHeader; /// /// UINT32 that indicates the size of the section data after decompression. /// UINT32 UncompressedLength; /// /// Indicates which compression algorithm is used. /// UINT8 CompressionType; } EFI_COMPRESSION_SECTION2; typedef struct { /// /// A 24-bit unsigned integer that contains the total size of the section in bytes, /// including the EFI_COMMON_SECTION_HEADER. /// UINT8 Size[3]; EFI_SECTION_TYPE Type; /// /// If Size is 0xFFFFFF, then ExtendedSize contains the size of the section. If /// Size is not equal to 0xFFFFFF, then this field does not exist. /// UINT32 ExtendedSize; } EFI_COMMON_SECTION_HEADER2; Thanks, Andrew Fish > Thanks, > Jim > ------------------------------------------------------------------------------ > _______________________________________________ > edk2-devel mailing list > edk2-devel@lists.sourceforge.net <mailto:edk2-devel@lists.sourceforge.net> > https://lists.sourceforge.net/lists/listinfo/edk2-devel > <https://lists.sourceforge.net/lists/listinfo/edk2-devel>
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