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< div id = "projectname" > libaaruformat< span id = "projectnumber" >   1.0< / span >
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< div id = "projectbrief" > Aaru Data Preservation Suite - Format Library< / div >
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< div class = "headertitle" > < div class = "title" > BlockHeader Struct Reference< / div > < / div >
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< p > Header preceding the compressed data payload of a data block (BlockType::DataBlock).
< a href = "#details" > More...< / a > < / p >
< p > < code > #include < < a class = "el" href = "data_8h_source.html" > aaruformat/structs/data.h< / a > > < / code > < / p >
< table class = "memberdecls" >
< tr class = "heading" > < td colspan = "2" > < h2 id = "header-pub-attribs" class = "groupheader" > < a id = "pub-attribs" name = "pub-attribs" > < / a >
Data Fields< / h2 > < / td > < / tr >
< tr class = "memitem:a3b03f118fb2dc3dcef3f87a82238e358" id = "r_a3b03f118fb2dc3dcef3f87a82238e358" > < td class = "memItemLeft" align = "right" valign = "top" > uint32_t  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "#a3b03f118fb2dc3dcef3f87a82238e358" > identifier< / a > < / td > < / tr >
< tr class = "memdesc:a3b03f118fb2dc3dcef3f87a82238e358" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Block identifier, must be BlockType::DataBlock. < br / > < / td > < / tr >
< tr class = "memitem:ac31ad48f3362a43175c94ec2e30662ad" id = "r_ac31ad48f3362a43175c94ec2e30662ad" > < td class = "memItemLeft" align = "right" valign = "top" > uint16_t  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "#ac31ad48f3362a43175c94ec2e30662ad" > type< / a > < / td > < / tr >
< tr class = "memdesc:ac31ad48f3362a43175c94ec2e30662ad" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Logical data classification (value from < a class = "el" href = "enums_8h.html#ad8ed01ff3ff33333d8e19db4d2818bb6" > DataType< / a > ). < br / > < / td > < / tr >
< tr class = "memitem:ad68963422fd2a5f6d0e0be751cbef559" id = "r_ad68963422fd2a5f6d0e0be751cbef559" > < td class = "memItemLeft" align = "right" valign = "top" > uint16_t  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "#ad68963422fd2a5f6d0e0be751cbef559" > compression< / a > < / td > < / tr >
< tr class = "memdesc:ad68963422fd2a5f6d0e0be751cbef559" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Compression algorithm used (value from < a class = "el" href = "enums_8h.html#affec749ed88365143745313ae9168263" > CompressionType< / a > ). < br / > < / td > < / tr >
< tr class = "memitem:a5bd50f95c8c1f91e5013a1a154690beb" id = "r_a5bd50f95c8c1f91e5013a1a154690beb" > < td class = "memItemLeft" align = "right" valign = "top" > uint32_t  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "#a5bd50f95c8c1f91e5013a1a154690beb" > sectorSize< / a > < / td > < / tr >
< tr class = "memdesc:a5bd50f95c8c1f91e5013a1a154690beb" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Size in bytes of each logical sector represented in this block. < br / > < / td > < / tr >
< tr class = "memitem:a0ee87beb4362823260f70a87ac17379f" id = "r_a0ee87beb4362823260f70a87ac17379f" > < td class = "memItemLeft" align = "right" valign = "top" > uint32_t  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "#a0ee87beb4362823260f70a87ac17379f" > cmpLength< / a > < / td > < / tr >
< tr class = "memdesc:a0ee87beb4362823260f70a87ac17379f" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Size in bytes of the compressed payload immediately following this header. < br / > < / td > < / tr >
< tr class = "memitem:a1f9f3204a10090709b28d0df4bb547e5" id = "r_a1f9f3204a10090709b28d0df4bb547e5" > < td class = "memItemLeft" align = "right" valign = "top" > uint32_t  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "#a1f9f3204a10090709b28d0df4bb547e5" > length< / a > < / td > < / tr >
< tr class = "memdesc:a1f9f3204a10090709b28d0df4bb547e5" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Size in bytes of the uncompressed payload resulting after decompression. < br / > < / td > < / tr >
< tr class = "memitem:a8ff40eae6c49f0d9b49825f75e1e2bf8" id = "r_a8ff40eae6c49f0d9b49825f75e1e2bf8" > < td class = "memItemLeft" align = "right" valign = "top" > uint64_t  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "#a8ff40eae6c49f0d9b49825f75e1e2bf8" > cmpCrc64< / a > < / td > < / tr >
< tr class = "memdesc:a8ff40eae6c49f0d9b49825f75e1e2bf8" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > CRC64-ECMA of the compressed payload (cmpLength bytes). < br / > < / td > < / tr >
< tr class = "memitem:ab4d9e3a871e0c7f12a881017dac4ca12" id = "r_ab4d9e3a871e0c7f12a881017dac4ca12" > < td class = "memItemLeft" align = "right" valign = "top" > uint64_t  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "#ab4d9e3a871e0c7f12a881017dac4ca12" > crc64< / a > < / td > < / tr >
< tr class = "memdesc:ab4d9e3a871e0c7f12a881017dac4ca12" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > CRC64-ECMA of the uncompressed payload (length bytes). < br / > < / td > < / tr >
< / table >
< a name = "details" id = "details" > < / a > < h2 id = "header-details" class = "groupheader" > Detailed Description< / h2 >
< div class = "textblock" > < p > Header preceding the compressed data payload of a data block (BlockType::DataBlock). < / p >
< p > Invariants:< / p > < ul >
< li > cmpLength > 0 unless length == 0 (empty block)< / li >
< li > length == 0 implies cmpLength == 0< / li >
< li > If compression == CompressionType::None then cmpLength == length< / li >
< li > length % sectorSize == 0< / li >
< / ul >
< p > Validation strategy (recommended for readers):< / p > < ol type = "1" >
< li > Verify identifier == BlockType::DataBlock.< / li >
< li > Verify sectorSize is non-zero and a power-of-two or a commonly used size (512/1024/2048/4096/2352).< / li >
< li > Verify invariants above and CRCs after (de)compression. < / li >
< / ol >
< p class = "definition" > Definition at line < a class = "el" href = "data_8h_source.html#l00070" > 70< / a > of file < a class = "el" href = "data_8h_source.html" > data.h< / a > .< / p >
< / div > < a name = "doc-variable-members" id = "doc-variable-members" > < / a > < h2 id = "header-doc-variable-members" class = "groupheader" > Field Documentation< / h2 >
< a id = "a8ff40eae6c49f0d9b49825f75e1e2bf8" name = "a8ff40eae6c49f0d9b49825f75e1e2bf8" > < / a >
< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a8ff40eae6c49f0d9b49825f75e1e2bf8" > ◆   < / a > < / span > cmpCrc64< / h2 >
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< div class = "memproto" >
< table class = "memname" >
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< td class = "memname" > uint64_t BlockHeader::cmpCrc64< / td >
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< / div > < div class = "memdoc" >
< p > CRC64-ECMA of the compressed payload (cmpLength bytes). < / p >
< p class = "definition" > Definition at line < a class = "el" href = "data_8h_source.html#l00078" > 78< / a > of file < a class = "el" href = "data_8h_source.html" > data.h< / a > .< / p >
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< p class = "reference" > Referenced by < a class = "el" href = "write_8c_source.html#l01403" > aaruf_close_current_block()< / a > , < a class = "el" href = "verify_8c_source.html#l00130" > aaruf_verify_image()< / a > , < a class = "el" href = "close_8c_source.html#l01810" > write_dvd_long_sector_blocks()< / a > , < a class = "el" href = "close_8c_source.html#l02247" > write_dvd_title_key_decrypted_block()< / a > , < a class = "el" href = "close_8c_source.html#l02411" > write_media_tags()< / a > , < a class = "el" href = "close_8c_source.html#l00850" > write_mode2_subheaders_block()< / a > , < a class = "el" href = "close_8c_source.html#l00966" > write_sector_prefix()< / a > , < a class = "el" href = "close_8c_source.html#l01508" > write_sector_subchannel()< / a > , and < a class = "el" href = "close_8c_source.html#l01088" > write_sector_suffix()< / a > .< / p >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a0ee87beb4362823260f70a87ac17379f" > ◆   < / a > < / span > cmpLength< / h2 >
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< td class = "memname" > uint32_t BlockHeader::cmpLength< / td >
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< p > Size in bytes of the compressed payload immediately following this header. < / p >
< p class = "definition" > Definition at line < a class = "el" href = "data_8h_source.html#l00076" > 76< / a > of file < a class = "el" href = "data_8h_source.html" > data.h< / a > .< / p >
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< p class = "reference" > Referenced by < a class = "el" href = "write_8c_source.html#l01403" > aaruf_close_current_block()< / a > , < a class = "el" href = "read_8c_source.html#l00253" > aaruf_read_sector()< / a > , < a class = "el" href = "verify_8c_source.html#l00130" > aaruf_verify_image()< / a > , < a class = "el" href = "data_8c_source.html#l00071" > process_data_block()< / a > , < a class = "el" href = "close_8c_source.html#l01810" > write_dvd_long_sector_blocks()< / a > , < a class = "el" href = "close_8c_source.html#l02247" > write_dvd_title_key_decrypted_block()< / a > , < a class = "el" href = "close_8c_source.html#l02411" > write_media_tags()< / a > , < a class = "el" href = "close_8c_source.html#l00850" > write_mode2_subheaders_block()< / a > , < a class = "el" href = "close_8c_source.html#l00966" > write_sector_prefix()< / a > , < a class = "el" href = "close_8c_source.html#l01508" > write_sector_subchannel()< / a > , and < a class = "el" href = "close_8c_source.html#l01088" > write_sector_suffix()< / a > .< / p >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#ad68963422fd2a5f6d0e0be751cbef559" > ◆   < / a > < / span > compression< / h2 >
< div class = "memitem" >
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< td class = "memname" > uint16_t BlockHeader::compression< / td >
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< / div > < div class = "memdoc" >
< p > Compression algorithm used (value from < a class = "el" href = "enums_8h.html#affec749ed88365143745313ae9168263" > CompressionType< / a > ). < / p >
< p class = "definition" > Definition at line < a class = "el" href = "data_8h_source.html#l00074" > 74< / a > of file < a class = "el" href = "data_8h_source.html" > data.h< / a > .< / p >
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< p class = "reference" > Referenced by < a class = "el" href = "write_8c_source.html#l01403" > aaruf_close_current_block()< / a > , < a class = "el" href = "read_8c_source.html#l00253" > aaruf_read_sector()< / a > , < a class = "el" href = "write_8c_source.html#l00098" > aaruf_write_sector()< / a > , < a class = "el" href = "data_8c_source.html#l00071" > process_data_block()< / a > , < a class = "el" href = "close_8c_source.html#l01810" > write_dvd_long_sector_blocks()< / a > , < a class = "el" href = "close_8c_source.html#l02247" > write_dvd_title_key_decrypted_block()< / a > , < a class = "el" href = "close_8c_source.html#l02411" > write_media_tags()< / a > , < a class = "el" href = "close_8c_source.html#l00850" > write_mode2_subheaders_block()< / a > , < a class = "el" href = "close_8c_source.html#l00966" > write_sector_prefix()< / a > , < a class = "el" href = "close_8c_source.html#l01508" > write_sector_subchannel()< / a > , and < a class = "el" href = "close_8c_source.html#l01088" > write_sector_suffix()< / a > .< / p >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#ab4d9e3a871e0c7f12a881017dac4ca12" > ◆   < / a > < / span > crc64< / h2 >
< div class = "memitem" >
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< td class = "memname" > uint64_t BlockHeader::crc64< / td >
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< p > CRC64-ECMA of the uncompressed payload (length bytes). < / p >
< p class = "definition" > Definition at line < a class = "el" href = "data_8h_source.html#l00079" > 79< / a > of file < a class = "el" href = "data_8h_source.html" > data.h< / a > .< / p >
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< p class = "reference" > Referenced by < a class = "el" href = "write_8c_source.html#l01403" > aaruf_close_current_block()< / a > , < a class = "el" href = "data_8c_source.html#l00071" > process_data_block()< / a > , < a class = "el" href = "close_8c_source.html#l01810" > write_dvd_long_sector_blocks()< / a > , < a class = "el" href = "close_8c_source.html#l02247" > write_dvd_title_key_decrypted_block()< / a > , < a class = "el" href = "close_8c_source.html#l02411" > write_media_tags()< / a > , < a class = "el" href = "close_8c_source.html#l00850" > write_mode2_subheaders_block()< / a > , < a class = "el" href = "close_8c_source.html#l00966" > write_sector_prefix()< / a > , < a class = "el" href = "close_8c_source.html#l01508" > write_sector_subchannel()< / a > , and < a class = "el" href = "close_8c_source.html#l01088" > write_sector_suffix()< / a > .< / p >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a3b03f118fb2dc3dcef3f87a82238e358" > ◆   < / a > < / span > identifier< / h2 >
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< td class = "memname" > uint32_t BlockHeader::identifier< / td >
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< p > Block identifier, must be BlockType::DataBlock. < / p >
< p class = "definition" > Definition at line < a class = "el" href = "data_8h_source.html#l00072" > 72< / a > of file < a class = "el" href = "data_8h_source.html" > data.h< / a > .< / p >
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< p class = "reference" > Referenced by < a class = "el" href = "write_8c_source.html#l00098" > aaruf_write_sector()< / a > , < a class = "el" href = "data_8c_source.html#l00071" > process_data_block()< / a > , < a class = "el" href = "close_8c_source.html#l01810" > write_dvd_long_sector_blocks()< / a > , < a class = "el" href = "close_8c_source.html#l02247" > write_dvd_title_key_decrypted_block()< / a > , < a class = "el" href = "close_8c_source.html#l02411" > write_media_tags()< / a > , < a class = "el" href = "close_8c_source.html#l00850" > write_mode2_subheaders_block()< / a > , < a class = "el" href = "close_8c_source.html#l00966" > write_sector_prefix()< / a > , < a class = "el" href = "close_8c_source.html#l01508" > write_sector_subchannel()< / a > , and < a class = "el" href = "close_8c_source.html#l01088" > write_sector_suffix()< / a > .< / p >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a1f9f3204a10090709b28d0df4bb547e5" > ◆   < / a > < / span > length< / h2 >
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< td class = "memname" > uint32_t BlockHeader::length< / td >
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< p > Size in bytes of the uncompressed payload resulting after decompression. < / p >
< p class = "definition" > Definition at line < a class = "el" href = "data_8h_source.html#l00077" > 77< / a > of file < a class = "el" href = "data_8h_source.html" > data.h< / a > .< / p >
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< p class = "reference" > Referenced by < a class = "el" href = "write_8c_source.html#l01403" > aaruf_close_current_block()< / a > , < a class = "el" href = "read_8c_source.html#l00253" > aaruf_read_sector()< / a > , < a class = "el" href = "data_8c_source.html#l00071" > process_data_block()< / a > , < a class = "el" href = "close_8c_source.html#l01810" > write_dvd_long_sector_blocks()< / a > , < a class = "el" href = "close_8c_source.html#l02247" > write_dvd_title_key_decrypted_block()< / a > , < a class = "el" href = "close_8c_source.html#l02411" > write_media_tags()< / a > , < a class = "el" href = "close_8c_source.html#l00850" > write_mode2_subheaders_block()< / a > , < a class = "el" href = "close_8c_source.html#l00966" > write_sector_prefix()< / a > , < a class = "el" href = "close_8c_source.html#l01508" > write_sector_subchannel()< / a > , and < a class = "el" href = "close_8c_source.html#l01088" > write_sector_suffix()< / a > .< / p >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a5bd50f95c8c1f91e5013a1a154690beb" > ◆   < / a > < / span > sectorSize< / h2 >
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< td class = "memname" > uint32_t BlockHeader::sectorSize< / td >
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< p > Size in bytes of each logical sector represented in this block. < / p >
< p class = "definition" > Definition at line < a class = "el" href = "data_8h_source.html#l00075" > 75< / a > of file < a class = "el" href = "data_8h_source.html" > data.h< / a > .< / p >
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< p class = "reference" > Referenced by < a class = "el" href = "write_8c_source.html#l01403" > aaruf_close_current_block()< / a > , < a class = "el" href = "read_8c_source.html#l00253" > aaruf_read_sector()< / a > , < a class = "el" href = "write_8c_source.html#l00098" > aaruf_write_sector()< / a > , and < a class = "el" href = "data_8c_source.html#l00071" > process_data_block()< / a > .< / p >
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< a id = "ac31ad48f3362a43175c94ec2e30662ad" name = "ac31ad48f3362a43175c94ec2e30662ad" > < / a >
< h2 class = "memtitle" > < span class = "permalink" > < a href = "#ac31ad48f3362a43175c94ec2e30662ad" > ◆   < / a > < / span > type< / h2 >
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< td class = "memname" > uint16_t BlockHeader::type< / td >
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< p > Logical data classification (value from < a class = "el" href = "enums_8h.html#ad8ed01ff3ff33333d8e19db4d2818bb6" > DataType< / a > ). < / p >
< p class = "definition" > Definition at line < a class = "el" href = "data_8h_source.html#l00073" > 73< / a > of file < a class = "el" href = "data_8h_source.html" > data.h< / a > .< / p >
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< p class = "reference" > Referenced by < a class = "el" href = "write_8c_source.html#l00098" > aaruf_write_sector()< / a > , < a class = "el" href = "data_8c_source.html#l00071" > process_data_block()< / a > , < a class = "el" href = "close_8c_source.html#l01810" > write_dvd_long_sector_blocks()< / a > , < a class = "el" href = "close_8c_source.html#l02247" > write_dvd_title_key_decrypted_block()< / a > , < a class = "el" href = "close_8c_source.html#l02411" > write_media_tags()< / a > , < a class = "el" href = "close_8c_source.html#l00850" > write_mode2_subheaders_block()< / a > , < a class = "el" href = "close_8c_source.html#l00966" > write_sector_prefix()< / a > , < a class = "el" href = "close_8c_source.html#l01508" > write_sector_subchannel()< / a > , and < a class = "el" href = "close_8c_source.html#l01088" > write_sector_suffix()< / a > .< / p >
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< hr / > The documentation for this struct was generated from the following file:< ul >
< li > include/aaruformat/structs/< a class = "el" href = "data_8h_source.html" > data.h< / a > < / li >
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< li class = "navelem" > < a href = "structBlockHeader.html" > BlockHeader< / a > < / li >
< li class = "footer" > Generated by < a href = "https://www.doxygen.org/index.html" > < img class = "footer" src = "doxygen.svg" width = "104" height = "31" alt = "doxygen" / > < / a > 1.14.0 < / li >
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