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155 lines
5.1 KiB
155 lines
5.1 KiB
// SPDX-License-Identifier: Zlib |
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#ifndef DFLTCC_H |
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#define DFLTCC_H |
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#include "../zlib_deflate/defutil.h" |
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#include <asm/facility.h> |
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#include <asm/setup.h> |
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/* |
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* Tuning parameters. |
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*/ |
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#define DFLTCC_LEVEL_MASK 0x2 /* DFLTCC compression for level 1 only */ |
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#define DFLTCC_LEVEL_MASK_DEBUG 0x3fe /* DFLTCC compression for all levels */ |
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#define DFLTCC_BLOCK_SIZE 1048576 |
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#define DFLTCC_FIRST_FHT_BLOCK_SIZE 4096 |
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#define DFLTCC_DHT_MIN_SAMPLE_SIZE 4096 |
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#define DFLTCC_RIBM 0 |
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#define DFLTCC_FACILITY 151 |
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/* |
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* Parameter Block for Query Available Functions. |
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*/ |
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struct dfltcc_qaf_param { |
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char fns[16]; |
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char reserved1[8]; |
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char fmts[2]; |
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char reserved2[6]; |
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}; |
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static_assert(sizeof(struct dfltcc_qaf_param) == 32); |
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#define DFLTCC_FMT0 0 |
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/* |
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* Parameter Block for Generate Dynamic-Huffman Table, Compress and Expand. |
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*/ |
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struct dfltcc_param_v0 { |
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uint16_t pbvn; /* Parameter-Block-Version Number */ |
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uint8_t mvn; /* Model-Version Number */ |
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uint8_t ribm; /* Reserved for IBM use */ |
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unsigned reserved32 : 31; |
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unsigned cf : 1; /* Continuation Flag */ |
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uint8_t reserved64[8]; |
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unsigned nt : 1; /* New Task */ |
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unsigned reserved129 : 1; |
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unsigned cvt : 1; /* Check Value Type */ |
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unsigned reserved131 : 1; |
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unsigned htt : 1; /* Huffman-Table Type */ |
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unsigned bcf : 1; /* Block-Continuation Flag */ |
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unsigned bcc : 1; /* Block Closing Control */ |
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unsigned bhf : 1; /* Block Header Final */ |
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unsigned reserved136 : 1; |
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unsigned reserved137 : 1; |
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unsigned dhtgc : 1; /* DHT Generation Control */ |
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unsigned reserved139 : 5; |
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unsigned reserved144 : 5; |
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unsigned sbb : 3; /* Sub-Byte Boundary */ |
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uint8_t oesc; /* Operation-Ending-Supplemental Code */ |
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unsigned reserved160 : 12; |
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unsigned ifs : 4; /* Incomplete-Function Status */ |
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uint16_t ifl; /* Incomplete-Function Length */ |
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uint8_t reserved192[8]; |
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uint8_t reserved256[8]; |
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uint8_t reserved320[4]; |
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uint16_t hl; /* History Length */ |
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unsigned reserved368 : 1; |
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uint16_t ho : 15; /* History Offset */ |
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uint32_t cv; /* Check Value */ |
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unsigned eobs : 15; /* End-of-block Symbol */ |
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unsigned reserved431: 1; |
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uint8_t eobl : 4; /* End-of-block Length */ |
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unsigned reserved436 : 12; |
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unsigned reserved448 : 4; |
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uint16_t cdhtl : 12; /* Compressed-Dynamic-Huffman Table |
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Length */ |
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uint8_t reserved464[6]; |
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uint8_t cdht[288]; |
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uint8_t reserved[32]; |
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uint8_t csb[1152]; |
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}; |
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static_assert(sizeof(struct dfltcc_param_v0) == 1536); |
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#define CVT_CRC32 0 |
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#define CVT_ADLER32 1 |
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#define HTT_FIXED 0 |
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#define HTT_DYNAMIC 1 |
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/* |
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* Extension of inflate_state and deflate_state for DFLTCC. |
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*/ |
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struct dfltcc_state { |
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struct dfltcc_param_v0 param; /* Parameter block */ |
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struct dfltcc_qaf_param af; /* Available functions */ |
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uLong level_mask; /* Levels on which to use DFLTCC */ |
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uLong block_size; /* New block each X bytes */ |
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uLong block_threshold; /* New block after total_in > X */ |
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uLong dht_threshold; /* New block only if avail_in >= X */ |
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char msg[64]; /* Buffer for strm->msg */ |
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}; |
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/* Resides right after inflate_state or deflate_state */ |
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#define GET_DFLTCC_STATE(state) ((struct dfltcc_state *)((state) + 1)) |
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/* External functions */ |
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int dfltcc_can_deflate(z_streamp strm); |
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int dfltcc_deflate(z_streamp strm, |
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int flush, |
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block_state *result); |
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void dfltcc_reset(z_streamp strm, uInt size); |
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int dfltcc_can_inflate(z_streamp strm); |
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typedef enum { |
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DFLTCC_INFLATE_CONTINUE, |
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DFLTCC_INFLATE_BREAK, |
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DFLTCC_INFLATE_SOFTWARE, |
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} dfltcc_inflate_action; |
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dfltcc_inflate_action dfltcc_inflate(z_streamp strm, |
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int flush, int *ret); |
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static inline int is_dfltcc_enabled(void) |
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{ |
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return (zlib_dfltcc_support != ZLIB_DFLTCC_DISABLED && |
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test_facility(DFLTCC_FACILITY)); |
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} |
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#define DEFLATE_RESET_HOOK(strm) \ |
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dfltcc_reset((strm), sizeof(deflate_state)) |
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#define DEFLATE_HOOK dfltcc_deflate |
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#define DEFLATE_NEED_CHECKSUM(strm) (!dfltcc_can_deflate((strm))) |
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#define DEFLATE_DFLTCC_ENABLED() is_dfltcc_enabled() |
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#define INFLATE_RESET_HOOK(strm) \ |
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dfltcc_reset((strm), sizeof(struct inflate_state)) |
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#define INFLATE_TYPEDO_HOOK(strm, flush) \ |
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if (dfltcc_can_inflate((strm))) { \ |
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dfltcc_inflate_action action; \ |
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\ |
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RESTORE(); \ |
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action = dfltcc_inflate((strm), (flush), &ret); \ |
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LOAD(); \ |
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if (action == DFLTCC_INFLATE_CONTINUE) \ |
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break; \ |
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else if (action == DFLTCC_INFLATE_BREAK) \ |
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goto inf_leave; \ |
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} |
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#define INFLATE_NEED_CHECKSUM(strm) (!dfltcc_can_inflate((strm))) |
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#define INFLATE_NEED_UPDATEWINDOW(strm) (!dfltcc_can_inflate((strm))) |
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#endif /* DFLTCC_H */
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