156 lines
5.1 KiB
C
156 lines
5.1 KiB
C
// 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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