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