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- // SPDX-License-Identifier: Zlib
- #ifndef DFLTCC_UTIL_H
- #define DFLTCC_UTIL_H
- #include <linux/zutil.h>
- /*
- * C wrapper for the DEFLATE CONVERSION CALL instruction.
- */
- typedef enum {
- DFLTCC_CC_OK = 0,
- DFLTCC_CC_OP1_TOO_SHORT = 1,
- DFLTCC_CC_OP2_TOO_SHORT = 2,
- DFLTCC_CC_OP2_CORRUPT = 2,
- DFLTCC_CC_AGAIN = 3,
- } dfltcc_cc;
- #define DFLTCC_QAF 0
- #define DFLTCC_GDHT 1
- #define DFLTCC_CMPR 2
- #define DFLTCC_XPND 4
- #define HBT_CIRCULAR (1 << 7)
- #define HB_BITS 15
- #define HB_SIZE (1 << HB_BITS)
- static inline dfltcc_cc dfltcc(
- int fn,
- void *param,
- Byte **op1,
- size_t *len1,
- const Byte **op2,
- size_t *len2,
- void *hist
- )
- {
- Byte *t2 = op1 ? *op1 : NULL;
- size_t t3 = len1 ? *len1 : 0;
- const Byte *t4 = op2 ? *op2 : NULL;
- size_t t5 = len2 ? *len2 : 0;
- register int r0 __asm__("r0") = fn;
- register void *r1 __asm__("r1") = param;
- register Byte *r2 __asm__("r2") = t2;
- register size_t r3 __asm__("r3") = t3;
- register const Byte *r4 __asm__("r4") = t4;
- register size_t r5 __asm__("r5") = t5;
- int cc;
- __asm__ volatile(
- ".insn rrf,0xb9390000,%[r2],%[r4],%[hist],0\n"
- "ipm %[cc]\n"
- : [r2] "+r" (r2)
- , [r3] "+r" (r3)
- , [r4] "+r" (r4)
- , [r5] "+r" (r5)
- , [cc] "=r" (cc)
- : [r0] "r" (r0)
- , [r1] "r" (r1)
- , [hist] "r" (hist)
- : "cc", "memory");
- t2 = r2; t3 = r3; t4 = r4; t5 = r5;
- if (op1)
- *op1 = t2;
- if (len1)
- *len1 = t3;
- if (op2)
- *op2 = t4;
- if (len2)
- *len2 = t5;
- return (cc >> 28) & 3;
- }
- static inline int is_bit_set(
- const char *bits,
- int n
- )
- {
- return bits[n / 8] & (1 << (7 - (n % 8)));
- }
- static inline void turn_bit_off(
- char *bits,
- int n
- )
- {
- bits[n / 8] &= ~(1 << (7 - (n % 8)));
- }
- static inline int dfltcc_are_params_ok(
- int level,
- uInt window_bits,
- int strategy,
- uLong level_mask
- )
- {
- return (level_mask & (1 << level)) != 0 &&
- (window_bits == HB_BITS) &&
- (strategy == Z_DEFAULT_STRATEGY);
- }
- char *oesc_msg(char *buf, int oesc);
- #endif /* DFLTCC_UTIL_H */
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