lib/zlib_dfltcc/dfltcc.c

   1 // SPDX-License-Identifier: Zlib
   2 /* dfltcc.c - SystemZ DEFLATE CONVERSION CALL support. */
   3
   4 #include <linux/export.h>
   5 #include <linux/module.h>
   6 #include "dfltcc_util.h"
   7 #include "dfltcc.h"
   8
   9 char *oesc_msg(
  10     char *buf,
  11     int oesc
  12 )
  13 {
  14     if (oesc == 0x00)
  15         return NULL; /* Successful completion */
  16     else {
  17 #ifdef STATIC
  18         return NULL; /* Ignore for pre-boot decompressor */
  19 #else
  20         sprintf(buf, "Operation-Ending-Supplemental Code is 0x%.2X", oesc);
  21         return buf;
  22 #endif
  23     }
  24 }
  25
  26 void dfltcc_reset(
  27     z_streamp strm,
  28     uInt size
  29 )
  30 {
  31     struct dfltcc_state *dfltcc_state =
  32         (struct dfltcc_state *)((char *)strm->state + size);
  33     struct dfltcc_qaf_param *param =
  34         (struct dfltcc_qaf_param *)&dfltcc_state->param;
  35
  36     /* Initialize available functions */
  37     if (is_dfltcc_enabled()) {
  38         dfltcc(DFLTCC_QAF, param, NULL, NULL, NULL, NULL, NULL);
  39         memmove(&dfltcc_state->af, param, sizeof(dfltcc_state->af));
  40     } else
  41         memset(&dfltcc_state->af, 0, sizeof(dfltcc_state->af));
  42
  43     /* Initialize parameter block */
  44     memset(&dfltcc_state->param, 0, sizeof(dfltcc_state->param));
  45     dfltcc_state->param.nt = 1;
  46
  47     /* Initialize tuning parameters */
  48     if (zlib_dfltcc_support == ZLIB_DFLTCC_FULL_DEBUG)
  49         dfltcc_state->level_mask = DFLTCC_LEVEL_MASK_DEBUG;
  50     else
  51         dfltcc_state->level_mask = DFLTCC_LEVEL_MASK;
  52     dfltcc_state->block_size = DFLTCC_BLOCK_SIZE;
  53     dfltcc_state->block_threshold = DFLTCC_FIRST_FHT_BLOCK_SIZE;
  54     dfltcc_state->dht_threshold = DFLTCC_DHT_MIN_SAMPLE_SIZE;
  55     dfltcc_state->param.ribm = DFLTCC_RIBM;
  56 }
  57 EXPORT_SYMBOL(dfltcc_reset);
  58
  59 MODULE_LICENSE("GPL");