lib/zlib_dfltcc/dfltcc.c

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