linux/lib/zlib_dfltcc/dfltcc.c
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   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
   9char *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
  26void 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}
  57EXPORT_SYMBOL(dfltcc_reset);
  58
  59MODULE_LICENSE("GPL");
  60