Function get_decomp_buf

internal/cbm/ac.c:258–267

static CBM_TLS int tls_decomp_cap = 0;

static char *get_decomp_buf(int needed) {
    if (needed > tls_decomp_cap) {
        free(tls_decomp_buf);
        // Round up to 64KB chunks for reuse.
        int cap = (needed + DECOMP_BUF_ALIGN_MASK) & ~DECOMP_BUF_ALIGN_MASK;
        tls_decomp_buf = (cap > 0) ? (char *)malloc((size_t)cap) : NULL;
        tls_decomp_cap = cap;
    }
    return tls_decomp_buf;
}

// cbm_ac_scan_lz4_bitmask decompresses LZ4 data into a thread-local buffer
// and scans it through the AC automaton. Returns bitmask of matched patterns.