Move various compression libraries into single subdirectory

This improves the organization of the cpukit.

Closes #4912.

1 files changed, 0 insertions, 1125 deletions

diff --git a/cpukit/zlib/crc32.c b/cpukit/zlib/crc32.c
deleted file mode 100644
index f8357b083f..0000000000
--- a/cpukit/zlib/crc32.c
+++ /dev/null
@@ -1,1125 +0,0 @@
-/* crc32.c -- compute the CRC-32 of a data stream
- * Copyright (C) 1995-2022 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- *
- * This interleaved implementation of a CRC makes use of pipelined multiple
- * arithmetic-logic units, commonly found in modern CPU cores. It is due to
- * Kadatch and Jenkins (2010). See doc/crc-doc.1.0.pdf in this distribution.
- */
-
-/* @(#) $Id$ */
-
-/*
-  Note on the use of DYNAMIC_CRC_TABLE: there is no mutex or semaphore
-  protection on the static variables used to control the first-use generation
-  of the crc tables. Therefore, if you #define DYNAMIC_CRC_TABLE, you should
-  first call get_crc_table() to initialize the tables before allowing more than
-  one thread to use crc32().
-
-  MAKECRCH can be #defined to write out crc32.h. A main() routine is also
-  produced, so that this one source file can be compiled to an executable.
- */
-
-#ifdef MAKECRCH
-#  include <stdio.h>
-#  ifndef DYNAMIC_CRC_TABLE
-#    define DYNAMIC_CRC_TABLE
-#  endif /* !DYNAMIC_CRC_TABLE */
-#endif /* MAKECRCH */
-
-#include "zutil.h"      /* for Z_U4, Z_U8, z_crc_t, and FAR definitions */
-
- /*
-  A CRC of a message is computed on N braids of words in the message, where
-  each word consists of W bytes (4 or 8). If N is 3, for example, then three
-  running sparse CRCs are calculated respectively on each braid, at these
-  indices in the array of words: 0, 3, 6, ..., 1, 4, 7, ..., and 2, 5, 8, ...
-  This is done starting at a word boundary, and continues until as many blocks
-  of N * W bytes as are available have been processed. The results are combined
-  into a single CRC at the end. For this code, N must be in the range 1..6 and
-  W must be 4 or 8. The upper limit on N can be increased if desired by adding
-  more #if blocks, extending the patterns apparent in the code. In addition,
-  crc32.h would need to be regenerated, if the maximum N value is increased.
-
-  N and W are chosen empirically by benchmarking the execution time on a given
-  processor. The choices for N and W below were based on testing on Intel Kaby
-  Lake i7, AMD Ryzen 7, ARM Cortex-A57, Sparc64-VII, PowerPC POWER9, and MIPS64
-  Octeon II processors. The Intel, AMD, and ARM processors were all fastest
-  with N=5, W=8. The Sparc, PowerPC, and MIPS64 were all fastest at N=5, W=4.
-  They were all tested with either gcc or clang, all using the -O3 optimization
-  level. Your mileage may vary.
- */
-
-/* Define N */
-#ifdef Z_TESTN
-#  define N Z_TESTN
-#else
-#  define N 5
-#endif
-#if N < 1 || N > 6
-#  error N must be in 1..6
-#endif
-
-/*
-  z_crc_t must be at least 32 bits. z_word_t must be at least as long as
-  z_crc_t. It is assumed here that z_word_t is either 32 bits or 64 bits, and
-  that bytes are eight bits.
- */
-
-/*
-  Define W and the associated z_word_t type. If W is not defined, then a
-  braided calculation is not used, and the associated tables and code are not
-  compiled.
- */
-#ifdef Z_TESTW
-#  if Z_TESTW-1 != -1
-#    define W Z_TESTW
-#  endif
-#else
-#  ifdef MAKECRCH
-#    define W 8         /* required for MAKECRCH */
-#  else
-#    if defined(__x86_64__) || defined(__aarch64__)
-#      define W 8
-#    else
-#      define W 4
-#    endif
-#  endif
-#endif
-#ifdef W
-#  if W == 8 && defined(Z_U8)
-     typedef Z_U8 z_word_t;
-#  elif defined(Z_U4)
-#    undef W
-#    define W 4
-     typedef Z_U4 z_word_t;
-#  else
-#    undef W
-#  endif
-#endif
-
-/* If available, use the ARM processor CRC32 instruction. */
-#if defined(__aarch64__) && defined(__ARM_FEATURE_CRC32) && W == 8
-#  define ARMCRC32
-#endif
-
-/* Local functions. */
-local z_crc_t multmodp OF((z_crc_t a, z_crc_t b));
-local z_crc_t x2nmodp OF((z_off64_t n, unsigned k));
-
-#if defined(W) && (!defined(ARMCRC32) || defined(DYNAMIC_CRC_TABLE))
-    local z_word_t byte_swap OF((z_word_t word));
-#endif
-
-#if defined(W) && !defined(ARMCRC32)
-    local z_crc_t crc_word OF((z_word_t data));
-    local z_word_t crc_word_big OF((z_word_t data));
-#endif
-
-#if defined(W) && (!defined(ARMCRC32) || defined(DYNAMIC_CRC_TABLE))
-/*
-  Swap the bytes in a z_word_t to convert between little and big endian. Any
-  self-respecting compiler will optimize this to a single machine byte-swap
-  instruction, if one is available. This assumes that word_t is either 32 bits
-  or 64 bits.
- */
-local z_word_t byte_swap(word)
-    z_word_t word;
-{
-#  if W == 8
-    return
-        (word & 0xff00000000000000) >> 56 |
-        (word & 0xff000000000000) >> 40 |
-        (word & 0xff0000000000) >> 24 |
-        (word & 0xff00000000) >> 8 |
-        (word & 0xff000000) << 8 |
-        (word & 0xff0000) << 24 |
-        (word & 0xff00) << 40 |
-        (word & 0xff) << 56;
-#  else   /* W == 4 */
-    return
-        (word & 0xff000000) >> 24 |
-        (word & 0xff0000) >> 8 |
-        (word & 0xff00) << 8 |
-        (word & 0xff) << 24;
-#  endif
-}
-#endif
-
-/* CRC polynomial. */
-#define POLY 0xedb88320         /* p(x) reflected, with x^32 implied */
-
-#ifdef DYNAMIC_CRC_TABLE
-
-local z_crc_t FAR crc_table[256];
-local z_crc_t FAR x2n_table[32];
-local void make_crc_table OF((void));
-#ifdef W
-   local z_word_t FAR crc_big_table[256];
-   local z_crc_t FAR crc_braid_table[W][256];
-   local z_word_t FAR crc_braid_big_table[W][256];
-   local void braid OF((z_crc_t [][256], z_word_t [][256], int, int));
-#endif
-#ifdef MAKECRCH
-   local void write_table OF((FILE *, const z_crc_t FAR *, int));
-   local void write_table32hi OF((FILE *, const z_word_t FAR *, int));
-   local void write_table64 OF((FILE *, const z_word_t FAR *, int));
-#endif /* MAKECRCH */
-
-/*
-  Define a once() function depending on the availability of atomics. If this is
-  compiled with DYNAMIC_CRC_TABLE defined, and if CRCs will be computed in
-  multiple threads, and if atomics are not available, then get_crc_table() must
-  be called to initialize the tables and must return before any threads are
-  allowed to compute or combine CRCs.
- */
-
-/* Definition of once functionality. */
-typedef struct once_s once_t;
-local void once OF((once_t *, void (*)(void)));
-
-/* Check for the availability of atomics. */
-#if defined(__STDC__) && __STDC_VERSION__ >= 201112L && \
-    !defined(__STDC_NO_ATOMICS__)
-
-#include <stdatomic.h>
-
-/* Structure for once(), which must be initialized with ONCE_INIT. */
-struct once_s {
-    atomic_flag begun;
-    atomic_int done;
-};
-#define ONCE_INIT {ATOMIC_FLAG_INIT, 0}
-
-/*
-  Run the provided init() function exactly once, even if multiple threads
-  invoke once() at the same time. The state must be a once_t initialized with
-  ONCE_INIT.
- */
-local void once(state, init)
-    once_t *state;
-    void (*init)(void);
-{
-    if (!atomic_load(&state->done)) {
-        if (atomic_flag_test_and_set(&state->begun))
-            while (!atomic_load(&state->done))
-                ;
-        else {
-            init();
-            atomic_store(&state->done, 1);
-        }
-    }
-}
-
-#else   /* no atomics */
-
-/* Structure for once(), which must be initialized with ONCE_INIT. */
-struct once_s {
-    volatile int begun;
-    volatile int done;
-};
-#define ONCE_INIT {0, 0}
-
-/* Test and set. Alas, not atomic, but tries to minimize the period of
-   vulnerability. */
-local int test_and_set OF((int volatile *));
-local int test_and_set(flag)
-    int volatile *flag;
-{
-    int was;
-
-    was = *flag;
-    *flag = 1;
-    return was;
-}
-
-/* Run the provided init() function once. This is not thread-safe. */
-local void once(state, init)
-    once_t *state;
-    void (*init)(void);
-{
-    if (!state->done) {
-        if (test_and_set(&state->begun))
-            while (!state->done)
-                ;
-        else {
-            init();
-            state->done = 1;
-        }
-    }
-}
-
-#endif
-
-/* State for once(). */
-local once_t made = ONCE_INIT;
-
-/*
-  Generate tables for a byte-wise 32-bit CRC calculation on the polynomial:
-  x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1.
-
-  Polynomials over GF(2) are represented in binary, one bit per coefficient,
-  with the lowest powers in the most significant bit. Then adding polynomials
-  is just exclusive-or, and multiplying a polynomial by x is a right shift by
-  one. If we call the above polynomial p, and represent a byte as the
-  polynomial q, also with the lowest power in the most significant bit (so the
-  byte 0xb1 is the polynomial x^7+x^3+x^2+1), then the CRC is (q*x^32) mod p,
-  where a mod b means the remainder after dividing a by b.
-
-  This calculation is done using the shift-register method of multiplying and
-  taking the remainder. The register is initialized to zero, and for each
-  incoming bit, x^32 is added mod p to the register if the bit is a one (where
-  x^32 mod p is p+x^32 = x^26+...+1), and the register is multiplied mod p by x
-  (which is shifting right by one and adding x^32 mod p if the bit shifted out
-  is a one). We start with the highest power (least significant bit) of q and
-  repeat for all eight bits of q.
-
-  The table is simply the CRC of all possible eight bit values. This is all the
-  information needed to generate CRCs on data a byte at a time for all
-  combinations of CRC register values and incoming bytes.
- */
-
-local void make_crc_table()
-{
-    unsigned i, j, n;
-    z_crc_t p;
-
-    /* initialize the CRC of bytes tables */
-    for (i = 0; i < 256; i++) {
-        p = i;
-        for (j = 0; j < 8; j++)
-            p = p & 1 ? (p >> 1) ^ POLY : p >> 1;
-        crc_table[i] = p;
-#ifdef W
-        crc_big_table[i] = byte_swap(p);
-#endif
-    }
-
-    /* initialize the x^2^n mod p(x) table */
-    p = (z_crc_t)1 << 30;         /* x^1 */
-    x2n_table[0] = p;
-    for (n = 1; n < 32; n++)
-        x2n_table[n] = p = multmodp(p, p);
-
-#ifdef W
-    /* initialize the braiding tables -- needs x2n_table[] */
-    braid(crc_braid_table, crc_braid_big_table, N, W);
-#endif
-
-#ifdef MAKECRCH
-    {
-        /*
-          The crc32.h header file contains tables for both 32-bit and 64-bit
-          z_word_t's, and so requires a 64-bit type be available. In that case,
-          z_word_t must be defined to be 64-bits. This code then also generates
-          and writes out the tables for the case that z_word_t is 32 bits.
-         */
-#if !defined(W) || W != 8
-#  error Need a 64-bit integer type in order to generate crc32.h.
-#endif
-        FILE *out;
-        int k, n;
-        z_crc_t ltl[8][256];
-        z_word_t big[8][256];
-
-        out = fopen("crc32.h", "w");
-        if (out == NULL) return;
-
-        /* write out little-endian CRC table to crc32.h */
-        fprintf(out,
-            "/* crc32.h -- tables for rapid CRC calculation\n"
-            " * Generated automatically by crc32.c\n */\n"
-            "\n"
-            "local const z_crc_t FAR crc_table[] = {\n"
-            "    ");
-        write_table(out, crc_table, 256);
-        fprintf(out,
-            "};\n");
-
-        /* write out big-endian CRC table for 64-bit z_word_t to crc32.h */
-        fprintf(out,
-            "\n"
-            "#ifdef W\n"
-            "\n"
-            "#if W == 8\n"
-            "\n"
-            "local const z_word_t FAR crc_big_table[] = {\n"
-            "    ");
-        write_table64(out, crc_big_table, 256);
-        fprintf(out,
-            "};\n");
-
-        /* write out big-endian CRC table for 32-bit z_word_t to crc32.h */
-        fprintf(out,
-            "\n"
-            "#else /* W == 4 */\n"
-            "\n"
-            "local const z_word_t FAR crc_big_table[] = {\n"
-            "    ");
-        write_table32hi(out, crc_big_table, 256);
-        fprintf(out,
-            "};\n"
-            "\n"
-            "#endif\n");
-
-        /* write out braid tables for each value of N */
-        for (n = 1; n <= 6; n++) {
-            fprintf(out,
-            "\n"
-            "#if N == %d\n", n);
-
-            /* compute braid tables for this N and 64-bit word_t */
-            braid(ltl, big, n, 8);
-
-            /* write out braid tables for 64-bit z_word_t to crc32.h */
-            fprintf(out,
-            "\n"
-            "#if W == 8\n"
-            "\n"
-            "local const z_crc_t FAR crc_braid_table[][256] = {\n");
-            for (k = 0; k < 8; k++) {
-                fprintf(out, "   {");
-                write_table(out, ltl[k], 256);
-                fprintf(out, "}%s", k < 7 ? ",\n" : "");
-            }
-            fprintf(out,
-            "};\n"
-            "\n"
-            "local const z_word_t FAR crc_braid_big_table[][256] = {\n");
-            for (k = 0; k < 8; k++) {
-                fprintf(out, "   {");
-                write_table64(out, big[k], 256);
-                fprintf(out, "}%s", k < 7 ? ",\n" : "");
-            }
-            fprintf(out,
-            "};\n");
-
-            /* compute braid tables for this N and 32-bit word_t */
-            braid(ltl, big, n, 4);
-
-            /* write out braid tables for 32-bit z_word_t to crc32.h */
-            fprintf(out,
-            "\n"
-            "#else /* W == 4 */\n"
-            "\n"
-            "local const z_crc_t FAR crc_braid_table[][256] = {\n");
-            for (k = 0; k < 4; k++) {
-                fprintf(out, "   {");
-                write_table(out, ltl[k], 256);
-                fprintf(out, "}%s", k < 3 ? ",\n" : "");
-            }
-            fprintf(out,
-            "};\n"
-            "\n"
-            "local const z_word_t FAR crc_braid_big_table[][256] = {\n");
-            for (k = 0; k < 4; k++) {
-                fprintf(out, "   {");
-                write_table32hi(out, big[k], 256);
-                fprintf(out, "}%s", k < 3 ? ",\n" : "");
-            }
-            fprintf(out,
-            "};\n"
-            "\n"
-            "#endif\n"
-            "\n"
-            "#endif\n");
-        }
-        fprintf(out,
-            "\n"
-            "#endif\n");
-
-        /* write out zeros operator table to crc32.h */
-        fprintf(out,
-            "\n"
-            "local const z_crc_t FAR x2n_table[] = {\n"
-            "    ");
-        write_table(out, x2n_table, 32);
-        fprintf(out,
-            "};\n");
-        fclose(out);
-    }
-#endif /* MAKECRCH */
-}
-
-#ifdef MAKECRCH
-
-/*
-   Write the 32-bit values in table[0..k-1] to out, five per line in
-   hexadecimal separated by commas.
- */
-local void write_table(out, table, k)
-    FILE *out;
-    const z_crc_t FAR *table;
-    int k;
-{
-    int n;
-
-    for (n = 0; n < k; n++)
-        fprintf(out, "%s0x%08lx%s", n == 0 || n % 5 ? "" : "    ",
-                (unsigned long)(table[n]),
-                n == k - 1 ? "" : (n % 5 == 4 ? ",\n" : ", "));
-}
-
-/*
-   Write the high 32-bits of each value in table[0..k-1] to out, five per line
-   in hexadecimal separated by commas.
- */
-local void write_table32hi(out, table, k)
-FILE *out;
-const z_word_t FAR *table;
-int k;
-{
-    int n;
-
-    for (n = 0; n < k; n++)
-        fprintf(out, "%s0x%08lx%s", n == 0 || n % 5 ? "" : "    ",
-                (unsigned long)(table[n] >> 32),
-                n == k - 1 ? "" : (n % 5 == 4 ? ",\n" : ", "));
-}
-
-/*
-  Write the 64-bit values in table[0..k-1] to out, three per line in
-  hexadecimal separated by commas. This assumes that if there is a 64-bit
-  type, then there is also a long long integer type, and it is at least 64
-  bits. If not, then the type cast and format string can be adjusted
-  accordingly.
- */
-local void write_table64(out, table, k)
-    FILE *out;
-    const z_word_t FAR *table;
-    int k;
-{
-    int n;
-
-    for (n = 0; n < k; n++)
-        fprintf(out, "%s0x%016llx%s", n == 0 || n % 3 ? "" : "    ",
-                (unsigned long long)(table[n]),
-                n == k - 1 ? "" : (n % 3 == 2 ? ",\n" : ", "));
-}
-
-/* Actually do the deed. */
-int main()
-{
-    make_crc_table();
-    return 0;
-}
-
-#endif /* MAKECRCH */
-
-#ifdef W
-/*
-  Generate the little and big-endian braid tables for the given n and z_word_t
-  size w. Each array must have room for w blocks of 256 elements.
- */
-local void braid(ltl, big, n, w)
-    z_crc_t ltl[][256];
-    z_word_t big[][256];
-    int n;
-    int w;
-{
-    int k;
-    z_crc_t i, p, q;
-    for (k = 0; k < w; k++) {
-        p = x2nmodp((n * w + 3 - k) << 3, 0);
-        ltl[k][0] = 0;
-        big[w - 1 - k][0] = 0;
-        for (i = 1; i < 256; i++) {
-            ltl[k][i] = q = multmodp(i << 24, p);
-            big[w - 1 - k][i] = byte_swap(q);
-        }
-    }
-}
-#endif
-
-#else /* !DYNAMIC_CRC_TABLE */
-/* ========================================================================
- * Tables for byte-wise and braided CRC-32 calculations, and a table of powers
- * of x for combining CRC-32s, all made by make_crc_table().
- */
-#include "crc32.h"
-#endif /* DYNAMIC_CRC_TABLE */
-
-/* ========================================================================
- * Routines used for CRC calculation. Some are also required for the table
- * generation above.
- */
-
-/*
-  Return a(x) multiplied by b(x) modulo p(x), where p(x) is the CRC polynomial,
-  reflected. For speed, this requires that a not be zero.
- */
-local z_crc_t multmodp(a, b)
-    z_crc_t a;
-    z_crc_t b;
-{
-    z_crc_t m, p;
-
-    m = (z_crc_t)1 << 31;
-    p = 0;
-    for (;;) {
-        if (a & m) {
-            p ^= b;
-            if ((a & (m - 1)) == 0)
-                break;
-        }
-        m >>= 1;
-        b = b & 1 ? (b >> 1) ^ POLY : b >> 1;
-    }
-    return p;
-}
-
-/*
-  Return x^(n * 2^k) modulo p(x). Requires that x2n_table[] has been
-  initialized.
- */
-local z_crc_t x2nmodp(n, k)
-    z_off64_t n;
-    unsigned k;
-{
-    z_crc_t p;
-
-    p = (z_crc_t)1 << 31;           /* x^0 == 1 */
-    while (n) {
-        if (n & 1)
-            p = multmodp(x2n_table[k & 31], p);
-        n >>= 1;
-        k++;
-    }
-    return p;
-}
-
-/* =========================================================================
- * This function can be used by asm versions of crc32(), and to force the
- * generation of the CRC tables in a threaded application.
- */
-const z_crc_t FAR * ZEXPORT get_crc_table()
-{
-#ifdef DYNAMIC_CRC_TABLE
-    once(&made, make_crc_table);
-#endif /* DYNAMIC_CRC_TABLE */
-    return (const z_crc_t FAR *)crc_table;
-}
-
-/* =========================================================================
- * Use ARM machine instructions if available. This will compute the CRC about
- * ten times faster than the braided calculation. This code does not check for
- * the presence of the CRC instruction at run time. __ARM_FEATURE_CRC32 will
- * only be defined if the compilation specifies an ARM processor architecture
- * that has the instructions. For example, compiling with -march=armv8.1-a or
- * -march=armv8-a+crc, or -march=native if the compile machine has the crc32
- * instructions.
- */
-#ifdef ARMCRC32
-
-/*
-   Constants empirically determined to maximize speed. These values are from
-   measurements on a Cortex-A57. Your mileage may vary.
- */
-#define Z_BATCH 3990                /* number of words in a batch */
-#define Z_BATCH_ZEROS 0xa10d3d0c    /* computed from Z_BATCH = 3990 */
-#define Z_BATCH_MIN 800             /* fewest words in a final batch */
-
-unsigned long ZEXPORT crc32_z(crc, buf, len)
-    unsigned long crc;
-    const unsigned char FAR *buf;
-    z_size_t len;
-{
-    z_crc_t val;
-    z_word_t crc1, crc2;
-    const z_word_t *word;
-    z_word_t val0, val1, val2;
-    z_size_t last, last2, i;
-    z_size_t num;
-
-    /* Return initial CRC, if requested. */
-    if (buf == Z_NULL) return 0;
-
-#ifdef DYNAMIC_CRC_TABLE
-    once(&made, make_crc_table);
-#endif /* DYNAMIC_CRC_TABLE */
-
-    /* Pre-condition the CRC */
-    crc = (~crc) & 0xffffffff;
-
-    /* Compute the CRC up to a word boundary. */
-    while (len && ((z_size_t)buf & 7) != 0) {
-        len--;
-        val = *buf++;
-        __asm__ volatile("crc32b %w0, %w0, %w1" : "+r"(crc) : "r"(val));
-    }
-
-    /* Prepare to compute the CRC on full 64-bit words word[0..num-1]. */
-    word = (z_word_t const *)buf;
-    num = len >> 3;
-    len &= 7;
-
-    /* Do three interleaved CRCs to realize the throughput of one crc32x
-       instruction per cycle. Each CRC is calculated on Z_BATCH words. The
-       three CRCs are combined into a single CRC after each set of batches. */
-    while (num >= 3 * Z_BATCH) {
-        crc1 = 0;
-        crc2 = 0;
-        for (i = 0; i < Z_BATCH; i++) {
-            val0 = word[i];
-            val1 = word[i + Z_BATCH];
-            val2 = word[i + 2 * Z_BATCH];
-            __asm__ volatile("crc32x %w0, %w0, %x1" : "+r"(crc) : "r"(val0));
-            __asm__ volatile("crc32x %w0, %w0, %x1" : "+r"(crc1) : "r"(val1));
-            __asm__ volatile("crc32x %w0, %w0, %x1" : "+r"(crc2) : "r"(val2));
-        }
-        word += 3 * Z_BATCH;
-        num -= 3 * Z_BATCH;
-        crc = multmodp(Z_BATCH_ZEROS, crc) ^ crc1;
-        crc = multmodp(Z_BATCH_ZEROS, crc) ^ crc2;
-    }
-
-    /* Do one last smaller batch with the remaining words, if there are enough
-       to pay for the combination of CRCs. */
-    last = num / 3;
-    if (last >= Z_BATCH_MIN) {
-        last2 = last << 1;
-        crc1 = 0;
-        crc2 = 0;
-        for (i = 0; i < last; i++) {
-            val0 = word[i];
-            val1 = word[i + last];
-            val2 = word[i + last2];
-            __asm__ volatile("crc32x %w0, %w0, %x1" : "+r"(crc) : "r"(val0));
-            __asm__ volatile("crc32x %w0, %w0, %x1" : "+r"(crc1) : "r"(val1));
-            __asm__ volatile("crc32x %w0, %w0, %x1" : "+r"(crc2) : "r"(val2));
-        }
-        word += 3 * last;
-        num -= 3 * last;
-        val = x2nmodp(last, 6);
-        crc = multmodp(val, crc) ^ crc1;
-        crc = multmodp(val, crc) ^ crc2;
-    }
-
-    /* Compute the CRC on any remaining words. */
-    for (i = 0; i < num; i++) {
-        val0 = word[i];
-        __asm__ volatile("crc32x %w0, %w0, %x1" : "+r"(crc) : "r"(val0));
-    }
-    word += num;
-
-    /* Complete the CRC on any remaining bytes. */
-    buf = (const unsigned char FAR *)word;
-    while (len) {
-        len--;
-        val = *buf++;
-        __asm__ volatile("crc32b %w0, %w0, %w1" : "+r"(crc) : "r"(val));
-    }
-
-    /* Return the CRC, post-conditioned. */
-    return crc ^ 0xffffffff;
-}
-
-#else
-
-#ifdef W
-
-/*
-  Return the CRC of the W bytes in the word_t data, taking the
-  least-significant byte of the word as the first byte of data, without any pre
-  or post conditioning. This is used to combine the CRCs of each braid.
- */
-local z_crc_t crc_word(data)
-    z_word_t data;
-{
-    int k;
-    for (k = 0; k < W; k++)
-        data = (data >> 8) ^ crc_table[data & 0xff];
-    return (z_crc_t)data;
-}
-
-local z_word_t crc_word_big(data)
-    z_word_t data;
-{
-    int k;
-    for (k = 0; k < W; k++)
-        data = (data << 8) ^
-            crc_big_table[(data >> ((W - 1) << 3)) & 0xff];
-    return data;
-}
-
-#endif
-
-/* ========================================================================= */
-unsigned long ZEXPORT crc32_z(crc, buf, len)
-    unsigned long crc;
-    const unsigned char FAR *buf;
-    z_size_t len;
-{
-    /* Return initial CRC, if requested. */
-    if (buf == Z_NULL) return 0;
-
-#ifdef DYNAMIC_CRC_TABLE
-    once(&made, make_crc_table);
-#endif /* DYNAMIC_CRC_TABLE */
-
-    /* Pre-condition the CRC */
-    crc = (~crc) & 0xffffffff;
-
-#ifdef W
-
-    /* If provided enough bytes, do a braided CRC calculation. */
-    if (len >= N * W + W - 1) {
-        z_size_t blks;
-        z_word_t const *words;
-        unsigned endian;
-        int k;
-
-        /* Compute the CRC up to a z_word_t boundary. */
-        while (len && ((z_size_t)buf & (W - 1)) != 0) {
-            len--;
-            crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
-        }
-
-        /* Compute the CRC on as many N z_word_t blocks as are available. */
-        blks = len / (N * W);
-        len -= blks * N * W;
-        words = (z_word_t const *)buf;
-
-        /* Do endian check at execution time instead of compile time, since ARM
-           processors can change the endianess at execution time. If the
-           compiler knows what the endianess will be, it can optimize out the
-           check and the unused branch. */
-        endian = 1;
-        if (*(unsigned char *)&endian) {
-            /* Little endian. */
-
-            z_crc_t crc0;
-            z_word_t word0;
-#if N > 1
-            z_crc_t crc1;
-            z_word_t word1;
-#if N > 2
-            z_crc_t crc2;
-            z_word_t word2;
-#if N > 3
-            z_crc_t crc3;
-            z_word_t word3;
-#if N > 4
-            z_crc_t crc4;
-            z_word_t word4;
-#if N > 5
-            z_crc_t crc5;
-            z_word_t word5;
-#endif
-#endif
-#endif
-#endif
-#endif
-
-            /* Initialize the CRC for each braid. */
-            crc0 = crc;
-#if N > 1
-            crc1 = 0;
-#if N > 2
-            crc2 = 0;
-#if N > 3
-            crc3 = 0;
-#if N > 4
-            crc4 = 0;
-#if N > 5
-            crc5 = 0;
-#endif
-#endif
-#endif
-#endif
-#endif
-
-            /*
-              Process the first blks-1 blocks, computing the CRCs on each braid
-              independently.
-             */
-            while (--blks) {
-                /* Load the word for each braid into registers. */
-                word0 = crc0 ^ words[0];
-#if N > 1
-                word1 = crc1 ^ words[1];
-#if N > 2
-                word2 = crc2 ^ words[2];
-#if N > 3
-                word3 = crc3 ^ words[3];
-#if N > 4
-                word4 = crc4 ^ words[4];
-#if N > 5
-                word5 = crc5 ^ words[5];
-#endif
-#endif
-#endif
-#endif
-#endif
-                words += N;
-
-                /* Compute and update the CRC for each word. The loop should
-                   get unrolled. */
-                crc0 = crc_braid_table[0][word0 & 0xff];
-#if N > 1
-                crc1 = crc_braid_table[0][word1 & 0xff];
-#if N > 2
-                crc2 = crc_braid_table[0][word2 & 0xff];
-#if N > 3
-                crc3 = crc_braid_table[0][word3 & 0xff];
-#if N > 4
-                crc4 = crc_braid_table[0][word4 & 0xff];
-#if N > 5
-                crc5 = crc_braid_table[0][word5 & 0xff];
-#endif
-#endif
-#endif
-#endif
-#endif
-                for (k = 1; k < W; k++) {
-                    crc0 ^= crc_braid_table[k][(word0 >> (k << 3)) & 0xff];
-#if N > 1
-                    crc1 ^= crc_braid_table[k][(word1 >> (k << 3)) & 0xff];
-#if N > 2
-                    crc2 ^= crc_braid_table[k][(word2 >> (k << 3)) & 0xff];
-#if N > 3
-                    crc3 ^= crc_braid_table[k][(word3 >> (k << 3)) & 0xff];
-#if N > 4
-                    crc4 ^= crc_braid_table[k][(word4 >> (k << 3)) & 0xff];
-#if N > 5
-                    crc5 ^= crc_braid_table[k][(word5 >> (k << 3)) & 0xff];
-#endif
-#endif
-#endif
-#endif
-#endif
-                }
-            }
-
-            /*
-              Process the last block, combining the CRCs of the N braids at the
-              same time.
-             */
-            crc = crc_word(crc0 ^ words[0]);
-#if N > 1
-            crc = crc_word(crc1 ^ words[1] ^ crc);
-#if N > 2
-            crc = crc_word(crc2 ^ words[2] ^ crc);
-#if N > 3
-            crc = crc_word(crc3 ^ words[3] ^ crc);
-#if N > 4
-            crc = crc_word(crc4 ^ words[4] ^ crc);
-#if N > 5
-            crc = crc_word(crc5 ^ words[5] ^ crc);
-#endif
-#endif
-#endif
-#endif
-#endif
-            words += N;
-        }
-        else {
-            /* Big endian. */
-
-            z_word_t crc0, word0, comb;
-#if N > 1
-            z_word_t crc1, word1;
-#if N > 2
-            z_word_t crc2, word2;
-#if N > 3
-            z_word_t crc3, word3;
-#if N > 4
-            z_word_t crc4, word4;
-#if N > 5
-            z_word_t crc5, word5;
-#endif
-#endif
-#endif
-#endif
-#endif
-
-            /* Initialize the CRC for each braid. */
-            crc0 = byte_swap(crc);
-#if N > 1
-            crc1 = 0;
-#if N > 2
-            crc2 = 0;
-#if N > 3
-            crc3 = 0;
-#if N > 4
-            crc4 = 0;
-#if N > 5
-            crc5 = 0;
-#endif
-#endif
-#endif
-#endif
-#endif
-
-            /*
-              Process the first blks-1 blocks, computing the CRCs on each braid
-              independently.
-             */
-            while (--blks) {
-                /* Load the word for each braid into registers. */
-                word0 = crc0 ^ words[0];
-#if N > 1
-                word1 = crc1 ^ words[1];
-#if N > 2
-                word2 = crc2 ^ words[2];
-#if N > 3
-                word3 = crc3 ^ words[3];
-#if N > 4
-                word4 = crc4 ^ words[4];
-#if N > 5
-                word5 = crc5 ^ words[5];
-#endif
-#endif
-#endif
-#endif
-#endif
-                words += N;
-
-                /* Compute and update the CRC for each word. The loop should
-                   get unrolled. */
-                crc0 = crc_braid_big_table[0][word0 & 0xff];
-#if N > 1
-                crc1 = crc_braid_big_table[0][word1 & 0xff];
-#if N > 2
-                crc2 = crc_braid_big_table[0][word2 & 0xff];
-#if N > 3
-                crc3 = crc_braid_big_table[0][word3 & 0xff];
-#if N > 4
-                crc4 = crc_braid_big_table[0][word4 & 0xff];
-#if N > 5
-                crc5 = crc_braid_big_table[0][word5 & 0xff];
-#endif
-#endif
-#endif
-#endif
-#endif
-                for (k = 1; k < W; k++) {
-                    crc0 ^= crc_braid_big_table[k][(word0 >> (k << 3)) & 0xff];
-#if N > 1
-                    crc1 ^= crc_braid_big_table[k][(word1 >> (k << 3)) & 0xff];
-#if N > 2
-                    crc2 ^= crc_braid_big_table[k][(word2 >> (k << 3)) & 0xff];
-#if N > 3
-                    crc3 ^= crc_braid_big_table[k][(word3 >> (k << 3)) & 0xff];
-#if N > 4
-                    crc4 ^= crc_braid_big_table[k][(word4 >> (k << 3)) & 0xff];
-#if N > 5
-                    crc5 ^= crc_braid_big_table[k][(word5 >> (k << 3)) & 0xff];
-#endif
-#endif
-#endif
-#endif
-#endif
-                }
-            }
-
-            /*
-              Process the last block, combining the CRCs of the N braids at the
-              same time.
-             */
-            comb = crc_word_big(crc0 ^ words[0]);
-#if N > 1
-            comb = crc_word_big(crc1 ^ words[1] ^ comb);
-#if N > 2
-            comb = crc_word_big(crc2 ^ words[2] ^ comb);
-#if N > 3
-            comb = crc_word_big(crc3 ^ words[3] ^ comb);
-#if N > 4
-            comb = crc_word_big(crc4 ^ words[4] ^ comb);
-#if N > 5
-            comb = crc_word_big(crc5 ^ words[5] ^ comb);
-#endif
-#endif
-#endif
-#endif
-#endif
-            words += N;
-            crc = byte_swap(comb);
-        }
-
-        /*
-          Update the pointer to the remaining bytes to process.
-         */
-        buf = (unsigned char const *)words;
-    }
-
-#endif /* W */
-
-    /* Complete the computation of the CRC on any remaining bytes. */
-    while (len >= 8) {
-        len -= 8;
-        crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
-        crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
-        crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
-        crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
-        crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
-        crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
-        crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
-        crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
-    }
-    while (len) {
-        len--;
-        crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
-    }
-
-    /* Return the CRC, post-conditioned. */
-    return crc ^ 0xffffffff;
-}
-
-#endif
-
-/* ========================================================================= */
-unsigned long ZEXPORT crc32(crc, buf, len)
-    unsigned long crc;
-    const unsigned char FAR *buf;
-    uInt len;
-{
-    return crc32_z(crc, buf, len);
-}
-
-/* ========================================================================= */
-uLong ZEXPORT crc32_combine64(crc1, crc2, len2)
-    uLong crc1;
-    uLong crc2;
-    z_off64_t len2;
-{
-#ifdef DYNAMIC_CRC_TABLE
-    once(&made, make_crc_table);
-#endif /* DYNAMIC_CRC_TABLE */
-    return multmodp(x2nmodp(len2, 3), crc1) ^ (crc2 & 0xffffffff);
-}
-
-/* ========================================================================= */
-uLong ZEXPORT crc32_combine(crc1, crc2, len2)
-    uLong crc1;
-    uLong crc2;
-    z_off_t len2;
-{
-    return crc32_combine64(crc1, crc2, (z_off64_t)len2);
-}
-
-/* ========================================================================= */
-uLong ZEXPORT crc32_combine_gen64(len2)
-    z_off64_t len2;
-{
-#ifdef DYNAMIC_CRC_TABLE
-    once(&made, make_crc_table);
-#endif /* DYNAMIC_CRC_TABLE */
-    return x2nmodp(len2, 3);
-}
-
-/* ========================================================================= */
-uLong ZEXPORT crc32_combine_gen(len2)
-    z_off_t len2;
-{
-    return crc32_combine_gen64((z_off64_t)len2);
-}
-
-/* ========================================================================= */
-uLong ZEXPORT crc32_combine_op(crc1, crc2, op)
-    uLong crc1;
-    uLong crc2;
-    uLong op;
-{
-    return multmodp(op, crc1) ^ (crc2 & 0xffffffff);
-}