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libbb: introduce and use common crc32 routine
function old new delta crc32_block_endian1 - 37 +37 crc32_block_endian0 - 34 +34 global_crc32_table - 8 +8 file_read 82 87 +5 gzip_main 211 214 +3 xz_crc32 40 35 -5 crc32_table 8 - -8 calculate_gunzip_crc 54 34 -20 lzo_crc32 54 25 -29 cksum_main 298 211 -87 ------------------------------------------------------------------------------ (add/remove: 3/1 grow/shrink: 2/4 up/down: 87/-149) Total: -62 bytes Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
This commit is contained in:
Denys Vlasenko
parent
dd88ba88f5
commit
9ce642f974
@ -340,7 +340,7 @@ struct globals {
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ulg bits_sent; /* bit length of the compressed data */
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#endif
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uint32_t *crc_32_tab;
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/*uint32_t *crc_32_tab;*/
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uint32_t crc; /* shift register contents */
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};
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@ -393,15 +393,9 @@ static void put_32bit(ulg n)
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* pointer, then initialize the crc shift register contents instead.
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* Return the current crc in either case.
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*/
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static uint32_t updcrc(uch * s, unsigned n)
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static void updcrc(uch * s, unsigned n)
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{
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uint32_t c = G1.crc;
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while (n) {
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c = G1.crc_32_tab[(uch)(c ^ *s++)] ^ (c >> 8);
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n--;
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}
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G1.crc = c;
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return c;
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G1.crc = crc32_block_endian0(G1.crc, s, n, global_crc32_table /*G1.crc_32_tab*/);
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}
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@ -2104,8 +2098,8 @@ int gzip_main(int argc UNUSED_PARAM, char **argv)
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ALLOC(uch, G1.window, 2L * WSIZE);
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ALLOC(ush, G1.prev, 1L << BITS);
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/* Initialise the CRC32 table */
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G1.crc_32_tab = crc32_filltable(NULL, 0);
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/* Initialize the CRC32 table */
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global_crc32_table = crc32_filltable(NULL, 0);
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return bbunpack(argv, pack_gzip, append_ext, "gz");
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}
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@ -22,17 +22,9 @@
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/* We use our own crc32 function */
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#define XZ_INTERNAL_CRC32 0
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static uint32_t *crc32_table;
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static uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc)
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{
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crc = ~crc;
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while (size != 0) {
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crc = crc32_table[*buf++ ^ (crc & 0xFF)] ^ (crc >> 8);
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--size;
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}
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return ~crc;
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return ~crc32_block_endian0(~crc, buf, size, global_crc32_table);
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}
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/* We use arch-optimized unaligned accessors */
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@ -53,8 +45,8 @@ unpack_xz_stream(int src_fd, int dst_fd)
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unsigned char *membuf;
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IF_DESKTOP(long long) int total = 0;
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if (!crc32_table)
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crc32_table = crc32_filltable(NULL, /*endian:*/ 0);
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if (!global_crc32_table)
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global_crc32_table = crc32_filltable(NULL, /*endian:*/ 0);
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memset(&iobuf, 0, sizeof(iobuf));
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/* Preload XZ file signature */
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@ -925,10 +925,7 @@ static int inflate_block(STATE_PARAM smallint *e)
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/* Two callsites, both in inflate_get_next_window */
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static void calculate_gunzip_crc(STATE_PARAM_ONLY)
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{
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unsigned n;
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for (n = 0; n < gunzip_outbuf_count; n++) {
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gunzip_crc = gunzip_crc_table[((int) gunzip_crc ^ (gunzip_window[n])) & 0xff] ^ (gunzip_crc >> 8);
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}
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gunzip_crc = crc32_block_endian0(gunzip_crc, gunzip_window, gunzip_outbuf_count, gunzip_crc_table);
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gunzip_bytes_out += gunzip_outbuf_count;
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}
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@ -393,7 +393,7 @@ typedef struct header_t {
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} header_t;
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struct globals {
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const uint32_t *lzo_crc32_table;
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/*const uint32_t *lzo_crc32_table;*/
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chksum_t chksum_in;
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chksum_t chksum_out;
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} FIX_ALIASING;
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@ -468,19 +468,10 @@ lzo_adler32(uint32_t adler, const uint8_t* buf, unsigned len)
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static FAST_FUNC uint32_t
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lzo_crc32(uint32_t c, const uint8_t* buf, unsigned len)
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{
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uint32_t crc;
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//if (buf == NULL) - impossible
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// return 0;
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if (buf == NULL)
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return 0;
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crc = ~c;
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if (len != 0) do {
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crc = G.lzo_crc32_table[(uint8_t)((int)crc ^ *buf)] ^ (crc >> 8);
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buf += 1;
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len -= 1;
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} while (len > 0);
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return ~crc;
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return ~crc32_block_endian0(~c, buf, len, global_crc32_table);
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}
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/**********************************************************************/
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@ -679,8 +670,7 @@ static NOINLINE smallint lzo_compress(const header_t *h)
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if (dst_len < src_len) {
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/* write checksum of compressed block */
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if (h->flags & F_ADLER32_C)
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write32(lzo_adler32(ADLER32_INIT_VALUE, b2,
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dst_len));
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write32(lzo_adler32(ADLER32_INIT_VALUE, b2, dst_len));
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if (h->flags & F_CRC32_C)
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write32(lzo_crc32(CRC32_INIT_VALUE, b2, dst_len));
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/* write compressed block data */
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@ -1080,6 +1070,6 @@ int lzop_main(int argc UNUSED_PARAM, char **argv)
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if (applet_name[0] == 'u')
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option_mask32 |= OPT_DECOMPRESS;
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G.lzo_crc32_table = crc32_filltable(NULL, 0);
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global_crc32_table = crc32_filltable(NULL, 0);
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return bbunpack(argv, pack_lzop, make_new_name_lzop, /*unused:*/ NULL);
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}
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@ -18,7 +18,6 @@ int cksum_main(int argc UNUSED_PARAM, char **argv)
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off_t length, filesize;
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int bytes_read;
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int exit_code = EXIT_SUCCESS;
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uint8_t *cp;
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#if ENABLE_DESKTOP
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getopt32(argv, ""); /* coreutils 6.9 compat */
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@ -39,11 +38,7 @@ int cksum_main(int argc UNUSED_PARAM, char **argv)
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#define read_buf bb_common_bufsiz1
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while ((bytes_read = safe_read(fd, read_buf, sizeof(read_buf))) > 0) {
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cp = (uint8_t *) read_buf;
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length += bytes_read;
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do {
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crc = (crc << 8) ^ crc32_table[(crc >> 24) ^ *cp++];
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} while (--bytes_read);
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crc = crc32_block_endian1(crc, read_buf, bytes_read, crc32_table);
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}
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close(fd);
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@ -1543,11 +1543,10 @@ void sha512_begin(sha512_ctx_t *ctx) FAST_FUNC;
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void sha512_hash(sha512_ctx_t *ctx, const void *buffer, size_t len) FAST_FUNC;
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void sha512_end(sha512_ctx_t *ctx, void *resbuf) FAST_FUNC;
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/* TODO: add global crc32_table pointer and create
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* LE and BE functions to calculate crc32 over given bytes.
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* Currently we have about five reimplementations...
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*/
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extern uint32_t *global_crc32_table;
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uint32_t *crc32_filltable(uint32_t *tbl256, int endian) FAST_FUNC;
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uint32_t crc32_block_endian1(uint32_t val, const void *buf, unsigned len, uint32_t *crc_table) FAST_FUNC;
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uint32_t crc32_block_endian0(uint32_t val, const void *buf, unsigned len, uint32_t *crc_table) FAST_FUNC;
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typedef struct masks_labels_t {
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const char *labels;
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@ -18,6 +18,8 @@
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#include "libbb.h"
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uint32_t *global_crc32_table;
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uint32_t* FAST_FUNC crc32_filltable(uint32_t *crc_table, int endian)
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{
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uint32_t polynomial = endian ? 0x04c11db7 : 0xedb88320;
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@ -40,3 +42,25 @@ uint32_t* FAST_FUNC crc32_filltable(uint32_t *crc_table, int endian)
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return crc_table - 256;
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}
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uint32_t FAST_FUNC crc32_block_endian1(uint32_t val, const void *buf, unsigned len, uint32_t *crc_table)
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{
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const void *end = (uint8_t*)buf + len;
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while (buf != end) {
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val = (val << 8) ^ crc_table[(val >> 24) ^ *(uint8_t*)buf];
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buf = (uint8_t*)buf + 1;
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}
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return val;
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}
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uint32_t FAST_FUNC crc32_block_endian0(uint32_t val, const void *buf, unsigned len, uint32_t *crc_table)
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{
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const void *end = (uint8_t*)buf + len;
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while (buf != end) {
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val = crc_table [(uint8_t)val ^ *(uint8_t*)buf] ^ (val >> 8);
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buf = (uint8_t*)buf + 1;
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}
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return val;
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}
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@ -42,15 +42,6 @@ but mtd/jffs2-user.h is gone now (at least 2.6.31.6 does not have it anymore)
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#define cpu_to_je16(v) ((jint16_t){(v)})
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#define cpu_to_je32(v) ((jint32_t){(v)})
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static uint32_t crc32(uint32_t val, const void *ss, int len,
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uint32_t *crc32_table)
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{
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const unsigned char *s = ss;
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while (--len >= 0)
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val = crc32_table[(val ^ *s++) & 0xff] ^ (val >> 8);
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return val;
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}
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static void show_progress(mtd_info_t *meminfo, erase_info_t *erase)
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{
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printf("\rErasing %u Kibyte @ %x - %2u%% complete.",
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@ -131,8 +122,9 @@ int flash_eraseall_main(int argc UNUSED_PARAM, char **argv)
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cleanmarker.totlen = cpu_to_je32(8);
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}
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cleanmarker.hdr_crc = cpu_to_je32(crc32(0, &cleanmarker, sizeof(struct jffs2_unknown_node) - 4,
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crc32_table));
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cleanmarker.hdr_crc = cpu_to_je32(
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crc32_block_endian0(0, &cleanmarker, sizeof(struct jffs2_unknown_node) - 4, crc32_table)
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);
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}
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/* Don't want to destroy progress indicator by bb_error_msg's */
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@ -46,8 +46,6 @@ static unsigned int n_parts;
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static unsigned int part_array_len;
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static unsigned int part_entry_len;
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static uint32_t *crc32_table;
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static inline gpt_partition *
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gpt_part(int i)
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{
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@ -61,12 +59,7 @@ gpt_part(int i)
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static uint32_t
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gpt_crc32(void *buf, int len)
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{
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uint32_t crc = 0xffffffff;
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for (; len > 0; len--, buf++) {
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crc = crc32_table[(crc ^ *((char *)buf)) & 0xff] ^ (crc >> 8);
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}
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return crc ^ 0xffffffff;
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return 0xffffffff ^ crc32_block_endian0(0xffffffff, buf, len, global_crc32_table);
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}
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static void
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@ -160,8 +153,8 @@ check_gpt_label(void)
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return 0;
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}
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if (!crc32_table) {
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crc32_table = crc32_filltable(NULL, 0);
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if (!global_crc32_table) {
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global_crc32_table = crc32_filltable(NULL, 0);
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}
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crc = SWAP_LE32(gpt_hdr->hdr_crc32);
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