lzop: code shrink by using header_t matching on-disk layout
function old new delta add_bytes_to_chksum 37 47 +10 lzo_decompress 524 532 +8 init_chksum 14 21 +7 chksum_getresult 13 17 +4 f_read 33 28 -5 f_write8 20 - -20 f_write32 22 - -22 f_write16 25 - -25 f_write 36 - -36 do_lzo_compress 328 232 -96 do_lzo_decompress 526 411 -115 ------------------------------------------------------------------------------ (add/remove: 0/4 grow/shrink: 4/3 up/down: 29/-319) Total: -290 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
7924b69f99
commit
434f95960a
331
archival/lzop.c
331
archival/lzop.c
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@ -438,36 +438,33 @@ typedef struct chksum_t {
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} chksum_t;
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typedef struct header_t {
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unsigned version;
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unsigned lib_version;
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unsigned version_needed_to_extract;
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uint32_t flags;
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uint32_t mode;
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uint32_t mtime;
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uint32_t gmtdiff;
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uint32_t header_checksum;
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/* used to have auxiliary fields here */
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uint32_t extra_field_len;
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uint32_t extra_field_checksum;
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unsigned char method;
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unsigned char level;
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/* info */
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char name[255+1];
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/* Starting from here, the layout and endianness
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* are exactly in on-disk format.
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*/
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uint16_t version_be16;
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uint16_t lib_version_be16;
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uint16_t version_needed_to_extract_be16;
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uint8_t method;
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uint8_t level;
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uint32_t flags32; /* be32 on disk, but we keep them in native order */
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uint32_t mode_be32;
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uint32_t mtime_be32;
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uint32_t gmtdiff_be32;
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char len_and_name[1+255+1];
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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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chksum_t chksum_in;
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chksum_t chksum_out;
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chksum_t chksum;
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} FIX_ALIASING;
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#define G (*(struct globals*)bb_common_bufsiz1)
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#define INIT_G() do { setup_common_bufsiz(); } while (0)
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//#define G (*ptr_to_globals)
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//#define INIT_G() do {
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// SET_PTR_TO_GLOBALS(xzalloc(sizeof(G)));
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//} while (0)
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#define INIT_G() do { \
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setup_common_bufsiz(); \
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/*SET_PTR_TO_GLOBALS(xzalloc(sizeof(G)));*/ \
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} while (0)
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/**********************************************************************/
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@ -548,24 +545,24 @@ lzo_crc32(uint32_t c, const uint8_t* buf, unsigned len)
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}
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/**********************************************************************/
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static void init_chksum(chksum_t *ct)
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static void init_chksum(void)
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{
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ct->f_adler32 = ADLER32_INIT_VALUE;
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ct->f_crc32 = CRC32_INIT_VALUE;
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G.chksum.f_adler32 = ADLER32_INIT_VALUE;
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G.chksum.f_crc32 = CRC32_INIT_VALUE;
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}
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static void add_bytes_to_chksum(chksum_t *ct, const void* buf, int cnt)
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static void add_bytes_to_chksum(const void* buf, int cnt)
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{
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/* We need to handle the two checksums at once, because at the
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* beginning of the header, we don't know yet which one we'll
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* eventually need */
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ct->f_adler32 = lzo_adler32(ct->f_adler32, (const uint8_t*)buf, cnt);
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ct->f_crc32 = lzo_crc32(ct->f_crc32, (const uint8_t*)buf, cnt);
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G.chksum.f_adler32 = lzo_adler32(G.chksum.f_adler32, (const uint8_t*)buf, cnt);
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G.chksum.f_crc32 = lzo_crc32(G.chksum.f_crc32, (const uint8_t*)buf, cnt);
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}
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static uint32_t chksum_getresult(chksum_t *ct, const header_t *h)
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static uint32_t chksum_getresult(uint32_t h_flags32)
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{
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return (h->flags & F_H_CRC32) ? ct->f_crc32 : ct->f_adler32;
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return (h_flags32 & F_H_CRC32) ? G.chksum.f_crc32 : G.chksum.f_adler32;
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}
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/**********************************************************************/
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@ -575,50 +572,23 @@ static uint32_t read32(void)
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xread(0, &v, 4);
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return ntohl(v);
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}
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static void write32(uint32_t v)
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{
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v = htonl(v);
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xwrite(1, &v, 4);
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}
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static void f_write(const void* buf, int cnt)
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{
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xwrite(1, buf, cnt);
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add_bytes_to_chksum(&G.chksum_out, buf, cnt);
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}
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static void f_read(void* buf, int cnt)
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{
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xread(0, buf, cnt);
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add_bytes_to_chksum(&G.chksum_in, buf, cnt);
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add_bytes_to_chksum(buf, cnt);
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}
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static int f_read8(void)
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{
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uint8_t v;
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f_read(&v, 1);
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return v;
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}
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static void f_write8(uint8_t v)
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{
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f_write(&v, 1);
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}
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static unsigned f_read16(void)
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{
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uint16_t v;
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f_read(&v, 2);
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return ntohs(v);
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}
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static void f_write16(uint16_t v)
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{
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v = htons(v);
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f_write(&v, 2);
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}
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static uint32_t f_read32(void)
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{
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uint32_t v;
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@ -626,34 +596,30 @@ static uint32_t f_read32(void)
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return ntohl(v);
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}
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static void f_write32(uint32_t v)
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static void write32(uint32_t v)
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{
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v = htonl(v);
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f_write(&v, 4);
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xwrite(1, &v, 4);
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}
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/**********************************************************************/
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static int lzo_get_method(header_t *h)
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static void f_write(const void* buf, int cnt)
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{
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/* check method */
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if (h->method == M_LZO1X_1) {
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if (h->level == 0)
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h->level = 3;
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} else if (h->method == M_LZO1X_1_15) {
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if (h->level == 0)
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h->level = 1;
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} else if (h->method == M_LZO1X_999) {
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if (h->level == 0)
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h->level = 9;
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} else
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return -1; /* not a LZO method */
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/* check compression level */
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if (h->level < 1 || h->level > 9)
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return 15;
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return 0;
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xwrite(1, buf, cnt);
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add_bytes_to_chksum(buf, cnt);
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}
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//static void f_write8(uint8_t v)
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//{
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// f_write(&v, 1);
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//}
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//static void f_write16(uint16_t v)
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//{
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// v = htons(v);
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// f_write(&v, 2);
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//}
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//static void f_write32(uint32_t v)
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//{
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// v = htonl(v);
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// f_write(&v, 4);
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//}
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/**********************************************************************/
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#define LZO_BLOCK_SIZE (256 * 1024l)
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@ -697,9 +663,9 @@ static NOINLINE int lzo_compress(const header_t *h)
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break;
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/* compute checksum of uncompressed block */
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if (h->flags & F_ADLER32_D)
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if (h->flags32 & F_ADLER32_D)
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d_adler32 = lzo_adler32(ADLER32_INIT_VALUE, b1, src_len);
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if (h->flags & F_CRC32_D)
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if (h->flags32 & F_CRC32_D)
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d_crc32 = lzo_crc32(CRC32_INIT_VALUE, b1, src_len);
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/* compress */
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@ -734,16 +700,16 @@ static NOINLINE int lzo_compress(const header_t *h)
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}
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/* write checksum of uncompressed block */
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if (h->flags & F_ADLER32_D)
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if (h->flags32 & F_ADLER32_D)
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write32(d_adler32);
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if (h->flags & F_CRC32_D)
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if (h->flags32 & F_CRC32_D)
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write32(d_crc32);
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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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if (h->flags32 & F_ADLER32_C)
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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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if (h->flags32 & 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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xwrite(1, b2, dst_len);
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@ -777,7 +743,9 @@ static FAST_FUNC void lzo_check(
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/**********************************************************************/
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// decompress a file
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/**********************************************************************/
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static NOINLINE int lzo_decompress(const header_t *h)
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// used to have "const header_t *h" parameter, but since it uses
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// only flags32 field, changed to receive only that.
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static NOINLINE int lzo_decompress(uint32_t h_flags32)
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{
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unsigned block_size = LZO_BLOCK_SIZE;
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int r;
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@ -822,16 +790,16 @@ static NOINLINE int lzo_decompress(const header_t *h)
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}
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/* read checksum of uncompressed block */
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if (h->flags & F_ADLER32_D)
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if (h_flags32 & F_ADLER32_D)
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d_adler32 = read32();
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if (h->flags & F_CRC32_D)
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if (h_flags32 & F_CRC32_D)
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d_crc32 = read32();
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/* read checksum of compressed block */
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if (src_len < dst_len) {
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if (h->flags & F_ADLER32_C)
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if (h_flags32 & F_ADLER32_C)
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c_adler32 = read32();
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if (h->flags & F_CRC32_C)
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if (h_flags32 & F_CRC32_C)
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c_crc32 = read32();
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}
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@ -846,11 +814,11 @@ static NOINLINE int lzo_decompress(const header_t *h)
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if (!(option_mask32 & OPT_F)) {
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/* verify checksum of compressed block */
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if (h->flags & F_ADLER32_C)
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if (h_flags32 & F_ADLER32_C)
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lzo_check(ADLER32_INIT_VALUE,
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b1, src_len,
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lzo_adler32, c_adler32);
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if (h->flags & F_CRC32_C)
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if (h_flags32 & F_CRC32_C)
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lzo_check(CRC32_INIT_VALUE,
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b1, src_len,
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lzo_crc32, c_crc32);
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@ -873,11 +841,11 @@ static NOINLINE int lzo_decompress(const header_t *h)
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if (!(option_mask32 & OPT_F)) {
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/* verify checksum of uncompressed block */
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if (h->flags & F_ADLER32_D)
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if (h_flags32 & F_ADLER32_D)
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lzo_check(ADLER32_INIT_VALUE,
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dst, dst_len,
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lzo_adler32, d_adler32);
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if (h->flags & F_CRC32_D)
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if (h_flags32 & F_CRC32_D)
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lzo_check(CRC32_INIT_VALUE,
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dst, dst_len,
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lzo_crc32, d_crc32);
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@ -917,7 +885,7 @@ static NOINLINE int lzo_decompress(const header_t *h)
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* -00000020 00 00 2d 67 04 17 00 04 00 00 00 03 ed ec 9d 6d
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* +00000020 00 00 10 5f 00 c1 00 04 00 00 00 03 ed ec 9d 6d
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* ^^^^^^^^^^^
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* chksum_out
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* chksum
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* The rest is identical.
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*/
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static const unsigned char lzop_magic[9] ALIGN1 = {
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@ -936,114 +904,115 @@ static void check_magic(void)
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/**********************************************************************/
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// lzop file header
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/**********************************************************************/
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static void write_header(const header_t *h)
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static void write_header(header_t *h)
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{
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int l;
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char *end;
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xwrite(1, lzop_magic, sizeof(lzop_magic));
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init_chksum(&G.chksum_out);
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init_chksum();
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f_write16(h->version);
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f_write16(h->lib_version);
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f_write16(h->version_needed_to_extract);
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f_write8(h->method);
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f_write8(h->level);
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f_write32(h->flags);
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f_write32(h->mode);
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f_write32(h->mtime);
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f_write32(h->gmtdiff);
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/* Our caller leaves name zero-filled, so len == 0 */
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end = h->len_and_name+1 + 0; /* 0 is strlen(h->len_and_name+1) */
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/* Store length byte */
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/*h->len_and_name[0] = end - (h->len_and_name+1); - zero already */
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l = (int) strlen(h->name);
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f_write8(l);
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if (l)
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f_write(h->name, l);
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f_write(&h->version_be16, end - (char*)&h->version_be16);
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f_write32(chksum_getresult(&G.chksum_out, h));
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h->flags32 = htonl(h->flags32); /* native endianness for lzo_compress() */
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/*f_*/write32(chksum_getresult(h->flags32));
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}
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static int read_header(header_t *h)
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{
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int r;
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int l;
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uint32_t checksum;
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unsigned h_version;
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uint8_t h_method, h_level;
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memset(h, 0, sizeof(*h));
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h->version_needed_to_extract = 0x0900; /* first lzop version */
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h->level = 0;
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init_chksum();
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init_chksum(&G.chksum_in);
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h->version = f_read16();
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if (h->version < 0x0900)
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/* As it stands now, only h->flags32 is used by our caller.
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* Therefore we don't store many fields in h->field.
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*/
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h_version = f_read16();
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if (h_version < 0x0900)
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return 3;
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h->lib_version = f_read16();
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if (h->version >= 0x0940) {
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h->version_needed_to_extract = f_read16();
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if (h->version_needed_to_extract > LZOP_VERSION)
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/* UNUSED h->lib_version_be16 = */ f_read16();
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if (h_version >= 0x0940) {
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unsigned h_version_needed_to_extract = f_read16();
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if (h_version_needed_to_extract > LZOP_VERSION)
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return 16;
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if (h->version_needed_to_extract < 0x0900)
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if (h_version_needed_to_extract < 0x0900) /* first lzop version */
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return 3;
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}
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h->method = f_read8();
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if (h->version >= 0x0940)
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h->level = f_read8();
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h->flags = f_read32();
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if (h->flags & F_H_FILTER)
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return 16; /* filter not supported */
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h->mode = f_read32();
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h->mtime = f_read32();
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if (h->version >= 0x0940)
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h->gmtdiff = f_read32();
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l = f_read8();
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if (l > 0)
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f_read(h->name, l);
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h->name[l] = 0;
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checksum = chksum_getresult(&G.chksum_in, h);
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h->header_checksum = f_read32();
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if (h->header_checksum != checksum)
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return 2;
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if (h->method <= 0)
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h_method = f_read8();
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if (h_method <= 0)
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return 14;
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r = lzo_get_method(h);
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if (r != 0)
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return r;
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h_level = 0;
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if (h_version >= 0x0940)
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h_level = f_read8();
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/* former lzo_get_method(h): */
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if (h_method == M_LZO1X_1) {
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if (h_level == 0)
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h_level = 3;
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} else if (h_method == M_LZO1X_1_15) {
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if (h_level == 0)
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h_level = 1;
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} else if (h_method == M_LZO1X_999) {
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if (h_level == 0)
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h_level = 9;
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} else
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return -1; /* not a LZO method */
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/* check compression level */
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if (h_level < 1 || h_level > 9)
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return 15;
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h->flags32 = f_read32();
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if (h->flags32 & F_H_FILTER)
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return 16; /* filter not supported */
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/* check reserved flags */
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if (h->flags & F_RESERVED)
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if (h->flags32 & F_RESERVED)
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return -13;
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/* UNUSED h->mode = */ f_read32();
|
||||
/* UNUSED h->mtime = */ f_read32();
|
||||
if (h_version >= 0x0940)
|
||||
/* UNUSED h->gmtdiff = */ f_read32();
|
||||
|
||||
l = f_read8();
|
||||
/* UNUSED h->len_and_name[0] = l; */
|
||||
/* UNUSED h->len_and_name[1+l] = 0; */
|
||||
if (l > 0)
|
||||
f_read(h->len_and_name+1, l);
|
||||
|
||||
checksum = chksum_getresult(h->flags32);
|
||||
if (f_read32() != checksum)
|
||||
return 2;
|
||||
|
||||
/* skip extra field [not used yet] */
|
||||
if (h->flags & F_H_EXTRA_FIELD) {
|
||||
if (h->flags32 & F_H_EXTRA_FIELD) {
|
||||
uint32_t extra_field_len;
|
||||
uint32_t extra_field_checksum;
|
||||
uint32_t k;
|
||||
|
||||
/* note: the checksum also covers the length */
|
||||
init_chksum(&G.chksum_in);
|
||||
h->extra_field_len = f_read32();
|
||||
for (k = 0; k < h->extra_field_len; k++)
|
||||
init_chksum();
|
||||
extra_field_len = f_read32();
|
||||
for (k = 0; k < extra_field_len; k++)
|
||||
f_read8();
|
||||
checksum = chksum_getresult(&G.chksum_in, h);
|
||||
h->extra_field_checksum = f_read32();
|
||||
if (h->extra_field_checksum != checksum)
|
||||
checksum = chksum_getresult(h->flags32);
|
||||
extra_field_checksum = f_read32();
|
||||
if (extra_field_checksum != checksum)
|
||||
return 3;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void p_header(header_t *h)
|
||||
{
|
||||
int r;
|
||||
|
||||
r = read_header(h);
|
||||
if (r == 0)
|
||||
return;
|
||||
bb_error_msg_and_die("header_error %d", r);
|
||||
}
|
||||
|
||||
/**********************************************************************/
|
||||
// compress
|
||||
/**********************************************************************/
|
||||
|
|
@ -1082,18 +1051,21 @@ static int do_lzo_compress(void)
|
|||
|
||||
lzo_set_method(h);
|
||||
|
||||
h->version = (LZOP_VERSION & 0xffff);
|
||||
h->version_needed_to_extract = 0x0940;
|
||||
h->lib_version = lzo_version() & 0xffff;
|
||||
h->version_be16 = htons(LZOP_VERSION & 0xffff);
|
||||
h->version_needed_to_extract_be16 = htons(0x0940);
|
||||
h->lib_version_be16 = htons(lzo_version() & 0xffff);
|
||||
|
||||
h->flags = (F_OS & F_OS_MASK) | (F_CS & F_CS_MASK);
|
||||
h->flags32 = htonl((F_OS & F_OS_MASK) | (F_CS & F_CS_MASK));
|
||||
|
||||
if (!(option_mask32 & OPT_F) || h->method == M_LZO1X_999) {
|
||||
h->flags |= F_ADLER32_D;
|
||||
h->flags32 |= htonl(F_ADLER32_D);
|
||||
if (option_mask32 & OPT_C)
|
||||
h->flags |= F_ADLER32_C;
|
||||
h->flags32 |= htonl(F_ADLER32_C);
|
||||
}
|
||||
|
||||
/* write_header() also converts h->flags32 to native endianness */
|
||||
write_header(h);
|
||||
|
||||
return lzo_compress(h);
|
||||
#undef h
|
||||
}
|
||||
|
|
@ -1103,11 +1075,14 @@ static int do_lzo_compress(void)
|
|||
/**********************************************************************/
|
||||
static int do_lzo_decompress(void)
|
||||
{
|
||||
int r;
|
||||
header_t header;
|
||||
|
||||
check_magic();
|
||||
p_header(&header);
|
||||
return lzo_decompress(&header);
|
||||
r = read_header(&header);
|
||||
if (r != 0)
|
||||
bb_error_msg_and_die("header_error %d", r);
|
||||
return lzo_decompress(header.flags32);
|
||||
}
|
||||
|
||||
static char* FAST_FUNC make_new_name_lzop(char *filename, const char *expected_ext UNUSED_PARAM)
|
||||
|
|
@ -1132,6 +1107,8 @@ static IF_DESKTOP(long long) int FAST_FUNC pack_lzop(transformer_state_t *xstate
|
|||
int lzop_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
||||
int lzop_main(int argc UNUSED_PARAM, char **argv)
|
||||
{
|
||||
INIT_G();
|
||||
|
||||
getopt32(argv, OPTION_STRING);
|
||||
argv += optind;
|
||||
/* -U is "anti -k", invert bit for bbunpack(): */
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user