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Revert "UPDATE: DEFLATE algorithm"

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This reverts commit d786af83fc.
This commit is contained in:
Ray 2022-05-18 16:23:52 +02:00
parent d786af83fc
commit 6259dc4121
2 changed files with 100 additions and 119 deletions
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36
src/external/sdefl.h vendored
View File

@ -38,10 +38,10 @@ this file implementation in *one* C or C++ file to prevent collisions.
| zlib 1.2.11 -1 | 72 MB/s | 307 MB/s | 42298774 | 42.30 | | zlib 1.2.11 -1 | 72 MB/s | 307 MB/s | 42298774 | 42.30 |
| zlib 1.2.11 -6 | 24 MB/s | 313 MB/s | 36548921 | 36.55 | | zlib 1.2.11 -6 | 24 MB/s | 313 MB/s | 36548921 | 36.55 |
| zlib 1.2.11 -9 | 20 MB/s | 314 MB/s | 36475792 | 36.48 | | zlib 1.2.11 -9 | 20 MB/s | 314 MB/s | 36475792 | 36.48 |
| sdefl 1.0 -0 | 127 MB/s | 355 MB/s | 40004116 | 39.88 | | sdefl 1.0 -0 | 127 MB/s | 371 MB/s | 40004116 | 39.88 |
| sdefl 1.0 -1 | 111 MB/s | 413 MB/s | 38940674 | 38.82 | | sdefl 1.0 -1 | 111 MB/s | 398 MB/s | 38940674 | 38.82 |
| sdefl 1.0 -5 | 45 MB/s | 436 MB/s | 36577183 | 36.46 | | sdefl 1.0 -5 | 45 MB/s | 420 MB/s | 36577183 | 36.46 |
| sdefl 1.0 -7 | 38 MB/s | 432 MB/s | 36523781 | 36.41 | | sdefl 1.0 -7 | 38 MB/s | 423 MB/s | 36523781 | 36.41 |
| libdeflate 1.3 -1 | 147 MB/s | 667 MB/s | 39597378 | 39.60 | | libdeflate 1.3 -1 | 147 MB/s | 667 MB/s | 39597378 | 39.60 |
| libdeflate 1.3 -6 | 69 MB/s | 689 MB/s | 36648318 | 36.65 | | libdeflate 1.3 -6 | 69 MB/s | 689 MB/s | 36648318 | 36.65 |
| libdeflate 1.3 -9 | 13 MB/s | 672 MB/s | 35197141 | 35.20 | | libdeflate 1.3 -9 | 13 MB/s | 672 MB/s | 35197141 | 35.20 |
@ -50,20 +50,20 @@ this file implementation in *one* C or C++ file to prevent collisions.
### Compression ### Compression
Results on the [Silesia compression corpus](http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia): Results on the [Silesia compression corpus](http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia):
| File | Original | `sdefl 0` | `sdefl 5` | `sdefl 7` | | File | Original | `sdefl 0` | `sdefl 5` | `sdefl 7` |
| --------| -----------| -------------| ---------- | ------------| | :------ | ---------: | -----------------: | ---------: | ----------: |
| dickens | 10.192.446 | 4,260,187 | 3,845,261 | 3,833,657 | | dickens | 10.192.446 | 4,260,187| 3,845,261| 3,833,657 |
| mozilla | 51.220.480 | 20,774,706 | 19,607,009 | 19,565,867 | | mozilla | 51.220.480 | 20,774,706 | 19,607,009 | 19,565,867 |
| mr | 9.970.564 | 3,860,531 | 3,673,460 | 3,665,627 | | mr | 9.970.564 | 3,860,531 | 3,673,460 | 3,665,627 |
| nci | 33.553.445 | 4,030,283 | 3,094,526 | 3,006,075 | | nci | 33.553.445 | 4,030,283 | 3,094,526 | 3,006,075 |
| ooffice | 6.152.192 | 3,320,063 | 3,186,373 | 3,183,815 | | ooffice | 6.152.192 | 3,320,063 | 3,186,373 | 3,183,815 |
| osdb | 10.085.684 | 3,919,646 | 3,649,510 | 3,649,477 | | osdb | 10.085.684 | 3,919,646 | 3,649,510 | 3,649,477 |
| reymont | 6.627.202 | 2,263,378 | 1,857,588 | 1,827,237 | | reymont | 6.627.202 | 2,263,378 | 1,857,588 | 1,827,237 |
| samba | 21.606.400 | 6,121,797 | 5,462,670 | 5,450,762 | | samba | 21.606.400 | 6,121,797 | 5,462,670 | 5,450,762 |
| sao | 7.251.944 | 5,612,421 | 5,485,380 | 5,481,765 | | sao | 7.251.944 | 5,612,421 | 5,485,380 | 5,481,765 |
| webster | 41.458.703 | 13,972,648 | 12,059,432 | 11,991,421 | | webster | 41.458.703 | 13,972,648 | 12,059,432 | 11,991,421 |
| xml | 5.345.280 | 886,620 | 674,009 | 662,141 | | xml | 5.345.280 | 886,620| 674,009 | 662,141 |
| x-ray | 8.474.240 | 6,304,655 | 6,244,779 | 6,244,779 | | x-ray | 8.474.240 | 6,304,655 | 6,244,779 | 6,244,779 |
## License ## License
``` ```

183
src/external/sinfl.h vendored
View File

@ -10,7 +10,7 @@ as needed to keep the implementation as concise as possible.
- Dual license with either MIT or public domain - Dual license with either MIT or public domain
- Small implementation - Small implementation
- Deflate: 525 LoC - Deflate: 525 LoC
- Inflate: 500 LoC - Inflate: 320 LoC
- Webassembly: - Webassembly:
- Deflate ~3.7 KB (~2.2KB compressed) - Deflate ~3.7 KB (~2.2KB compressed)
- Inflate ~3.6 KB (~2.2KB compressed) - Inflate ~3.6 KB (~2.2KB compressed)
@ -39,10 +39,10 @@ this file implementation in *one* C or C++ file to prevent collisions.
| zlib 1.2.11 -1 | 72 MB/s | 307 MB/s | 42298774 | 42.30 | | zlib 1.2.11 -1 | 72 MB/s | 307 MB/s | 42298774 | 42.30 |
| zlib 1.2.11 -6 | 24 MB/s | 313 MB/s | 36548921 | 36.55 | | zlib 1.2.11 -6 | 24 MB/s | 313 MB/s | 36548921 | 36.55 |
| zlib 1.2.11 -9 | 20 MB/s | 314 MB/s | 36475792 | 36.48 | | zlib 1.2.11 -9 | 20 MB/s | 314 MB/s | 36475792 | 36.48 |
| sdefl 1.0 -0 | 127 MB/s | 355 MB/s | 40004116 | 39.88 | | sdefl 1.0 -0 | 127 MB/s | 371 MB/s | 40004116 | 39.88 |
| sdefl 1.0 -1 | 111 MB/s | 413 MB/s | 38940674 | 38.82 | | sdefl 1.0 -1 | 111 MB/s | 398 MB/s | 38940674 | 38.82 |
| sdefl 1.0 -5 | 45 MB/s | 436 MB/s | 36577183 | 36.46 | | sdefl 1.0 -5 | 45 MB/s | 420 MB/s | 36577183 | 36.46 |
| sdefl 1.0 -7 | 38 MB/s | 432 MB/s | 36523781 | 36.41 | | sdefl 1.0 -7 | 38 MB/s | 423 MB/s | 36523781 | 36.41 |
| libdeflate 1.3 -1 | 147 MB/s | 667 MB/s | 39597378 | 39.60 | | libdeflate 1.3 -1 | 147 MB/s | 667 MB/s | 39597378 | 39.60 |
| libdeflate 1.3 -6 | 69 MB/s | 689 MB/s | 36648318 | 36.65 | | libdeflate 1.3 -6 | 69 MB/s | 689 MB/s | 36648318 | 36.65 |
| libdeflate 1.3 -9 | 13 MB/s | 672 MB/s | 35197141 | 35.20 | | libdeflate 1.3 -9 | 13 MB/s | 672 MB/s | 35197141 | 35.20 |
@ -51,20 +51,20 @@ this file implementation in *one* C or C++ file to prevent collisions.
### Compression ### Compression
Results on the [Silesia compression corpus](http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia): Results on the [Silesia compression corpus](http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia):
| File | Original | `sdefl 0` | `sdefl 5` | `sdefl 7` | | File | Original | `sdefl 0` | `sdefl 5` | `sdefl 7` |
| --------| -----------| -------------| ---------- | ------------| | :------ | ---------: | -----------------: | ---------: | ----------: |
| dickens | 10.192.446 | 4,260,187 | 3,845,261 | 3,833,657 | | dickens | 10.192.446 | 4,260,187| 3,845,261| 3,833,657 |
| mozilla | 51.220.480 | 20,774,706 | 19,607,009 | 19,565,867 | | mozilla | 51.220.480 | 20,774,706 | 19,607,009 | 19,565,867 |
| mr | 9.970.564 | 3,860,531 | 3,673,460 | 3,665,627 | | mr | 9.970.564 | 3,860,531 | 3,673,460 | 3,665,627 |
| nci | 33.553.445 | 4,030,283 | 3,094,526 | 3,006,075 | | nci | 33.553.445 | 4,030,283 | 3,094,526 | 3,006,075 |
| ooffice | 6.152.192 | 3,320,063 | 3,186,373 | 3,183,815 | | ooffice | 6.152.192 | 3,320,063 | 3,186,373 | 3,183,815 |
| osdb | 10.085.684 | 3,919,646 | 3,649,510 | 3,649,477 | | osdb | 10.085.684 | 3,919,646 | 3,649,510 | 3,649,477 |
| reymont | 6.627.202 | 2,263,378 | 1,857,588 | 1,827,237 | | reymont | 6.627.202 | 2,263,378 | 1,857,588 | 1,827,237 |
| samba | 21.606.400 | 6,121,797 | 5,462,670 | 5,450,762 | | samba | 21.606.400 | 6,121,797 | 5,462,670 | 5,450,762 |
| sao | 7.251.944 | 5,612,421 | 5,485,380 | 5,481,765 | | sao | 7.251.944 | 5,612,421 | 5,485,380 | 5,481,765 |
| webster | 41.458.703 | 13,972,648 | 12,059,432 | 11,991,421 | | webster | 41.458.703 | 13,972,648 | 12,059,432 | 11,991,421 |
| xml | 5.345.280 | 886,620 | 674,009 | 662,141 | | xml | 5.345.280 | 886,620| 674,009 | 662,141 |
| x-ray | 8.474.240 | 6,304,655 | 6,244,779 | 6,244,779 | | x-ray | 8.474.240 | 6,304,655 | 6,244,779 | 6,244,779 |
## License ## License
``` ```
@ -151,7 +151,7 @@ extern int zsinflate(void *out, int cap, const void *in, int size);
#endif #endif
#ifndef SINFL_NO_SIMD #ifndef SINFL_NO_SIMD
#if defined(__x86_64__) || defined(_WIN32) || defined(_WIN64) #if __x86_64__ || defined(_WIN32) || defined(_WIN64)
#include <emmintrin.h> #include <emmintrin.h>
#define sinfl_char16 __m128i #define sinfl_char16 __m128i
#define sinfl_char16_ld(p) _mm_loadu_si128((const __m128i *)(void*)(p)) #define sinfl_char16_ld(p) _mm_loadu_si128((const __m128i *)(void*)(p))
@ -183,18 +183,6 @@ sinfl_read64(const void *p) {
memcpy(&n, p, 8); memcpy(&n, p, 8);
return n; return n;
} }
static void
sinfl_copy64(unsigned char **dst, unsigned char **src) {
unsigned long long n;
memcpy(&n, *src, 8);
memcpy(*dst, &n, 8);
*dst += 8, *src += 8;
}
static unsigned char*
sinfl_write64(unsigned char *dst, unsigned long long w) {
memcpy(dst, &w, 8);
return dst + 8;
}
#ifndef SINFL_NO_SIMD #ifndef SINFL_NO_SIMD
static unsigned char* static unsigned char*
sinfl_write128(unsigned char *dst, sinfl_char16 w) { sinfl_write128(unsigned char *dst, sinfl_char16 w) {
@ -207,12 +195,25 @@ sinfl_copy128(unsigned char **dst, unsigned char **src) {
sinfl_char16_str(*dst, n); sinfl_char16_str(*dst, n);
*dst += 16, *src += 16; *dst += 16, *src += 16;
} }
#else
static unsigned char*
sinfl_write64(unsigned char *dst, unsigned long long w) {
memcpy(dst, &w, 8);
return dst + 8;
}
static void
sinfl_copy64(unsigned char **dst, unsigned char **src) {
unsigned long long n;
memcpy(&n, *src, 8);
memcpy(*dst, &n, 8);
*dst += 8, *src += 8;
}
#endif #endif
static void static void
sinfl_refill(struct sinfl *s) { sinfl_refill(struct sinfl *s) {
s->bitbuf |= sinfl_read64(s->bitptr) << s->bitcnt; s->bitbuf |= sinfl_read64(s->bitptr) << s->bitcnt;
s->bitptr += (63 - s->bitcnt) >> 3; s->bitptr += (63 - s->bitcnt) >> 3;
s->bitcnt |= 56; /* bitcount in range [56,63] */ s->bitcnt |= 56; /* bitcount is in range [56,63] */
} }
static int static int
sinfl_peek(struct sinfl *s, int cnt) { sinfl_peek(struct sinfl *s, int cnt) {
@ -221,7 +222,7 @@ sinfl_peek(struct sinfl *s, int cnt) {
return s->bitbuf & ((1ull << cnt) - 1); return s->bitbuf & ((1ull << cnt) - 1);
} }
static void static void
sinfl_eat(struct sinfl *s, int cnt) { sinfl_consume(struct sinfl *s, int cnt) {
assert(cnt <= s->bitcnt); assert(cnt <= s->bitcnt);
s->bitbuf >>= cnt; s->bitbuf >>= cnt;
s->bitcnt -= cnt; s->bitcnt -= cnt;
@ -229,7 +230,7 @@ sinfl_eat(struct sinfl *s, int cnt) {
static int static int
sinfl__get(struct sinfl *s, int cnt) { sinfl__get(struct sinfl *s, int cnt) {
int res = sinfl_peek(s, cnt); int res = sinfl_peek(s, cnt);
sinfl_eat(s, cnt); sinfl_consume(s, cnt);
return res; return res;
} }
static int static int
@ -284,7 +285,7 @@ sinfl_build_subtbl(struct sinfl_gen *gen, unsigned *tbl, int tbl_bits,
while (1) { while (1) {
unsigned entry; unsigned entry;
int bit, stride, i; int bit, stride, i;
/* start new sub-table */ /* start new subtable */
if ((gen->word & ((1 << tbl_bits)-1)) != sub_prefix) { if ((gen->word & ((1 << tbl_bits)-1)) != sub_prefix) {
int used = 0; int used = 0;
sub_prefix = gen->word & ((1 << tbl_bits)-1); sub_prefix = gen->word & ((1 << tbl_bits)-1);
@ -298,7 +299,7 @@ sinfl_build_subtbl(struct sinfl_gen *gen, unsigned *tbl, int tbl_bits,
tbl_end = sub_start + (1 << sub_bits); tbl_end = sub_start + (1 << sub_bits);
tbl[sub_prefix] = (sub_start << 16) | 0x10 | (sub_bits & 0xf); tbl[sub_prefix] = (sub_start << 16) | 0x10 | (sub_bits & 0xf);
} }
/* fill sub-table */ /* fill subtable */
entry = (*gen->sorted << 16) | ((gen->len - tbl_bits) & 0xf); entry = (*gen->sorted << 16) | ((gen->len - tbl_bits) & 0xf);
gen->sorted++; gen->sorted++;
i = sub_start + (gen->word >> tbl_bits); i = sub_start + (gen->word >> tbl_bits);
@ -352,17 +353,18 @@ sinfl_build(unsigned *tbl, unsigned char *lens, int tbl_bits, int maxlen,
} }
static int static int
sinfl_decode(struct sinfl *s, const unsigned *tbl, int bit_len) { sinfl_decode(struct sinfl *s, const unsigned *tbl, int bit_len) {
int idx = sinfl_peek(s, bit_len); sinfl_refill(s);
{int idx = sinfl_peek(s, bit_len);
unsigned key = tbl[idx]; unsigned key = tbl[idx];
if (key & 0x10) { if (key & 0x10) {
/* sub-table lookup */ /* sub-table lookup */
int len = key & 0x0f; int len = key & 0x0f;
sinfl_eat(s, bit_len); sinfl_consume(s, bit_len);
idx = sinfl_peek(s, len); idx = sinfl_peek(s, len);
key = tbl[((key >> 16) & 0xffff) + (unsigned)idx]; key = tbl[((key >> 16) & 0xffff) + (unsigned)idx];
} }
sinfl_eat(s, key & 0x0f); sinfl_consume(s, key & 0x0f);
return (key >> 16) & 0x0fff; return (key >> 16) & 0x0fff;}
} }
static int static int
sinfl_decompress(unsigned char *out, int cap, const unsigned char *in, int size) { sinfl_decompress(unsigned char *out, int cap, const unsigned char *in, int size) {
@ -400,11 +402,11 @@ sinfl_decompress(unsigned char *out, int cap, const unsigned char *in, int size)
} break; } break;
case stored: { case stored: {
/* uncompressed block */ /* uncompressed block */
int len, nlen; int len;
sinfl_refill(&s); sinfl_refill(&s);
sinfl__get(&s,s.bitcnt & 7); sinfl__get(&s,s.bitcnt & 7);
len = sinfl__get(&s,16); len = sinfl__get(&s,16);
nlen = sinfl__get(&s,16); //int nlen = sinfl__get(&s,16); // @raysan5: Unused variable?
in -= 2; s.bitcnt = 0; in -= 2; s.bitcnt = 0;
if (len > (e-in) || !len) if (len > (e-in) || !len)
@ -428,58 +430,40 @@ sinfl_decompress(unsigned char *out, int cap, const unsigned char *in, int size)
state = blk; state = blk;
} break; } break;
case dyn: { case dyn: {
/* dynamic huffman codes */ /* dynamic huffman codes */
int n, i; int n, i;
unsigned hlens[SINFL_PRE_TBL_SIZE]; unsigned hlens[SINFL_PRE_TBL_SIZE];
unsigned char nlens[19] = {0}, lens[288+32]; unsigned char nlens[19] = {0}, lens[288+32];
sinfl_refill(&s);
{int nlit = 257 + sinfl__get(&s,5);
int ndist = 1 + sinfl__get(&s,5);
int nlen = 4 + sinfl__get(&s,4);
for (n = 0; n < nlen; n++)
nlens[order[n]] = (unsigned char)sinfl_get(&s,3);
sinfl_build(hlens, nlens, 7, 7, 19);
/* decode code lengths */
for (n = 0; n < nlit + ndist;) {
sinfl_refill(&s); sinfl_refill(&s);
int sym = sinfl_decode(&s, hlens, 7); {int nlit = 257 + sinfl__get(&s,5);
switch (sym) {default: lens[n++] = (unsigned char)sym; break; int ndist = 1 + sinfl__get(&s,5);
case 16: for (i=3+sinfl_get(&s,2);i;i--,n++) lens[n]=lens[n-1]; break; int nlen = 4 + sinfl__get(&s,4);
case 17: for (i=3+sinfl_get(&s,3);i;i--,n++) lens[n]=0; break; for (n = 0; n < nlen; n++)
case 18: for (i=11+sinfl_get(&s,7);i;i--,n++) lens[n]=0; break;} nlens[order[n]] = (unsigned char)sinfl_get(&s,3);
} sinfl_build(hlens, nlens, 7, 7, 19);
/* build lit/dist tables */
sinfl_build(s.lits, lens, 10, 15, nlit); /* decode code lengths */
sinfl_build(s.dsts, lens + nlit, 8, 15, ndist); for (n = 0; n < nlit + ndist;) {
state = blk;} int sym = sinfl_decode(&s, hlens, 7);
switch (sym) {default: lens[n++] = (unsigned char)sym; break;
case 16: for (i=3+sinfl_get(&s,2);i;i--,n++) lens[n]=lens[n-1]; break;
case 17: for (i=3+sinfl_get(&s,3);i;i--,n++) lens[n]=0; break;
case 18: for (i=11+sinfl_get(&s,7);i;i--,n++) lens[n]=0; break;}
}
/* build lit/dist tables */
sinfl_build(s.lits, lens, 10, 15, nlit);
sinfl_build(s.dsts, lens + nlit, 8, 15, ndist);
state = blk;}
} break; } break;
case blk: { case blk: {
/* decompress block */ /* decompress block */
while (1) { int sym = sinfl_decode(&s, s.lits, 10);
if (sym < 256) {
/* literal */
*out++ = (unsigned char)sym;
} else if (sym > 256) {sym -= 257; /* match symbol */
sinfl_refill(&s); sinfl_refill(&s);
int sym = sinfl_decode(&s, s.lits, 10);
if (sym < 256) {
/* literal */
if (sinfl_unlikely(out >= oe)) {
return (int)(out-o);
}
*out++ = (unsigned char)sym;
sym = sinfl_decode(&s, s.lits, 10);
if (sym < 256) {
*out++ = (unsigned char)sym;
continue;
}
}
if (sinfl_unlikely(sym == 256)) {
/* end of block */
if (last) return (int)(out-o);
state = hdr;
break;
}
/* match */
sym -= 257;
{int len = sinfl__get(&s, lbits[sym]) + lbase[sym]; {int len = sinfl__get(&s, lbits[sym]) + lbase[sym];
int dsym = sinfl_decode(&s, s.dsts, 8); int dsym = sinfl_decode(&s, s.dsts, 8);
int offs = sinfl__get(&s, dbits[dsym]) + dbase[dsym]; int offs = sinfl__get(&s, dbits[dsym]) + dbase[dsym];
@ -492,17 +476,11 @@ sinfl_decompress(unsigned char *out, int cap, const unsigned char *in, int size)
#ifndef SINFL_NO_SIMD #ifndef SINFL_NO_SIMD
if (sinfl_likely(oe - out >= 16 * 3)) { if (sinfl_likely(oe - out >= 16 * 3)) {
if (offs >= 16) { if (offs >= 16) {
/* simd copy match */ /* copy match */
sinfl_copy128(&dst, &src); sinfl_copy128(&dst, &src);
sinfl_copy128(&dst, &src); sinfl_copy128(&dst, &src);
do sinfl_copy128(&dst, &src); do sinfl_copy128(&dst, &src);
while (dst < out); while (dst < out);
} else if (offs >= 8) {
/* word copy match */
sinfl_copy64(&dst, &src);
sinfl_copy64(&dst, &src);
do sinfl_copy64(&dst, &src);
while (dst < out);
} else if (offs == 1) { } else if (offs == 1) {
/* rle match copying */ /* rle match copying */
sinfl_char16 w = sinfl_char16_char(src[0]); sinfl_char16 w = sinfl_char16_char(src[0]);
@ -511,7 +489,6 @@ sinfl_decompress(unsigned char *out, int cap, const unsigned char *in, int size)
do dst = sinfl_write128(dst, w); do dst = sinfl_write128(dst, w);
while (dst < out); while (dst < out);
} else { } else {
/* byte copy match */
*dst++ = *src++; *dst++ = *src++;
*dst++ = *src++; *dst++ = *src++;
do *dst++ = *src++; do *dst++ = *src++;
@ -521,7 +498,7 @@ sinfl_decompress(unsigned char *out, int cap, const unsigned char *in, int size)
#else #else
if (sinfl_likely(oe - out >= 3 * 8 - 3)) { if (sinfl_likely(oe - out >= 3 * 8 - 3)) {
if (offs >= 8) { if (offs >= 8) {
/* word copy match */ /* copy match */
sinfl_copy64(&dst, &src); sinfl_copy64(&dst, &src);
sinfl_copy64(&dst, &src); sinfl_copy64(&dst, &src);
do sinfl_copy64(&dst, &src); do sinfl_copy64(&dst, &src);
@ -536,7 +513,6 @@ sinfl_decompress(unsigned char *out, int cap, const unsigned char *in, int size)
do dst = sinfl_write64(dst, w); do dst = sinfl_write64(dst, w);
while (dst < out); while (dst < out);
} else { } else {
/* byte copy match */
*dst++ = *src++; *dst++ = *src++;
*dst++ = *src++; *dst++ = *src++;
do *dst++ = *src++; do *dst++ = *src++;
@ -548,8 +524,13 @@ sinfl_decompress(unsigned char *out, int cap, const unsigned char *in, int size)
*dst++ = *src++; *dst++ = *src++;
*dst++ = *src++; *dst++ = *src++;
do *dst++ = *src++; do *dst++ = *src++;
while (dst < out); while (dst < out);}
}} }
} else {
/* end of block */
if (last) return (int)(out-o);
state = hdr;
break;
} }
} break;} } break;}
} }