greg/pcompress
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Use Libbsc for XML data in adapt2 mode.

Browse source
This commit is contained in:
Moinak Ghosh 2012-11-04 21:13:26 +05:30
parent ddda9e5320
commit f0c7ba87a3
2 changed files with 47 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

47
adaptive_compress.c
View file

@ -36,10 +36,12 @@
#include <allocator.h>
#define FIFTY_PCT(x) (((x)/10) * 5)
#define TWENTY_PCT(x) (((x)/10) * 2)
#define FORTY_PCT(x) (((x)/10) * 4)
#define ONE_PCT(x) ((x)/100)
static unsigned int lzma_count = 0;
static unsigned int bzip2_count = 0;
static unsigned int bsc_count = 0;
static unsigned int ppmd_count = 0;
extern int lzma_compress(void *src, size_t srclen, void *dst,
@ -48,6 +50,8 @@ extern int bzip2_compress(void *src, size_t srclen, void *dst,
size_t *destlen, int level, uchar_t chdr, void *data);
extern int ppmd_compress(void *src, size_t srclen, void *dst,
size_t *dstlen, int level, uchar_t chdr, void *data);
extern int libbsc_compress(void *src, size_t srclen, void *dst,
size_t *dstlen, int level, uchar_t chdr, void *data);
extern int lzma_decompress(void *src, size_t srclen, void *dst,
size_t *dstlen, int level, uchar_t chdr, void *data);
@ -55,15 +59,20 @@ extern int bzip2_decompress(void *src, size_t srclen, void *dst,
size_t *dstlen, int level, uchar_t chdr, void *data);
extern int ppmd_decompress(void *src, size_t srclen, void *dst,
size_t *dstlen, int level, uchar_t chdr, void *data);
extern int libbsc_decompress(void *src, size_t srclen, void *dst,
size_t *dstlen, int level, uchar_t chdr, void *data);
extern int lzma_init(void **data, int *level, int nthreads, ssize_t chunksize);
extern int lzma_deinit(void **data);
extern int ppmd_init(void **data, int *level, int nthreads, ssize_t chunksize);
extern int ppmd_deinit(void **data);
extern int libbsc_init(void **data, int *level, int nthreads, ssize_t chunksize);
extern int libbsc_deinit(void **data);
struct adapt_data {
void *lzma_data;
void *ppmd_data;
void *bsc_data;
int adapt_mode;
};
@ -73,11 +82,13 @@ adapt_stats(int show)
if (show) {
fprintf(stderr, "Adaptive mode stats:\n");
fprintf(stderr, " BZIP2 chunk count: %u\n", bzip2_count);
fprintf(stderr, " LIBBSC chunk count: %u\n", bsc_count);
fprintf(stderr, " PPMd chunk count: %u\n", ppmd_count);
fprintf(stderr, " LZMA chunk count: %u\n\n", lzma_count);
}
lzma_count = 0;
bzip2_count = 0;
bsc_count = 0;
ppmd_count = 0;
}
@ -92,12 +103,14 @@ adapt_init(void **data, int *level, int nthreads, ssize_t chunksize)
adat->adapt_mode = 1;
rv = ppmd_init(&(adat->ppmd_data), level, nthreads, chunksize);
adat->lzma_data = NULL;
adat->bsc_data = NULL;
*data = adat;
if (*level > 9) *level = 9;
}
lzma_count = 0;
bzip2_count = 0;
ppmd_count = 0;
bsc_count = 0;
return (rv);
}
@ -116,9 +129,16 @@ adapt2_init(void **data, int *level, int nthreads, ssize_t chunksize)
lv = *level;
if (rv == 0)
rv = lzma_init(&(adat->lzma_data), &lv, nthreads, chunksize);
lv = *level;
if (rv == 0)
rv = libbsc_init(&(adat->bsc_data), &lv, nthreads, chunksize);
*data = adat;
if (*level > 9) *level = 9;
}
lzma_count = 0;
bzip2_count = 0;
ppmd_count = 0;
bsc_count = 0;
return (rv);
}
@ -144,21 +164,25 @@ adapt_compress(void *src, size_t srclen, void *dst,
{
struct adapt_data *adat = (struct adapt_data *)(data);
uchar_t *src1 = (uchar_t *)src;
size_t i, tot8b;
int rv;
size_t i, tot8b, tagcnt;
int rv, tag;
/*
* Count number of 8-bit binary bytes in source.
* Count number of 8-bit binary bytes and XML tags in source.
*/
tot8b = 0;
for (i = 0; i < srclen; i++)
tagcnt = 0;
for (i = 0; i < srclen; i++) {
tot8b += (src1[i] >> 7);
tag = ((src1[i] == '<') | (src1[i] == '>'));
tagcnt += tag;
}
/*
* Use PPMd if some percentage of source is 7-bit textual bytes, otherwise
* use Bzip2 or LZMA.
*/
if (adat->adapt_mode == 2 && tot8b > TWENTY_PCT(srclen)) {
if (adat->adapt_mode == 2 && tot8b > FORTY_PCT(srclen)) {
rv = lzma_compress(src, srclen, dst, dstlen, level, chdr, adat->lzma_data);
if (rv < 0)
return (rv);
@ -172,6 +196,13 @@ adapt_compress(void *src, size_t srclen, void *dst,
rv = COMPRESS_BZIP2;
bzip2_count++;
} else {
if (tagcnt > ONE_PCT(srclen)) {
rv = libbsc_compress(src, srclen, dst, dstlen, level, chdr, adat->bsc_data);
if (rv < 0)
return (rv);
rv = COMPRESS_BSC;
bsc_count++;
} else {
rv = ppmd_compress(src, srclen, dst, dstlen, level, chdr, adat->ppmd_data);
if (rv < 0)
@ -179,6 +210,7 @@ adapt_compress(void *src, size_t srclen, void *dst,
rv = COMPRESS_PPMD;
ppmd_count++;
}
}
return (rv);
}
@ -201,6 +233,9 @@ adapt_decompress(void *src, size_t srclen, void *dst,
} else if (cmp_flags == COMPRESS_PPMD) {
return (ppmd_decompress(src, srclen, dst, dstlen, level, chdr, adat->ppmd_data));
} else if (cmp_flags == COMPRESS_BSC) {
return (libbsc_decompress(src, srclen, dst, dstlen, level, chdr, adat->bsc_data));
} else {
fprintf(stderr, "Unrecognized compression mode, file corrupt.\n");
}

1
pcompress.h
View file

@ -72,6 +72,7 @@ extern "C" {
#define COMPRESS_LZMA 1
#define COMPRESS_BZIP2 2
#define COMPRESS_PPMD 3
#define COMPRESS_BSC 4
#define CHDR_ALGO_MASK 7
extern uint32_t zlib_buf_extra(ssize_t buflen);