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Added optional buffer offset parameters to compressWithFilters().

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committer: mfx <mfx> 974485183 +0000
This commit is contained in:
Markus F.X.J. Oberhumer 2000-11-17 18:19:43 +00:00
parent f86d4f1992
commit bd7d18d046
2 changed files with 18 additions and 23 deletions
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35
src/packer.cpp
View File

@ -155,7 +155,7 @@ bool Packer::compress(upx_bytep in, upx_bytep out,
assert(level >= 1); assert(level <= 10);
// update checksum of uncompressed data
unsigned saved_u_adler = ph.u_adler;
const unsigned saved_u_adler = ph.u_adler;
ph.u_adler = upx_adler32(ph.u_adler,in,ph.u_len);
// set compression paramters
@ -178,17 +178,6 @@ bool Packer::compress(upx_bytep in, upx_bytep out,
conf.p_level = opt->crp.p_level;
if (opt->crp.h_level != -1)
conf.h_level = opt->crp.h_level;
else if (level >= 7)
{
static const int h_level[9] =
{ 0, 17, 18, 19, 20, 4369, 4626, 4883, 5140 };
int ml = opt->mem_level;
if (ml < 0)
ml = 9;
if (ml < 1 || ml > 9)
ml = 1;
conf.h_level = h_level[ml - 1];
}
if (opt->crp.max_offset != UPX_UINT_MAX && opt->crp.max_offset < conf.max_offset)
conf.max_offset = opt->crp.max_offset;
if (opt->crp.max_match != UPX_UINT_MAX && opt->crp.max_match < conf.max_match)
@ -974,6 +963,7 @@ void Packer::addFilter32(int filter_id)
// n: try the first N filters in parm_filters[], use best one
// -1: try all filters, use first working one
// -2: try only the opt->filter filter
// -3: use no filter
//
// This has been prepared for generalization into class Packer so that
// opt->all_filters is available for all executable formats.
@ -984,7 +974,8 @@ void Packer::addFilter32(int filter_id)
void Packer::compressWithFilters(Filter *parm_ft, unsigned *parm_overlapoh,
const unsigned overlap_range,
int strategy, const int *parm_filters,
unsigned max_offset, unsigned max_match)
unsigned max_offset, unsigned max_match,
unsigned filter_off, unsigned compress_buf_off)
{
const int *f;
//
@ -994,8 +985,8 @@ void Packer::compressWithFilters(Filter *parm_ft, unsigned *parm_overlapoh,
const Filter orig_ft = *parm_ft;
Filter best_ft = *parm_ft;
//
const unsigned buf_len = orig_ph.u_len;
const unsigned filter_len = orig_ft.buf_len ? orig_ft.buf_len : buf_len;
const unsigned compress_buf_len = orig_ph.u_len;
const unsigned filter_len = orig_ft.buf_len ? orig_ft.buf_len : compress_buf_len;
//
best_ph.c_len = orig_ph.u_len;
unsigned best_ph_lsize = 0;
@ -1004,7 +995,7 @@ void Packer::compressWithFilters(Filter *parm_ft, unsigned *parm_overlapoh,
// preconditions
assert(orig_ph.filter == 0);
assert(orig_ft.id == 0);
assert(filter_len <= buf_len);
assert(filter_off + filter_len <= compress_buf_off + compress_buf_len);
// setup raw_filters
static const int no_filters[] = { 0, -1 };
@ -1021,6 +1012,8 @@ void Packer::compressWithFilters(Filter *parm_ft, unsigned *parm_overlapoh,
strategy_filters[0] = opt->filter;
raw_filters = strategy_filters;
}
else if (strategy == -3)
raw_filters = no_filters;
// first pass - count number of filters
int raw_nfilters = 0;
@ -1064,7 +1057,7 @@ void Packer::compressWithFilters(Filter *parm_ft, unsigned *parm_overlapoh,
MemBuffer otemp_buf;
if (nfilters > 1 && strategy >= 0)
{
otemp_buf.allocForCompression(buf_len);
otemp_buf.allocForCompression(compress_buf_len);
otemp = otemp_buf;
}
@ -1079,8 +1072,8 @@ void Packer::compressWithFilters(Filter *parm_ft, unsigned *parm_overlapoh,
Filter ft = orig_ft;
ft.init(filters[i], orig_ft.addvalue);
// filter
optimizeFilter(&ft, ibuf, filter_len);
bool success = ft.filter(ibuf, filter_len);
optimizeFilter(&ft, ibuf + filter_off, filter_len);
bool success = ft.filter(ibuf + filter_off, filter_len);
if (ft.id != 0 && ft.calls == 0)
{
// filter did not do anything - no need to call ft.unfilter()
@ -1097,7 +1090,7 @@ void Packer::compressWithFilters(Filter *parm_ft, unsigned *parm_overlapoh,
nfilters_success++;
ph.filter_cto = ft.cto;
// compress
if (compress(ibuf, otemp, max_offset, max_match))
if (compress(ibuf + compress_buf_off, otemp, max_offset, max_match))
{
// get results
const unsigned lsize = buildLoader(&ft);
@ -1119,7 +1112,7 @@ void Packer::compressWithFilters(Filter *parm_ft, unsigned *parm_overlapoh,
}
}
// restore ibuf[] - unfilter with verify
ft.unfilter(ibuf, filter_len, true);
ft.unfilter(ibuf + filter_off, filter_len, true);
//
if (strategy < 0)
break;

6
src/packer.h
View File

@ -153,8 +153,10 @@ protected:
// high-level compression drivers
void compressWithFilters(Filter *ft, unsigned *overlapoh,
const unsigned overlap_range,
int strategy=-1, const int *filters=NULL,
unsigned max_offset = 0, unsigned max_match = 0);
int strategy = -1, const int *filters = NULL,
unsigned max_offset = 0, unsigned max_match = 0,
unsigned filter_buf_off = 0,
unsigned compress_buf_off = 0);
// util for verifying overlapping decompresion
// non-destructive test