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/*
* hbytes - hex-stringrep efficient byteblocks for Tcl
* Copyright 2006-2012 Ian Jackson
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "hbytes.h"
#define COMPLEX(hb) ((HBytes_ComplexValue*)hb->begin_complex)
#define SIMPLE_LEN(hb) ((Byte*)(hb)->end_0 - (Byte*)(hb)->begin_complex)
/* enquirers */
int cht_hb_len(const HBytes_Value *hb) {
if (HBYTES_ISEMPTY(hb)) return 0;
else if (HBYTES_ISCOMPLEX(hb)) return COMPLEX(hb)->len;
else return SIMPLE_LEN(hb);
}
Byte *cht_hb_data(const HBytes_Value *hb) {
if (HBYTES_ISEMPTY(hb)) return 0;
else if (HBYTES_ISCOMPLEX(hb)) return COMPLEX(hb)->dstart;
else return hb->begin_complex;
}
int cht_hb_issentinel(const HBytes_Value *hb) {
return HBYTES_ISSENTINEL(hb);
}
/* constructors */
void cht_hb_empty(HBytes_Value *returns) {
returns->begin_complex= returns->end_0= 0;
}
void cht_hb_sentinel(HBytes_Value *returns) {
returns->begin_complex= 0;
returns->end_0= (void*)&cht_hbytes_type;
}
Byte *cht_hb_arrayspace(HBytes_Value *returns, int l) {
if (!l) { cht_hb_empty(returns); return 0; }
returns->begin_complex= TALLOC(l);
returns->end_0= returns->begin_complex + l;
return returns->begin_complex;
}
void cht_hb_array(HBytes_Value *returns, const Byte *array, int l) {
memcpy(cht_hb_arrayspace(returns,l), array, l);
}
/* destructor */
void cht_hb_free(const HBytes_Value *frees) {
if (HBYTES_ISCOMPLEX(frees)) {
HBytes_ComplexValue *cx= COMPLEX(frees);
TFREE(cx->dstart - cx->prespace);
}
TFREE(frees->begin_complex);
}
/* mutators */
static HBytes_ComplexValue *complex(HBytes_Value *hb) {
HBytes_ComplexValue *cx;
if (HBYTES_ISCOMPLEX(hb)) return hb->begin_complex;
cx= TALLOC(sizeof(*cx));
cx->dstart= hb->begin_complex;
cx->len= cx->avail= SIMPLE_LEN(hb);
cx->prespace= 0;
hb->begin_complex= cx;
hb->end_0= 0;
return cx;
}
Byte *cht_hb_prepend(HBytes_Value *hb, int el) {
HBytes_ComplexValue *cx;
int new_prespace;
Byte *old_block, *new_block, *new_dstart;
cx= complex(hb);
assert(el < INT_MAX/4 && cx->len < INT_MAX/2);
if (cx->prespace < el) {
new_prespace= el*2 + cx->len;
old_block= cx->dstart - cx->prespace;
new_block= Tcl_Realloc(old_block, new_prespace + cx->avail);
new_dstart= new_block + new_prespace;
memmove(new_dstart, new_block + cx->prespace, cx->len);
cx->prespace= new_prespace;
cx->dstart= new_dstart;
}
cx->dstart -= el;
cx->prespace -= el;
cx->len += el;
cx->avail += el;
return cx->dstart;
}
Byte *cht_hb_append(HBytes_Value *hb, int el) {
HBytes_ComplexValue *cx;
int new_len, new_avail;
Byte *newpart, *new_block, *old_block;
cx= complex(hb);
assert(el < INT_MAX/4 && cx->len < INT_MAX/4);
new_len= cx->len + el;
if (new_len > cx->avail) {
new_avail= new_len*2;
old_block= cx->dstart - cx->prespace;
new_block= Tcl_Realloc(old_block, cx->prespace + new_avail);
cx->dstart= new_block + cx->prespace;
cx->avail= new_avail;
}
newpart= cx->dstart + cx->len;
cx->len= new_len;
return newpart;
}
static HBytes_ComplexValue*
prechop(HBytes_Value *hb, int cl, const Byte **rv) {
HBytes_ComplexValue *cx;
if (cl<0) { *rv=0; return 0; }
if (cl==0) { *rv= (const void*)&cht_hbytes_type; return 0; }
cx= complex(hb);
if (cl > cx->len) { *rv=0; return 0; }
return cx;
}
const Byte *cht_hb_unprepend(HBytes_Value *hb, int pl) {
const Byte *chopped;
HBytes_ComplexValue *cx= prechop(hb,pl,&chopped);
if (!cx) return chopped;
chopped= cx->dstart;
cx->dstart += pl;
cx->prespace += pl;
cx->len -= pl;
cx->avail -= pl;
return chopped;
}
const Byte *cht_hb_unappend(HBytes_Value *hb, int sl) {
const Byte *chopped;
HBytes_ComplexValue *cx= prechop(hb,sl,&chopped);
if (!cx) return chopped;
cx->len -= sl;
return cx->dstart + cx->len;
}
void memxor(Byte *dest, const Byte *src, int l) {
while (l--) *dest++ ^= *src++;
}
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