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C part of decompressor

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-09-21 11:22:52 +02:00
parent c5b4cd370e
commit f8926c32b4
9 changed files with 272 additions and 20 deletions
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40
grub-core/lib/LzmaDec.c
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@ -26,7 +26,14 @@
#include <grub/lib/LzmaDec.h>
#include <string.h>
static void
memcpy (void *a_, const void *b_, unsigned s)
{
char *a = a_;
const char *b = b_;
while (s--)
*a++ = *b++;
}
#define kNumTopBits 24
#define kTopValue ((UInt32)1 << kNumTopBits)
@ -294,14 +301,14 @@ static int MY_FAST_CALL LzmaDec_DecodeReal(CLzmaDec *p, SizeT limit, const Byte
prob = probs + RepLenCoder;
}
{
unsigned limit, offset;
unsigned limit2, offset;
CLzmaProb *probLen = prob + LenChoice;
IF_BIT_0(probLen)
{
UPDATE_0(probLen);
probLen = prob + LenLow + (posState << kLenNumLowBits);
offset = 0;
limit = (1 << kLenNumLowBits);
limit2 = (1 << kLenNumLowBits);
}
else
{
@ -312,17 +319,17 @@ static int MY_FAST_CALL LzmaDec_DecodeReal(CLzmaDec *p, SizeT limit, const Byte
UPDATE_0(probLen);
probLen = prob + LenMid + (posState << kLenNumMidBits);
offset = kLenNumLowSymbols;
limit = (1 << kLenNumMidBits);
limit2 = (1 << kLenNumMidBits);
}
else
{
UPDATE_1(probLen);
probLen = prob + LenHigh;
offset = kLenNumLowSymbols + kLenNumMidSymbols;
limit = (1 << kLenNumHighBits);
limit2 = (1 << kLenNumHighBits);
}
}
TREE_DECODE(probLen, limit, len);
TREE_DECODE(probLen, limit2, len);
len += offset;
}
@ -718,7 +725,7 @@ static void LzmaDec_InitRc(CLzmaDec *p, const Byte *data)
p->needFlush = 0;
}
void LzmaDec_InitDicAndState(CLzmaDec *p, Bool initDic, Bool initState)
static void LzmaDec_InitDicAndState(CLzmaDec *p, Bool initDic, Bool initState)
{
p->needFlush = 1;
p->remainLen = 0;
@ -915,6 +922,7 @@ SRes LzmaDec_DecodeToBuf(CLzmaDec *p, Byte *dest, SizeT *destLen, const Byte *sr
void LzmaDec_FreeProbs(CLzmaDec *p, ISzAlloc *alloc)
{
return ;
alloc->Free(alloc, p->probs);
p->probs = 0;
}
@ -957,13 +965,16 @@ SRes LzmaProps_Decode(CLzmaProps *p, const Byte *data, unsigned size)
return SZ_OK;
}
static char sal[30000], *sptr = sal;
static SRes LzmaDec_AllocateProbs2(CLzmaDec *p, const CLzmaProps *propNew, ISzAlloc *alloc)
{
UInt32 numProbs = LzmaProps_GetNumProbs(propNew);
if (p->probs == 0 || numProbs != p->numProbs)
{
LzmaDec_FreeProbs(p, alloc);
p->probs = (CLzmaProb *)alloc->Alloc(alloc, numProbs * sizeof(CLzmaProb));
p->probs = (CLzmaProb *) sptr;
sptr += sizeof (CLzmaProb);
p->numProbs = numProbs;
if (p->probs == 0)
return SZ_ERROR_MEM;
@ -1033,3 +1044,16 @@ SRes LzmaDecode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
LzmaDec_FreeProbs(&p, alloc);
return res;
}
void
grub_decompress_core (void *src, void *dst, unsigned long srcsize, unsigned long dstsize);
void
grub_decompress_core (void *src, void *dst, unsigned long srcsize, unsigned long dstsize)
{
char *src_ = src, *dst_ = dst;
(void) dstsize;
while (srcsize--)
*dst_++ = *src_++ ^ 0x5a;
}