public static void LZ4_freeStreamDecode(LZ4_streamDecode_t *LZ4_stream)
{
if (LZ4_stream != null)
{
Mem.Free(LZ4_stream);
}
}
public static void LZ4_setStreamDecode(
LZ4_streamDecode_t *lz4sd, byte *dictionary, int dictSize)
{
lz4sd->prefixSize = (uint)dictSize;
lz4sd->prefixEnd = dictionary + dictSize;
lz4sd->externalDict = null;
lz4sd->extDictSize = 0;
}
public static int LZ4_decompress_safe_continue(
LZ4_streamDecode_t *lz4sd,
byte *source,
byte *dest,
int compressedSize,
int maxOutputSize)
{
int result;
if (lz4sd->prefixEnd == dest)
{
result = LZ4_decompress_generic(
source,
dest,
compressedSize,
maxOutputSize,
endCondition_directive.endOnInputSize,
earlyEnd_directive.full,
0,
dict_directive.usingExtDict,
lz4sd->prefixEnd - lz4sd->prefixSize,
lz4sd->externalDict,
(int)lz4sd->extDictSize);
if (result <= 0)
{
return(result);
}
lz4sd->prefixSize += (uint)result;
lz4sd->prefixEnd += result;
}
else
{
lz4sd->extDictSize = lz4sd->prefixSize;
lz4sd->externalDict = lz4sd->prefixEnd - lz4sd->extDictSize;
result = LZ4_decompress_generic(
source,
dest,
compressedSize,
maxOutputSize,
endCondition_directive.endOnInputSize,
earlyEnd_directive.full,
0,
dict_directive.usingExtDict,
dest,
lz4sd->externalDict,
(int)lz4sd->extDictSize);
if (result <= 0)
{
return(result);
}
lz4sd->prefixSize = (uint)result;
lz4sd->prefixEnd = dest + result;
}
return(result);
}
public static int LZ4_decompress_safe_continue(
LZ4_streamDecode_t *LZ4_streamDecode, byte *source, byte *dest, int compressedSize,
int maxOutputSize)
{
var lz4sd = LZ4_streamDecode;
int result;
if (lz4sd->prefixSize == 0)
{
/* The first call, no dictionary yet. */
Assert(lz4sd->extDictSize == 0);
result = LZ4_decompress_safe(source, dest, compressedSize, maxOutputSize);
if (result <= 0)
{
return(result);
}
lz4sd->prefixSize = (size_t)result;
lz4sd->prefixEnd = (byte *)dest + result;
}
else if (lz4sd->prefixEnd == (byte *)dest)
{
/* They're rolling the current segment. */
if (lz4sd->prefixSize >= 64 * KB - 1)
{
result = LZ4_decompress_safe_withPrefix64k(
source, dest, compressedSize, maxOutputSize);
}
else if (lz4sd->extDictSize == 0)
{
result = LZ4_decompress_safe_withSmallPrefix(
source, dest, compressedSize, maxOutputSize, lz4sd->prefixSize);
}
else
{
result = LZ4_decompress_safe_doubleDict(
source, dest, compressedSize, maxOutputSize, lz4sd->prefixSize,
lz4sd->externalDict, lz4sd->extDictSize);
}
if (result <= 0)
{
return(result);
}
lz4sd->prefixSize += (size_t)result;
lz4sd->prefixEnd += result;
}
else
{
/* The buffer wraps around, or they're switching to another buffer. */
lz4sd->extDictSize = lz4sd->prefixSize;
lz4sd->externalDict = lz4sd->prefixEnd - lz4sd->extDictSize;
result = LZ4_decompress_safe_forceExtDict(
source, dest, compressedSize, maxOutputSize,
lz4sd->externalDict, lz4sd->extDictSize);
if (result <= 0)
{
return(result);
}
lz4sd->prefixSize = (size_t)result;
lz4sd->prefixEnd = (byte *)dest + result;
}
return(result);
}
