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// PpmdEncoder.cpp
#include "StdAfx.h"
#include "../../../C/Alloc.h"
#include "../Common/StreamUtils.h"
#include "PpmdEncoder.h"
namespace NCompress {
namespace NPpmd {
static const UInt32 kBufSize = (1 << 20);
static const Byte kOrders[10] = { 3, 4, 4, 5, 5, 6, 8, 16, 24, 32 };
void CEncProps::Normalize(int level)
{
if (level < 0) level = 5;
if (level > 9) level = 9;
if (MemSize == (UInt32)(Int32)-1)
MemSize = (UInt32)1 << (level + 19);
const unsigned kMult = 16;
if (MemSize / kMult > ReduceSize)
{
for (unsigned i = 16; i < 32; i++)
{
UInt32 m = (UInt32)1 << i;
if (ReduceSize <= m / kMult)
{
if (MemSize > m)
MemSize = m;
break;
}
}
}
if (Order == -1) Order = kOrders[(unsigned)level];
}
CEncoder::CEncoder():
_inBuf(NULL)
{
_props.Normalize(-1);
Ppmd7_Construct(&_ppmd);
_ppmd.rc.enc.Stream = &_outStream.vt;
}
CEncoder::~CEncoder()
{
::MidFree(_inBuf);
Ppmd7_Free(&_ppmd, &g_BigAlloc);
}
Z7_COM7F_IMF(CEncoder::SetCoderProperties(const PROPID *propIDs, const PROPVARIANT *coderProps, UInt32 numProps))
{
int level = -1;
CEncProps props;
for (UInt32 i = 0; i < numProps; i++)
{
const PROPVARIANT &prop = coderProps[i];
const PROPID propID = propIDs[i];
if (propID > NCoderPropID::kReduceSize)
continue;
if (propID == NCoderPropID::kReduceSize)
{
if (prop.vt == VT_UI8 && prop.uhVal.QuadPart < (UInt32)(Int32)-1)
props.ReduceSize = (UInt32)prop.uhVal.QuadPart;
continue;
}
if (propID == NCoderPropID::kUsedMemorySize)
{
// here we have selected (4 GiB - 1 KiB) as replacement for (4 GiB) MEM_SIZE.
const UInt32 kPpmd_Default_4g = (UInt32)0 - ((UInt32)1 << 10);
UInt32 v;
if (prop.vt == VT_UI8)
{
// 21.03 : we support 64-bit values (for 4 GiB value)
const UInt64 v64 = prop.uhVal.QuadPart;
if (v64 > ((UInt64)1 << 32))
return E_INVALIDARG;
if (v64 == ((UInt64)1 << 32))
v = kPpmd_Default_4g;
else
v = (UInt32)v64;
}
else if (prop.vt == VT_UI4)
v = (UInt32)prop.ulVal;
else
return E_INVALIDARG;
if (v > PPMD7_MAX_MEM_SIZE)
v = kPpmd_Default_4g;
/* here we restrict MEM_SIZE for Encoder.
It's for better performance of encoding and decoding.
The Decoder still supports more MEM_SIZE values. */
if (v < ((UInt32)1 << 16) || (v & 3) != 0)
return E_INVALIDARG;
// if (v < PPMD7_MIN_MEM_SIZE) return E_INVALIDARG; // (1 << 11)
/*
Supported MEM_SIZE range :
[ (1 << 11) , 0xFFFFFFFF - 12 * 3 ] - current 7-Zip's Ppmd7 constants
[ 1824 , 0xFFFFFFFF ] - real limits of Ppmd7 code
*/
props.MemSize = v;
continue;
}
if (prop.vt != VT_UI4)
return E_INVALIDARG;
const UInt32 v = (UInt32)prop.ulVal;
switch (propID)
{
case NCoderPropID::kOrder:
if (v < 2 || v > 32)
return E_INVALIDARG;
props.Order = (Byte)v;
break;
case NCoderPropID::kNumThreads: break;
case NCoderPropID::kLevel: level = (int)v; break;
default: return E_INVALIDARG;
}
}
props.Normalize(level);
_props = props;
return S_OK;
}
Z7_COM7F_IMF(CEncoder::WriteCoderProperties(ISequentialOutStream *outStream))
{
const UInt32 kPropSize = 5;
Byte props[kPropSize];
props[0] = (Byte)_props.Order;
SetUi32(props + 1, _props.MemSize)
return WriteStream(outStream, props, kPropSize);
}
Z7_COM7F_IMF(CEncoder::Code(ISequentialInStream *inStream, ISequentialOutStream *outStream,
const UInt64 * /* inSize */, const UInt64 * /* outSize */, ICompressProgressInfo *progress))
{
if (!_inBuf)
{
_inBuf = (Byte *)::MidAlloc(kBufSize);
if (!_inBuf)
return E_OUTOFMEMORY;
}
if (!_outStream.Alloc(1 << 20))
return E_OUTOFMEMORY;
if (!Ppmd7_Alloc(&_ppmd, _props.MemSize, &g_BigAlloc))
return E_OUTOFMEMORY;
_outStream.Stream = outStream;
_outStream.Init();
Ppmd7z_Init_RangeEnc(&_ppmd);
Ppmd7_Init(&_ppmd, (unsigned)_props.Order);
UInt64 processed = 0;
for (;;)
{
UInt32 size;
RINOK(inStream->Read(_inBuf, kBufSize, &size))
if (size == 0)
{
// We don't write EndMark in PPMD-7z.
// Ppmd7z_EncodeSymbol(&_ppmd, -1);
Ppmd7z_Flush_RangeEnc(&_ppmd);
return _outStream.Flush();
}
const Byte *buf = _inBuf;
const Byte *lim = buf + size;
/*
for (; buf < lim; buf++)
{
Ppmd7z_EncodeSymbol(&_ppmd, *buf);
RINOK(_outStream.Res);
}
*/
Ppmd7z_EncodeSymbols(&_ppmd, buf, lim);
RINOK(_outStream.Res)
processed += size;
if (progress)
{
const UInt64 outSize = _outStream.GetProcessed();
RINOK(progress->SetRatioInfo(&processed, &outSize))
}
}
}
}}
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