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// Archive/LzhIn.cpp
#include "StdAfx.h"
#include "Common/StringConvert.h"
#include "Common/Buffer.h"
#include "../../Common/StreamUtils.h"
#include "LzhIn.h"
namespace NArchive {
namespace NLzh {
HRESULT CInArchive::ReadBytes(void *data, UInt32 size, UInt32 &processedSize)
{
size_t realProcessedSize = size;
RINOK(ReadStream(m_Stream, data, &realProcessedSize));
processedSize = (UInt32)realProcessedSize;
m_Position += processedSize;
return S_OK;
}
HRESULT CInArchive::CheckReadBytes(void *data, UInt32 size)
{
UInt32 processedSize;
RINOK(ReadBytes(data, size, processedSize));
return (processedSize == size) ? S_OK: S_FALSE;
}
HRESULT CInArchive::Open(IInStream *inStream)
{
RINOK(inStream->Seek(0, STREAM_SEEK_CUR, &m_Position));
m_Stream = inStream;
return S_OK;
}
static const Byte *ReadUInt32(const Byte *p, UInt32 &v)
{
v = 0;
for (int i = 0; i < 4; i++)
v |= ((UInt32)(*p++) << (i * 8));
return p;
}
static const Byte *ReadUInt16(const Byte *p, UInt16 &v)
{
v = 0;
for (int i = 0; i < 2; i++)
v |= ((UInt16)(*p++) << (i * 8));
return p;
}
static const Byte *ReadString(const Byte *p, size_t size, AString &s)
{
s.Empty();
for (size_t i = 0; i < size; i++)
{
char c = p[i];
if (c == 0)
break;
s += c;
}
return p + size;
}
static Byte CalcSum(const Byte *data, size_t size)
{
Byte sum = 0;
for (size_t i = 0; i < size; i++)
sum = (Byte)(sum + data[i]);
return sum;
}
HRESULT CInArchive::GetNextItem(bool &filled, CItemEx &item)
{
filled = false;
UInt32 processedSize;
Byte startHeader[2];
RINOK(ReadBytes(startHeader, 2, processedSize))
if (processedSize == 0)
return S_OK;
if (processedSize == 1)
return (startHeader[0] == 0) ? S_OK: S_FALSE;
if (startHeader[0] == 0 && startHeader[1] == 0)
return S_OK;
Byte header[256];
const UInt32 kBasicPartSize = 22;
RINOK(ReadBytes(header, kBasicPartSize, processedSize));
if (processedSize != kBasicPartSize)
return (startHeader[0] == 0) ? S_OK: S_FALSE;
const Byte *p = header;
memmove(item.Method, p, kMethodIdSize);
if (!item.IsValidMethod())
return S_OK;
p += kMethodIdSize;
p = ReadUInt32(p, item.PackSize);
p = ReadUInt32(p, item.Size);
p = ReadUInt32(p, item.ModifiedTime);
item.Attributes = *p++;
item.Level = *p++;
if (item.Level > 2)
return S_FALSE;
UInt32 headerSize;
if (item.Level < 2)
{
headerSize = startHeader[0];
if (headerSize < kBasicPartSize)
return S_FALSE;
UInt32 remain = headerSize - kBasicPartSize;
RINOK(CheckReadBytes(header + kBasicPartSize, remain));
if (startHeader[1] != CalcSum(header, headerSize))
return S_FALSE;
size_t nameLength = *p++;
if ((p - header) + nameLength + 2 > headerSize)
return S_FALSE;
p = ReadString(p, nameLength, item.Name);
}
else
headerSize = startHeader[0] | ((UInt32)startHeader[1] << 8);
p = ReadUInt16(p, item.CRC);
if (item.Level != 0)
{
if (item.Level == 2)
{
RINOK(CheckReadBytes(header + kBasicPartSize, 2));
}
if ((size_t)(p - header) + 3 > headerSize)
return S_FALSE;
item.OsId = *p++;
UInt16 nextSize;
p = ReadUInt16(p, nextSize);
while (nextSize != 0)
{
if (nextSize < 3)
return S_FALSE;
if (item.Level == 1)
{
if (item.PackSize < nextSize)
return S_FALSE;
item.PackSize -= nextSize;
}
CExtension ext;
RINOK(CheckReadBytes(&ext.Type, 1))
nextSize -= 3;
ext.Data.SetCapacity(nextSize);
RINOK(CheckReadBytes((Byte *)ext.Data, nextSize))
item.Extensions.Add(ext);
Byte hdr2[2];
RINOK(CheckReadBytes(hdr2, 2));
ReadUInt16(hdr2, nextSize);
}
}
item.DataPosition = m_Position;
filled = true;
return S_OK;
}
HRESULT CInArchive::Skeep(UInt64 numBytes)
{
UInt64 newPostion;
RINOK(m_Stream->Seek(numBytes, STREAM_SEEK_CUR, &newPostion));
m_Position += numBytes;
if (m_Position != newPostion)
return E_FAIL;
return S_OK;
}
}}
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