mirror of
https://github.com/Xevion/easy7zip.git
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123 lines
2.8 KiB
C++
Executable File
123 lines
2.8 KiB
C++
Executable File
// Archive/GZipIn.cpp
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#include "StdAfx.h"
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#include "GZipIn.h"
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#include "Common/Defs.h"
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#include "Common/MyCom.h"
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#include "Windows/Defs.h"
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#include "../../Common/StreamUtils.h"
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extern "C"
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{
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#include "../../../../C/7zCrc.h"
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}
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namespace NArchive {
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namespace NGZip {
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HRESULT CInArchive::ReadBytes(ISequentialInStream *inStream, void *data, UInt32 size)
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{
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UInt32 realProcessedSize;
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RINOK(ReadStream(inStream, data, size, &realProcessedSize));
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m_Position += realProcessedSize;
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if(realProcessedSize != size)
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return S_FALSE;
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return S_OK;
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}
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HRESULT CInArchive::ReadByte(ISequentialInStream *inStream, Byte &value, UInt32 &crc)
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{
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HRESULT res = ReadBytes(inStream, &value, 1);
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crc = CRC_UPDATE_BYTE(crc, value);
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return res;
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}
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HRESULT CInArchive::ReadUInt16(ISequentialInStream *inStream, UInt16 &value, UInt32 &crc)
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{
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value = 0;
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for (int i = 0; i < 2; i++)
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{
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Byte b;
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RINOK(ReadByte(inStream, b, crc));
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value |= (UInt16(b) << (8 * i));
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}
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return S_OK;
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}
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HRESULT CInArchive::ReadUInt32(ISequentialInStream *inStream, UInt32 &value, UInt32 &crc)
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{
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value = 0;
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for (int i = 0; i < 4; i++)
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{
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Byte b;
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RINOK(ReadByte(inStream, b, crc));
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value |= (UInt32(b) << (8 * i));
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}
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return S_OK;
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}
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HRESULT CInArchive::ReadZeroTerminatedString(ISequentialInStream *inStream, AString &resString, UInt32 &crc)
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{
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resString.Empty();
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for (;;)
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{
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Byte c;
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RINOK(ReadByte(inStream, c, crc));
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if (c == 0)
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return S_OK;
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resString += char(c);
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}
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}
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HRESULT CInArchive::ReadHeader(ISequentialInStream *inStream, CItem &item)
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{
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item.Clear();
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m_Position = 0;
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UInt16 signature;
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UInt32 crc = CRC_INIT_VAL;;
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RINOK(ReadUInt16(inStream, signature, crc));
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if (signature != kSignature)
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return S_FALSE;
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RINOK(ReadByte(inStream, item.CompressionMethod, crc));
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RINOK(ReadByte(inStream, item.Flags, crc));
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RINOK(ReadUInt32(inStream, item.Time, crc));
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RINOK(ReadByte(inStream, item.ExtraFlags, crc));
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RINOK(ReadByte(inStream, item.HostOS, crc));
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if (item.ExtraFieldIsPresent())
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{
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UInt16 extraSize;
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RINOK(ReadUInt16(inStream, extraSize, crc));
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item.Extra.SetCapacity(extraSize);
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RINOK(ReadBytes(inStream, item.Extra, extraSize));
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crc = CrcUpdate(crc, item.Extra, extraSize);
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}
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if (item.NameIsPresent())
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RINOK(ReadZeroTerminatedString(inStream, item.Name, crc));
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if (item.CommentIsPresent())
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RINOK(ReadZeroTerminatedString(inStream, item.Comment, crc));
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if (item.HeaderCRCIsPresent())
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{
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UInt16 headerCRC;
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UInt32 dummy = 0;
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RINOK(ReadUInt16(inStream, headerCRC, dummy));
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if ((UInt16)CRC_GET_DIGEST(crc) != headerCRC)
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return S_FALSE;
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}
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return S_OK;
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}
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HRESULT CInArchive::ReadPostHeader(ISequentialInStream *inStream, CItem &item)
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{
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UInt32 dummy = 0;
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RINOK(ReadUInt32(inStream, item.FileCRC, dummy));
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return ReadUInt32(inStream, item.UnPackSize32, dummy);
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}
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}}
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