3.13

2025-12-12 20:11:34 -06:00 · 2003-12-11 00:00:00 +00:00
commit 8c1b5c7b7e
982 changed files with 118799 additions and 0 deletions
--- a/7zip/Archive/GZip/GZipIn.cpp
+++ b/7zip/Archive/GZip/GZipIn.cpp
@@ -0,0 +1,132 @@
+// Archive/GZipIn.cpp
+
+#include "StdAfx.h"
+
+#include "GZipIn.h"
+
+#include "Common/Defs.h"
+#include "Common/MyCom.h"
+#include "Windows/Defs.h"
+
+namespace NArchive {
+namespace NGZip {
+ 
+HRESULT CInArchive::ReadBytes(IInStream *inStream, void *data, UINT32 size)
+{
+  UINT32 realProcessedSize;
+  RINOK(inStream->Read(data, size, &realProcessedSize));
+  m_Position += realProcessedSize;
+  if(realProcessedSize != size)
+    return S_FALSE;
+  return S_OK;
+}
+
+HRESULT CInArchive::UpdateCRCBytes(IInStream *inStream, 
+    UINT32 numBytesToSkeep, CCRC &crc)
+{
+  while (numBytesToSkeep > 0)
+  {
+    const UINT32 kBufferSize = (1 << 12);
+    BYTE buffer[kBufferSize];
+    UINT32 currentSize = MyMin(numBytesToSkeep, kBufferSize);
+    RINOK(ReadBytes(inStream, buffer, currentSize));
+    crc.Update(buffer, currentSize);
+    numBytesToSkeep -= currentSize;
+  }
+  return S_OK;
+}
+
+HRESULT CInArchive::ReadZeroTerminatedString(IInStream *inStream, AString &resString)
+{
+  resString.Empty();
+  while(true)
+  {
+    char c;
+    RINOK(ReadBytes(inStream, &c, sizeof(c)));
+    if (c == 0)
+      return S_OK;
+    resString += c;
+  }
+}
+
+HRESULT CInArchive::ReadHeader(IInStream *inStream, CItemEx &item)
+{
+  RINOK(inStream->Seek(0, STREAM_SEEK_CUR, &m_StreamStartPosition));
+
+  m_Position = m_StreamStartPosition;
+  NFileHeader::CBlock fileHeader;
+
+  RINOK(ReadBytes(inStream, &fileHeader, sizeof(fileHeader)));
+
+  if (fileHeader.Id != kSignature)
+    return S_FALSE;
+
+  item.CompressionMethod = fileHeader.CompressionMethod;
+  item.Flags = fileHeader.Flags;
+  item.Time = fileHeader.Time;
+  item.ExtraFlags = fileHeader.ExtraFlags;
+  item.HostOS = fileHeader.HostOS;
+
+  CCRC crc;
+  crc.Update(&fileHeader, sizeof(fileHeader));
+  if (item.ExtraFieldIsPresent())
+  {
+    item.ExtraPosition = m_Position;
+    RINOK(ReadBytes(inStream, &item.ExtraFieldSize, 
+        sizeof(item.ExtraFieldSize)));
+    crc.Update(&item.ExtraFieldSize, sizeof(item.ExtraFieldSize));
+    RINOK(UpdateCRCBytes(inStream, item.ExtraFieldSize, crc));
+  }
+  item.Name.Empty();
+  if (item.NameIsPresent())
+    RINOK(ReadZeroTerminatedString(inStream, item.Name));
+  AString comment;
+  if (item.CommentIsPresent())
+  {
+    item.CommentPosition = m_Position;
+    RINOK(ReadZeroTerminatedString(inStream, comment));
+    item.CommentSize = comment.Length() + 1;
+  }
+  if (item.HeaderCRCIsPresent())
+  {
+    UINT16 headerCRC;
+    RINOK(ReadBytes(inStream, &headerCRC, sizeof(headerCRC)));
+    if (item.NameIsPresent())
+    {
+      crc.Update((const char *)item.Name, item.Name.Length());
+      BYTE zeroByte = 0;;
+      crc.Update(&zeroByte, sizeof(zeroByte));
+    }
+    if (item.CommentIsPresent())
+    {
+      crc.Update((const char *)comment, comment.Length());
+      BYTE zeroByte = 0;;
+      crc.Update(&zeroByte, sizeof(zeroByte));
+    }
+    if ((UINT16)crc.GetDigest() != headerCRC)
+      return S_FALSE;
+  }
+
+  item.DataPosition = m_Position;
+
+  item.UnPackSize32 = 0;
+  item.PackSize = 0;
+
+  /*
+  UINT64 newPosition;
+  RINOK(inStream->Seek(-8, STREAM_SEEK_END, &newPosition));
+  item.PackSize = newPosition - item.DataPosition;
+
+  RINOK(ReadBytes(inStream, &item.FileCRC, sizeof(item.FileCRC)));
+  RINOK(ReadBytes(inStream, &item.UnPackSize32, sizeof(item.UnPackSize32)));
+  */
+  return S_OK;
+}
+
+HRESULT CInArchive::ReadPostInfo(IInStream *inStream, UINT32 &crc, UINT32 &unpackSize32)
+{
+  RINOK(ReadBytes(inStream, &crc, sizeof(crc)));
+  return ReadBytes(inStream, &unpackSize32, sizeof(unpackSize32));
+}
+
+}}