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// TarOut.cpp
#include "StdAfx.h"
#include "../../Common/StreamUtils.h"
#include "TarOut.h"
namespace NArchive {
namespace NTar {
HRESULT COutArchive::WriteBytes(const void *data, unsigned size)
{
Pos += size;
return WriteStream(m_Stream, data, size);
}
static void MyStrNCpy(char *dest, const char *src, unsigned size)
{
for (unsigned i = 0; i < size; i++)
{
char c = src[i];
dest[i] = c;
if (c == 0)
break;
}
}
static bool WriteOctal_8(char *s, UInt32 val)
{
const unsigned kNumDigits = 8 - 1;
if (val >= ((UInt32)1 << (kNumDigits * 3)))
return false;
for (unsigned i = 0; i < kNumDigits; i++)
{
s[kNumDigits - 1 - i] = (char)('0' + (val & 7));
val >>= 3;
}
return true;
}
static void WriteOctal_12(char *s, UInt64 val)
{
const unsigned kNumDigits = 12 - 1;
if (val >= ((UInt64)1 << (kNumDigits * 3)))
{
// GNU extension;
s[0] = (char)(Byte)0x80;
s[1] = s[2] = s[3] = 0;
for (unsigned i = 0; i < 8; i++, val <<= 8)
s[4 + i] = (char)(val >> 56);
return;
}
for (unsigned i = 0; i < kNumDigits; i++)
{
s[kNumDigits - 1 - i] = (char)('0' + (val & 7));
val >>= 3;
}
}
static void WriteOctal_12_Signed(char *s, Int64 val)
{
if (val >= 0)
{
WriteOctal_12(s, val);
return;
}
s[0] = s[1] = s[2] = s[3] = (char)(Byte)0xFF;
for (unsigned i = 0; i < 8; i++, val <<= 8)
s[4 + i] = (char)(val >> 56);
}
static bool CopyString(char *dest, const AString &src, unsigned maxSize)
{
if (src.Len() >= maxSize)
return false;
MyStringCopy(dest, (const char *)src);
return true;
}
#define RETURN_IF_NOT_TRUE(x) { if (!(x)) return E_FAIL; }
HRESULT COutArchive::WriteHeaderReal(const CItem &item)
{
char record[NFileHeader::kRecordSize];
memset(record, 0, NFileHeader::kRecordSize);
char *cur = record;
if (item.Name.Len() > NFileHeader::kNameSize)
return E_FAIL;
MyStrNCpy(cur, item.Name, NFileHeader::kNameSize);
cur += NFileHeader::kNameSize;
RETURN_IF_NOT_TRUE(WriteOctal_8(cur, item.Mode)); cur += 8;
RETURN_IF_NOT_TRUE(WriteOctal_8(cur, item.UID)); cur += 8;
RETURN_IF_NOT_TRUE(WriteOctal_8(cur, item.GID)); cur += 8;
WriteOctal_12(cur, item.PackSize); cur += 12;
WriteOctal_12_Signed(cur, item.MTime); cur += 12;
memset(cur, ' ', 8);
cur += 8;
*cur++ = item.LinkFlag;
RETURN_IF_NOT_TRUE(CopyString(cur, item.LinkName, NFileHeader::kNameSize));
cur += NFileHeader::kNameSize;
memcpy(cur, item.Magic, 8);
cur += 8;
RETURN_IF_NOT_TRUE(CopyString(cur, item.User, NFileHeader::kUserNameSize));
cur += NFileHeader::kUserNameSize;
RETURN_IF_NOT_TRUE(CopyString(cur, item.Group, NFileHeader::kGroupNameSize));
cur += NFileHeader::kGroupNameSize;
if (item.DeviceMajorDefined) RETURN_IF_NOT_TRUE(WriteOctal_8(cur, item.DeviceMajor)); cur += 8;
if (item.DeviceMinorDefined) RETURN_IF_NOT_TRUE(WriteOctal_8(cur, item.DeviceMinor)); cur += 8;
if (item.IsSparse())
{
record[482] = (char)(item.SparseBlocks.Size() > 4 ? 1 : 0);
WriteOctal_12(record + 483, item.Size);
for (unsigned i = 0; i < item.SparseBlocks.Size() && i < 4; i++)
{
const CSparseBlock &sb = item.SparseBlocks[i];
char *p = record + 386 + 24 * i;
WriteOctal_12(p, sb.Offset);
WriteOctal_12(p + 12, sb.Size);
}
}
{
UInt32 checkSum = 0;
{
for (unsigned i = 0; i < NFileHeader::kRecordSize; i++)
checkSum += (Byte)record[i];
}
/* we use GNU TAR scheme:
checksum field is formatted differently from the
other fields: it has [6] digits, a null, then a space. */
// RETURN_IF_NOT_TRUE(WriteOctal_8(record + 148, checkSum));
const unsigned kNumDigits = 6;
for (unsigned i = 0; i < kNumDigits; i++)
{
record[148 + kNumDigits - 1 - i] = (char)('0' + (checkSum & 7));
checkSum >>= 3;
}
record[148 + 6] = 0;
}
RINOK(WriteBytes(record, NFileHeader::kRecordSize));
if (item.IsSparse())
{
for (unsigned i = 4; i < item.SparseBlocks.Size();)
{
memset(record, 0, NFileHeader::kRecordSize);
for (unsigned t = 0; t < 21 && i < item.SparseBlocks.Size(); t++, i++)
{
const CSparseBlock &sb = item.SparseBlocks[i];
char *p = record + 24 * t;
WriteOctal_12(p, sb.Offset);
WriteOctal_12(p + 12, sb.Size);
}
record[21 * 24] = (char)(i < item.SparseBlocks.Size() ? 1 : 0);
RINOK(WriteBytes(record, NFileHeader::kRecordSize));
}
}
return S_OK;
}
HRESULT COutArchive::WriteHeader(const CItem &item)
{
unsigned nameSize = item.Name.Len();
unsigned linkSize = item.LinkName.Len();
/* There two versions of GNU tar:
OLDGNU_FORMAT: it writes short name and zero at the end
GNU_FORMAT: it writes only short name without zero at the end
we write it as OLDGNU_FORMAT with zero at the end */
if (nameSize < NFileHeader::kNameSize &&
linkSize < NFileHeader::kNameSize)
return WriteHeaderReal(item);
CItem mi = item;
mi.Name = NFileHeader::kLongLink;
mi.LinkName.Empty();
for (int i = 0; i < 2; i++)
{
const AString *name;
// We suppose that GNU tar also writes item for long link before item for LongName?
if (i == 0)
{
mi.LinkFlag = NFileHeader::NLinkFlag::kGnu_LongLink;
name = &item.LinkName;
}
else
{
mi.LinkFlag = NFileHeader::NLinkFlag::kGnu_LongName;
name = &item.Name;
}
if (name->Len() < NFileHeader::kNameSize)
continue;
unsigned nameStreamSize = name->Len() + 1;
mi.PackSize = nameStreamSize;
RINOK(WriteHeaderReal(mi));
RINOK(WriteBytes((const char *)*name, nameStreamSize));
RINOK(FillDataResidual(nameStreamSize));
}
mi = item;
if (mi.Name.Len() >= NFileHeader::kNameSize)
mi.Name.SetFrom(item.Name, NFileHeader::kNameSize - 1);
if (mi.LinkName.Len() >= NFileHeader::kNameSize)
mi.LinkName.SetFrom(item.LinkName, NFileHeader::kNameSize - 1);
return WriteHeaderReal(mi);
}
HRESULT COutArchive::FillDataResidual(UInt64 dataSize)
{
unsigned lastRecordSize = ((unsigned)dataSize & (NFileHeader::kRecordSize - 1));
if (lastRecordSize == 0)
return S_OK;
unsigned rem = NFileHeader::kRecordSize - lastRecordSize;
Byte buf[NFileHeader::kRecordSize];
memset(buf, 0, rem);
return WriteBytes(buf, rem);
}
HRESULT COutArchive::WriteFinishHeader()
{
Byte record[NFileHeader::kRecordSize];
memset(record, 0, NFileHeader::kRecordSize);
for (unsigned i = 0; i < 2; i++)
{
RINOK(WriteBytes(record, NFileHeader::kRecordSize));
}
return S_OK;
}
}}
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