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/*
* Copyright (C) 2008, OctaneSnail <os@v12pwr.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <windows.h>
#include <streams.h>
#include "rar.h"
#include "utils.h"
#define READ_ITEM(item) READ_ITEM2(&item, sizeof(item))
#define READ_ITEM2(item, size) { \
if (!ReadFile (file, item, size, &read, NULL)) \
{ \
ErrorMsg (GetLastError (), L"Could not read RAR header"); \
return S_FALSE; \
} \
if (read < size) return ERROR_HANDLE_EOF; \
acc += read; }
DWORD ReadHeader (HANDLE file, rar_header_t *dest)
{
fixed_header_t fh;
fixed_file_header_t ffh;
DWORD read, dword;
LONGLONG acc = 0;
// Read fixed archive header.
READ_ITEM (fh);
dest->ch.crc = fh.crc;
dest->ch.flags = fh.flags;
dest->ch.type = fh.type;
switch (fh.type)
{
case HEADER_TYPE_FILE:
READ_ITEM (ffh);
dest->ch.size.QuadPart = (LONGLONG) ffh.packedSize + fh.size;
dest->fh.size.LowPart = ffh.size;
dest->fh.os = ffh.os;
dest->fh.crc = ffh.crc;
dest->fh.timestamp = ffh.timestamp;
dest->fh.version = ffh.version;
dest->fh.method = ffh.method;
dest->fh.name_len = ffh.name_len;
dest->fh.attributes = ffh.attributes;
if (fh.flags & LHD_LARGE)
{
READ_ITEM (dword); // Packed size high dword
dest->ch.size.HighPart += dword;
READ_ITEM (dword); // Unpacked size high dword
dest->fh.size.HighPart = dword;
}
else
dest->fh.size.HighPart = 0;
dest->fh.filename = new char [dest->fh.name_len + 1];
if (!dest->fh.filename)
{
ErrorMsg (0, L"Out of memory while reading RAR header.");
return ERROR_OUTOFMEMORY;
}
READ_ITEM2 (dest->fh.filename, dest->fh.name_len);
dest->fh.filename [dest->fh.name_len] = 0;
if (fh.flags & LHD_SALT)
READ_ITEM2 (dest->fh.salt, 8);
if (fh.flags & LHD_EXTTIME)
{
WORD flags;
READ_ITEM (flags);
for (int i= 0 ; i < 4; i++)
{
DWORD rmode = flags >> (3 - i) * 4;
if (!(rmode & 8))
continue;
if (i != 0)
{
DWORD dosTime;
READ_ITEM (dosTime);
}
int count = rmode & 3;
for (int j = 0; j < count; j++)
{
BYTE byte;
READ_ITEM (byte);
}
}
}
break;
default:
if (fh.flags & LONG_BLOCK)
{
READ_ITEM (dword);
dest->ch.size.QuadPart = (LONGLONG) dword + fh.size;
}
else
{
dest->ch.size.HighPart = 0;
dest->ch.size.LowPart = fh.size;
}
}
if (acc > dest->ch.size.QuadPart)
{
ErrorMsg (0, L"Overrun while reading RAR header.");
return S_FALSE;
}
if (fh.type != HEADER_TYPE_FILE && acc < dest->ch.size.QuadPart)
{
LARGE_INTEGER li;
li.QuadPart = dest->ch.size.QuadPart - acc;
SetFilePointerEx (file, li, NULL, FILE_CURRENT);
dest->bytesRemaining.QuadPart = 0;
}
else
dest->bytesRemaining.QuadPart = dest->ch.size.QuadPart - acc;
return ERROR_SUCCESS;
}
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