public static bool UnmarshalLzxcResetTable(ref byte[] pData, ref uint pDataPos,
ref uint pDataLen, ref chmLzxcResetTable dest)
{
/* we only know how to deal with a 0x28 byte structures */
if (pDataLen != CHM_LZXC_RESETTABLE_V1_LEN)
{
return(false);
}
/* unmarshal fields */
Unmarshal.ToUInt32(ref pData, ref pDataPos, ref pDataLen, ref dest.version);
Unmarshal.ToUInt32(ref pData, ref pDataPos, ref pDataLen, ref dest.block_count);
Unmarshal.ToUInt32(ref pData, ref pDataPos, ref pDataLen, ref dest.unknown);
Unmarshal.ToUInt32(ref pData, ref pDataPos, ref pDataLen, ref dest.table_offset);
Unmarshal.ToUInt64(ref pData, ref pDataPos, ref pDataLen, ref dest.uncompressed_len);
Unmarshal.ToUInt64(ref pData, ref pDataPos, ref pDataLen, ref dest.compressed_len);
Unmarshal.ToUInt64(ref pData, ref pDataPos, ref pDataLen, ref dest.block_len);
/* check structure */
if (dest.version != 2)
{
return(false);
}
return(true);
}
public static bool UnmarshalItsfHeader(ref byte[] pData, ref uint pDataPos,
ref uint pDataLen, ref chmItsfHeader dest)
{
/* we only know how to deal with the 0x58 and 0x60 byte structures */
if (pDataLen != CHM_ITSF_V2_LEN && pDataLen != CHM_ITSF_V3_LEN)
{
return(false);
}
InitialiseItsfHeader(ref dest);
/* unmarshal common fields */
Unmarshal.ToCharArray(ref pData, ref pDataPos, ref pDataLen, ref dest.signature, 4);
Unmarshal.ToInt32(ref pData, ref pDataPos, ref pDataLen, ref dest.version);
Unmarshal.ToInt32(ref pData, ref pDataPos, ref pDataLen, ref dest.header_len);
Unmarshal.ToInt32(ref pData, ref pDataPos, ref pDataLen, ref dest.unknown_000c);
Unmarshal.ToUInt32(ref pData, ref pDataPos, ref pDataLen, ref dest.last_modified);
Unmarshal.ToUInt32(ref pData, ref pDataPos, ref pDataLen, ref dest.lang_id);
Unmarshal.ToUuid(ref pData, ref pDataPos, ref pDataLen, ref dest.dir_uuid);
Unmarshal.ToUuid(ref pData, ref pDataPos, ref pDataLen, ref dest.stream_uuid);
Unmarshal.ToUInt64(ref pData, ref pDataPos, ref pDataLen, ref dest.unknown_offset);
Unmarshal.ToUInt64(ref pData, ref pDataPos, ref pDataLen, ref dest.unknown_len);
Unmarshal.ToUInt64(ref pData, ref pDataPos, ref pDataLen, ref dest.dir_offset);
Unmarshal.ToUInt64(ref pData, ref pDataPos, ref pDataLen, ref dest.dir_len);
/* error check the data */
/* XXX: should also check UUIDs, probably, though with a version 3 file,
* current MS tools do not seem to use them.
*/
if (new String(dest.signature).CompareTo("ITSF") != 0)
{
return(false);
}
if (dest.version == 2)
{
if (dest.header_len < CHM_ITSF_V2_LEN)
{
return(false);
}
}
else if (dest.version == 3)
{
if (dest.header_len < CHM_ITSF_V3_LEN)
{
return(false);
}
}
else
{
return(false);
}
/* now, if we have a V3 structure, unmarshal the rest.
* otherwise, compute it
*/
if (dest.version == 3)
{
if (pDataLen != 0)
{
Unmarshal.ToUInt64(ref pData, ref pDataPos, ref pDataLen, ref dest.data_offset);
}
else
{
return(false);
}
}
else
{
dest.data_offset = dest.dir_offset + dest.dir_len;
}
return(true);
}
/* get the bounds of a compressed block. return 0 on failure */
public static bool GetCmpBlockBounds(ref ChmFileInfo h, UInt64 block,
ref UInt64 start, ref Int64 len)
{
byte[] buffer = new byte[8];
uint remain;
uint pos = 0;
/* for all but the last block, use the reset table */
if (block < h.reset_table.block_count - 1)
{
/* unpack the start address */
pos = 0;
remain = 8;
if (Storage.FetchBytes(ref h, ref buffer,
(UInt64)h.data_offset
+ (UInt64)h.rt_unit.start
+ (UInt64)h.reset_table.table_offset
+ (UInt64)block * 8,
remain) != remain ||
!Unmarshal.ToUInt64(ref buffer, ref pos, ref remain, ref start))
{
return(false);
}
/* unpack the end address */
pos = 0;
remain = 8;
if (Storage.FetchBytes(ref h, ref buffer,
(UInt64)h.data_offset
+ (UInt64)h.rt_unit.start
+ (UInt64)h.reset_table.table_offset
+ (UInt64)block * 8 + 8,
remain) != remain ||
!Unmarshal.ToInt64(ref buffer, ref pos, ref remain, ref len))
{
return(false);
}
}
/* for the last block, use the span in addition to the reset table */
else
{
/* unpack the start address */
pos = 0;
remain = 8;
if (Storage.FetchBytes(ref h, ref buffer,
(UInt64)h.data_offset
+ (UInt64)h.rt_unit.start
+ (UInt64)h.reset_table.table_offset
+ (UInt64)block * 8,
remain) != remain ||
!Unmarshal.ToUInt64(ref buffer, ref pos, ref remain, ref start))
{
return(false);
}
len = (Int64)h.reset_table.compressed_len;
}
/* compute the length and absolute start address */
len -= (Int64)start;
start += h.data_offset + h.cn_unit.start;
return(true);
}
