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97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS DNS Shared Library
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* FILE: lib/dnslib/hostent.c
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* PURPOSE: Functions for dealing with Host Entry structures
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*/
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/* INCLUDES ******************************************************************/
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#include "precomp.h"
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/* DATA **********************************************************************/
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/* FUNCTIONS *****************************************************************/
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PHOSTENT
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WINAPI
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Hostent_Init(IN PVOID *Buffer,
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IN WORD AddressFamily,
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IN ULONG AddressSize,
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IN ULONG AddressCount,
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IN ULONG AliasCount)
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{
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PHOSTENT Hostent;
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ULONG_PTR BufferPosition = (ULONG_PTR)*Buffer;
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/* Align the hostent on the buffer's 4 byte boundary */
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BufferPosition += 3 & ~3;
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/* Set up the basic data */
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Hostent = (PHOSTENT)BufferPosition;
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Hostent->h_length = (WORD)AddressSize;
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Hostent->h_addrtype = AddressFamily;
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/* Put aliases after Hostent */
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Hostent->h_aliases = (PCHAR*)((ULONG_PTR)(Hostent + 1) & ~3);
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/* Zero it out */
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RtlZeroMemory(Hostent->h_aliases, AliasCount * sizeof(PCHAR));
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/* Put addresses after aliases */
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Hostent->h_addr_list = (PCHAR*)
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((ULONG_PTR)Hostent->h_aliases +
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(AliasCount * sizeof(PCHAR)) + sizeof(PCHAR));
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/* Update the location */
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BufferPosition = (ULONG_PTR)Hostent->h_addr_list +
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((AddressCount * sizeof(PCHAR)) + sizeof(PCHAR));
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/* Send it back */
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*Buffer = (PVOID)BufferPosition;
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/* Return the hostent */
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return Hostent;
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}
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VOID
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WINAPI
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Dns_PtrArrayToOffsetArray(PCHAR *List,
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ULONG_PTR Base)
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{
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/* Loop every pointer in the list */
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do
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{
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/* Update the pointer */
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*List = (PCHAR)((ULONG_PTR)*List - Base);
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} while(*List++);
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}
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VOID
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WINAPI
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Hostent_ConvertToOffsets(IN PHOSTENT Hostent)
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{
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/* Do we have a name? */
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if (Hostent->h_name)
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{
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/* Update it */
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Hostent->h_name -= (ULONG_PTR)Hostent;
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}
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/* Do we have aliases? */
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if (Hostent->h_aliases)
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{
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/* Update the pointer */
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Hostent->h_aliases -= (ULONG_PTR)Hostent;
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/* Fix them up */
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Dns_PtrArrayToOffsetArray(Hostent->h_aliases, (ULONG_PTR)Hostent);
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}
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/* Do we have addresses? */
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if (Hostent->h_addr_list)
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{
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/* Fix them up */
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Dns_PtrArrayToOffsetArray(Hostent->h_addr_list, (ULONG_PTR)Hostent);
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}
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}
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