tools.c

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/*
 * PROJECT:     ReactOS Spooler Router
 * LICENSE:     GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
 * PURPOSE:     Miscellaneous tool functions
 * COPYRIGHT:   Copyright 2015-2017 Colin Finck (colin@reactos.org)
 */
 
#include "precomp.h"
 
 
PBYTE WINAPI
PackStrings(PCWSTR* pSource, PBYTE pDest, const DWORD* DestOffsets, PBYTE pEnd)
{
    DWORD cbString;
    ULONG_PTR StringAddress;
 
    // Loop until we reach an element with offset set to MAXDWORD.
    while (*DestOffsets != MAXDWORD)
    {
        StringAddress = 0;
 
        if (*pSource)
        {
            // Determine the length of the source string.
            cbString = (wcslen(*pSource) + 1) * sizeof(WCHAR);
 
            // Copy it before the last string.
            pEnd -= cbString;
            StringAddress = (ULONG_PTR)pEnd;
            CopyMemory(pEnd, *pSource, cbString);
        }
 
        // Copy the address of the copied string to the location given by the offset.
        CopyMemory(&pDest[*DestOffsets], &StringAddress, sizeof(ULONG_PTR));
 
        // Advance to the next source string and destination offset.
        pSource++;
        DestOffsets++;
    }
 
    // pEnd is now at the last string we copied. Return this value as a pointer to the beginning of all strings in the output buffer.
    return pEnd;
}