reactos/sdk/lib/cmlib/hivebin.c

/*
 * PROJECT:   Registry manipulation library
 * LICENSE:   GPL - See COPYING in the top level directory
 * COPYRIGHT: Copyright 2005 Filip Navara <navaraf@reactos.org>
 *            Copyright 2005 Hartmut Birr
 *            Copyright 2001 - 2005 Eric Kohl
 */

#include "cmlib.h"

PHBIN CMAPI
HvpAddBin(
    PHHIVE RegistryHive,
    ULONG Size,
    HSTORAGE_TYPE Storage)
{
    PHMAP_ENTRY BlockList;
    PHBIN Bin;
    ULONG BinSize;
    ULONG i;
    ULONG BitmapSize;
    ULONG BlockCount;
    ULONG OldBlockListSize;
    PHCELL Block;

    BinSize = ROUND_UP(Size + sizeof(HBIN), HBLOCK_SIZE);
    BlockCount = BinSize / HBLOCK_SIZE;

    Bin = RegistryHive->Allocate(BinSize, TRUE, TAG_CM);
    if (Bin == NULL)
        return NULL;
    RtlZeroMemory(Bin, BinSize);

    Bin->Signature = HV_HBIN_SIGNATURE;
    Bin->FileOffset = RegistryHive->Storage[Storage].Length *
                      HBLOCK_SIZE;
    Bin->Size = BinSize;

    /* Allocate new block list */
    OldBlockListSize = RegistryHive->Storage[Storage].Length;
    BlockList = RegistryHive->Allocate(sizeof(HMAP_ENTRY) *
                                       (OldBlockListSize + BlockCount),
                                       TRUE,
                                       TAG_CM);
    if (BlockList == NULL)
    {
        RegistryHive->Free(Bin, 0);
        return NULL;
    }

    if (OldBlockListSize > 0)
    {
        RtlCopyMemory(BlockList, RegistryHive->Storage[Storage].BlockList,
                      OldBlockListSize * sizeof(HMAP_ENTRY));
        RegistryHive->Free(RegistryHive->Storage[Storage].BlockList, 0);
    }

    RegistryHive->Storage[Storage].BlockList = BlockList;
    RegistryHive->Storage[Storage].Length += BlockCount;

    for (i = 0; i < BlockCount; i++)
    {
        RegistryHive->Storage[Storage].BlockList[OldBlockListSize + i].BlockAddress =
            ((ULONG_PTR)Bin + (i * HBLOCK_SIZE));
        RegistryHive->Storage[Storage].BlockList[OldBlockListSize + i].BinAddress = (ULONG_PTR)Bin;
    }

    /* Initialize a free block in this heap. */
    Block = (PHCELL)(Bin + 1);
    Block->Size = (LONG)(BinSize - sizeof(HBIN));

    if (Storage == Stable)
    {
        /* Calculate bitmap size in bytes (always a multiple of 32 bits). */
        BitmapSize = ROUND_UP(RegistryHive->Storage[Stable].Length,
                              sizeof(ULONG) * 8) / 8;

        /* Grow bitmap if necessary. */
        if (BitmapSize > RegistryHive->DirtyVector.SizeOfBitMap / 8)
        {
            PULONG BitmapBuffer;

            BitmapBuffer = RegistryHive->Allocate(BitmapSize, TRUE, TAG_CM);
            RtlZeroMemory(BitmapBuffer, BitmapSize);
            if (RegistryHive->DirtyVector.SizeOfBitMap > 0)
            {
                ASSERT(RegistryHive->DirtyVector.Buffer);
                RtlCopyMemory(BitmapBuffer,
                              RegistryHive->DirtyVector.Buffer,
                              RegistryHive->DirtyVector.SizeOfBitMap / 8);
                RegistryHive->Free(RegistryHive->DirtyVector.Buffer, 0);
            }
            RtlInitializeBitMap(&RegistryHive->DirtyVector, BitmapBuffer,
                                BitmapSize * 8);
        }

        /* Mark new bin dirty. */
        RtlSetBits(&RegistryHive->DirtyVector,
                   Bin->FileOffset / HBLOCK_SIZE,
                   BlockCount);

        /* Update size in the base block */
        RegistryHive->BaseBlock->Length += BinSize;
    }

    return Bin;
}