flatbuf.c File Reference

#include "precomp.h"

Include dependency graph for flatbuf.c:

Go to the source code of this file.

Functions
VOID WINAPI	FlatBuf_Init (IN PFLATBUFF FlatBuffer, IN PVOID Buffer, IN SIZE_T Size)
PVOID WINAPI	FlatBuf_Arg_Reserve (IN OUT PULONG_PTR Position, IN OUT PSIZE_T FreeSize, IN SIZE_T Size, IN ULONG Align)
PVOID WINAPI	FlatBuf_Arg_CopyMemory (IN OUT PULONG_PTR Position, IN OUT PSIZE_T FreeSize, IN PVOID Buffer, IN SIZE_T Size, IN ULONG Align)
PVOID WINAPI	FlatBuf_Arg_WriteString (IN OUT PULONG_PTR Position, IN OUT PSIZE_T FreeSize, IN PVOID String, IN BOOLEAN IsUnicode)

Function Documentation

FlatBuf_Arg_CopyMemory()

PVOID WINAPI FlatBuf_Arg_CopyMemory	(	IN OUT PULONG_PTR	Position,
		IN OUT PSIZE_T	FreeSize,
		IN PVOID	Buffer,
		IN SIZE_T	Size,
		IN ULONG	Align
	)

Definition at line 60 of file flatbuf.c.

{
    PVOID Destination;
 
    /* First reserve the memory */
    Destination = FlatBuf_Arg_Reserve(Position, FreeSize, Size, Align);
    if (Destination)
    {
        /* We have space, do the copy */
        RtlCopyMemory(Destination, Buffer, Size);
    }
 
    /* Return the pointer to the data */
    return Destination;
}

FlatBuf_Arg_Reserve()

PVOID WINAPI FlatBuf_Arg_Reserve	(	IN OUT PULONG_PTR	Position,
		IN OUT PSIZE_T	FreeSize,
		IN SIZE_T	Size,
		IN ULONG	Align
	)

Definition at line 32 of file flatbuf.c.

{
    ULONG_PTR NewPosition, OldPosition = *Position;
    SIZE_T NewFreeSize = *FreeSize;
 
    /* Start by aligning our position */
    if (Align) OldPosition += (Align - 1) & ~Align;
 
    /* Update it */
    NewPosition = OldPosition + Size;
 
    /* Update Free Size */
    NewFreeSize += (OldPosition - NewPosition);
 
    /* Save new values */
    *Position = NewPosition;
    *FreeSize = NewFreeSize;
 
    /* Check if we're out of space or not */
    if (NewFreeSize > 0) return (PVOID)OldPosition;
    return NULL;
}

Referenced by FlatBuf_Arg_CopyMemory(), FlatBuf_Arg_ReserveAlignPointer(), and FlatBuf_Arg_WriteString().

FlatBuf_Arg_WriteString()

PVOID WINAPI FlatBuf_Arg_WriteString	(	IN OUT PULONG_PTR	Position,
		IN OUT PSIZE_T	FreeSize,
		IN PVOID	String,
		IN BOOLEAN	IsUnicode
	)

Definition at line 82 of file flatbuf.c.

{
    PVOID Destination;
    SIZE_T StringLength;
    ULONG Align;
 
    /* Calculate the string length */
    if (IsUnicode)
    {
        /* Get the length in bytes and use WCHAR alignment */
        StringLength = (wcslen((LPWSTR)String) + 1) * sizeof(WCHAR);
        Align = sizeof(WCHAR);
    }
    else
    {
        /* Get the length in bytes and use CHAR alignment */
        StringLength = strlen((LPSTR)String) + 1;
        Align = sizeof(CHAR);
    }
 
    /* Now reserve the memory */
    Destination = FlatBuf_Arg_Reserve(Position, FreeSize, StringLength, Align);
    if (Destination)
    {
        /* We have space, do the copy */
        RtlCopyMemory(Destination, String, StringLength);
    }
 
    /* Return the pointer to the data */
    return Destination;
}

FlatBuf_Init()

VOID WINAPI FlatBuf_Init	(	IN PFLATBUFF	FlatBuffer,
		IN PVOID	Buffer,
		IN SIZE_T	Size
	)

Definition at line 17 of file flatbuf.c.

{
    /* Set up the Flat Buffer start, current and ending position */
    FlatBuffer->Buffer = Buffer;
    FlatBuffer->BufferPos = (ULONG_PTR)Buffer;
    FlatBuffer->BufferEnd = (PVOID)(FlatBuffer->BufferPos + Size);
 
    /* Setup the current size and the available size */
    FlatBuffer->BufferSize = FlatBuffer->BufferFreeSize = Size;
}