Why QDBMP fail to write 128*128 images? - c++

Question

I am developing a c++ application that reads some bitmap and work with them and then save them as bitmap . I use QDBMP library for working with bitmap file and every thing is good for 512*512 bitmap images . but when working with 128*128 bitmap files it just write some striped line in output . here is my code for reading and writing bitmap files :
int readBitmapImage(const char *file_name,UCHAR* r, UCHAR* g, UCHAR* b)
{
BMP* bmp;
UINT width, height;
bmp = BMP_ReadFile(file_name);
BMP_GetDepth(bmp);
BMP_CHECK_ERROR(stderr, -1);
width = BMP_GetWidth(bmp); height = BMP_GetHeight(bmp);
for (int x = 0; x < width; ++x)
{
for (int y = 0; y < height; ++y)
{
BMP_GetPixelRGB(bmp, x, y, &r[x*width+y], &g[x*width + y], &b[x*width + y]);
}
}
BMP_CHECK_ERROR(stderr, -2);
return 0;
}
void writeImageData(const char *file_name, UCHAR* r, UCHAR* g, UCHAR* b,int width,int height,int bitDepth)
{
BMP* bmp=BMP_Create(width,height,bitDepth);
width = BMP_GetWidth(bmp); height = BMP_GetHeight(bmp);
for (int x = 0; x < width; ++x)
{
for (int y = 0; y < height; ++y)
{
BMP_SetPixelRGB(bmp, x, y, r[x*width + y], g[x*width + y], b[x*width + y]);
}
}
BMP_WriteFile(bmp, file_name);
}
Tank's for your help
UPDATE1
The source image is :
The result of save source image is :
UPDATE2
The value of bitDepth is 24 and code block for alocate memory is :
UCHAR* WimageDataR = (UCHAR*)calloc(128* 128, sizeof(UCHAR));
UCHAR* WimageDataG = (UCHAR*)calloc(128 * 128, sizeof(UCHAR));
UCHAR* WimageDataB = (UCHAR*)calloc(128 * 128, sizeof(UCHAR));

Answer 1

After while i finally found out what is wrong . in BMP_ReadFile() function of QDBMP when the image has size of 128*128 , the header parameter ImageDataSize will not read from the file and has 0 size . so i add this block of code to it to prevent this problem and every thing is just fine.
if (bmp->Header.ImageDataSize == 0)
{
bmp->Header.ImageDataSize = bmp->Header.FileSize - bmp->Header.DataOffset;
}