Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $NoKeywords: $
//
//=============================================================================//
#include <windows.h>
#include <STDIO.H>
int
ReadBmpFile(
char* szFile,
unsigned char** ppbPalette,
unsigned char** ppbBits,
int *pwidth,
int *pheight)
{
int rc = 0;
FILE *pfile = NULL;
BITMAPFILEHEADER bmfh;
BITMAPINFOHEADER bmih;
RGBQUAD rgrgbPalette[256];
ULONG cbPalBytes;
ULONG cbBmpBits;
BYTE* pbBmpBits;
// Bogus parameter check
if (!(ppbPalette != NULL && ppbBits != NULL))
{ rc = -1000; goto GetOut; }
// File exists?
if ((pfile = fopen(szFile, "rb")) == NULL)
{ rc = -1; goto GetOut; }
// Read file header
if (fread(&bmfh, sizeof bmfh, 1/*count*/, pfile) != 1)
{ rc = -2; goto GetOut; }
// Bogus file header check
if (!(bmfh.bfReserved1 == 0 && bmfh.bfReserved2 == 0))
{ rc = -2000; goto GetOut; }
// Read info header
if (fread(&bmih, sizeof bmih, 1/*count*/, pfile) != 1)
{ rc = -3; goto GetOut; }
// Bogus info header check
if (!(bmih.biSize == sizeof bmih && bmih.biPlanes == 1))
{ rc = -3000; goto GetOut; }
// Bogus bit depth? Only 8-bit supported.
if (bmih.biBitCount != 8)
{ rc = -4; goto GetOut; }
// Bogus compression? Only non-compressed supported.
if (bmih.biCompression != BI_RGB)
{ rc = -5; goto GetOut; }
// Figure out how many entires are actually in the table
if (bmih.biClrUsed == 0)
{
cbPalBytes = (1 << bmih.biBitCount) * sizeof( RGBQUAD );
}
else
{
cbPalBytes = bmih.biClrUsed * sizeof( RGBQUAD );
}
// Read palette (256 entries)
if (fread(rgrgbPalette, cbPalBytes, 1/*count*/, pfile) != 1)
{ rc = -6; goto GetOut; }
// Read bitmap bits (remainder of file)
cbBmpBits = bmfh.bfSize - ftell(pfile);
pbBmpBits = (BYTE *)malloc(cbBmpBits);
if (fread(pbBmpBits, cbBmpBits, 1/*count*/, pfile) != 1)
{ rc = -7; goto GetOut; }
// Set output parameters
*ppbPalette = (BYTE *)malloc(sizeof rgrgbPalette);
memcpy(*ppbPalette, rgrgbPalette, cbPalBytes);
*ppbBits = pbBmpBits;
*pwidth = bmih.biWidth;
*pheight = bmih.biHeight;
printf("w %d h %d s %d\n",bmih.biWidth, bmih.biHeight, cbBmpBits );
GetOut:
if (pfile) fclose(pfile);
return rc;
}