99 lines
2.2 KiB
C++
99 lines
2.2 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//
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//=============================================================================//
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#include <windows.h>
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#include <STDIO.H>
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int
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ReadBmpFile(
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char* szFile,
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unsigned char** ppbPalette,
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unsigned char** ppbBits,
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int *pwidth,
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int *pheight)
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{
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int rc = 0;
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FILE *pfile = NULL;
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BITMAPFILEHEADER bmfh;
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BITMAPINFOHEADER bmih;
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RGBQUAD rgrgbPalette[256];
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ULONG cbPalBytes;
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ULONG cbBmpBits;
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BYTE* pbBmpBits;
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// Bogus parameter check
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if (!(ppbPalette != NULL && ppbBits != NULL))
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{ rc = -1000; goto GetOut; }
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// File exists?
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if ((pfile = fopen(szFile, "rb")) == NULL)
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{ rc = -1; goto GetOut; }
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// Read file header
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if (fread(&bmfh, sizeof bmfh, 1/*count*/, pfile) != 1)
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{ rc = -2; goto GetOut; }
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// Bogus file header check
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if (!(bmfh.bfReserved1 == 0 && bmfh.bfReserved2 == 0))
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{ rc = -2000; goto GetOut; }
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// Read info header
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if (fread(&bmih, sizeof bmih, 1/*count*/, pfile) != 1)
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{ rc = -3; goto GetOut; }
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// Bogus info header check
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if (!(bmih.biSize == sizeof bmih && bmih.biPlanes == 1))
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{ rc = -3000; goto GetOut; }
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// Bogus bit depth? Only 8-bit supported.
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if (bmih.biBitCount != 8)
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{ rc = -4; goto GetOut; }
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// Bogus compression? Only non-compressed supported.
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if (bmih.biCompression != BI_RGB)
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{ rc = -5; goto GetOut; }
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// Figure out how many entires are actually in the table
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if (bmih.biClrUsed == 0)
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{
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cbPalBytes = (1 << bmih.biBitCount) * sizeof( RGBQUAD );
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}
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else
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{
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cbPalBytes = bmih.biClrUsed * sizeof( RGBQUAD );
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}
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// Read palette (256 entries)
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if (fread(rgrgbPalette, cbPalBytes, 1/*count*/, pfile) != 1)
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{ rc = -6; goto GetOut; }
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// Read bitmap bits (remainder of file)
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cbBmpBits = bmfh.bfSize - ftell(pfile);
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pbBmpBits = (BYTE *)malloc(cbBmpBits);
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if (fread(pbBmpBits, cbBmpBits, 1/*count*/, pfile) != 1)
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{ rc = -7; goto GetOut; }
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// Set output parameters
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*ppbPalette = (BYTE *)malloc(sizeof rgrgbPalette);
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memcpy(*ppbPalette, rgrgbPalette, cbPalBytes);
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*ppbBits = pbBmpBits;
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*pwidth = bmih.biWidth;
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*pheight = bmih.biHeight;
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printf("w %d h %d s %d\n",bmih.biWidth, bmih.biHeight, cbBmpBits );
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GetOut:
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if (pfile) fclose(pfile);
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return rc;
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}
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