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98 lines
2.2 KiB
98 lines
2.2 KiB
//========= 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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