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torben |
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#include "gdpp.h" |
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#ifdef __cplusplus |
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namespace GD |
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{ |
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bool Image::CreateFrom(FILE * in) |
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{ |
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bool rtn; |
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int c = fgetc(in); |
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ungetc(c, in); |
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switch (c) |
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{ |
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/* PNG |
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The first eight bytes of a PNG file always contain the following (decimal) values: |
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0x89 0x50 0x4E 0x47 0x0D 0x0A 0x1A 0x0A |
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== .PNG\r\n.\n |
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*/ |
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case 0x89: // PNG |
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rtn = CreateFromPng(in); |
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break; |
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/* GIF |
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0x47 0x49 0x46 |
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*/ |
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case 0x47: // GIF |
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rtn = CreateFromGif(in); |
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break; |
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/* JPEG |
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A JFIF-standard file will start with the four bytes (hex) FF D8 FF E0, |
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followed by two variable bytes (often hex 00 10), followed by 'JFIF'. |
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*/ |
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case 0xFF: // JPEG |
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rtn = CreateFromJpeg(in); |
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break; |
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/* WBMP |
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WBMP Type 0: B/W, Uncompressed bitmap is the only gd supported type |
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*/ |
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case 0x00: // WBMP |
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rtn = CreateFromWBMP(in); |
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break; |
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/* GD2 |
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0x67 0x64 0x32 0x00 |
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== GD2\0 |
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Starts with gd2 |
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*/ |
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case 0x67: // GD2 |
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rtn = CreateFromGd2(in); |
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break; |
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/* GD |
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0xFF 0xFE |
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or |
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0xFF 0xFF |
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Conflicts with Jpeg |
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*/ |
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/* XBM |
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#define test_width 16 |
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#define test_height 7 |
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*/ |
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case 0x23: // XBM |
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rtn = CreateFromXbm(in); |
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break; |
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default: |
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rtn = false; |
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break; |
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} |
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return rtn; |
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} |
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bool Image::CreateFrom(std::istream & in) |
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{ |
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bool rtn; |
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switch (in.peek()) |
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{ |
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/* PNG |
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The first eight bytes of a PNG file always contain the following (decimal) values: |
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0x89 0x50 0x4E 0x47 0x0D 0x0A 0x1A 0x0A |
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== .PNG\r\n.\n |
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*/ |
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case 0x89: // PNG |
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rtn = CreateFromPng(in); |
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break; |
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/* GIF |
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0x47 0x49 0x46 |
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*/ |
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case 0x47: // GIF |
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rtn = CreateFromGif(in); |
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break; |
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/* JPEG |
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A JFIF-standard file will start with the four bytes (hex) FF D8 FF E0, |
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followed by two variable bytes (often hex 00 10), followed by 'JFIF'. |
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*/ |
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case 0xFF: // JPEG |
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rtn = CreateFromJpeg(in); |
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break; |
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/* WBMP |
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WBMP Type 0: B/W, Uncompressed bitmap is the only gd supported type |
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*/ |
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case 0x00: // WBMP |
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rtn = CreateFromWBMP(in); |
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break; |
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/* GD2 |
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0x67 0x64 0x32 0x00 |
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== GD2\0 |
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Starts with gd2 |
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*/ |
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case 0x67: // GD2 |
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rtn = CreateFromGd2(in); |
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break; |
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/* GD |
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0xFF 0xFE |
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or |
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0xFF 0xFF |
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Conflicts with Jpeg |
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*/ |
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default: |
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rtn = false; |
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break; |
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} |
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return rtn; |
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} |
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} // namespace GD |
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std::istream & operator>> (std::istream & in, GD::Image & img) |
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{ |
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img.CreateFrom(in); |
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return in; |
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} |
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#endif /* __cplusplus */ |
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