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get image mime type from base64
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| function guessImageMime(data){ | |
| if(data.charAt(0)=='/'){ | |
| return "image/jpeg"; | |
| }else if(data.charAt(0)=='R'){ | |
| return "image/gif"; | |
| }else if(data.charAt(0)=='i'){ | |
| return "image/png"; | |
| } | |
| } |
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