Base function

Detect some MIME types of printing documents. More...

Functions
int	detect_mimetype (const char *buf, size_t sz, const char **mimetype)

Detailed Description

Used to assign a corresponding rasterizer.

Function Documentation

detect_mimetype()

int detect_mimetype	(	const char *	buf,
		size_t	sz,
		const char **	mimetype
	)

Detect the MIME type of the given header of file content

Parameters

[in]	buf	Pointer to files header data
[in]	sz	Count of bytes of file data
[out]	mimetype	Where to store a pointer to the file's content MIME type

Returns

0 on success (*mimetype is valid), negative errno else

This function is a wrapper for the CAPS implementation of detecting a few kind of printing document formats. It will be used, if libmagic isn't available or disabled at build-time.

Currently detected printing document formats:

• "image/pwg-raster"
• "image/png"
• "image/jpeg"
• "application/postscript"
• "application/pdf"
• "application/cups-raster"
• "application/x-lzw"

Any leading PJL commands are skipped to detect the real data's MIME format.

Precondition

Provide enough data (not only a few bytes) from the header of the file.

If libmagic is available and enabled at build-time, it is used instead. The calling code can continue to use the detect_mimetype() function in this case (another wrapper does the job).

Attention

This routine isn't thread safe!