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extern void cupsRasterClose(cups_raster_t *r);
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extern cups_raster_t *cupsRasterOpen(int fd, cups_mode_t mode);
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extern unsigned cupsRasterReadHeader(cups_raster_t *r,
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extern unsigned cupsRasterReadPixels(cups_raster_t *r,
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unsigned char *p, unsigned len);
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extern unsigned cupsRasterWriteHeader(cups_raster_t *r,
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extern unsigned cupsRasterWritePixels(cups_raster_t *r,
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unsigned char *p, unsigned len);