pnm.h

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/* Copyright (C) 2013-2016, The Regents of The University of Michigan.
All rights reserved.
This software was developed in the APRIL Robotics Lab under the
direction of Edwin Olson, ebolson@umich.edu. This software may be
available under alternative licensing terms; contact the address above.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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The views and conclusions contained in the software and documentation are those
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either expressed or implied, of the Regents of The University of Michigan.
*/

#pragma once

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

#define PNM_FORMAT_BINARY 4
#define PNM_FORMAT_GRAY 5
#define PNM_FORMAT_RGB  6

// supports ppm, pnm, pgm

typedef struct pnm pnm_t;
struct pnm
{
    int width, height;
    int format;
    int max; // 1 = binary, 255 = one byte, 65535 = two bytes

    uint32_t buflen;
    uint8_t *buf; // if max=65535, in big endian
};

pnm_t *pnm_create_from_file(const char *path);
void pnm_destroy(pnm_t *pnm);

#ifdef __cplusplus
}
#endif