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ppm.cpp
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ppm.cpp
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//*****************************************************************************************//
// ppm.cpp - PPM Reading and writing functions
//
// Authors: Dr. Sam Siewert (siewerts@erau.edu)
// Ryan Claus (clausr@my.erau.edu)
// Matthew Demi Vis, Embry-Riddle Aeronautical University (MatthewVis@gmail.com)
//
// This code was used to obtain results documented in the SPIE Sensor and Technologies paper:
// S. Siewert, V. Angoth, R. Krishnamurthy, K. Mani, K. Mock, S. B. Singh, S. Srivistava,
// C. Wagner, R. Claus, M. Demi Vis, “Software Defined Multi-Spectral Imaging for Arctic
// Sensor Networks”, SPIE Algorithms and Technologies for Multipectral, Hyperspectral, and
// Ultraspectral Imagery XXII, Baltimore, Maryland, April 2016.
//
// This code was developed for, tested and run on a Jetson TK1 development kit by NVIDIA
// running TODO.
//
// Please use at your own risk. We are sharing so that other researchers and developers can
// recreate our results and make suggestions to improve and extend the benchmarks over time.
//
//*****************************************************************************************//
#include <stdio.h>
#include <stdlib.h>
#include <cstring>
#include <iostream>
#include <stdbool.h>
#include "ppm.h"
// RYAN
bool parse_ppm_header(const char *filename, unsigned int *width, unsigned int *height, unsigned int *channels) {
FILE *fp = NULL;
#ifdef _WIN32
errno_t err;
if ((err = fopen_s(&fp, filename, "rb")) != 0)
#else
if ((fp = fopen(filename, "rb")) == 0)
#endif
{
if (fp) { fclose(fp); }
std::cerr << "Error: failed to load '" << filename << "'" << std::endl;
return false;
}
const size_t headerSize = 0x40;
char header[headerSize];
if ((fgets(header, headerSize, fp) == NULL) && ferror(fp)) {
if (fp) { fclose(fp); }
std::cerr << "Error: '" << filename << "' is not a valid PPM image" << std::endl;
return false;
}
if (strncmp(header, "P5", 2) == 0) {
*channels = 1;
} else if (strncmp(header, "P6", 2) == 0) {
*channels = 3;
} else {
std::cerr << "Error: '" << filename << "' is not a valid PPM image" << std::endl;
return false;
}
int i = 0;
unsigned int maxval = 0;
while (i < 3) {
if ((fgets(header, headerSize, fp) == NULL) && ferror(fp)) {
if (fp) { fclose(fp); }
std::cerr << "Error: '" << filename << "' is not a valid PPM image" << std::endl;
return false;
}
// Skip comments
if (header[0] == '#') continue;
#ifdef _WIN32
if (i == 0) {
i += sscanf_s(header, "%u %u %u", width, height, &maxval);
} else if (i == 1) {
i += sscanf_s(header, "%u %u", height, &maxval);
} else if (i == 2) {
i += sscanf_s(header, "%u", &maxval);
}
#else
if (i == 0) {
i += sscanf(header, "%u %u %u", width, height, &maxval);
} else if (i == 1) {
i += sscanf(header, "%u %u", height, &maxval);
} else if (i == 2) {
i += sscanf(header, "%u", &maxval);
}
#endif
}
if (fp) { fclose(fp); }
return true;
}
bool
parse_ppm_data(const char *filename, unsigned int *width, unsigned int *height, unsigned int *channels, unsigned char *data) {
FILE *fp = NULL;
#ifdef _WIN32
errno_t err;
if ((err = fopen_s(&fp, filename, "rb")) != 0)
#else
if ((fp = fopen(filename, "rb")) == 0)
#endif
{
if (fp) { fclose(fp); }
std::cerr << "Error: failed to load '" << filename << "'" << std::endl;
return false;
}
const size_t headerSize = 0x40;
char header[headerSize];
if ((fgets(header, headerSize, fp) == NULL) && ferror(fp)) {
if (fp) { fclose(fp); }
std::cerr << "Error: '" << filename << "' is not a valid PPM image" << std::endl;
return false;
}
if (strncmp(header, "P5", 2) == 0) {
*channels = 1;
} else if (strncmp(header, "P6", 2) == 0) {
*channels = 3;
} else {
std::cerr << "Error: '" << filename << "' is not a valid PPM image" << std::endl;
return false;
}
int i = 0;
unsigned int maxval = 0;
while (i < 3) {
if ((fgets(header, headerSize, fp) == NULL) && ferror(fp)) {
if (fp) { fclose(fp); }
std::cerr << "Error: '" << filename << "' is not a valid PPM image" << std::endl;
return false;
}
// Skip comments
if (header[0] == '#') continue;
#ifdef _WIN32
if (i == 0) {
i += sscanf_s(header, "%u %u %u", width, height, &maxval);
} else if (i == 1) {
i += sscanf_s(header, "%u %u", height, &maxval);
} else if (i == 2) {
i += sscanf_s(header, "%u", &maxval);
}
#else
if (i == 0) {
i += sscanf(header, "%u %u %u", width, height, &maxval);
} else if (i == 1) {
i += sscanf(header, "%u %u", height, &maxval);
} else if (i == 2) {
i += sscanf(header, "%u", &maxval);
}
#endif
}
if (maxval == 0) {
if (fp) { fclose(fp); }
std::cerr << "Error: maximum color value must be greater than 0" << std::endl;
return false;
}
if (maxval > 255) {
if (fp) { fclose(fp); }
std::cerr << "Error: parser only supports 1 byte value PPM images" << std::endl;
return false;
}
unsigned char *raw = (unsigned char *) malloc(sizeof(unsigned char) * (*width) * (*height) * (*channels));
if (!raw) {
if (fp) { fclose(fp); }
std::cerr << "Error: could not allocate data buffer" << std::endl;
return false;
}
if (fread(raw, sizeof(unsigned char), *width * *height * *channels, fp) != *width * *height * *channels) {
if (fp) fclose(fp);
std::cerr << "Error: invalid image data" << std::endl;
return false;
}
if (fp) fclose(fp);
// Transfer the raw data
unsigned char *raw_ptr = raw;
if (*channels == 1) {
unsigned int *data_ptr = (unsigned int *) data;
for (int i = 0, e = *width * *height; i != e; ++i) {
*data_ptr++ = *raw_ptr++;
}
} else {
unsigned char *data_ptr = data;
for (int i = 0, e = *width * *height; i != e; ++i) {
// Read channels and pad as necessary (Little Endian)
*data_ptr++ = *raw_ptr++; // B
*data_ptr++ = *raw_ptr++; // G
*data_ptr++ = *raw_ptr++; // R
*data_ptr++ = 0;
}
}
free(raw);
return true;
}
// Dump frame data in PPM format.
void
dump_ppm_data(std::string filename, unsigned int width, unsigned int height, unsigned int channels, unsigned char *data) {
std::cout << "Dumping " << filename << std::endl;
FILE *f = fopen(filename.c_str(), "wb");
if (f != NULL) {
if (channels == 1) {
fprintf(f, "P5\n%d %d\n%d\n", width, height, 255);
for(unsigned int y = 0; y < height; ++y) {
for(unsigned int x = 0; x < width; ++x) {
// This assumes byte-order is little-endian.
unsigned char pixel = (unsigned char) data[y * width + x];
fwrite(&pixel, 1, 1, f);
}
}
fwrite(data, 1, width*height, f);
} else if (channels == 3) {
fprintf(f, "P6\n%d %d\n%d\n", width, height, 255);
for(unsigned int y = 0; y < height; ++y) {
for(unsigned int x = 0; x < width; ++x) {
// This assumes byte-order is little-endian.
unsigned int pixel = data[y * width + x];
fwrite(&pixel, 1, 3, f);
}
}
} else {
std::cout << "Cannot write this ppm file (wrong channel count: " << channels << ")" << std::endl;
}
fclose(f);
}
}
/* Siewert */
void readppm(unsigned char *buffer, int *bufferlen,
char *header, int *headerlen,
unsigned *rows, unsigned *cols, unsigned *chans,
const char *file)
{
char *aline=NULL; size_t linelen; FILE *filep;
char magic[2]; unsigned col, row, sat, channels=3;
int nread=0, toread=0, fd=0;
*headerlen=0;
filep=fopen(file, "r");
// read and validate header
if((*headerlen += getline(&aline, &linelen, filep)) < 0)
{perror("getline"); exit(-1);}
strcat(header, aline);
sscanf(aline, "%s", magic);
if(strncmp(magic, "P6", 2) == 0) channels=3; else channels=1;
// ignore comment line or print for debug
if((*headerlen += getline(&aline, &linelen, filep)) < 0)
{perror("getline"); exit(-1);}
strcat(header, aline);
if((*headerlen += getline(&aline, &linelen, filep)) < 0)
{perror("getline"); exit(-1);}
sscanf(aline, "%u %u", &col, &row);
strcat(header, aline);
*bufferlen=row*col*channels; toread=*bufferlen;
*rows=row, *cols=col, *chans=channels;
if((*headerlen += getline(&aline, &linelen, filep)) < 0)
{perror("getline"); exit(-1);}
sscanf(aline, "%u", &sat);
strcat(header, aline);
do
{
if((nread=fread(buffer, 1, (col*row*channels), filep)) == 0)
{
if(feof(filep))
{ printf("completed readppm\n"); break; }
else
{ perror("readppm"); exit(-1); }
}
buffer+=nread;
toread=toread-nread;
} while(toread > 0 && (!feof(filep)));
fclose(filep);
}
void writeppm(unsigned char *buffer, int bufferlen,
char *header, int headerlen,
const char *file)
{
FILE *filep;
int nwritten=0, towrite=0;
filep=fopen(file, "w");
printf("wrote %d bytes, header=%p, towrite=%d\n", nwritten, header, towrite);
do
{
if((nwritten=fwrite(header, 1, headerlen, filep)) == 0)
{
if(feof(filep))
{ printf("completed writeppm header\n"); break; }
else
{ perror("writeppm header"); exit(-1); }
}
header+=nwritten;
towrite=towrite-nwritten;
printf("wrote %d bytes, header=%p, towrite=%d\n", nwritten, header, towrite);
} while(towrite > 0);
towrite=0; nwritten=0;
printf("wrote %d bytes, buffer=%p, towrite=%d\n", nwritten, buffer, towrite);
do
{
if((nwritten=fwrite(buffer, 1, bufferlen, filep)) == 0)
{
if(feof(filep))
{ printf("completed writeppm\n"); break; }
else
{ perror("writeppm"); exit(-1); }
}
buffer+=nwritten;
towrite=towrite-nwritten;
printf("wrote %d bytes, buffer=%p, towrite=%d\n", nwritten, buffer, towrite);
} while(towrite > 0);
fclose(filep);
}