--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/example/cuda_fft/pgm.h	Tue Jun 03 18:10:19 2014 +0900
@@ -0,0 +1,187 @@
+#ifndef _PGM_H_
+#define _PGM_H_
+ 
+#include <math.h>
+#include <string.h>
+ 
+#define PGM_MAGIC "P5"
+ 
+#ifdef _WIN32
+#define STRTOK_R(ptr, del, saveptr) strtok_s(ptr, del, saveptr)
+#else
+#define STRTOK_R(ptr, del, saveptr) strtok_r(ptr, del, saveptr)
+#endif
+ 
+typedef struct _pgm_t {
+    int width;
+    int height;
+    unsigned char *buf;
+} pgm_t;
+ 
+int readPGM(pgm_t* pgm, const char* filename)
+{
+    char *token, *pc, *saveptr;
+    char *buf;
+    size_t bufsize;
+    char del[] = " \t\n";
+    unsigned char *dot;
+ 
+    long begin, end;
+    int filesize;
+    int i, w, h, luma, pixs;
+ 
+ 
+    FILE* fp;
+    if ((fp = fopen(filename, "rb"))==NULL) {
+        fprintf(stderr, "Failed to open file\n");
+        return -1;
+    }
+ 
+    fseek(fp, 0, SEEK_SET);
+    begin = ftell(fp);
+    fseek(fp, 0, SEEK_END);
+    end = ftell(fp);
+    filesize = (int)(end - begin);
+ 
+    buf = (char*)malloc(filesize * sizeof(char));
+    fseek(fp, 0, SEEK_SET);
+    bufsize = fread(buf, filesize * sizeof(char), 1, fp);
+ 
+    fclose(fp);
+ 
+    token = (char *)STRTOK_R(buf, del, &saveptr);
+    if (strncmp(token, PGM_MAGIC, 2) != 0) {
+        return -1;
+    }
+ 
+    token = (char *)STRTOK_R(NULL, del, &saveptr);
+    if (token[0] == '#' ) {
+        token = (char *)STRTOK_R(NULL, "\n", &saveptr);
+        token = (char *)STRTOK_R(NULL, del, &saveptr);
+    }
+ 
+    w = strtoul(token, &pc, 10);
+    token = (char *)STRTOK_R(NULL, del, &saveptr);
+    h = strtoul(token, &pc, 10);
+    token = (char *)STRTOK_R(NULL, del, &saveptr);
+    luma = strtoul(token, &pc, 10);
+ 
+    token = pc + 1;
+    pixs = w * h;
+ 
+    pgm->buf = (unsigned char *)malloc(pixs * sizeof(unsigned char));
+ 
+    dot = pgm->buf;
+ 
+    for (i=0; i< pixs; i++, dot++) {
+        *dot = *token++;
+    }
+ 
+    pgm->width = w;
+    pgm->height = h;
+ 
+    return 0;
+}
+ 
+int writePGM(pgm_t* pgm, const char* filename)
+{
+    int i, w, h, pixs;
+    FILE* fp;
+    unsigned char* dot;
+ 
+    w = pgm->width;
+    h = pgm->height;
+    pixs = w * h;
+ 
+    if ((fp = fopen(filename, "wb+")) ==NULL) {
+        fprintf(stderr, "Failed to open file\n");
+        return -1;
+    }
+ 
+    fprintf (fp, "%s\n%d %d\n255\n", PGM_MAGIC, w, h);
+ 
+    dot = pgm->buf;
+ 
+    for (i=0; i<pixs; i++, dot++) {
+        putc((unsigned char)*dot, fp);
+    }
+ 
+    fclose(fp);
+ 
+    return 0;
+}
+ 
+int normalizeD2PGM(pgm_t* pgm, double* x)
+{
+    int i, j, w, h;
+ 
+    w = pgm->width;
+    h = pgm->height;
+ 
+    pgm->buf = (unsigned char*)malloc(w * h * sizeof(unsigned char));
+ 
+    double min = 0;
+    double max = 0;
+    for (i=0; i < h; i++) {
+        for (j=0; j < w; j++) {
+            if (max < x[i*w+j])
+                max = x[i*w+j];
+            if (min > x[i*w+j])
+                min = x[i*w+j];
+        }
+    }
+ 
+    for (i=0; i < h; i++) {
+        for (j=0; j < w; j++) {
+            if((max-min)!=0)
+                pgm->buf[i*w+j] = (unsigned char)(255*(x[i*w+j]-min)/(max-min));
+            else
+                pgm->buf[i*w+j]= 0;
+        }
+    }
+ 
+    return 0;
+}
+ 
+int normalizeF2PGM(pgm_t* pgm, float* x)
+{
+    int i, j, w, h;
+ 
+    w = pgm->width;
+    h = pgm->height;
+ 
+    pgm->buf = (unsigned char*)malloc(w * h * sizeof(unsigned char));
+ 
+    float min = 0;
+    float max = 0;
+    for (i=0; i < h; i++) {
+        for (j=0; j < w; j++) {
+            if (max < x[i*w+j])
+                max = x[i*w+j];
+            if (min > x[i*w+j])
+                min = x[i*w+j];
+        }
+    }
+ 
+    for (i=0; i < h; i++) {
+        for (j=0; j < w; j++) {
+            if((max-min)!=0)
+                pgm->buf[i*w+j] = (unsigned char)(255*(x[i*w+j]-min)/(max-min));
+            else
+                pgm->buf[i*w+j]= 0;
+        }
+    }
+ 
+    return 0;
+}
+ 
+int destroyPGM(pgm_t* pgm)
+{
+    if (pgm->buf) {
+        free(pgm->buf);
+    }
+ 
+    return 0;
+}
+ 
+#endif /* _PGM_H_ */