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#include <stdio.h>
#include <stdlib.h>
#define STBI_WINDOWS_UTF8
#ifdef _WIN32
#define WIN32 // what stb.h checks
#pragma comment(lib, "advapi32.lib")
#endif
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
#define STB_DEFINE
#include "deprecated/stb.h"
static unsigned int fnv1a_hash32(const stbi_uc *bytes, size_t len)
{
unsigned int hash = 0x811c9dc5;
unsigned int mul = 0x01000193;
size_t i;
for (i = 0; i < len; ++i)
hash = (hash ^ bytes[i]) * mul;
return hash;
}
// The idea for this test is to leave pngsuite/ref_results.csv checked in,
// and then you can run this test after making PNG loader changes. If the
// ref results change (as per git diff), confirm that the change was
// intentional. If so, commit them as well; if not, undo.
int main()
{
char **files;
FILE *csv_file;
int i;
files = stb_readdir_recursive("pngsuite", "*.png");
if (!files) {
fprintf(stderr, "pngsuite files not found!\n");
return 1;
}
// sort files by name
qsort(files, stb_arr_len(files), sizeof(char*), stb_qsort_strcmp(0));
csv_file = fopen("pngsuite/ref_results.csv", "w");
if (!csv_file) {
fprintf(stderr, "error opening ref results for writing!\n");
stb_readdir_free(files);
return 1;
}
fprintf(csv_file, "filename,width,height,ncomp,error,hash\n");
for (i = 0; i < stb_arr_len(files); ++i) {
char *filename = files[i];
int width, height, ncomp;
stbi_uc *pixels = stbi_load(filename, &width, &height, &ncomp, 0);
const char *error = "";
unsigned int hash = 0;
if (!pixels)
error = stbi_failure_reason();
else {
hash = fnv1a_hash32(pixels, width * height * ncomp);
stbi_image_free(pixels);
}
fprintf(csv_file, "%s,%d,%d,%d,%s,0x%08x\n", filename, width, height, ncomp, error, hash);
}
fclose(csv_file);
stb_readdir_free(files);
}
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