example_util.c
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// Copyright 2012 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// Utility functions used by the example programs.
//
#include "./example_util.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "webp/mux_types.h"
#include "../imageio/imageio_util.h"
//------------------------------------------------------------------------------
// String parsing
uint32_t ExUtilGetUInt(const char* const v, int base, int* const error) {
char* end = NULL;
const uint32_t n = (v != NULL) ? (uint32_t)strtoul(v, &end, base) : 0u;
if (end == v && error != NULL && !*error) {
*error = 1;
fprintf(stderr, "Error! '%s' is not an integer.\n",
(v != NULL) ? v : "(null)");
}
return n;
}
int ExUtilGetInt(const char* const v, int base, int* const error) {
return (int)ExUtilGetUInt(v, base, error);
}
int ExUtilGetInts(const char* v, int base, int max_output, int output[]) {
int n, error = 0;
for (n = 0; v != NULL && n < max_output; ++n) {
const int value = ExUtilGetInt(v, base, &error);
if (error) return -1;
output[n] = value;
v = strchr(v, ',');
if (v != NULL) ++v; // skip over the trailing ','
}
return n;
}
float ExUtilGetFloat(const char* const v, int* const error) {
char* end = NULL;
const float f = (v != NULL) ? (float)strtod(v, &end) : 0.f;
if (end == v && error != NULL && !*error) {
*error = 1;
fprintf(stderr, "Error! '%s' is not a floating point number.\n",
(v != NULL) ? v : "(null)");
}
return f;
}
//------------------------------------------------------------------------------
static void ResetCommandLineArguments(int argc, const char* argv[],
CommandLineArguments* const args) {
assert(args != NULL);
args->argc_ = argc;
args->argv_ = argv;
args->own_argv_ = 0;
WebPDataInit(&args->argv_data_);
}
void ExUtilDeleteCommandLineArguments(CommandLineArguments* const args) {
if (args != NULL) {
if (args->own_argv_) {
free((void*)args->argv_);
WebPDataClear(&args->argv_data_);
}
ResetCommandLineArguments(0, NULL, args);
}
}
#define MAX_ARGC 16384
int ExUtilInitCommandLineArguments(int argc, const char* argv[],
CommandLineArguments* const args) {
if (args == NULL || argv == NULL) return 0;
ResetCommandLineArguments(argc, argv, args);
if (argc == 1 && argv[0][0] != '-') {
char* cur;
const char sep[] = " \t\r\n\f\v";
#if defined(_WIN32) && defined(_UNICODE)
fprintf(stderr,
"Error: Reading arguments from a file is a feature unavailable "
"with Unicode binaries.\n");
return 0;
#endif
if (!ExUtilReadFileToWebPData(argv[0], &args->argv_data_)) {
return 0;
}
args->own_argv_ = 1;
args->argv_ = (const char**)malloc(MAX_ARGC * sizeof(*args->argv_));
if (args->argv_ == NULL) return 0;
argc = 0;
for (cur = strtok((char*)args->argv_data_.bytes, sep);
cur != NULL;
cur = strtok(NULL, sep)) {
if (argc == MAX_ARGC) {
fprintf(stderr, "ERROR: Arguments limit %d reached\n", MAX_ARGC);
return 0;
}
assert(strlen(cur) != 0);
args->argv_[argc++] = cur;
}
args->argc_ = argc;
}
return 1;
}
//------------------------------------------------------------------------------
int ExUtilReadFileToWebPData(const char* const filename,
WebPData* const webp_data) {
const uint8_t* data;
size_t size;
if (webp_data == NULL) return 0;
if (!ImgIoUtilReadFile(filename, &data, &size)) return 0;
webp_data->bytes = data;
webp_data->size = size;
return 1;
}