1 // Copyright 2012 Google Inc. All Rights Reserved.
2 //
3 // Use of this source code is governed by a BSD-style license
4 // that can be found in the COPYING file in the root of the source
5 // tree. An additional intellectual property rights grant can be found
6 // in the file PATENTS. All contributing project authors may
7 // be found in the AUTHORS file in the root of the source tree.
8 // -----------------------------------------------------------------------------
9 //
10 //  Utility functions used by the example programs.
11 //
12 
13 #ifndef WEBP_EXAMPLES_EXAMPLE_UTIL_H_
14 #define WEBP_EXAMPLES_EXAMPLE_UTIL_H_
15 
16 #include "webp/types.h"
17 #include "webp/mux_types.h"
18 
19 #ifdef __cplusplus
20 extern "C" {
21 #endif
22 
23 //------------------------------------------------------------------------------
24 // String parsing
25 
26 // Parses 'v' using strto(ul|l|d)(). If error is non-NULL, '*error' is set to
27 // true on failure while on success it is left unmodified to allow chaining of
28 // calls. An error is only printed on the first occurrence.
29 uint32_t ExUtilGetUInt(const char* const v, int base, int* const error);
30 int ExUtilGetInt(const char* const v, int base, int* const error);
31 float ExUtilGetFloat(const char* const v, int* const error);
32 
33 // This variant of ExUtilGetInt() will parse multiple integers from a
34 // comma-separated list. Up to 'max_output' integers are parsed.
35 // The result is placed in the output[] array, and the number of integers
36 // actually parsed is returned, or -1 if an error occurred.
37 int ExUtilGetInts(const char* v, int base, int max_output, int output[]);
38 
39 // Reads a file named 'filename' into a WebPData structure. The content of
40 // webp_data is overwritten. Returns false in case of error.
41 int ExUtilReadFileToWebPData(const char* const filename,
42                              WebPData* const webp_data);
43 
44 //------------------------------------------------------------------------------
45 // Command-line arguments
46 
47 typedef struct {
48   int argc_;
49   const char** argv_;
50   WebPData argv_data_;
51   int own_argv_;
52 } CommandLineArguments;
53 
54 // Initializes the structure from the command-line parameters. If there is
55 // only one parameter and it does not start with a '-', then it is assumed to
56 // be a file name. This file will be read and tokenized into command-line
57 // arguments. The content of 'args' is overwritten.
58 // Returns false in case of error (memory allocation failure, non
59 // existing file, too many arguments, ...).
60 int ExUtilInitCommandLineArguments(int argc, const char* argv[],
61                                    CommandLineArguments* const args);
62 
63 // Deallocate all memory and reset 'args'.
64 void ExUtilDeleteCommandLineArguments(CommandLineArguments* const args);
65 
66 #ifdef __cplusplus
67 }    // extern "C"
68 #endif
69 
70 #endif  // WEBP_EXAMPLES_EXAMPLE_UTIL_H_
71