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allow some more stdin/stout I/O

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* allow reading from stdin for dwebp / vwebp
 * allow writing to stdout for gif2webp

by introducing a new function ExUtilReadFromStdin()

Example use: cat in.webp | dwebp -o - -- - > out.png

Note that the '-- -' option must appear *last*
(as per general fashion for '--' option parsing)

Change-Id: I8df0f3a246cc325925d6b6f668ba060f7dd81d68
This commit is contained in:
skal
2014-03-12 19:32:16 +01:00
parent 84ed4b3aa5
commit 2bcad89b4c
6 changed files with 71 additions and 11 deletions
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6
examples/example_util.h
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@ -22,10 +22,16 @@ extern "C" {
// Allocates storage for entire file 'file_name' and returns contents and size
// in 'data' and 'data_size'. Returns 1 on success, 0 otherwise. '*data' should
// be deleted using free().
// If 'file_name' is NULL or equal to "-", input is read from stdin by calling
// the function ExUtilReadFromStdin().
int ExUtilReadFile(const char* const file_name,
const uint8_t** data, size_t* data_size);
// Same as ExUtilReadFile(), but reads until EOF from stdin instead.
int ExUtilReadFromStdin(const uint8_t** data, size_t* data_size);
// Write a data segment into a file named 'file_name'. Returns true if ok.
// If 'file_name' is NULL or equal to "-", output is written to stdout.
int ExUtilWriteFile(const char* const file_name,
const uint8_t* data, size_t data_size);