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https://github.com/webmproject/libwebp.git
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2bcad89b4c
* 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
110 lines
3.0 KiB
C
110 lines
3.0 KiB
C
// Copyright 2012 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Utility functions used by the example programs.
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//
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#include "./example_util.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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// -----------------------------------------------------------------------------
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// File I/O
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static const size_t kBlockSize = 16384; // default initial size
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int ExUtilReadFromStdin(const uint8_t** data, size_t* data_size) {
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size_t max_size = 0;
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size_t size = 0;
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uint8_t* input = NULL;
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if (data == NULL || data_size == NULL) return 0;
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*data = NULL;
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*data_size = 0;
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while (!feof(stdin)) {
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// We double the buffer size each time and read as much as possible.
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const size_t extra_size = (max_size == 0) ? kBlockSize : max_size;
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void* const new_data = realloc(input, max_size + extra_size);
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if (new_data == NULL) goto Error;
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input = (uint8_t*)new_data;
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max_size += extra_size;
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size += fread(input + size, 1, extra_size, stdin);
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if (size < max_size) break;
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}
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if (ferror(stdin)) goto Error;
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*data = input;
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*data_size = size;
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return 1;
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Error:
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free(input);
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fprintf(stderr, "Could not read from stdin\n");
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return 0;
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}
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int ExUtilReadFile(const char* const file_name,
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const uint8_t** data, size_t* data_size) {
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int ok;
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void* file_data;
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size_t file_size;
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FILE* in;
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const int from_stdin = (file_name == NULL) || !strcmp(file_name, "-");
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if (from_stdin) return ExUtilReadFromStdin(data, data_size);
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if (data == NULL || data_size == NULL) return 0;
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*data = NULL;
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*data_size = 0;
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in = fopen(file_name, "rb");
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if (in == NULL) {
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fprintf(stderr, "cannot open input file '%s'\n", file_name);
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return 0;
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}
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fseek(in, 0, SEEK_END);
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file_size = ftell(in);
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fseek(in, 0, SEEK_SET);
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file_data = malloc(file_size);
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if (file_data == NULL) return 0;
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ok = (fread(file_data, file_size, 1, in) == 1);
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fclose(in);
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if (!ok) {
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fprintf(stderr, "Could not read %d bytes of data from file %s\n",
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(int)file_size, file_name);
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free(file_data);
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return 0;
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}
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*data = (uint8_t*)file_data;
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*data_size = file_size;
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return 1;
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}
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int ExUtilWriteFile(const char* const file_name,
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const uint8_t* data, size_t data_size) {
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int ok;
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FILE* out;
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const int to_stdout = (file_name == NULL) || !strcmp(file_name, "-");
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if (data == NULL) {
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return 0;
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}
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out = to_stdout ? stdout : fopen(file_name, "wb");
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if (out == NULL) {
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fprintf(stderr, "Error! Cannot open output file '%s'\n", file_name);
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return 0;
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}
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ok = (fwrite(data, data_size, 1, out) == 1);
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if (out != stdout) fclose(out);
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return ok;
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}
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