99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/**
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* @file read_file.h
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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* Function for reading a file into memory using stdio.
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*/
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#ifndef BADVPN_MISC_READ_FILE_H
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#define BADVPN_MISC_READ_FILE_H
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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static int read_file (const char *file, uint8_t **out_data, size_t *out_len)
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{
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FILE *f = fopen(file, "r");
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if (!f) {
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goto fail0;
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}
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size_t buf_len = 0;
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size_t buf_size = 128;
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uint8_t *buf = (uint8_t *)malloc(buf_size);
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if (!buf) {
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goto fail1;
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}
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while (1) {
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if (buf_len == buf_size) {
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if (2 > SIZE_MAX / buf_size) {
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goto fail;
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}
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size_t newsize = 2 * buf_size;
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uint8_t *newbuf = (uint8_t *)realloc(buf, newsize);
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if (!newbuf) {
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goto fail;
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}
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buf = newbuf;
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buf_size = newsize;
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}
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size_t bytes = fread(buf + buf_len, 1, buf_size - buf_len, f);
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if (bytes == 0) {
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if (feof(f)) {
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break;
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}
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goto fail;
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}
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buf_len += bytes;
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}
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fclose(f);
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*out_data = buf;
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*out_len = buf_len;
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return 1;
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fail:
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free(buf);
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fail1:
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fclose(f);
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fail0:
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return 0;
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}
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#endif
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