mirror of https://git.matrix.org/git/olm.git
97 lines
2.3 KiB
C++
97 lines
2.3 KiB
C++
#include "olm/olm.hh"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stddef.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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ssize_t read_file(
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int fd,
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uint8_t **buffer
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) {
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size_t buffer_size = 4096;
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size_t buffer_pos = 0;
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uint8_t * current_buffer = (uint8_t *) malloc(buffer_size);
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if (!current_buffer) return -1;
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while (1) {
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ssize_t count = read(
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fd, current_buffer + buffer_pos, buffer_size - buffer_pos
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);
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if (count < 0) break; // A read error happened, so just fail immediately.
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if (count == 0) {
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// Nothing more left to read. We downsize the buffer to fit the
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// data exactly, unless no data was read at all, in which case we
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// skip the downsizing.
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if (buffer_pos != 0) {
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current_buffer = (uint8_t *) realloc(current_buffer, buffer_pos);
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if (!current_buffer) break;
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}
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// The read was successful so we return the allocated buffer.
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*buffer = current_buffer;
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return buffer_pos;
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}
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buffer_pos += count;
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// We've reached capacity, so enlarge the buffer.
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if (buffer_pos == buffer_size) {
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buffer_size *= 2;
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uint8_t * new_buffer = (uint8_t *) realloc(current_buffer, buffer_size);
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if (!new_buffer) break;
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current_buffer = new_buffer;
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}
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}
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free(current_buffer);
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return -1;
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}
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template<typename T>
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T check_errno(
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const char * message,
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T value
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) {
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if (value == T(-1)) {
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perror(message);
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exit(1);
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}
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return value;
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}
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template<typename T, typename F>
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size_t check_error(
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F f,
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T * object,
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const char * message,
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size_t value
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) {
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if (value == olm_error()) {
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const char * olm_message = f(object);
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(void)write(STDERR_FILENO, message, strlen(message));
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(void)write(STDERR_FILENO, ": ", 2);
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(void)write(STDERR_FILENO, olm_message, strlen(olm_message));
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(void)write(STDERR_FILENO, "\n", 1);
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exit(2);
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}
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return value;
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}
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size_t check_session(
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OlmSession * session,
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const char * message,
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size_t value
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) {
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return check_error(olm_session_last_error, session, message, value);
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}
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