/* SPDX-License-Identifier: GPL-2.0-only */ #include <fcntl.h> #include <errno.h> #include <limits.h> #include <stdio.h> #include <sys/stat.h> #include <unistd.h> #include <string.h> #include <stdlib.h> #include "amdfwtool.h" void write_or_fail(int fd, void *ptr, size_t size) { ssize_t written; written = write_from_buf_to_file(fd, ptr, size); if (written < 0 || (size_t)written != size) { fprintf(stderr, "%s: Error writing %zu bytes - written %zd bytes\n", __func__, size, written); exit(-1); } } ssize_t read_from_file_to_buf(int fd, void *buf, size_t buf_size) { ssize_t bytes; size_t total_bytes = 0; do { bytes = read(fd, buf + total_bytes, buf_size - total_bytes); if (bytes == 0) { fprintf(stderr, "Reached EOF probably\n"); break; } if (bytes < 0 && errno == EAGAIN) bytes = 0; if (bytes < 0) { fprintf(stderr, "Read failure %s\n", strerror(errno)); return bytes; } total_bytes += bytes; } while (total_bytes < buf_size); if (total_bytes != buf_size) { fprintf(stderr, "Read data size(%zu) != buffer size(%zu)\n", total_bytes, buf_size); return -1; } return buf_size; } ssize_t write_from_buf_to_file(int fd, const void *buf, size_t buf_size) { ssize_t bytes; size_t total_bytes = 0; do { bytes = write(fd, buf + total_bytes, buf_size - total_bytes); if (bytes < 0 && errno == EAGAIN) bytes = 0; if (bytes < 0) { fprintf(stderr, "Write failure %s\n", strerror(errno)); lseek(fd, SEEK_CUR, -total_bytes); return bytes; } total_bytes += bytes; } while (total_bytes < buf_size); if (total_bytes != buf_size) { fprintf(stderr, "Wrote more data(%zu) than buffer size(%zu)\n", total_bytes, buf_size); lseek(fd, SEEK_CUR, -total_bytes); return -1; } return buf_size; } ssize_t write_body(char *output, void *body_offset, ssize_t body_size) { char body_name[PATH_MAX], body_tmp_name[PATH_MAX]; int ret; int fd; ssize_t bytes = -1; /* Create a tmp file and rename it at the end so that make does not get confused if amdfwtool is killed for some unexpected reasons. */ ret = snprintf(body_tmp_name, sizeof(body_tmp_name), "%s%s%s", output, BODY_FILE_SUFFIX, TMP_FILE_SUFFIX); if (ret < 0) { fprintf(stderr, "Error %s forming BODY tmp file name: %d\n", strerror(errno), ret); return -1; } else if ((unsigned int)ret >= sizeof(body_tmp_name)) { fprintf(stderr, "BODY File name %d > %zu\n", ret, sizeof(body_tmp_name)); return -1; } fd = open(body_tmp_name, O_RDWR | O_CREAT | O_TRUNC, 0666); if (fd < 0) { fprintf(stderr, "Error: Opening %s file: %s\n", body_tmp_name, strerror(errno)); return -1; } bytes = write_from_buf_to_file(fd, body_offset, body_size); if (bytes != body_size) { fprintf(stderr, "Error: Writing to file %s failed\n", body_tmp_name); return -1; } close(fd); /* Rename the tmp file */ ret = snprintf(body_name, sizeof(body_name), "%s%s", output, BODY_FILE_SUFFIX); if (ret < 0) { fprintf(stderr, "Error %s forming BODY file name: %d\n", strerror(errno), ret); return -1; } if (rename(body_tmp_name, body_name)) { fprintf(stderr, "Error: renaming file %s to %s\n", body_tmp_name, body_name); return -1; } return bytes; } ssize_t copy_blob(void *dest, const char *src_file, size_t room) { int fd; struct stat fd_stat; ssize_t bytes; fd = open(src_file, O_RDONLY); if (fd < 0) { fprintf(stderr, "Error opening file: %s: %s\n", src_file, strerror(errno)); return -1; } if (fstat(fd, &fd_stat)) { fprintf(stderr, "fstat error: %s\n", strerror(errno)); close(fd); return -2; } if ((size_t)fd_stat.st_size > room) { fprintf(stderr, "Error: %s will not fit. Exiting.\n", src_file); close(fd); return -3; } bytes = read(fd, dest, (size_t)fd_stat.st_size); close(fd); if (bytes != (ssize_t)fd_stat.st_size) { fprintf(stderr, "Error while reading %s\n", src_file); return -4; } return bytes; }