| /* 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; |
| } |