static int file_check(URLContext *h, int mask) { #if HAVE_ACCESS && defined(R_OK) int ret = 0; if (access(h->filename, F_OK) < 0) return AVERROR(errno); if (mask&AVIO_FLAG_READ) if (access(h->filename, R_OK) >= 0) ret |= AVIO_FLAG_READ; if (mask&AVIO_FLAG_WRITE) if (access(h->filename, W_OK) >= 0) ret |= AVIO_FLAG_WRITE; #else struct stat st; int ret = stat(h->filename, &st); if (ret < 0) return AVERROR(errno); ret |= st.st_mode&S_IRUSR ? mask&AVIO_FLAG_READ : 0; ret |= st.st_mode&S_IWUSR ? mask&AVIO_FLAG_WRITE : 0; #endif return ret; }