diff options
Diffstat (limited to 'lib9p/internal.h')
| -rw-r--r-- | lib9p/internal.h | 129 |
1 files changed, 0 insertions, 129 deletions
diff --git a/lib9p/internal.h b/lib9p/internal.h deleted file mode 100644 index 801dc4c..0000000 --- a/lib9p/internal.h +++ /dev/null @@ -1,129 +0,0 @@ -/* lib9p/internal.h - Internal machinery shared between parts of lib9p - * - * Copyright (C) 2024-2025 Luke T. Shumaker <lukeshu@lukeshu.com> - * SPDX-License-Identifier: AGPL-3.0-or-later - */ - -#ifndef _LIB9P_INTERNAL_H_ -#define _LIB9P_INTERNAL_H_ - -#include <stddef.h> /* for size_t */ -#include <limits.h> /* for SSIZE_MAX, not set by newlib */ -#ifndef SSIZE_MAX -#define SSIZE_MAX (SIZE_MAX >> 1) -#endif - -#include <libmisc/endian.h> -#include <libmisc/macro.h> - -#include <lib9p/9p.h> - -/* configuration **************************************************************/ - -#include "config.h" - -#ifndef CONFIG_9P_MAX_MSG_SIZE - #error config.h must define CONFIG_9P_MAX_MSG_SIZE -#endif -#ifndef CONFIG_9P_MAX_HOSTMSG_SIZE - #error config.h must define CONFIG_9P_MAX_HOSTMSG_SIZE -#endif -#ifndef CONFIG_9P_MAX_ERR_SIZE - #error config.h must define CONFIG_9P_MAX_ERR_SIZE -#endif - -static_assert(CONFIG_9P_MAX_ERR_SIZE <= UINT16_MAX); -static_assert(CONFIG_9P_MAX_MSG_SIZE <= CONFIG_9P_MAX_HOSTMSG_SIZE); -static_assert(CONFIG_9P_MAX_HOSTMSG_SIZE <= SSIZE_MAX); - -/* specialized contexts *******************************************************/ - -struct _validate_ctx { - /* input */ - struct lib9p_ctx *ctx; - uint32_t net_size; - uint8_t *net_bytes; - - /* output */ - uint32_t net_offset; - /* Increment `host_extra` to pre-allocate space that is - * "extra" beyond sizeof(). */ - size_t host_extra; -}; -typedef bool (*_validate_fn_t)(struct _validate_ctx *ctx); - -struct _unmarshal_ctx { - /* input */ - struct lib9p_ctx *ctx; - uint8_t *net_bytes; - - /* output */ - uint32_t net_offset; - /* `extra` points to the beginning of unallocated space. */ - void *extra; -}; -typedef void (*_unmarshal_fn_t)(struct _unmarshal_ctx *ctx, void *out); - -struct _marshal_ctx { - /* input */ - struct lib9p_ctx *ctx; - - /* output */ - size_t net_iov_cnt; - struct iovec *net_iov; - size_t net_copied_size; - uint8_t *net_copied; -}; -typedef bool (*_marshal_fn_t)(struct _marshal_ctx *ctx, void *host_val); - -/* tables / exports ***********************************************************/ - -struct _lib9p_recv_tentry { - size_t basesize; - _validate_fn_t validate; - _unmarshal_fn_t unmarshal; -}; - -struct _lib9p_send_tentry { - _marshal_fn_t marshal; -}; - -extern const char *const _lib9p_table_ver_name[LIB9P_VER_NUM]; -extern const char *const _lib9p_table_msg_name[LIB9P_VER_NUM][0x100]; -extern const uint32_t _lib9p_table_msg_min_size[LIB9P_VER_NUM]; -extern const struct _lib9p_recv_tentry _lib9p_table_Tmsg_recv[LIB9P_VER_NUM][0x80]; -extern const struct _lib9p_recv_tentry _lib9p_table_Rmsg_recv[LIB9P_VER_NUM][0x80]; -extern const struct _lib9p_send_tentry _lib9p_table_Tmsg_send[LIB9P_VER_NUM][0x80]; -extern const struct _lib9p_send_tentry _lib9p_table_Rmsg_send[LIB9P_VER_NUM][0x80]; - -bool _lib9p_stat_validate(struct _validate_ctx *ctx); -void _lib9p_stat_unmarshal(struct _unmarshal_ctx *ctx, struct lib9p_stat *out); -bool _lib9p_stat_marshal(struct _marshal_ctx *ctx, struct lib9p_stat *val); - -/* unmarshal utilities ********************************************************/ - -static inline bool _is_valid_utf8(uint8_t *str, size_t len, bool forbid_nul) { - uint32_t ch; - uint8_t chlen; - assert(str); - for (size_t pos = 0; pos < len;) { - if ((str[pos] & 0b10000000) == 0b00000000) { ch = str[pos] & 0b01111111; chlen = 1; } - else if ((str[pos] & 0b11100000) == 0b11000000) { ch = str[pos] & 0b00011111; chlen = 2; } - else if ((str[pos] & 0b11110000) == 0b11100000) { ch = str[pos] & 0b00001111; chlen = 3; } - else if ((str[pos] & 0b11111000) == 0b11110000) { ch = str[pos] & 0b00000111; chlen = 4; } - else return false; - if ((ch == 0 && (chlen != 1 || forbid_nul)) || pos + chlen > len) return false; - for (uint8_t i = 1; i < chlen; i++) { - if ((str[pos+i] & 0b11000000) != 0b10000000) return false; - ch = (ch << 6) | (str[pos+i] & 0b00111111); - } - if (ch > 0x10FFFF) return false; - pos += chlen; - } - return true; -} - -#define is_valid_utf8(str, len) _is_valid_utf8(str, len, false) -#define is_valid_utf8_without_nul(str, len) _is_valid_utf8(str, len, true) - -#endif /* _LIB9P_INTERNAL_H_ */ |