diff options
Diffstat (limited to 'lib9p/internal.h')
| -rw-r--r-- | lib9p/internal.h | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/lib9p/internal.h b/lib9p/internal.h deleted file mode 100644 index 57f7aa7..0000000 --- a/lib9p/internal.h +++ /dev/null @@ -1,179 +0,0 @@ -/* lib9p/internal.h - TODO - * - * Copyright (C) 2024 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 */ - -#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_FIDS - #error config.h must define CONFIG_9P_MAX_FIDS -#endif -#ifndef CONFIG_9P_MAX_REQS - #error config.h must define CONFIG_9P_MAX_REQS -#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); - -/* C language *****************************************************************/ - -#define UNUSED(name) -#define ALWAYS_INLINE [[gnu::always_inline]] inline -#define FLATTEN [[gnu::flatten]] -#define ARRAY_LEN(arr) (sizeof(arr)/sizeof((arr)[0])) -#define CAT2(a, b) a##b -#define CAT3(a, b, c) a##b##c - -/* specialized contexts *******************************************************/ - -struct _validate_ctx { - struct lib9p_ctx *ctx; - uint32_t net_size; - uint8_t *net_bytes; - - 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 { - struct lib9p_ctx *ctx; - uint8_t *net_bytes; - - 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 { - struct lib9p_ctx *ctx; - - uint8_t *net_bytes; - uint32_t net_offset; -}; -typedef bool (*_marshal_fn_t)(struct _marshal_ctx *ctx, void *host_val); - -/* tables *********************************************************************/ - -struct _table_msg { - char *name; - size_t basesize; - _validate_fn_t validate; - _unmarshal_fn_t unmarshal; - _marshal_fn_t marshal; -}; - -struct _table_version { - struct _table_msg msgs[0x100]; -}; - -extern struct _table_version _lib9p_versions[LIB9P_VER_NUM]; - -bool _lib9p_validate_stat(struct _validate_ctx *ctx); -void _lib9p_unmarshal_stat(struct _unmarshal_ctx *ctx, struct lib9p_stat *out); -bool _lib9p_marshal_stat(struct _marshal_ctx *ctx, struct lib9p_stat *val); - -/* unmarshal utilities ********************************************************/ - -ALWAYS_INLINE static uint8_t decode_u8le(uint8_t *in) { - return in[0]; -} -ALWAYS_INLINE static uint16_t decode_u16le(uint8_t *in) { - return (((uint16_t)(in[0])) << 0) - | (((uint16_t)(in[1])) << 8) - ; -} -ALWAYS_INLINE static uint32_t decode_u32le(uint8_t *in) { - return (((uint32_t)(in[0])) << 0) - | (((uint32_t)(in[1])) << 8) - | (((uint32_t)(in[2])) << 16) - | (((uint32_t)(in[3])) << 24) - ; -} -ALWAYS_INLINE static uint64_t decode_u64le(uint8_t *in) { - return (((uint64_t)(in[0])) << 0) - | (((uint64_t)(in[1])) << 8) - | (((uint64_t)(in[2])) << 16) - | (((uint64_t)(in[3])) << 24) - | (((uint64_t)(in[4])) << 32) - | (((uint64_t)(in[5])) << 40) - | (((uint64_t)(in[6])) << 48) - | (((uint64_t)(in[7])) << 56) - ; -} - -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) - -/* marshal utilities **********************************************************/ - -ALWAYS_INLINE static void encode_u8le(uint8_t in, uint8_t *out) { - out[0] = in; -} -ALWAYS_INLINE static void encode_u16le(uint16_t in, uint8_t *out) { - out[0] = (uint8_t)((in >> 0) & 0xFF); - out[1] = (uint8_t)((in >> 8) & 0xFF); -} -ALWAYS_INLINE static void encode_u32le(uint32_t in, uint8_t *out) { - out[0] = (uint8_t)((in >> 0) & 0xFF); - out[1] = (uint8_t)((in >> 8) & 0xFF); - out[2] = (uint8_t)((in >> 16) & 0xFF); - out[3] = (uint8_t)((in >> 24) & 0xFF); -} -ALWAYS_INLINE static void encode_u64le(uint64_t in, uint8_t *out) { - out[0] = (uint8_t)((in >> 0) & 0xFF); - out[1] = (uint8_t)((in >> 8) & 0xFF); - out[2] = (uint8_t)((in >> 16) & 0xFF); - out[3] = (uint8_t)((in >> 24) & 0xFF); - out[4] = (uint8_t)((in >> 32) & 0xFF); - out[5] = (uint8_t)((in >> 40) & 0xFF); - out[6] = (uint8_t)((in >> 48) & 0xFF); - out[7] = (uint8_t)((in >> 56) & 0xFF); -} - -#endif /* _LIB9P_INTERNAL_H_ */ |