diff options
Diffstat (limited to '9p/internal.h')
| -rw-r--r-- | 9p/internal.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/9p/internal.h b/9p/internal.h new file mode 100644 index 0000000..1bc0e92 --- /dev/null +++ b/9p/internal.h @@ -0,0 +1,114 @@ +/* 9p/internal.h - TODO + * + * Copyright (C) 2024 Luke T. Shumaker <lukeshu@lukeshu.com> + * SPDX-Licence-Identifier: AGPL-3.0-or-later + */ + +#ifndef _9P_INTERNAL_H_ +#define _9P_INTERNAL_H_ + +#include <stdint.h> +#include <stdbool.h> + +#include "9p/defs.h" + +/* C language *****************************************************************/ + +#define UNUSED(name) /* name __attribute__ ((unused)) */ + +/* vtables ********************************************************************/ + +typedef bool (*_checksize_fn_t)(uint32_t net_len, uint8_t *net_bytes, uint32_t *mut_net_offset, size_t *mut_host_extra); +typedef bool (*_unmarshal_fn_t)(uint8_t *net_bytes, uint32_t *mut_net_offset, void **mut_host_extra, void *out); +typedef bool (*_marshal_fn_t)(struct p9_ctx *ctx, void *val, uint8_t *out_net_bytes, uint32_t *mut_net_offset); + +struct msg_vtable { + size_t unmarshal_basesize; + _checksize_fn_t unmarshal_extrasize; + _unmarshal_fn_t unmarshal; + _marshal_fn_t marshal; +}; + +struct version { + struct msg_vtable msgs[0xFF]; +}; + +extern struct version version_9P2000; +/*extern struct version version_9P2000u; */ + +/* unmarshal utilities ********************************************************/ + +static inline uint8_t decode_u8le(uint8_t *in) { + return in[0]; +} +static inline uint16_t decode_u16le(uint8_t *in) { + return (((uint16_t)(in[0])) << 0) + | (((uint16_t)(in[1])) << 8) + ; +} +static inline 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) + ; +} +static inline 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_without_nul(uint8_t *str, size_t len) { + uint8_t mask; + uint8_t chlen; + for (size_t pos = 0; pos < len;) { + if ((str[pos] & 0b10000000) == 0b00000000) { mask = 0b01111111; chlen = 1; } + else if ((str[pos] & 0b11100000) == 0b11000000) { mask = 0b00011111; chlen = 2; } + else if ((str[pos] & 0b11110000) == 0b11100000) { mask = 0b00001111; chlen = 3; } + else if ((str[pos] & 0b11111000) == 0b11110000) { mask = 0b00000111; chlen = 4; } + else return false; + if (pos + chlen > len || (str[pos] & mask) == 0) return false; + switch (chlen) { + case 4: if ((str[pos+3] & 0b11000000) != 0b10000000) return false; /* fallthrough */ + case 3: if ((str[pos+2] & 0b11000000) != 0b10000000) return false; /* fallthrough */ + case 2: if ((str[pos+1] & 0b11000000) != 0b10000000) return false; /* fallthrough */ + } + pos += chlen; + } + return true; +} + +/* marshal utilities **********************************************************/ + +static inline void encode_u8le(uint8_t in, uint8_t *out) { + out[0] = in; +} +static inline void encode_u16le(uint16_t in, uint8_t *out) { + out[0] = (uint8_t)((in >> 0) & 0xFF); + out[1] = (uint8_t)((in >> 8) & 0xFF); +} +static inline 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); +} +static inline 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 /* _9P_INTERNAL_H_ */ |