| | 1 | /**************************************************************************** |
| | 2 | ** |
| | 3 | ** Copyright (C) 2017 Intel Corporation |
| | 4 | ** |
| | 5 | ** Permission is hereby granted, free of charge, to any person obtaining a copy |
| | 6 | ** of this software and associated documentation files (the "Software"), to deal |
| | 7 | ** in the Software without restriction, including without limitation the rights |
| | 8 | ** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| | 9 | ** copies of the Software, and to permit persons to whom the Software is |
| | 10 | ** furnished to do so, subject to the following conditions: |
| | 11 | ** |
| | 12 | ** The above copyright notice and this permission notice shall be included in |
| | 13 | ** all copies or substantial portions of the Software. |
| | 14 | ** |
| | 15 | ** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| | 16 | ** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| | 17 | ** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| | 18 | ** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| | 19 | ** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| | 20 | ** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| | 21 | ** THE SOFTWARE. |
| | 22 | ** |
| | 23 | ****************************************************************************/ |
| | 24 | |
| | 25 | #ifndef CBOR_UTF8_H |
| | 26 | #define CBOR_UTF8_H |
| | 27 | |
| | 28 | #include "compilersupport_p.h" |
| | 29 | |
| | 30 | #include <stdint.h> |
| | 31 | |
| | 32 | static inline uint32_t get_utf8(const uint8_t **buffer, const uint8_t *end) |
| | 33 | { |
| | 34 | int charsNeeded; |
| | 35 | uint32_t uc, min_uc; |
| | 36 | uint8_t b; |
| | 37 | ptrdiff_t n = end - *buffer; |
| | 38 | if (n == 0) |
| | 39 | return ~0U; |
| | 40 | |
| | 41 | uc = *(*buffer)++; |
| | 42 | if (uc < 0x80) { |
| | 43 | /* single-byte UTF-8 */ |
| | 44 | return uc; |
| | 45 | } |
| | 46 | |
| | 47 | /* multi-byte UTF-8, decode it */ |
| | 48 | if (unlikely(uc <= 0xC1)) |
| | 49 | return ~0U; |
| | 50 | if (uc < 0xE0) { |
| | 51 | /* two-byte UTF-8 */ |
| | 52 | charsNeeded = 2; |
| | 53 | min_uc = 0x80; |
| | 54 | uc &= 0x1f; |
| | 55 | } else if (uc < 0xF0) { |
| | 56 | /* three-byte UTF-8 */ |
| | 57 | charsNeeded = 3; |
| | 58 | min_uc = 0x800; |
| | 59 | uc &= 0x0f; |
| | 60 | } else if (uc < 0xF5) { |
| | 61 | /* four-byte UTF-8 */ |
| | 62 | charsNeeded = 4; |
| | 63 | min_uc = 0x10000; |
| | 64 | uc &= 0x07; |
| | 65 | } else { |
| | 66 | return ~0U; |
| | 67 | } |
| | 68 | |
| | 69 | if (n < charsNeeded) |
| | 70 | return ~0U; |
| | 71 | |
| | 72 | /* first continuation character */ |
| | 73 | b = *(*buffer)++; |
| | 74 | if ((b & 0xc0) != 0x80) |
| | 75 | return ~0U; |
| | 76 | uc <<= 6; |
| | 77 | uc |= b & 0x3f; |
| | 78 | |
| | 79 | if (charsNeeded > 2) { |
| | 80 | /* second continuation character */ |
| | 81 | b = *(*buffer)++; |
| | 82 | if ((b & 0xc0) != 0x80) |
| | 83 | return ~0U; |
| | 84 | uc <<= 6; |
| | 85 | uc |= b & 0x3f; |
| | 86 | |
| | 87 | if (charsNeeded > 3) { |
| | 88 | /* third continuation character */ |
| | 89 | b = *(*buffer)++; |
| | 90 | if ((b & 0xc0) != 0x80) |
| | 91 | return ~0U; |
| | 92 | uc <<= 6; |
| | 93 | uc |= b & 0x3f; |
| | 94 | } |
| | 95 | } |
| | 96 | |
| | 97 | /* overlong sequence? surrogate pair? out or range? */ |
| | 98 | if (uc < min_uc || uc - 0xd800U < 2048U || uc > 0x10ffff) |
| | 99 | return ~0U; |
| | 100 | |
| | 101 | return uc; |
| | 102 | } |
| | 103 | |
| | 104 | #endif /* CBOR_UTF8_H */ |
projects / proxmark3-svn / blame_incremental