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https://github.com/RfidResearchGroup/proxmark3.git
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104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/****************************************************************************
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**
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** Copyright (C) 2017 Intel Corporation
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**
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** Permission is hereby granted, free of charge, to any person obtaining a copy
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** of this software and associated documentation files (the "Software"), to deal
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** in the Software without restriction, including without limitation the rights
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** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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** copies of the Software, and to permit persons to whom the Software is
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** furnished to do so, subject to the following conditions:
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**
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** The above copyright notice and this permission notice shall be included in
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** all copies or substantial portions of the Software.
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**
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** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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** THE SOFTWARE.
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**
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****************************************************************************/
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#ifndef CBOR_UTF8_H
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#define CBOR_UTF8_H
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#include "compilersupport_p.h"
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#include <stdint.h>
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static inline uint32_t get_utf8(const uint8_t **buffer, const uint8_t *end)
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{
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int charsNeeded;
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uint32_t uc, min_uc;
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uint8_t b;
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ptrdiff_t n = end - *buffer;
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if (n == 0)
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return ~0U;
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uc = *(*buffer)++;
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if (uc < 0x80) {
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/* single-byte UTF-8 */
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return uc;
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}
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/* multi-byte UTF-8, decode it */
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if (unlikely(uc <= 0xC1))
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return ~0U;
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if (uc < 0xE0) {
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/* two-byte UTF-8 */
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charsNeeded = 2;
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min_uc = 0x80;
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uc &= 0x1f;
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} else if (uc < 0xF0) {
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/* three-byte UTF-8 */
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charsNeeded = 3;
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min_uc = 0x800;
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uc &= 0x0f;
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} else if (uc < 0xF5) {
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/* four-byte UTF-8 */
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charsNeeded = 4;
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min_uc = 0x10000;
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uc &= 0x07;
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} else {
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return ~0U;
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}
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if (n < charsNeeded)
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return ~0U;
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/* first continuation character */
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b = *(*buffer)++;
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if ((b & 0xc0) != 0x80)
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return ~0U;
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uc <<= 6;
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uc |= b & 0x3f;
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if (charsNeeded > 2) {
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/* second continuation character */
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b = *(*buffer)++;
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if ((b & 0xc0) != 0x80)
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return ~0U;
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uc <<= 6;
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uc |= b & 0x3f;
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if (charsNeeded > 3) {
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/* third continuation character */
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b = *(*buffer)++;
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if ((b & 0xc0) != 0x80)
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return ~0U;
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uc <<= 6;
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uc |= b & 0x3f;
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}
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}
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/* overlong sequence? surrogate pair? out or range? */
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if (uc < min_uc || uc - 0xd800U < 2048U || uc > 0x10ffff)
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return ~0U;
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return uc;
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}
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#endif /* CBOR_UTF8_H */
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