184 lines
4.0 KiB
C
184 lines
4.0 KiB
C
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#include "config.h"
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#include "unicode.h"
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#include <stddef.h>
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size_t guac_utf8_charsize(unsigned char c) {
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/* Determine size in bytes of character */
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if ((c | 0x7F) == 0x7F) return 1;
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if ((c | 0x1F) == 0xDF) return 2;
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if ((c | 0x0F) == 0xEF) return 3;
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if ((c | 0x07) == 0xF7) return 4;
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/* Default to one character */
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return 1;
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}
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size_t guac_utf8_strlen(const char* str) {
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/* The current length of the string */
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int length = 0;
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/* Number of characters before start of next character */
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int skip = 0;
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while (*str != 0) {
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/* If skipping, then skip */
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if (skip > 0) skip--;
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/* Otherwise, determine next skip value, and increment length */
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else {
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/* Get next character */
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unsigned char c = (unsigned char) *str;
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/* Determine skip value (size in bytes of rest of character) */
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skip = guac_utf8_charsize(c) - 1;
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length++;
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}
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str++;
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}
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return length;
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}
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int guac_utf8_write(int codepoint, char* utf8, int length) {
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int i;
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int mask, bytes;
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/* If not even one byte, cannot write */
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if (length <= 0)
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return 0;
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/* Determine size and initial byte mask */
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if (codepoint <= 0x007F) {
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mask = 0x00;
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bytes = 1;
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}
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else if (codepoint <= 0x7FF) {
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mask = 0xC0;
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bytes = 2;
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}
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else if (codepoint <= 0xFFFF) {
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mask = 0xE0;
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bytes = 3;
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}
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else if (codepoint <= 0x1FFFFF) {
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mask = 0xF0;
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bytes = 4;
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}
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/* Otherwise, invalid codepoint */
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else {
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*(utf8++) = '?';
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return 1;
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}
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/* If not enough room, don't write anything */
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if (bytes > length)
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return 0;
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/* Offset buffer by size */
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utf8 += bytes - 1;
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/* Add trailing bytes, if any */
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for (i=1; i<bytes; i++) {
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*(utf8--) = 0x80 | (codepoint & 0x3F);
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codepoint >>= 6;
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}
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/* Set initial byte */
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*utf8 = mask | codepoint;
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/* Done */
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return bytes;
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}
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int guac_utf8_read(const char* utf8, int length, int* codepoint) {
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unsigned char initial;
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int bytes;
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int result;
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int i;
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/* If not even one byte, cannot read */
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if (length <= 0)
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return 0;
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/* Read initial byte */
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initial = (unsigned char) *(utf8++);
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/* 0xxxxxxx */
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if ((initial | 0x7F) == 0x7F) {
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result = initial;
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bytes = 1;
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}
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/* 110xxxxx 10xxxxxx */
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else if ((initial | 0x1F) == 0xDF) {
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result = initial & 0x1F;
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bytes = 2;
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}
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/* 1110xxxx 10xxxxxx 10xxxxxx */
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else if ((initial | 0x0F) == 0xEF) {
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result = initial & 0x0F;
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bytes = 3;
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}
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/* 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */
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else if ((initial | 0x07) == 0xF7) {
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result = initial & 0x07;
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bytes = 4;
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}
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/* Otherwise, invalid codepoint */
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else {
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*codepoint = 0xFFFD; /* Replacement character */
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return 1;
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}
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/* If not enough room, don't read anything */
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if (bytes > length)
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return 0;
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/* Read trailing bytes, if any */
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for (i=1; i<bytes; i++) {
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result <<= 6;
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result |= *(utf8++) & 0x3F;
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}
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*codepoint = result;
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return bytes;
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}
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