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More work on fast entity convert

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Kovid Goyal 2024-09-12 18:49:01 +05:30
parent 8e657a3417
commit 858f047b78
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 51 additions and 11 deletions
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62
src/calibre/ebooks/html_entities.cpp
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@ -13,11 +13,39 @@
#include <frozen/string.h> #include <frozen/string.h>
#include "../utils/cpp_binding.h" #include "../utils/cpp_binding.h"
unsigned int
encode_utf8(uint32_t ch, char* dest) {
if (ch < 0x80) { // only lower 7 bits can be 1
dest[0] = (char)ch; // 0xxxxxxx
return 1;
}
if (ch < 0x800) { // only lower 11 bits can be 1
dest[0] = (ch>>6) | 0xC0; // 110xxxxx
dest[1] = (ch & 0x3F) | 0x80; // 10xxxxxx
return 2;
}
if (ch < 0x10000) { // only lower 16 bits can be 1
dest[0] = (ch>>12) | 0xE0; // 1110xxxx
dest[1] = ((ch>>6) & 0x3F) | 0x80; // 10xxxxxx
dest[2] = (ch & 0x3F) | 0x80; // 10xxxxxx
return 3;
}
if (ch < 0x110000) { // only lower 21 bits can be 1
dest[0] = (ch>>18) | 0xF0; // 11110xxx
dest[1] = ((ch>>12) & 0x3F) | 0x80; // 10xxxxxx
dest[2] = ((ch>>6) & 0x3F) | 0x80; // 10xxxxxx
dest[3] = (ch & 0x3F) | 0x80; // 10xxxxxx
return 4;
}
return 0;
}
static size_t static size_t
add_entity(const char *entity, size_t elen, char *output) { add_entity(const char *entity, size_t elen, char *output) {
size_t ans = 0; size_t ans = 0;
char e[64]; char e[64];
if (elen > sizeof(e) - 1) { if (elen > sizeof(e) - 1) {
bad_entity:
output[ans++] = '&'; output[ans++] = '&';
memcpy(output + ans, entity, elen); memcpy(output + ans, entity, elen);
ans += elen; ans += elen;
@ -30,7 +58,24 @@ add_entity(const char *entity, size_t elen, char *output) {
return ans; return ans;
} }
memcpy(e, entity, elen); memcpy(e, entity, elen);
unsigned long codepoint = ULONG_MAX;
e[elen] = 0; e[elen] = 0;
if (e[0] == '#') {
if (elen > 1) {
char *end;
if (e[1] == 'x' || e[1] == 'X') {
errno = 0;
codepoint = strtoul(e + 2, &end, 16);
if (errno || *end) goto bad_entity;
} else {
errno = 0;
codepoint = strtoul(e + 1, &end, 10);
if (errno || *end) goto bad_entity;
}
if (codepoint <= 1114111ul) return encode_utf8(codepoint, output);
}
} else {
}
return 0; return 0;
} }
@ -41,17 +86,12 @@ process_entity(const char *input, size_t input_sz, char *output, size_t *output_
size_t input_pos = 0; size_t input_pos = 0;
while (input_pos < input_sz) { while (input_pos < input_sz) {
char ch = input[input_pos++]; char ch = input[input_pos++];
switch (ch) { if (('a' <= ch && ch <= 'z') || ('A' <= ch && ch <= 'Z') || ('0' <= ch && ch <= '9') || (ch == '#' && input_pos == 1));
case 'a' ... 'z': case 'A' ... 'Z': case '0' ... '9': case '#': case '_': case '-': case '+': else if (ch == ';') *output_pos += add_entity(input, input_pos-1, output + *output_pos);
break; else {
case ';': output[(*output_pos)++] = '&';
*output_pos += add_entity(input, input_pos-1, output + *output_pos); memcpy(output + *output_pos, input, input_pos);
break; *output_pos += input_pos;
default:
output[(*output_pos)++] = '&';
memcpy(output + *output_pos, input, input_pos);
*output_pos += input_pos;
break;
} }
} }
return input_pos; return input_pos;