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// vim:sw=2:ai
/*
* Copyright (C) 2010 DeNA Co.,Ltd.. All rights reserved.
* See COPYRIGHT.txt for details.
*/
#include <stdio.h>
#include "escape.hpp"
#include "string_buffer.hpp"
#include "fatal.hpp"
#include "string_util.hpp"
#define DBG_OP(x)
#define DBG_BUF(x)
namespace dena {
enum special_char_t {
special_char_escape_prefix = 0x01, /* SOH */
special_char_noescape_min = 0x10, /* DLE */
special_char_escape_shift = 0x40, /* '@' */
};
void
escape_string(char *& wp, const char *start, const char *finish)
{
while (start != finish) {
const unsigned char c = *start;
if (c >= special_char_noescape_min) {
wp[0] = c; /* no need to escape */
} else {
wp[0] = special_char_escape_prefix;
++wp;
wp[0] = c + special_char_escape_shift;
}
++start;
++wp;
}
}
void
escape_string(string_buffer& ar, const char *start, const char *finish)
{
const size_t buflen = (finish - start) * 2;
char *const wp_begin = ar.make_space(buflen);
char *wp = wp_begin;
escape_string(wp, start, finish);
ar.space_wrote(wp - wp_begin);
}
bool
unescape_string(char *& wp, const char *start, const char *finish)
{
/* works even if wp == start */
while (start != finish) {
const unsigned char c = *start;
if (c != special_char_escape_prefix) {
wp[0] = c;
} else if (start + 1 != finish) {
++start;
const unsigned char cn = *start;
if (cn < special_char_escape_shift) {
return false;
}
wp[0] = cn - special_char_escape_shift;
} else {
return false;
}
++start;
++wp;
}
return true;
}
bool
unescape_string(string_buffer& ar, const char *start, const char *finish)
{
const size_t buflen = finish - start;
char *const wp_begin = ar.make_space(buflen);
char *wp = wp_begin;
const bool r = unescape_string(wp, start, finish);
ar.space_wrote(wp - wp_begin);
return r;
}
uint32_t
read_ui32(char *& start, char *finish)
{
char *const n_begin = start;
read_token(start, finish);
char *const n_end = start;
uint32_t v = 0;
for (char *p = n_begin; p != n_end; ++p) {
const char ch = p[0];
if (ch >= '0' && ch <= '9') {
v *= 10;
v += (ch - '0');
}
}
return v;
}
void
write_ui32(string_buffer& buf, uint32_t v)
{
char *wp = buf.make_space(12);
int len = snprintf(wp, 12, "%u", v);
if (len > 0) {
buf.space_wrote(len);
}
}
void
write_ui64(string_buffer& buf, uint64_t v)
{
char *wp = buf.make_space(22);
int len = snprintf(wp, 22, "%llu", static_cast<unsigned long long>(v));
if (len > 0) {
buf.space_wrote(len);
}
}
};
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