/* Converts string to a JSON string in FBuffer buffer, where only the
* characters required by the JSON standard are JSON escaped. The remaining
* characters (should be UTF8) are just passed through and appended to the
* result. */
static void convert_UTF8_to_JSON(FBuffer *buffer, VALUE string)
{
const char *ptr = RSTRING_PTR(string), *p;
int len = RSTRING_LEN(string), start = 0, end = 0;
const char *escape = NULL;
int escape_len;
unsigned char c;
char buf[6] = { '\\', 'u' };
for (start = 0, end = 0; end < len;) {
p = ptr + end;
c = (unsigned char) *p;
if (c < 0x20) {
switch (c) {
case '\n':
escape = "\\n";
escape_len = 2;
break;
case '\r':
escape = "\\r";
escape_len = 2;
break;
case '\t':
escape = "\\t";
escape_len = 2;
break;
case '\f':
escape = "\\f";
escape_len = 2;
break;
case '\b':
escape = "\\b";
escape_len = 2;
break;
default:
unicode_escape(buf, (UTF16) *p);
escape = buf;
escape_len = 6;
break;
}
} else {
switch (c) {
case '\\':
escape = "\\\\";
escape_len = 2;
break;
case '"':
escape = "\\\"";
escape_len = 2;
break;
default:
end++;
continue;
break;
}
}
fbuffer_append(buffer, ptr + start, end - start);
fbuffer_append(buffer, escape, escape_len);
start = ++end;
escape = NULL;
}
fbuffer_append(buffer, ptr + start, end - start);
}
/* Converts string to a JSON string in FBuffer buffer, where only the
* characters required by the JSON standard are JSON escaped. The remaining
* characters (should be UTF8) are just passed through and appended to the
* result. */
static void convert_UTF8_to_JSON(FBuffer *buffer, VALUE string)
{
const char *ptr = RSTRING_PTR(string), *p;
unsigned long len = RSTRING_LEN(string), start = 0, end = 0;
const char *escape = NULL;
int escape_len;
unsigned char c;
char buf[6] = { '\\', 'u' };
for (start = 0, end = 0; end < len;) {
p = ptr + end;
c = (unsigned char) *p;
if (c < 0x20) {
switch (c) {
case '\n':
escape = "\\n";
escape_len = 2;
break;
case '\r':
escape = "\\r";
escape_len = 2;
break;
case '\t':
escape = "\\t";
escape_len = 2;
break;
case '\f':
escape = "\\f";
escape_len = 2;
break;
case '\b':
escape = "\\b";
escape_len = 2;
break;
default:
unicode_escape(buf, (UTF16) *p);
escape = buf;
escape_len = 6;
break;
}
} else {
switch (c) {
case '\\':
escape = "\\\\";
escape_len = 2;
break;
case '"':
escape = "\\\"";
escape_len = 2;
break;
default:
{
unsigned short clen = trailingBytesForUTF8[c] + 1;
if (end + clen > len) {
rb_raise(rb_path2class("JSON::GeneratorError"),
"partial character in source, but hit end");
}
if (!isLegalUTF8((UTF8 *) p, clen)) {
rb_raise(rb_path2class("JSON::GeneratorError"),
"source sequence is illegal/malformed utf-8");
}
end += clen;
}
continue;
break;
}
}
fbuffer_append(buffer, ptr + start, end - start);
fbuffer_append(buffer, escape, escape_len);
start = ++end;
escape = NULL;
}
fbuffer_append(buffer, ptr + start, end - start);
}
/* Escapes the UTF16 character and stores the result in the buffer buf, then
* the buffer buf іs appended to the FBuffer buffer. */
static void unicode_escape_to_buffer(FBuffer *buffer, char buf[6], UTF16
character)
{
unicode_escape(buf, character);
fbuffer_append(buffer, buf, 6);
}
void JSON_convert_UTF8_to_JSON(VALUE buffer, VALUE string, ConversionFlags flags)
{
char buf[7];
const UTF8* source = (UTF8 *) RSTRING_PTR(string);
const UTF8* sourceEnd = source + RSTRING_LEN(string);
while (source < sourceEnd) {
UTF32 ch = 0;
unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
if (source + extraBytesToRead >= sourceEnd) {
rb_raise(rb_path2class("JSON::GeneratorError"),
"partial character in source, but hit end");
}
if (!isLegalUTF8(source, extraBytesToRead+1)) {
rb_raise(rb_path2class("JSON::GeneratorError"),
"source sequence is illegal/malformed");
}
/*
* The cases all fall through. See "Note A" below.
*/
switch (extraBytesToRead) {
case 5: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */
case 4: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */
case 3: ch += *source++; ch <<= 6;
case 2: ch += *source++; ch <<= 6;
case 1: ch += *source++; ch <<= 6;
case 0: ch += *source++;
}
ch -= offsetsFromUTF8[extraBytesToRead];
if (ch <= UNI_MAX_BMP) { /* Target is a character <= 0xFFFF */
/* UTF-16 surrogate values are illegal in UTF-32 */
if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
if (flags == strictConversion) {
source -= (extraBytesToRead+1); /* return to the illegal value itself */
rb_raise(rb_path2class("JSON::GeneratorError"),
"source sequence is illegal/malformed");
} else {
unicode_escape(buffer, UNI_REPLACEMENT_CHAR);
}
} else {
/* normal case */
if (ch == '"') {
rb_str_buf_cat2(buffer, "\\\"");
} else if (ch == '\\') {
rb_str_buf_cat2(buffer, "\\\\");
} else if (ch == '/') {
rb_str_buf_cat2(buffer, "\\/");
} else if (ch >= 0x20 && ch <= 0x7f) {
rb_str_buf_cat(buffer, (char *) source - 1, 1);
} else if (ch == '\n') {
rb_str_buf_cat2(buffer, "\\n");
} else if (ch == '\r') {
rb_str_buf_cat2(buffer, "\\r");
} else if (ch == '\t') {
rb_str_buf_cat2(buffer, "\\t");
} else if (ch == '\f') {
rb_str_buf_cat2(buffer, "\\f");
} else if (ch == '\b') {
rb_str_buf_cat2(buffer, "\\b");
} else if (ch < 0x20) {
unicode_escape(buffer, (UTF16) ch);
} else {
unicode_escape(buffer, (UTF16) ch);
}
}
} else if (ch > UNI_MAX_UTF16) {
if (flags == strictConversion) {
source -= (extraBytesToRead+1); /* return to the start */
rb_raise(rb_path2class("JSON::GeneratorError"),
"source sequence is illegal/malformed");
} else {
unicode_escape(buffer, UNI_REPLACEMENT_CHAR);
}
} else {
/* target is a character in range 0xFFFF - 0x10FFFF. */
ch -= halfBase;
unicode_escape(buffer, (UTF16)((ch >> halfShift) + UNI_SUR_HIGH_START));
unicode_escape(buffer, (UTF16)((ch & halfMask) + UNI_SUR_LOW_START));
}
}
}
