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-rw-r--r--src/univalue/lib/univalue_read.cpp37
-rw-r--r--src/univalue/lib/univalue_utffilter.h119
-rw-r--r--src/univalue/lib/univalue_write.cpp11
3 files changed, 135 insertions, 32 deletions
diff --git a/src/univalue/lib/univalue_read.cpp b/src/univalue/lib/univalue_read.cpp
index c7516b9628..95bac6958d 100644
--- a/src/univalue/lib/univalue_read.cpp
+++ b/src/univalue/lib/univalue_read.cpp
@@ -6,6 +6,7 @@
#include <vector>
#include <stdio.h>
#include "univalue.h"
+#include "univalue_utffilter.h"
using namespace std;
@@ -174,41 +175,31 @@ enum jtokentype getJsonToken(string& tokenVal, unsigned int& consumed,
raw++; // skip "
string valStr;
+ JSONUTF8StringFilter writer(valStr);
while (*raw) {
- if (*raw < 0x20)
+ if ((unsigned char)*raw < 0x20)
return JTOK_ERR;
else if (*raw == '\\') {
raw++; // skip backslash
switch (*raw) {
- case '"': valStr += "\""; break;
- case '\\': valStr += "\\"; break;
- case '/': valStr += "/"; break;
- case 'b': valStr += "\b"; break;
- case 'f': valStr += "\f"; break;
- case 'n': valStr += "\n"; break;
- case 'r': valStr += "\r"; break;
- case 't': valStr += "\t"; break;
+ case '"': writer.push_back('\"'); break;
+ case '\\': writer.push_back('\\'); break;
+ case '/': writer.push_back('/'); break;
+ case 'b': writer.push_back('\b'); break;
+ case 'f': writer.push_back('\f'); break;
+ case 'n': writer.push_back('\n'); break;
+ case 'r': writer.push_back('\r'); break;
+ case 't': writer.push_back('\t'); break;
case 'u': {
unsigned int codepoint;
if (hatoui(raw + 1, raw + 1 + 4, codepoint) !=
raw + 1 + 4)
return JTOK_ERR;
-
- if (codepoint <= 0x7f)
- valStr.push_back((char)codepoint);
- else if (codepoint <= 0x7FF) {
- valStr.push_back((char)(0xC0 | (codepoint >> 6)));
- valStr.push_back((char)(0x80 | (codepoint & 0x3F)));
- } else if (codepoint <= 0xFFFF) {
- valStr.push_back((char)(0xE0 | (codepoint >> 12)));
- valStr.push_back((char)(0x80 | ((codepoint >> 6) & 0x3F)));
- valStr.push_back((char)(0x80 | (codepoint & 0x3F)));
- }
-
+ writer.push_back_u(codepoint);
raw += 4;
break;
}
@@ -226,11 +217,13 @@ enum jtokentype getJsonToken(string& tokenVal, unsigned int& consumed,
}
else {
- valStr += *raw;
+ writer.push_back(*raw);
raw++;
}
}
+ if (!writer.finalize())
+ return JTOK_ERR;
tokenVal = valStr;
consumed = (raw - rawStart);
return JTOK_STRING;
diff --git a/src/univalue/lib/univalue_utffilter.h b/src/univalue/lib/univalue_utffilter.h
new file mode 100644
index 0000000000..0e330dce9c
--- /dev/null
+++ b/src/univalue/lib/univalue_utffilter.h
@@ -0,0 +1,119 @@
+// Copyright 2016 Wladimir J. van der Laan
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#ifndef UNIVALUE_UTFFILTER_H
+#define UNIVALUE_UTFFILTER_H
+
+#include <string>
+
+/**
+ * Filter that generates and validates UTF-8, as well as collates UTF-16
+ * surrogate pairs as specified in RFC4627.
+ */
+class JSONUTF8StringFilter
+{
+public:
+ JSONUTF8StringFilter(std::string &s):
+ str(s), is_valid(true), codepoint(0), state(0), surpair(0)
+ {
+ }
+ // Write single 8-bit char (may be part of UTF-8 sequence)
+ void push_back(unsigned char ch)
+ {
+ if (state == 0) {
+ if (ch < 0x80) // 7-bit ASCII, fast direct pass-through
+ str.push_back(ch);
+ else if (ch < 0xc0) // Mid-sequence character, invalid in this state
+ is_valid = false;
+ else if (ch < 0xe0) { // Start of 2-byte sequence
+ codepoint = (ch & 0x1f) << 6;
+ state = 6;
+ } else if (ch < 0xf0) { // Start of 3-byte sequence
+ codepoint = (ch & 0x0f) << 12;
+ state = 12;
+ } else if (ch < 0xf8) { // Start of 4-byte sequence
+ codepoint = (ch & 0x07) << 18;
+ state = 18;
+ } else // Reserved, invalid
+ is_valid = false;
+ } else {
+ if ((ch & 0xc0) != 0x80) // Not a continuation, invalid
+ is_valid = false;
+ state -= 6;
+ codepoint |= (ch & 0x3f) << state;
+ if (state == 0)
+ push_back_u(codepoint);
+ }
+ }
+ // Write codepoint directly, possibly collating surrogate pairs
+ void push_back_u(unsigned int codepoint)
+ {
+ if (state) // Only accept full codepoints in open state
+ is_valid = false;
+ if (codepoint >= 0xD800 && codepoint < 0xDC00) { // First half of surrogate pair
+ if (surpair) // Two subsequent surrogate pair openers - fail
+ is_valid = false;
+ else
+ surpair = codepoint;
+ } else if (codepoint >= 0xDC00 && codepoint < 0xE000) { // Second half of surrogate pair
+ if (surpair) { // Open surrogate pair, expect second half
+ // Compute code point from UTF-16 surrogate pair
+ append_codepoint(0x10000 | ((surpair - 0xD800)<<10) | (codepoint - 0xDC00));
+ surpair = 0;
+ } else // Second half doesn't follow a first half - fail
+ is_valid = false;
+ } else {
+ if (surpair) // First half of surrogate pair not followed by second - fail
+ is_valid = false;
+ else
+ append_codepoint(codepoint);
+ }
+ }
+ // Check that we're in a state where the string can be ended
+ // No open sequences, no open surrogate pairs, etc
+ bool finalize()
+ {
+ if (state || surpair)
+ is_valid = false;
+ return is_valid;
+ }
+private:
+ std::string &str;
+ bool is_valid;
+ // Current UTF-8 decoding state
+ unsigned int codepoint;
+ int state; // Top bit to be filled in for next UTF-8 byte, or 0
+
+ // Keep track of the following state to handle the following section of
+ // RFC4627:
+ //
+ // To escape an extended character that is not in the Basic Multilingual
+ // Plane, the character is represented as a twelve-character sequence,
+ // encoding the UTF-16 surrogate pair. So, for example, a string
+ // containing only the G clef character (U+1D11E) may be represented as
+ // "\uD834\uDD1E".
+ //
+ // Two subsequent \u.... may have to be replaced with one actual codepoint.
+ unsigned int surpair; // First half of open UTF-16 surrogate pair, or 0
+
+ void append_codepoint(unsigned int codepoint)
+ {
+ if (codepoint <= 0x7f)
+ str.push_back((char)codepoint);
+ else if (codepoint <= 0x7FF) {
+ str.push_back((char)(0xC0 | (codepoint >> 6)));
+ str.push_back((char)(0x80 | (codepoint & 0x3F)));
+ } else if (codepoint <= 0xFFFF) {
+ str.push_back((char)(0xE0 | (codepoint >> 12)));
+ str.push_back((char)(0x80 | ((codepoint >> 6) & 0x3F)));
+ str.push_back((char)(0x80 | (codepoint & 0x3F)));
+ } else if (codepoint <= 0x1FFFFF) {
+ str.push_back((char)(0xF0 | (codepoint >> 18)));
+ str.push_back((char)(0x80 | ((codepoint >> 12) & 0x3F)));
+ str.push_back((char)(0x80 | ((codepoint >> 6) & 0x3F)));
+ str.push_back((char)(0x80 | (codepoint & 0x3F)));
+ }
+ }
+};
+
+#endif
diff --git a/src/univalue/lib/univalue_write.cpp b/src/univalue/lib/univalue_write.cpp
index ceb4cc9166..cfbdad3284 100644
--- a/src/univalue/lib/univalue_write.cpp
+++ b/src/univalue/lib/univalue_write.cpp
@@ -8,8 +8,6 @@
#include "univalue.h"
#include "univalue_escapes.h"
-// TODO: Using UTF8
-
using namespace std;
static string json_escape(const string& inS)
@@ -23,15 +21,8 @@ static string json_escape(const string& inS)
if (escStr)
outS += escStr;
-
- else if (ch < 0x80)
+ else
outS += ch;
-
- else { // TODO handle UTF-8 properly
- char tmpesc[16];
- sprintf(tmpesc, "\\u%04x", ch);
- outS += tmpesc;
- }
}
return outS;
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-10 08:56:57 +0000