Merge commit '2f9f082b5ef3c495c70598ef23383effef675f9a' as 'src/univalue'

5 files changed, 1153 insertions, 0 deletions

diff --git a/src/univalue/lib/.gitignore b/src/univalue/lib/.gitignore
new file mode 100644
index 0000000000..ca8c16dcd4
--- /dev/null
+++ b/src/univalue/lib/.gitignore
@@ -0,0 +1,10 @@
+
+libunivalue-uninstalled.pc
+libunivalue.pc
+libunivalue.a
+gen
+
+.libs
+*.lo
+*.la
+
diff --git a/src/univalue/lib/univalue.cpp b/src/univalue/lib/univalue.cpp
new file mode 100644
index 0000000000..883e8651fe
--- /dev/null
+++ b/src/univalue/lib/univalue.cpp
@@ -0,0 +1,365 @@
+// Copyright 2014 BitPay Inc.
+// Copyright 2015 Bitcoin Core Developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <stdint.h>
+#include <ctype.h>
+#include <errno.h>
+#include <iomanip>
+#include <limits>
+#include <sstream>
+#include <stdexcept>
+#include <stdlib.h>
+#include <string.h>
+
+#include "univalue.h"
+
+namespace 
+{
+static bool ParsePrechecks(const std::string& str)
+{
+    if (str.empty()) // No empty string allowed
+        return false;
+    if (str.size() >= 1 && (isspace(str[0]) || isspace(str[str.size()-1]))) // No padding allowed
+        return false;
+    if (str.size() != strlen(str.c_str())) // No embedded NUL characters allowed
+        return false;
+    return true;
+}
+
+bool ParseInt32(const std::string& str, int32_t *out)
+{
+    if (!ParsePrechecks(str))
+        return false;
+    char *endp = NULL;
+    errno = 0; // strtol will not set errno if valid
+    long int n = strtol(str.c_str(), &endp, 10);
+    if(out) *out = (int32_t)n;
+    // Note that strtol returns a *long int*, so even if strtol doesn't report a over/underflow
+    // we still have to check that the returned value is within the range of an *int32_t*. On 64-bit
+    // platforms the size of these types may be different.
+    return endp && *endp == 0 && !errno &&
+        n >= std::numeric_limits<int32_t>::min() &&
+        n <= std::numeric_limits<int32_t>::max();
+}
+
+bool ParseInt64(const std::string& str, int64_t *out)
+{
+    if (!ParsePrechecks(str))
+        return false;
+    char *endp = NULL;
+    errno = 0; // strtoll will not set errno if valid
+    long long int n = strtoll(str.c_str(), &endp, 10);
+    if(out) *out = (int64_t)n;
+    // Note that strtoll returns a *long long int*, so even if strtol doesn't report a over/underflow
+    // we still have to check that the returned value is within the range of an *int64_t*.
+    return endp && *endp == 0 && !errno &&
+        n >= std::numeric_limits<int64_t>::min() &&
+        n <= std::numeric_limits<int64_t>::max();
+}
+
+bool ParseDouble(const std::string& str, double *out)
+{
+    if (!ParsePrechecks(str))
+        return false;
+    if (str.size() >= 2 && str[0] == '0' && str[1] == 'x') // No hexadecimal floats allowed
+        return false;
+    std::istringstream text(str);
+    text.imbue(std::locale::classic());
+    double result;
+    text >> result;
+    if(out) *out = result;
+    return text.eof() && !text.fail();
+}
+}
+
+using namespace std;
+
+const UniValue NullUniValue;
+
+void UniValue::clear()
+{
+    typ = VNULL;
+    val.clear();
+    keys.clear();
+    values.clear();
+}
+
+bool UniValue::setNull()
+{
+    clear();
+    return true;
+}
+
+bool UniValue::setBool(bool val_)
+{
+    clear();
+    typ = VBOOL;
+    if (val_)
+        val = "1";
+    return true;
+}
+
+static bool validNumStr(const string& s)
+{
+    string tokenVal;
+    unsigned int consumed;
+    enum jtokentype tt = getJsonToken(tokenVal, consumed, s.c_str());
+    return (tt == JTOK_NUMBER);
+}
+
+bool UniValue::setNumStr(const string& val_)
+{
+    if (!validNumStr(val_))
+        return false;
+
+    clear();
+    typ = VNUM;
+    val = val_;
+    return true;
+}
+
+bool UniValue::setInt(uint64_t val)
+{
+    string s;
+    ostringstream oss;
+
+    oss << val;
+
+    return setNumStr(oss.str());
+}
+
+bool UniValue::setInt(int64_t val)
+{
+    string s;
+    ostringstream oss;
+
+    oss << val;
+
+    return setNumStr(oss.str());
+}
+
+bool UniValue::setFloat(double val)
+{
+    string s;
+    ostringstream oss;
+
+    oss << std::setprecision(16) << val;
+
+    bool ret = setNumStr(oss.str());
+    typ = VNUM;
+    return ret;
+}
+
+bool UniValue::setStr(const string& val_)
+{
+    clear();
+    typ = VSTR;
+    val = val_;
+    return true;
+}
+
+bool UniValue::setArray()
+{
+    clear();
+    typ = VARR;
+    return true;
+}
+
+bool UniValue::setObject()
+{
+    clear();
+    typ = VOBJ;
+    return true;
+}
+
+bool UniValue::push_back(const UniValue& val)
+{
+    if (typ != VARR)
+        return false;
+
+    values.push_back(val);
+    return true;
+}
+
+bool UniValue::push_backV(const std::vector<UniValue>& vec)
+{
+    if (typ != VARR)
+        return false;
+
+    values.insert(values.end(), vec.begin(), vec.end());
+
+    return true;
+}
+
+bool UniValue::pushKV(const std::string& key, const UniValue& val)
+{
+    if (typ != VOBJ)
+        return false;
+
+    keys.push_back(key);
+    values.push_back(val);
+    return true;
+}
+
+bool UniValue::pushKVs(const UniValue& obj)
+{
+    if (typ != VOBJ || obj.typ != VOBJ)
+        return false;
+
+    for (unsigned int i = 0; i < obj.keys.size(); i++) {
+        keys.push_back(obj.keys[i]);
+        values.push_back(obj.values[i]);
+    }
+
+    return true;
+}
+
+int UniValue::findKey(const std::string& key) const
+{
+    for (unsigned int i = 0; i < keys.size(); i++) {
+        if (keys[i] == key)
+            return (int) i;
+    }
+
+    return -1;
+}
+
+bool UniValue::checkObject(const std::map<std::string,UniValue::VType>& t)
+{
+    for (std::map<std::string,UniValue::VType>::const_iterator it = t.begin();
+         it != t.end(); it++) {
+        int idx = findKey(it->first);
+        if (idx < 0)
+            return false;
+
+        if (values[idx].getType() != it->second)
+            return false;
+    }
+
+    return true;
+}
+
+const UniValue& UniValue::operator[](const std::string& key) const
+{
+    if (typ != VOBJ)
+        return NullUniValue;
+
+    int index = findKey(key);
+    if (index < 0)
+        return NullUniValue;
+
+    return values[index];
+}
+
+const UniValue& UniValue::operator[](unsigned int index) const
+{
+    if (typ != VOBJ && typ != VARR)
+        return NullUniValue;
+    if (index >= values.size())
+        return NullUniValue;
+
+    return values[index];
+}
+
+const char *uvTypeName(UniValue::VType t)
+{
+    switch (t) {
+    case UniValue::VNULL: return "null";
+    case UniValue::VBOOL: return "bool";
+    case UniValue::VOBJ: return "object";
+    case UniValue::VARR: return "array";
+    case UniValue::VSTR: return "string";
+    case UniValue::VNUM: return "number";
+    }
+
+    // not reached
+    return NULL;
+}
+
+const UniValue& find_value( const UniValue& obj, const std::string& name)
+{
+    for (unsigned int i = 0; i < obj.keys.size(); i++)
+    {
+        if( obj.keys[i] == name )
+        {
+            return obj.values[i];
+        }
+    }
+
+    return NullUniValue;
+}
+
+std::vector<std::string> UniValue::getKeys() const
+{
+    if (typ != VOBJ)
+        throw std::runtime_error("JSON value is not an object as expected");
+    return keys;
+}
+
+std::vector<UniValue> UniValue::getValues() const
+{
+    if (typ != VOBJ && typ != VARR)
+        throw std::runtime_error("JSON value is not an object or array as expected");
+    return values;
+}
+
+bool UniValue::get_bool() const
+{
+    if (typ != VBOOL)
+        throw std::runtime_error("JSON value is not a boolean as expected");
+    return getBool();
+}
+
+std::string UniValue::get_str() const
+{
+    if (typ != VSTR)
+        throw std::runtime_error("JSON value is not a string as expected");
+    return getValStr();
+}
+
+int UniValue::get_int() const
+{
+    if (typ != VNUM)
+        throw std::runtime_error("JSON value is not an integer as expected");
+    int32_t retval;
+    if (!ParseInt32(getValStr(), &retval))
+        throw std::runtime_error("JSON integer out of range");
+    return retval;
+}
+
+int64_t UniValue::get_int64() const
+{
+    if (typ != VNUM)
+        throw std::runtime_error("JSON value is not an integer as expected");
+    int64_t retval;
+    if (!ParseInt64(getValStr(), &retval))
+        throw std::runtime_error("JSON integer out of range");
+    return retval;
+}
+
+double UniValue::get_real() const
+{
+    if (typ != VNUM)
+        throw std::runtime_error("JSON value is not a number as expected");
+    double retval;
+    if (!ParseDouble(getValStr(), &retval))
+        throw std::runtime_error("JSON double out of range");
+    return retval;
+}
+
+const UniValue& UniValue::get_obj() const
+{
+    if (typ != VOBJ)
+        throw std::runtime_error("JSON value is not an object as expected");
+    return *this;
+}
+
+const UniValue& UniValue::get_array() const
+{
+    if (typ != VARR)
+        throw std::runtime_error("JSON value is not an array as expected");
+    return *this;
+}
+
diff --git a/src/univalue/lib/univalue_escapes.h b/src/univalue/lib/univalue_escapes.h
new file mode 100644
index 0000000000..4133b24ca1
--- /dev/null
+++ b/src/univalue/lib/univalue_escapes.h
@@ -0,0 +1,262 @@
+// Automatically generated file. Do not modify.
+#ifndef BITCOIN_UNIVALUE_UNIVALUE_ESCAPES_H
+#define BITCOIN_UNIVALUE_UNIVALUE_ESCAPES_H
+static const char *escapes[256] = {
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	"\\b",
+	"\\t",
+	"\\n",
+	NULL,
+	"\\f",
+	"\\r",
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	"\\\"",
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	"\\\\",
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+};
+#endif // BITCOIN_UNIVALUE_UNIVALUE_ESCAPES_H
diff --git a/src/univalue/lib/univalue_read.cpp b/src/univalue/lib/univalue_read.cpp
new file mode 100644
index 0000000000..64591234cb
--- /dev/null
+++ b/src/univalue/lib/univalue_read.cpp
@@ -0,0 +1,389 @@
+// Copyright 2014 BitPay Inc.
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <string.h>
+#include <vector>
+#include <stdio.h>
+#include "univalue.h"
+
+using namespace std;
+
+// convert hexadecimal string to unsigned integer
+static const char *hatoui(const char *first, const char *last,
+                          unsigned int& out)
+{
+    unsigned int result = 0;
+    for (; first != last; ++first)
+    {
+        int digit;
+        if (isdigit(*first))
+            digit = *first - '0';
+
+        else if (*first >= 'a' && *first <= 'f')
+            digit = *first - 'a' + 10;
+
+        else if (*first >= 'A' && *first <= 'F')
+            digit = *first - 'A' + 10;
+
+        else
+            break;
+
+        result = 16 * result + digit;
+    }
+    out = result;
+
+    return first;
+}
+
+enum jtokentype getJsonToken(string& tokenVal, unsigned int& consumed,
+                            const char *raw)
+{
+    tokenVal.clear();
+    consumed = 0;
+
+    const char *rawStart = raw;
+
+    while ((*raw) && (isspace(*raw)))             // skip whitespace
+        raw++;
+
+    switch (*raw) {
+
+    case 0:
+        return JTOK_NONE;
+
+    case '{':
+        raw++;
+        consumed = (raw - rawStart);
+        return JTOK_OBJ_OPEN;
+    case '}':
+        raw++;
+        consumed = (raw - rawStart);
+        return JTOK_OBJ_CLOSE;
+    case '[':
+        raw++;
+        consumed = (raw - rawStart);
+        return JTOK_ARR_OPEN;
+    case ']':
+        raw++;
+        consumed = (raw - rawStart);
+        return JTOK_ARR_CLOSE;
+
+    case ':':
+        raw++;
+        consumed = (raw - rawStart);
+        return JTOK_COLON;
+    case ',':
+        raw++;
+        consumed = (raw - rawStart);
+        return JTOK_COMMA;
+
+    case 'n':
+    case 't':
+    case 'f':
+        if (!strncmp(raw, "null", 4)) {
+            raw += 4;
+            consumed = (raw - rawStart);
+            return JTOK_KW_NULL;
+        } else if (!strncmp(raw, "true", 4)) {
+            raw += 4;
+            consumed = (raw - rawStart);
+            return JTOK_KW_TRUE;
+        } else if (!strncmp(raw, "false", 5)) {
+            raw += 5;
+            consumed = (raw - rawStart);
+            return JTOK_KW_FALSE;
+        } else
+            return JTOK_ERR;
+
+    case '-':
+    case '0':
+    case '1':
+    case '2':
+    case '3':
+    case '4':
+    case '5':
+    case '6':
+    case '7':
+    case '8':
+    case '9': {
+        // part 1: int
+        string numStr;
+
+        const char *first = raw;
+
+        const char *firstDigit = first;
+        if (!isdigit(*firstDigit))
+            firstDigit++;
+        if ((*firstDigit == '0') && isdigit(firstDigit[1]))
+            return JTOK_ERR;
+
+        numStr += *raw;                       // copy first char
+        raw++;
+
+        if ((*first == '-') && (!isdigit(*raw)))
+            return JTOK_ERR;
+
+        while ((*raw) && isdigit(*raw)) {     // copy digits
+            numStr += *raw;
+            raw++;
+        }
+
+        // part 2: frac
+        if (*raw == '.') {
+            numStr += *raw;                   // copy .
+            raw++;
+
+            if (!isdigit(*raw))
+                return JTOK_ERR;
+            while ((*raw) && isdigit(*raw)) { // copy digits
+                numStr += *raw;
+                raw++;
+            }
+        }
+
+        // part 3: exp
+        if (*raw == 'e' || *raw == 'E') {
+            numStr += *raw;                   // copy E
+            raw++;
+
+            if (*raw == '-' || *raw == '+') { // copy +/-
+                numStr += *raw;
+                raw++;
+            }
+
+            if (!isdigit(*raw))
+                return JTOK_ERR;
+            while ((*raw) && isdigit(*raw)) { // copy digits
+                numStr += *raw;
+                raw++;
+            }
+        }
+
+        tokenVal = numStr;
+        consumed = (raw - rawStart);
+        return JTOK_NUMBER;
+        }
+
+    case '"': {
+        raw++;                                // skip "
+
+        string valStr;
+
+        while (*raw) {
+            if (*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 '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)));
+                    }
+
+                    raw += 4;
+                    break;
+                    }
+                default:
+                    return JTOK_ERR;
+
+                }
+
+                raw++;                        // skip esc'd char
+            }
+
+            else if (*raw == '"') {
+                raw++;                        // skip "
+                break;                        // stop scanning
+            }
+
+            else {
+                valStr += *raw;
+                raw++;
+            }
+        }
+
+        tokenVal = valStr;
+        consumed = (raw - rawStart);
+        return JTOK_STRING;
+        }
+
+    default:
+        return JTOK_ERR;
+    }
+}
+
+bool UniValue::read(const char *raw)
+{
+    clear();
+
+    bool expectName = false;
+    bool expectColon = false;
+    vector<UniValue*> stack;
+
+    string tokenVal;
+    unsigned int consumed;
+    enum jtokentype tok = JTOK_NONE;
+    enum jtokentype last_tok = JTOK_NONE;
+    do {
+        last_tok = tok;
+
+        tok = getJsonToken(tokenVal, consumed, raw);
+        if (tok == JTOK_NONE || tok == JTOK_ERR)
+            return false;
+        raw += consumed;
+
+        switch (tok) {
+
+        case JTOK_OBJ_OPEN:
+        case JTOK_ARR_OPEN: {
+            VType utyp = (tok == JTOK_OBJ_OPEN ? VOBJ : VARR);
+            if (!stack.size()) {
+                if (utyp == VOBJ)
+                    setObject();
+                else
+                    setArray();
+                stack.push_back(this);
+            } else {
+                UniValue tmpVal(utyp);
+                UniValue *top = stack.back();
+                top->values.push_back(tmpVal);
+
+                UniValue *newTop = &(top->values.back());
+                stack.push_back(newTop);
+            }
+
+            if (utyp == VOBJ)
+                expectName = true;
+            break;
+            }
+
+        case JTOK_OBJ_CLOSE:
+        case JTOK_ARR_CLOSE: {
+            if (!stack.size() || expectColon || (last_tok == JTOK_COMMA))
+                return false;
+
+            VType utyp = (tok == JTOK_OBJ_CLOSE ? VOBJ : VARR);
+            UniValue *top = stack.back();
+            if (utyp != top->getType())
+                return false;
+
+            stack.pop_back();
+            expectName = false;
+            break;
+            }
+
+        case JTOK_COLON: {
+            if (!stack.size() || expectName || !expectColon)
+                return false;
+
+            UniValue *top = stack.back();
+            if (top->getType() != VOBJ)
+                return false;
+
+            expectColon = false;
+            break;
+            }
+
+        case JTOK_COMMA: {
+            if (!stack.size() || expectName || expectColon ||
+                (last_tok == JTOK_COMMA) || (last_tok == JTOK_ARR_OPEN))
+                return false;
+
+            UniValue *top = stack.back();
+            if (top->getType() == VOBJ)
+                expectName = true;
+            break;
+            }
+
+        case JTOK_KW_NULL:
+        case JTOK_KW_TRUE:
+        case JTOK_KW_FALSE: {
+            if (!stack.size() || expectName || expectColon)
+                return false;
+
+            UniValue tmpVal;
+            switch (tok) {
+            case JTOK_KW_NULL:
+                // do nothing more
+                break;
+            case JTOK_KW_TRUE:
+                tmpVal.setBool(true);
+                break;
+            case JTOK_KW_FALSE:
+                tmpVal.setBool(false);
+                break;
+            default: /* impossible */ break;
+            }
+
+            UniValue *top = stack.back();
+            top->values.push_back(tmpVal);
+
+            break;
+            }
+
+        case JTOK_NUMBER: {
+            if (!stack.size() || expectName || expectColon)
+                return false;
+
+            UniValue tmpVal(VNUM, tokenVal);
+            UniValue *top = stack.back();
+            top->values.push_back(tmpVal);
+
+            break;
+            }
+
+        case JTOK_STRING: {
+            if (!stack.size())
+                return false;
+
+            UniValue *top = stack.back();
+
+            if (expectName) {
+                top->keys.push_back(tokenVal);
+                expectName = false;
+                expectColon = true;
+            } else {
+                UniValue tmpVal(VSTR, tokenVal);
+                top->values.push_back(tmpVal);
+            }
+
+            break;
+            }
+
+        default:
+            return false;
+        }
+    } while (!stack.empty ());
+
+    /* Check that nothing follows the initial construct (parsed above).  */
+    tok = getJsonToken(tokenVal, consumed, raw);
+    if (tok != JTOK_NONE)
+        return false;
+
+    return true;
+}
+
diff --git a/src/univalue/lib/univalue_write.cpp b/src/univalue/lib/univalue_write.cpp
new file mode 100644
index 0000000000..bce3997af7
--- /dev/null
+++ b/src/univalue/lib/univalue_write.cpp
@@ -0,0 +1,127 @@
+// Copyright 2014 BitPay Inc.
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <ctype.h>
+#include <iomanip>
+#include <sstream>
+#include <stdio.h>
+#include "univalue.h"
+#include "univalue_escapes.h"
+
+// TODO: Using UTF8
+
+using namespace std;
+
+static string json_escape(const string& inS)
+{
+    string outS;
+    outS.reserve(inS.size() * 2);
+
+    for (unsigned int i = 0; i < inS.size(); i++) {
+        unsigned char ch = inS[i];
+        const char *escStr = escapes[ch];
+
+        if (escStr)
+            outS += escStr;
+
+        else if (isprint(ch))
+            outS += ch;
+
+        else {
+            char tmpesc[16];
+            sprintf(tmpesc, "\\u%04x", ch);
+            outS += tmpesc;
+        }
+    }
+
+    return outS;
+}
+
+string UniValue::write(unsigned int prettyIndent,
+                       unsigned int indentLevel) const
+{
+    string s;
+    s.reserve(1024);
+
+    unsigned int modIndent = indentLevel;
+    if (modIndent == 0)
+        modIndent = 1;
+
+    switch (typ) {
+    case VNULL:
+        s += "null";
+        break;
+    case VOBJ:
+        writeObject(prettyIndent, modIndent, s);
+        break;
+    case VARR:
+        writeArray(prettyIndent, modIndent, s);
+        break;
+    case VSTR:
+        s += "\"" + json_escape(val) + "\"";
+        break;
+    case VNUM:
+        s += val;
+        break;
+    case VBOOL:
+        s += (val == "1" ? "true" : "false");
+        break;
+    }
+
+    return s;
+}
+
+static void indentStr(unsigned int prettyIndent, unsigned int indentLevel, string& s)
+{
+    s.append(prettyIndent * indentLevel, ' ');
+}
+
+void UniValue::writeArray(unsigned int prettyIndent, unsigned int indentLevel, string& s) const
+{
+    s += "[";
+    if (prettyIndent)
+        s += "\n";
+
+    for (unsigned int i = 0; i < values.size(); i++) {
+        if (prettyIndent)
+            indentStr(prettyIndent, indentLevel, s);
+        s += values[i].write(prettyIndent, indentLevel + 1);
+        if (i != (values.size() - 1)) {
+            s += ",";
+            if (prettyIndent)
+                s += " ";
+        }
+        if (prettyIndent)
+            s += "\n";
+    }
+
+    if (prettyIndent)
+        indentStr(prettyIndent, indentLevel - 1, s);
+    s += "]";
+}
+
+void UniValue::writeObject(unsigned int prettyIndent, unsigned int indentLevel, string& s) const
+{
+    s += "{";
+    if (prettyIndent)
+        s += "\n";
+
+    for (unsigned int i = 0; i < keys.size(); i++) {
+        if (prettyIndent)
+            indentStr(prettyIndent, indentLevel, s);
+        s += "\"" + json_escape(keys[i]) + "\":";
+        if (prettyIndent)
+            s += " ";
+        s += values[i].write(prettyIndent, indentLevel + 1);
+        if (i != (values.size() - 1))
+            s += ",";
+        if (prettyIndent)
+            s += "\n";
+    }
+
+    if (prettyIndent)
+        indentStr(prettyIndent, indentLevel - 1, s);
+    s += "}";
+}
+