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-rw-r--r--src/univalue/lib/univalue_read.cpp389
1 files changed, 389 insertions, 0 deletions
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;
+}
+
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