Add json.[ch], update debian/copyright with license info.

1 files changed, 742 insertions, 0 deletions

diff --git a/lib/json.c b/lib/json.c
new file mode 100644
index 00000000..e37c83fa
--- /dev/null
+++ b/lib/json.c
@@ -0,0 +1,742 @@
+
+/* vim: set et ts=3 sw=3 ft=c:
+ *
+ * Copyright (C) 2012 James McLaughlin et al.  All rights reserved.
+ * https://github.com/udp/json-parser
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "json.h"
+
+#ifdef _MSC_VER
+   #ifndef _CRT_SECURE_NO_WARNINGS
+      #define _CRT_SECURE_NO_WARNINGS
+   #endif
+#endif
+
+#ifdef __cplusplus
+   const struct _json_value json_value_none; /* zero-d by ctor */
+#else
+   const struct _json_value json_value_none = { 0 };
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+typedef unsigned short json_uchar;
+
+static unsigned char hex_value (json_char c)
+{
+   if (c >= 'A' && c <= 'F')
+      return (c - 'A') + 10;
+
+   if (c >= 'a' && c <= 'f')
+      return (c - 'a') + 10;
+
+   if (c >= '0' && c <= '9')
+      return c - '0';
+
+   return 0xFF;
+}
+
+typedef struct
+{
+   json_settings settings;
+   int first_pass;
+
+   unsigned long used_memory;
+
+   unsigned int uint_max;
+   unsigned long ulong_max;
+
+} json_state;
+
+static void * json_alloc (json_state * state, unsigned long size, int zero)
+{
+   void * mem;
+
+   if ((state->ulong_max - state->used_memory) < size)
+      return 0;
+
+   if (state->settings.max_memory
+         && (state->used_memory += size) > state->settings.max_memory)
+   {
+      return 0;
+   }
+
+   if (! (mem = zero ? calloc (size, 1) : malloc (size)))
+      return 0;
+
+   return mem;
+}
+
+static int new_value
+   (json_state * state, json_value ** top, json_value ** root, json_value ** alloc, json_type type)
+{
+   json_value * value;
+   int values_size;
+
+   if (!state->first_pass)
+   {
+      value = *top = *alloc;
+      *alloc = (*alloc)->_reserved.next_alloc;
+
+      if (!*root)
+         *root = value;
+
+      switch (value->type)
+      {
+         case json_array:
+
+            if (! (value->u.array.values = (json_value **) json_alloc
+               (state, value->u.array.length * sizeof (json_value *), 0)) )
+            {
+               return 0;
+            }
+
+            break;
+
+         case json_object:
+
+            values_size = sizeof (*value->u.object.values) * value->u.object.length;
+
+            if (! ((*(void **) &value->u.object.values) = json_alloc
+                  (state, values_size + ((unsigned long) value->u.object.values), 0)) )
+            {
+               return 0;
+            }
+
+            value->_reserved.object_mem = (*(char **) &value->u.object.values) + values_size;
+
+            break;
+
+         case json_string:
+
+            if (! (value->u.string.ptr = (json_char *) json_alloc
+               (state, (value->u.string.length + 1) * sizeof (json_char), 0)) )
+            {
+               return 0;
+            }
+
+            break;
+
+         default:
+            break;
+      };
+
+      value->u.array.length = 0;
+
+      return 1;
+   }
+
+   value = (json_value *) json_alloc (state, sizeof (json_value), 1);
+
+   if (!value)
+      return 0;
+
+   if (!*root)
+      *root = value;
+
+   value->type = type;
+   value->parent = *top;
+
+   if (*alloc)
+      (*alloc)->_reserved.next_alloc = value;
+
+   *alloc = *top = value;
+
+   return 1;
+}
+
+#define e_off \
+   ((int) (i - cur_line_begin))
+
+#define whitespace \
+   case '\n': ++ cur_line;  cur_line_begin = i; \
+   case ' ': case '\t': case '\r'
+
+#define string_add(b)  \
+   do { if (!state.first_pass) string [string_length] = b;  ++ string_length; } while (0);
+
+const static int
+   flag_next = 1, flag_reproc = 2, flag_need_comma = 4, flag_seek_value = 8, flag_exponent = 16,
+   flag_got_exponent_sign = 32, flag_escaped = 64, flag_string = 128, flag_need_colon = 256,
+   flag_done = 512;
+
+json_value * json_parse_ex (json_settings * settings, const json_char * json, char * error_buf)
+{
+   json_char error [128];
+   unsigned int cur_line;
+   const json_char * cur_line_begin, * i;
+   json_value * top, * root, * alloc = 0;
+   json_state state;
+   int flags;
+
+   error[0] = '\0';
+
+   memset (&state, 0, sizeof (json_state));
+   memcpy (&state.settings, settings, sizeof (json_settings));
+
+   memset (&state.uint_max, 0xFF, sizeof (state.uint_max));
+   memset (&state.ulong_max, 0xFF, sizeof (state.ulong_max));
+
+   state.uint_max -= 8; /* limit of how much can be added before next check */
+   state.ulong_max -= 8;
+
+   for (state.first_pass = 1; state.first_pass >= 0; -- state.first_pass)
+   {
+      json_uchar uchar;
+      unsigned char uc_b1, uc_b2, uc_b3, uc_b4;
+      json_char * string;
+      unsigned int string_length;
+
+      top = root = 0;
+      flags = flag_seek_value;
+
+      cur_line = 1;
+      cur_line_begin = json;
+
+      for (i = json ;; ++ i)
+      {
+         json_char b = *i;
+
+         if (flags & flag_done)
+         {
+            if (!b)
+               break;
+
+            switch (b)
+            {
+               whitespace:
+                  continue;
+
+               default:
+                  sprintf (error, "%d:%d: Trailing garbage: `%c`", cur_line, e_off, b);
+                  goto e_failed;
+            };
+         }
+
+         if (flags & flag_string)
+         {
+            if (!b)
+            {  sprintf (error, "Unexpected EOF in string (at %d:%d)", cur_line, e_off);
+               goto e_failed;
+            }
+
+            if (string_length > state.uint_max)
+               goto e_overflow;
+
+            if (flags & flag_escaped)
+            {
+               flags &= ~ flag_escaped;
+
+               switch (b)
+               {
+                  case 'b':  string_add ('\b');  break;
+                  case 'f':  string_add ('\f');  break;
+                  case 'n':  string_add ('\n');  break;
+                  case 'r':  string_add ('\r');  break;
+                  case 't':  string_add ('\t');  break;
+                  case 'u':
+
+                    if ((uc_b1 = hex_value (*++ i)) == 0xFF || (uc_b2 = hex_value (*++ i)) == 0xFF
+                          || (uc_b3 = hex_value (*++ i)) == 0xFF || (uc_b4 = hex_value (*++ i)) == 0xFF)
+                    {
+                        sprintf (error, "Invalid character value `%c` (at %d:%d)", b, cur_line, e_off);
+                        goto e_failed;
+                    }
+
+                    uc_b1 = uc_b1 * 16 + uc_b2;
+                    uc_b2 = uc_b3 * 16 + uc_b4;
+
+                    uchar = ((json_char) uc_b1) * 256 + uc_b2;
+
+                    if (sizeof (json_char) >= sizeof (json_uchar) || (uc_b1 == 0 && uc_b2 <= 0x7F))
+                    {
+                       string_add ((json_char) uchar);
+                       break;
+                    }
+
+                    if (uchar <= 0x7FF)
+                    {
+                        if (state.first_pass)
+                           string_length += 2;
+                        else
+                        {  string [string_length ++] = 0xC0 | ((uc_b2 & 0xC0) >> 6) | ((uc_b1 & 0x3) << 3);
+                           string [string_length ++] = 0x80 | (uc_b2 & 0x3F);
+                        }
+
+                        break;
+                    }
+
+                    if (state.first_pass)
+                       string_length += 3;
+                    else
+                    {  string [string_length ++] = 0xE0 | ((uc_b1 & 0xF0) >> 4);
+                       string [string_length ++] = 0x80 | ((uc_b1 & 0xF) << 2) | ((uc_b2 & 0xC0) >> 6);
+                       string [string_length ++] = 0x80 | (uc_b2 & 0x3F);
+                    }
+
+                    break;
+
+                  default:
+                     string_add (b);
+               };
+
+               continue;
+            }
+
+            if (b == '\\')
+            {
+               flags |= flag_escaped;
+               continue;
+            }
+
+            if (b == '"')
+            {
+               if (!state.first_pass)
+                  string [string_length] = 0;
+
+               flags &= ~ flag_string;
+               string = 0;
+
+               switch (top->type)
+               {
+                  case json_string:
+
+                     top->u.string.length = string_length;
+                     flags |= flag_next;
+
+                     break;
+
+                  case json_object:
+
+                     if (state.first_pass)
+                        (*(json_char **) &top->u.object.values) += string_length + 1;
+                     else
+                     {  
+                        top->u.object.values [top->u.object.length].name
+                           = (json_char *) top->_reserved.object_mem;
+
+                        (*(json_char **) &top->_reserved.object_mem) += string_length + 1;
+                     }
+
+                     flags |= flag_seek_value | flag_need_colon;
+                     continue;
+
+                  default:
+                     break;
+               };
+            }
+            else
+            {
+               string_add (b);
+               continue;
+            }
+         }
+
+         if (flags & flag_seek_value)
+         {
+            switch (b)
+            {
+               whitespace:
+                  continue;
+
+               case ']':
+
+                  if (top->type == json_array)
+                     flags = (flags & ~ (flag_need_comma | flag_seek_value)) | flag_next;
+                  else if (!state.settings.settings & json_relaxed_commas)
+                  {  sprintf (error, "%d:%d: Unexpected ]", cur_line, e_off);
+                     goto e_failed;
+                  }
+
+                  break;
+
+               default:
+
+                  if (flags & flag_need_comma)
+                  {
+                     if (b == ',')
+                     {  flags &= ~ flag_need_comma;
+                        continue;
+                     }
+                     else
+                     {  sprintf (error, "%d:%d: Expected , before %c", cur_line, e_off, b);
+                        goto e_failed;
+                     }
+                  }
+
+                  if (flags & flag_need_colon)
+                  {
+                     if (b == ':')
+                     {  flags &= ~ flag_need_colon;
+                        continue;
+                     }
+                     else
+                     {  sprintf (error, "%d:%d: Expected : before %c", cur_line, e_off, b);
+                        goto e_failed;
+                     }
+                  }
+
+                  flags &= ~ flag_seek_value;
+
+                  switch (b)
+                  {
+                     case '{':
+
+                        if (!new_value (&state, &top, &root, &alloc, json_object))
+                           goto e_alloc_failure;
+
+                        continue;
+
+                     case '[':
+
+                        if (!new_value (&state, &top, &root, &alloc, json_array))
+                           goto e_alloc_failure;
+
+                        flags |= flag_seek_value;
+                        continue;
+
+                     case '"':
+
+                        if (!new_value (&state, &top, &root, &alloc, json_string))
+                           goto e_alloc_failure;
+
+                        flags |= flag_string;
+
+                        string = top->u.string.ptr;
+                        string_length = 0;
+
+                        continue;
+
+                     case 't':
+
+                        if (*(++ i) != 'r' || *(++ i) != 'u' || *(++ i) != 'e')
+                           goto e_unknown_value;
+
+                        if (!new_value (&state, &top, &root, &alloc, json_boolean))
+                           goto e_alloc_failure;
+
+                        top->u.boolean = 1;
+
+                        flags |= flag_next;
+                        break;
+
+                     case 'f':
+
+                        if (*(++ i) != 'a' || *(++ i) != 'l' || *(++ i) != 's' || *(++ i) != 'e')
+                           goto e_unknown_value;
+
+                        if (!new_value (&state, &top, &root, &alloc, json_boolean))
+                           goto e_alloc_failure;
+
+                        flags |= flag_next;
+                        break;
+
+                     case 'n':
+
+                        if (*(++ i) != 'u' || *(++ i) != 'l' || *(++ i) != 'l')
+                           goto e_unknown_value;
+
+                        if (!new_value (&state, &top, &root, &alloc, json_null))
+                           goto e_alloc_failure;
+
+                        flags |= flag_next;
+                        break;
+
+                     default:
+
+                        if (isdigit (b) || b == '-')
+                        {
+                           if (!new_value (&state, &top, &root, &alloc, json_integer))
+                              goto e_alloc_failure;
+
+                           flags &= ~ (flag_exponent | flag_got_exponent_sign);
+
+                           if (state.first_pass)
+                              continue;
+
+                           if (top->type == json_double)
+                              top->u.dbl = strtod (i, (json_char **) &i);
+                           else
+                              top->u.integer = strtol (i, (json_char **) &i, 10);
+
+                           flags |= flag_next | flag_reproc;
+                        }
+                        else
+                        {  sprintf (error, "%d:%d: Unexpected %c when seeking value", cur_line, e_off, b);
+                           goto e_failed;
+                        }
+                  };
+            };
+         }
+         else
+         {
+            switch (top->type)
+            {
+            case json_object:
+               
+               switch (b)
+               {
+                  whitespace:
+                     continue;
+
+                  case '"':
+
+                     if (flags & flag_need_comma && (!state.settings.settings & json_relaxed_commas))
+                     {
+                        sprintf (error, "%d:%d: Expected , before \"", cur_line, e_off);
+                        goto e_failed;
+                     }
+
+                     flags |= flag_string;
+
+                     string = (json_char *) top->_reserved.object_mem;
+                     string_length = 0;
+
+                     break;
+                  
+                  case '}':
+
+                     flags = (flags & ~ flag_need_comma) | flag_next;
+                     break;
+
+                  case ',':
+
+                     if (flags & flag_need_comma)
+                     {
+                        flags &= ~ flag_need_comma;
+                        break;
+                     }
+
+                  default:
+
+                     sprintf (error, "%d:%d: Unexpected `%c` in object", cur_line, e_off, b);
+                     goto e_failed;
+               };
+
+               break;
+
+            case json_integer:
+            case json_double:
+
+               if (isdigit (b))
+                  continue;
+
+               if (b == 'e' || b == 'E')
+               {
+                  if (!(flags & flag_exponent))
+                  {
+                     flags |= flag_exponent;
+                     top->type = json_double;
+
+                     continue;
+                  }
+               }
+               else if (b == '+' || b == '-')
+               {
+                  if (flags & flag_exponent && !(flags & flag_got_exponent_sign))
+                  {
+                     flags |= flag_got_exponent_sign;
+                     continue;
+                  }
+               }
+               else if (b == '.' && top->type == json_integer)
+               {
+                  top->type = json_double;
+                  continue;
+               }
+
+               flags |= flag_next | flag_reproc;
+               break;
+
+            default:
+               break;
+            };
+         }
+
+         if (flags & flag_reproc)
+         {
+            flags &= ~ flag_reproc;
+            -- i;
+         }
+
+         if (flags & flag_next)
+         {
+            flags = (flags & ~ flag_next) | flag_need_comma;
+
+            if (!top->parent)
+            {
+               /* root value done */
+
+               flags |= flag_done;
+               continue;
+            }
+
+            if (top->parent->type == json_array)
+               flags |= flag_seek_value;
+               
+            if (!state.first_pass)
+            {
+               json_value * parent = top->parent;
+
+               switch (parent->type)
+               {
+                  case json_object:
+
+                     parent->u.object.values
+                        [parent->u.object.length].value = top;
+
+                     break;
+
+                  case json_array:
+
+                     parent->u.array.values
+                           [parent->u.array.length] = top;
+
+                     break;
+
+                  default:
+                     break;
+               };
+            }
+
+            if ( (++ top->parent->u.array.length) > state.uint_max)
+               goto e_overflow;
+
+            top = top->parent;
+
+            continue;
+         }
+      }
+
+      alloc = root;
+   }
+
+   return root;
+
+e_unknown_value:
+
+   sprintf (error, "%d:%d: Unknown value", cur_line, e_off);
+   goto e_failed;
+
+e_alloc_failure:
+
+   strcpy (error, "Memory allocation failure");
+   goto e_failed;
+
+e_overflow:
+
+   sprintf (error, "%d:%d: Too long (caught overflow)", cur_line, e_off);
+   goto e_failed;
+
+e_failed:
+
+   if (error_buf)
+   {
+      if (*error)
+         strcpy (error_buf, error);
+      else
+         strcpy (error_buf, "Unknown error");
+   }
+
+   if (state.first_pass)
+      alloc = root;
+
+   while (alloc)
+   {
+      top = alloc->_reserved.next_alloc;
+      free (alloc);
+      alloc = top;
+   }
+
+   if (!state.first_pass)
+      json_value_free (root);
+
+   return 0;
+}
+
+json_value * json_parse (const json_char * json)
+{
+   json_settings settings;
+   memset (&settings, 0, sizeof (json_settings));
+
+   return json_parse_ex (&settings, json, 0);
+}
+
+void json_value_free (json_value * value)
+{
+   json_value * cur_value;
+
+   if (!value)
+      return;
+
+   value->parent = 0;
+
+   while (value)
+   {
+      switch (value->type)
+      {
+         case json_array:
+
+            if (!value->u.array.length)
+            {
+               free (value->u.array.values);
+               break;
+            }
+
+            value = value->u.array.values [-- value->u.array.length];
+            continue;
+
+         case json_object:
+
+            if (!value->u.object.length)
+            {
+               free (value->u.object.values);
+               break;
+            }
+
+            value = value->u.object.values [-- value->u.object.length].value;
+            continue;
+
+         case json_string:
+
+            free (value->u.string.ptr);
+            break;
+
+         default:
+            break;
+      };
+
+      cur_value = value;
+      value = value->parent;
+      free (cur_value);
+   }
+}
+
+