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Add proper JSON string encoding and decoding.

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This commit is contained in:
Jordan Bancino 2022-07-26 13:08:46 -04:00
parent 644733c74e
commit 4e0543b028
1 changed files with 145 additions and 5 deletions
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150
src/Json.c
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@ -249,9 +249,149 @@ JsonValueFree(JsonValue * value)
} }
static void static void
JsonEncodeString(const char * str, FILE * out) JsonEncodeString(const char *str, FILE * out)
{ {
fprintf(out, "\"%s\"", str); size_t i;
char c;
fputc('"', out);
i = 0;
while ((c = str[i]) != '\0')
{
switch (c)
{
case '\\':
case '"':
case '/':
fputc('\\', out);
fputc(c, out);
break;
case '\b':
fputs("\\b", out);
break;
case '\t':
fputs("\\t", out);
break;
case '\n':
fputs("\\n", out);
break;
case '\f':
fputs("\\f", out);
break;
case '\r':
fputs("\\r", out);
break;
default:
if (c < ' ')
{
fprintf(out, "\\u%04x", c);
}
else
{
fputc(c, out);
}
break;
}
i++;
}
fputc('"', out);
}
static char *
JsonDecodeString(FILE * in)
{
const size_t strBlockSize = 16;
size_t len;
size_t allocated;
char *str;
char c;
char a;
len = 0;
allocated = strBlockSize;
str = malloc(allocated * sizeof(char));
if (!str)
{
return NULL;
}
while ((c = fgetc(in)) != EOF)
{
switch (c)
{
case '"':
str[len] = '\0';
return str;
break;
case '\\':
c = fgetc(in);
switch (c)
{
case '\\':
case '"':
case '/':
a = c;
break;
case 'b':
a = '\b';
break;
case 't':
a = '\t';
break;
case 'n':
a = '\n';
break;
case 'f':
a = '\f';
break;
case 'r':
a = '\r';
break;
case 'u':
if (fscanf(in, "%04x", (unsigned int *) &a) != 1)
{
/* Bad hex value */
free(str);
return NULL;
}
break;
default:
/* Bad escape value */
free(str);
return NULL;
}
break;
default:
a = c;
break;
}
/* Append a */
if (len >= allocated)
{
char *tmp;
allocated += strBlockSize;
tmp = realloc(str, allocated * sizeof(char));
if (!tmp)
{
free(str);
return NULL;
}
str = tmp;
}
str[len] = a;
len++;
}
free(str);
return NULL;
} }
static void static void
@ -284,7 +424,7 @@ JsonEncodeValue(JsonValue * value, FILE * out)
fputc(']', out); fputc(']', out);
break; break;
case JSON_STRING: case JSON_STRING:
JsonEncodeString(value->as.string, out); JsonEncodeString(value->as.string, out);
break; break;
case JSON_INTEGER: case JSON_INTEGER:
fprintf(out, "%lld", value->as.integer); fprintf(out, "%lld", value->as.integer);
@ -334,8 +474,8 @@ JsonEncode(HashMap * object, FILE * out)
index = 0; index = 0;
while (HashMapIterate(object, &key, (void **) &value)) while (HashMapIterate(object, &key, (void **) &value))
{ {
JsonEncodeString(key, out); JsonEncodeString(key, out);
fputc(':', out); fputc(':', out);
JsonEncodeValue(value, out); JsonEncodeValue(value, out);
if (index < count - 1) if (index < count - 1)