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#ifndef _FBUFFER_H_
#define _FBUFFER_H_
#include "ruby.h"
#ifndef RHASH_SIZE
#define RHASH_SIZE(hsh) (RHASH(hsh)->tbl->num_entries)
#endif
#ifndef RFLOAT_VALUE
#define RFLOAT_VALUE(val) (RFLOAT(val)->value)
#endif
#ifndef RARRAY_PTR
#define RARRAY_PTR(ARRAY) RARRAY(ARRAY)->ptr
#endif
#ifndef RARRAY_LEN
#define RARRAY_LEN(ARRAY) RARRAY(ARRAY)->len
#endif
#ifndef RSTRING_PTR
#define RSTRING_PTR(string) RSTRING(string)->ptr
#endif
#ifndef RSTRING_LEN
#define RSTRING_LEN(string) RSTRING(string)->len
#endif
#ifdef HAVE_RUBY_ENCODING_H
#include "ruby/encoding.h"
#define FORCE_UTF8(obj) rb_enc_associate((obj), rb_utf8_encoding())
#else
#define FORCE_UTF8(obj)
#endif
/* We don't need to guard objects for rbx, so let's do nothing at all. */
#ifndef RB_GC_GUARD
#define RB_GC_GUARD(object)
#endif
typedef struct FBufferStruct {
unsigned long initial_length;
char *ptr;
unsigned long len;
unsigned long capa;
} FBuffer;
#define FBUFFER_INITIAL_LENGTH_DEFAULT 1024
#define FBUFFER_PTR(fb) (fb->ptr)
#define FBUFFER_LEN(fb) (fb->len)
#define FBUFFER_CAPA(fb) (fb->capa)
#define FBUFFER_PAIR(fb) FBUFFER_PTR(fb), FBUFFER_LEN(fb)
static FBuffer *fbuffer_alloc(unsigned long initial_length);
static void fbuffer_free(FBuffer *fb);
static void fbuffer_clear(FBuffer *fb);
static void fbuffer_append(FBuffer *fb, const char *newstr, unsigned long len);
#ifdef JSON_GENERATOR
static void fbuffer_append_long(FBuffer *fb, long number);
#endif
static void fbuffer_append_char(FBuffer *fb, char newchr);
#ifdef JSON_GENERATOR
static FBuffer *fbuffer_dup(FBuffer *fb);
static VALUE fbuffer_to_s(FBuffer *fb);
#endif
static FBuffer *fbuffer_alloc(unsigned long initial_length)
{
FBuffer *fb;
if (initial_length <= 0) initial_length = FBUFFER_INITIAL_LENGTH_DEFAULT;
fb = ALLOC(FBuffer);
memset((void *) fb, 0, sizeof(FBuffer));
fb->initial_length = initial_length;
return fb;
}
static void fbuffer_free(FBuffer *fb)
{
if (fb->ptr) ruby_xfree(fb->ptr);
ruby_xfree(fb);
}
static void fbuffer_clear(FBuffer *fb)
{
fb->len = 0;
}
static void fbuffer_inc_capa(FBuffer *fb, unsigned long requested)
{
unsigned long required;
if (!fb->ptr) {
fb->ptr = ALLOC_N(char, fb->initial_length);
fb->capa = fb->initial_length;
}
for (required = fb->capa; requested > required - fb->len; required <<= 1);
if (required > fb->capa) {
REALLOC_N(fb->ptr, char, required);
fb->capa = required;
}
}
static void fbuffer_append(FBuffer *fb, const char *newstr, unsigned long len)
{
if (len > 0) {
fbuffer_inc_capa(fb, len);
MEMCPY(fb->ptr + fb->len, newstr, char, len);
fb->len += len;
}
}
#ifdef JSON_GENERATOR
static void fbuffer_append_str(FBuffer *fb, VALUE str)
{
const char *newstr = StringValuePtr(str);
unsigned long len = RSTRING_LEN(str);
RB_GC_GUARD(str);
fbuffer_append(fb, newstr, len);
}
#endif
static void fbuffer_append_char(FBuffer *fb, char newchr)
{
fbuffer_inc_capa(fb, 1);
*(fb->ptr + fb->len) = newchr;
fb->len++;
}
#ifdef JSON_GENERATOR
static void freverse(char *start, char *end)
{
char c;
while (end > start) {
c = *end, *end-- = *start, *start++ = c;
}
}
static long fltoa(long number, char *buf)
{
static char digits[] = "0123456789";
long sign = number;
char* tmp = buf;
if (sign < 0) number = -number;
do *tmp++ = digits[number % 10]; while (number /= 10);
if (sign < 0) *tmp++ = '-';
freverse(buf, tmp - 1);
return tmp - buf;
}
static void fbuffer_append_long(FBuffer *fb, long number)
{
char buf[20];
unsigned long len = fltoa(number, buf);
fbuffer_append(fb, buf, len);
}
static FBuffer *fbuffer_dup(FBuffer *fb)
{
unsigned long len = fb->len;
FBuffer *result;
result = fbuffer_alloc(len);
fbuffer_append(result, FBUFFER_PAIR(fb));
return result;
}
static VALUE fbuffer_to_s(FBuffer *fb)
{
VALUE result = rb_str_new(FBUFFER_PAIR(fb));
fbuffer_free(fb);
FORCE_UTF8(result);
return result;
}
#endif
#endif
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