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#ifndef _FBUFFER_H_
#define _FBUFFER_H_
#include "ruby.h"
#include "ruby/encoding.h"
enum fbuffer_type {
HEAP = 0,
STACK = 1,
};
typedef struct FBufferStruct {
enum fbuffer_type type;
unsigned long initial_length;
unsigned long len;
unsigned long capa;
char *ptr;
} FBuffer;
#define FBUFFER_STACK_SIZE 512
#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 void fbuffer_free(FBuffer *fb);
#ifndef JSON_GENERATOR
static void fbuffer_clear(FBuffer *fb);
#endif
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 inline void fbuffer_append_char(FBuffer *fb, char newchr);
#ifdef JSON_GENERATOR
static VALUE fbuffer_to_s(FBuffer *fb);
#endif
#ifndef RB_UNLIKELY
#define RB_UNLIKELY(expr) expr
#endif
#ifndef RB_LIKELY
#define RB_LIKELY(expr) expr
#endif
static void fbuffer_stack_init(FBuffer *fb, unsigned long initial_length, char *stack_buffer, long stack_buffer_size)
{
fb->initial_length = (initial_length > 0) ? initial_length : FBUFFER_INITIAL_LENGTH_DEFAULT;
if (stack_buffer) {
fb->type = STACK;
fb->ptr = stack_buffer;
fb->capa = stack_buffer_size;
}
}
static void fbuffer_free(FBuffer *fb)
{
if (fb->ptr && fb->type == HEAP) {
ruby_xfree(fb->ptr);
}
}
#ifndef JSON_GENERATOR
static void fbuffer_clear(FBuffer *fb)
{
fb->len = 0;
}
#endif
static void fbuffer_do_inc_capa(FBuffer *fb, unsigned long requested)
{
unsigned long required;
if (RB_UNLIKELY(!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) {
if (fb->type == STACK) {
const char *old_buffer = fb->ptr;
fb->ptr = ALLOC_N(char, required);
fb->type = HEAP;
MEMCPY(fb->ptr, old_buffer, char, fb->len);
} else {
REALLOC_N(fb->ptr, char, required);
}
fb->capa = required;
}
}
static inline void fbuffer_inc_capa(FBuffer *fb, unsigned long requested)
{
if (RB_UNLIKELY(requested > fb->capa - fb->len)) {
fbuffer_do_inc_capa(fb, requested);
}
}
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 inline void fbuffer_append_char(FBuffer *fb, char newchr)
{
fbuffer_inc_capa(fb, 1);
*(fb->ptr + fb->len) = newchr;
fb->len++;
}
#ifdef JSON_GENERATOR
static long fltoa(long number, char *buf)
{
static const 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-- = '-';
return buf - tmp;
}
#define LONG_BUFFER_SIZE 20
static void fbuffer_append_long(FBuffer *fb, long number)
{
char buf[LONG_BUFFER_SIZE];
char *buffer_end = buf + LONG_BUFFER_SIZE;
long len = fltoa(number, buffer_end - 1);
fbuffer_append(fb, buffer_end - len, len);
}
static VALUE fbuffer_to_s(FBuffer *fb)
{
VALUE result = rb_utf8_str_new(FBUFFER_PTR(fb), FBUFFER_LEN(fb));
fbuffer_free(fb);
return result;
}
#endif
#endif
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