forked from davisp/jiffy
/
encoder.c
724 lines (634 loc) · 17.6 KB
/
encoder.c
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// This file is part of Jiffy released under the MIT license.
// See the LICENSE file for more information.
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "erl_nif.h"
#include "jiffy.h"
#define BIN_INC_SIZE 2048
#define MIN(X, Y) ((X) < (Y) ? (X) : (Y))
#define MAYBE_PRETTY(e) \
do { \
if(e->pretty) { \
if(!enc_shift(e)) \
return 0; \
} \
} while(0)
#ifdef WINDOWS || WIN32
#define inline __inline
#define snprintf _snprintf
#endif
typedef struct {
ErlNifEnv* env;
jiffy_st* atoms;
int uescape;
int pretty;
int shiftcnt;
int count;
int iolen;
ERL_NIF_TERM iolist;
ErlNifBinary* curr;
char* p;
unsigned char* u;
size_t i;
} Encoder;
// String constants for pretty printing.
// Every string starts with its length.
#define NUM_SHIFTS 8
static char* shifts[NUM_SHIFTS] = {
"\x01\n",
"\x03\n ",
"\x05\n ",
"\x07\n ",
"\x09\n ",
"\x0b\n ",
"\x0d\n ",
"\x0f\n "
};
int
enc_init(Encoder* e, ErlNifEnv* env, ERL_NIF_TERM opts, ErlNifBinary* bin)
{
ERL_NIF_TERM val;
e->env = env;
e->atoms = enif_priv_data(env);
e->uescape = 0;
e->pretty = 0;
e->shiftcnt = 0;
e->count = 0;
if(!enif_is_list(env, opts)) {
return 0;
}
while(enif_get_list_cell(env, opts, &val, &opts)) {
if(enif_compare(val, e->atoms->atom_uescape) == 0) {
e->uescape = 1;
} else if(enif_compare(val, e->atoms->atom_pretty) == 0) {
e->pretty = 1;
} else if(enif_compare(val, e->atoms->atom_force_utf8) == 0) {
// Ignore, handled in Erlang
} else {
return 0;
}
}
e->iolen = 0;
e->iolist = enif_make_list(env, 0);
e->curr = bin;
if(!enif_alloc_binary(BIN_INC_SIZE, e->curr)) {
return 0;
}
memset(e->curr->data, 0, e->curr->size);
e->p = (char*) e->curr->data;
e->u = (unsigned char*) e->curr->data;
e->i = 0;
return 1;
}
void
enc_destroy(Encoder* e)
{
if(e->curr != NULL) {
enif_release_binary(e->curr);
}
}
ERL_NIF_TERM
enc_error(Encoder* e, const char* msg)
{
//assert(0 && msg);
return make_error(e->atoms, e->env, msg);
}
static inline int
enc_ensure(Encoder* e, size_t req)
{
size_t need = e->curr->size;
while(req >= (need - e->i)) need <<= 1;
if(need != e->curr->size) {
if(!enif_realloc_binary(e->curr, need)) {
return 0;
}
e->p = (char*) e->curr->data;
e->u = (unsigned char*) e->curr->data;
}
return 1;
}
int
enc_result(Encoder* e, ERL_NIF_TERM* value)
{
if(e->i != e->curr->size) {
if(!enif_realloc_binary(e->curr, e->i)) {
return 0;
}
}
*value = enif_make_binary(e->env, e->curr);
e->curr = NULL;
return 1;
}
int
enc_done(Encoder* e, ERL_NIF_TERM* value)
{
ERL_NIF_TERM last;
if(e->iolen == 0) {
return enc_result(e, value);
}
if(e->i > 0 ) {
if(!enc_result(e, &last)) {
return 0;
}
e->iolist = enif_make_list_cell(e->env, last, e->iolist);
e->iolen++;
}
*value = e->iolist;
return 1;
}
static inline int
enc_unknown(Encoder* e, ERL_NIF_TERM value)
{
ErlNifBinary* bin = e->curr;
ERL_NIF_TERM curr;
if(e->i > 0) {
if(!enc_result(e, &curr)) {
return 0;
}
e->iolist = enif_make_list_cell(e->env, curr, e->iolist);
e->iolen++;
}
e->iolist = enif_make_list_cell(e->env, value, e->iolist);
e->iolen++;
// Reinitialize our binary for the next buffer.
e->curr = bin;
if(!enif_alloc_binary(BIN_INC_SIZE, e->curr)) {
return 0;
}
memset(e->curr->data, 0, e->curr->size);
e->p = (char*) e->curr->data;
e->u = (unsigned char*) e->curr->data;
e->i = 0;
return 1;
}
static inline int
enc_literal(Encoder* e, const char* literal, size_t len)
{
if(!enc_ensure(e, len)) {
return 0;
}
memcpy(&(e->p[e->i]), literal, len);
e->i += len;
e->count++;
return 1;
}
static inline int
enc_string(Encoder* e, ERL_NIF_TERM val)
{
ErlNifBinary bin;
char atom[512];
unsigned char* data;
size_t size;
int esc_extra = 0;
int ulen;
int uval;
int i;
if(enif_is_binary(e->env, val)) {
if(!enif_inspect_binary(e->env, val, &bin)) {
return 0;
}
data = bin.data;
size = bin.size;
} else if(enif_is_atom(e->env, val)) {
if(!enif_get_atom(e->env, val, atom, 512, ERL_NIF_LATIN1)) {
return 0;
}
data = (unsigned char*) atom;
size = strlen(atom);
} else {
return 0;
}
i = 0;
while(i < size) {
switch((char) data[i]) {
case '\"':
case '\\':
case '/':
case '\b':
case '\f':
case '\n':
case '\r':
case '\t':
esc_extra += 1;
i++;
continue;
default:
if(data[i] < 0x20) {
esc_extra += 5;
i++;
continue;
} else if(data[i] < 0x80) {
i++;
continue;
}
ulen = utf8_validate(&(data[i]), size - i);
if(ulen < 0) {
return 0;
}
if(e->uescape) {
uval = utf8_to_unicode(&(data[i]), ulen);
if(uval < 0) {
return 0;
}
esc_extra += utf8_esc_len(uval);
if(ulen < 0) {
return 0;
}
}
i += ulen;
}
}
if(!enc_ensure(e, size + esc_extra + 2)) {
return 0;
}
e->p[e->i++] = '\"';
i = 0;
while(i < size) {
switch((char) data[i]) {
case '\"':
case '\\':
case '/':
e->p[e->i++] = '\\';
e->u[e->i++] = data[i];
i++;
continue;
case '\b':
e->p[e->i++] = '\\';
e->p[e->i++] = 'b';
i++;
continue;
case '\f':
e->p[e->i++] = '\\';
e->p[e->i++] = 'f';
i++;
continue;
case '\n':
e->p[e->i++] = '\\';
e->p[e->i++] = 'n';
i++;
continue;
case '\r':
e->p[e->i++] = '\\';
e->p[e->i++] = 'r';
i++;
continue;
case '\t':
e->p[e->i++] = '\\';
e->p[e->i++] = 't';
i++;
continue;
default:
if(data[i] < 0x20) {
ulen = unicode_uescape(data[i], &(e->p[e->i]));
if(ulen < 0) {
return 0;
}
e->i += ulen;
i++;
} else if((data[i] & 0x80) && e->uescape) {
uval = utf8_to_unicode(&(data[i]), size-i);
if(uval < 0) {
return 0;
}
ulen = unicode_uescape(uval, &(e->p[e->i]));
if(ulen < 0) {
return 0;
}
e->i += ulen;
ulen = utf8_len(uval);
if(ulen < 0) {
return 0;
}
i += ulen;
} else {
e->u[e->i++] = data[i++];
}
}
}
e->p[e->i++] = '\"';
e->count++;
return 1;
}
static inline int
enc_long(Encoder* e, ErlNifSInt64 val)
{
if(!enc_ensure(e, 32)) {
return 0;
}
#if (defined(__WIN32__) || defined(_WIN32) || defined(_WIN32_))
snprintf(&(e->p[e->i]), 32, "%ld", val);
#elif SIZEOF_LONG == 8
snprintf(&(e->p[e->i]), 32, "%ld", val);
#else
snprintf(&(e->p[e->i]), 32, "%lld", val);
#endif
e->i += strlen(&(e->p[e->i]));
e->count++;
return 1;
}
static inline int
enc_double(Encoder* e, double val)
{
char* start;
size_t len;
size_t i;
if(!enc_ensure(e, 32)) {
return 0;
}
start = &(e->p[e->i]);
sprintf(start, "%0.20g", val);
len = strlen(start);
// Check if we have a decimal point
for(i = 0; i < len; i++) {
if(start[i] == '.' || start[i] == 'e' || start[i] == 'E')
goto done;
}
if(len > 29) return 0;
// Force a decimal point
start[len++] = '.';
start[len++] = '0';
done:
e->i += len;
e->count++;
return 1;
}
static inline int
enc_char(Encoder* e, char c)
{
if(!enc_ensure(e, 1)) {
return 0;
}
e->p[e->i++] = c;
return 1;
}
static int
enc_shift(Encoder* e) {
int i;
char* shift;
assert(e->shiftcnt >= 0 && "Invalid shift count.");
shift = shifts[MIN(e->shiftcnt, NUM_SHIFTS-1)];
if(!enc_literal(e, shift + 1, *shift))
return 0;
// Finish the rest of this shift it's it bigger than
// our largest predefined constant.
for(i = NUM_SHIFTS - 1; i < e->shiftcnt; i++) {
if(!enc_literal(e, " ", 2))
return 0;
}
return 1;
}
static inline int
enc_start_object(Encoder* e)
{
e->count++;
e->shiftcnt++;
if(!enc_char(e, '{'))
return 0;
MAYBE_PRETTY(e);
return 1;
}
static inline int
enc_end_object(Encoder* e)
{
e->shiftcnt--;
MAYBE_PRETTY(e);
return enc_char(e, '}');
}
static inline int
enc_start_array(Encoder* e)
{
e->count++;
e->shiftcnt++;
if(!enc_char(e, '['))
return 0;
MAYBE_PRETTY(e);
return 1;
}
static inline int
enc_end_array(Encoder* e)
{
e->shiftcnt--;
MAYBE_PRETTY(e);
return enc_char(e, ']');
}
static inline int
enc_colon(Encoder* e)
{
if(e->pretty)
return enc_literal(e, " : ", 3);
return enc_char(e, ':');
}
static inline int
enc_comma(Encoder* e)
{
if(!enc_char(e, ','))
return 0;
MAYBE_PRETTY(e);
return 1;
}
ERL_NIF_TERM
encode(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
Encoder enc;
Encoder* e = &enc;
ErlNifBinary bin;
ERL_NIF_TERM ret;
ERL_NIF_TERM stack;
ERL_NIF_TERM curr;
ERL_NIF_TERM item;
const ERL_NIF_TERM* tuple;
int arity;
ErlNifSInt64 lval;
double dval;
if(argc != 2) {
return enif_make_badarg(env);
}
if(!enc_init(e, env, argv[1], &bin)) {
return enif_make_badarg(env);
}
stack = enif_make_list(env, 1, argv[0]);
while(!enif_is_empty_list(env, stack)) {
if(!enif_get_list_cell(env, stack, &curr, &stack)) {
ret = enc_error(e, "internal_error");
goto done;
}
if(enif_is_identical(curr, e->atoms->ref_object)) {
if(!enif_get_list_cell(env, stack, &curr, &stack)) {
ret = enc_error(e, "internal_error");
goto done;
}
if(enif_is_empty_list(env, curr)) {
if(!enc_end_object(e)) {
ret = enc_error(e, "internal_error");
goto done;
}
continue;
}
if(!enif_get_list_cell(env, curr, &item, &curr)) {
ret = enc_error(e, "internal_error");
goto done;
}
if(!enif_get_tuple(env, item, &arity, &tuple)) {
ret = enc_error(e, "invalid_object_pair");
goto done;
}
if(arity != 2) {
ret = enc_error(e, "invalid_object_pair");
goto done;
}
if(!enc_comma(e)) {
ret = enc_error(e, "internal_error");
goto done;
}
if(!enc_string(e, tuple[0])) {
ret = enc_error(e, "invalid_object_key");
goto done;
}
if(!enc_colon(e)) {
ret = enc_error(e, "internal_error");
goto done;
}
stack = enif_make_list_cell(env, curr, stack);
stack = enif_make_list_cell(env, e->atoms->ref_object, stack);
stack = enif_make_list_cell(env, tuple[1], stack);
} else if(enif_is_identical(curr, e->atoms->ref_array)) {
if(!enif_get_list_cell(env, stack, &curr, &stack)) {
ret = enc_error(e, "internal_error");
goto done;
}
if(enif_is_empty_list(env, curr)) {
if(!enc_end_array(e)) {
ret = enc_error(e, "internal_error");
goto done;
}
continue;
}
if(!enc_comma(e)) {
ret = enc_error(e, "internal_error");
goto done;
}
if(!enif_get_list_cell(env, curr, &item, &curr)) {
ret = enc_error(e, "internal_error");
goto done;
}
stack = enif_make_list_cell(env, curr, stack);
stack = enif_make_list_cell(env, e->atoms->ref_array, stack);
stack = enif_make_list_cell(env, item, stack);
} else if(enif_compare(curr, e->atoms->atom_null) == 0) {
if(!enc_literal(e, "null", 4)) {
ret = enc_error(e, "null");
goto done;
}
} else if(enif_compare(curr, e->atoms->atom_true) == 0) {
if(!enc_literal(e, "true", 4)) {
ret = enc_error(e, "true");
goto done;
}
} else if(enif_compare(curr, e->atoms->atom_false) == 0) {
if(!enc_literal(e, "false", 5)) {
ret = enc_error(e, "false");
goto done;
}
} else if(enif_is_binary(env, curr)) {
if(!enc_string(e, curr)) {
ret = enc_error(e, "invalid_string");
goto done;
}
} else if(enif_is_atom(env, curr)) {
if(!enc_string(e, curr)) {
ret = enc_error(e, "invalid_string");
goto done;
}
} else if(enif_get_int64(env, curr, &lval)) {
if(!enc_long(e, lval)) {
ret = enc_error(e, "internal_error");
goto done;
}
} else if(enif_get_double(env, curr, &dval)) {
if(!enc_double(e, dval)) {
ret = enc_error(e, "internal_error");
goto done;
}
} else if(enif_get_tuple(env, curr, &arity, &tuple)) {
if(arity != 1) {
ret = enc_error(e, "invalid_ejson");
goto done;
}
if(!enif_is_list(env, tuple[0])) {
ret = enc_error(e, "invalid_object");
goto done;
}
if(!enc_start_object(e)) {
ret = enc_error(e, "internal_error");
goto done;
}
if(enif_is_empty_list(env, tuple[0])) {
if(!enc_end_object(e)) {
ret = enc_error(e, "internal_error");
goto done;
}
continue;
}
if(!enif_get_list_cell(env, tuple[0], &item, &curr)) {
ret = enc_error(e, "internal_error");
goto done;
}
if(!enif_get_tuple(env, item, &arity, &tuple)) {
ret = enc_error(e, "invalid_object_member");
goto done;
}
if(arity != 2) {
ret = enc_error(e, "invalid_object_member_arity");
goto done;
}
if(!enc_string(e, tuple[0])) {
ret = enc_error(e, "invalid_object_member_key");
goto done;
}
if(!enc_colon(e)) {
ret = enc_error(e, "internal_error");
goto done;
}
stack = enif_make_list_cell(env, curr, stack);
stack = enif_make_list_cell(env, e->atoms->ref_object, stack);
stack = enif_make_list_cell(env, tuple[1], stack);
} else if(enif_is_list(env, curr)) {
if(!enc_start_array(e)) {
ret = enc_error(e, "internal_error");
goto done;
}
if(enif_is_empty_list(env, curr)) {
if(!enc_end_array(e)) {
ret = enc_error(e, "internal_error");
goto done;
}
continue;
}
if(!enif_get_list_cell(env, curr, &item, &curr)) {
ret = enc_error(e, "internal_error");
goto done;
}
stack = enif_make_list_cell(env, curr, stack);
stack = enif_make_list_cell(env, e->atoms->ref_array, stack);
stack = enif_make_list_cell(env, item, stack);
} else {
if(!enc_unknown(e, curr)) {
ret = enc_error(e, "internal_error");
goto done;
}
}
} while(!enif_is_empty_list(env, stack));
if(!enc_done(e, &item)) {
ret = enc_error(e, "internal_error");
goto done;
}
if(e->iolen == 0) {
ret = item;
} else {
ret = enif_make_tuple2(env, e->atoms->atom_partial, item);
}
done:
enc_destroy(e);
return ret;
}