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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <grpc/support/alloc.h>
#include <grpc/support/cmdline.h>
#include <grpc/support/log.h>
#include "src/core/lib/json/json_reader.h"
#include "src/core/lib/json/json_writer.h"
typedef struct json_writer_userdata { FILE *out; } json_writer_userdata;
typedef struct stacked_container {
grpc_json_type type;
struct stacked_container *next;
} stacked_container;
typedef struct json_reader_userdata {
FILE *in;
grpc_json_writer *writer;
char *scratchpad;
char *ptr;
size_t free_space;
size_t allocated;
size_t string_len;
stacked_container *top;
} json_reader_userdata;
static void json_writer_output_char(void *userdata, char c) {
json_writer_userdata *state = userdata;
fputc(c, state->out);
}
static void json_writer_output_string(void *userdata, const char *str) {
json_writer_userdata *state = userdata;
fputs(str, state->out);
}
static void json_writer_output_string_with_len(void *userdata, const char *str,
size_t len) {
json_writer_userdata *state = userdata;
fwrite(str, len, 1, state->out);
}
grpc_json_writer_vtable writer_vtable = {json_writer_output_char,
json_writer_output_string,
json_writer_output_string_with_len};
static void check_string(json_reader_userdata *state, size_t needed) {
if (state->free_space >= needed) return;
needed -= state->free_space;
needed = (needed + 0xffu) & ~0xffu;
state->scratchpad = gpr_realloc(state->scratchpad, state->allocated + needed);
state->free_space += needed;
state->allocated += needed;
}
static void json_reader_string_clear(void *userdata) {
json_reader_userdata *state = userdata;
state->free_space = state->allocated;
state->string_len = 0;
}
static void json_reader_string_add_char(void *userdata, uint32_t c) {
json_reader_userdata *state = userdata;
check_string(state, 1);
GPR_ASSERT(c < 256);
state->scratchpad[state->string_len++] = (char)c;
}
static void json_reader_string_add_utf32(void *userdata, uint32_t c) {
if (c <= 0x7f) {
json_reader_string_add_char(userdata, c);
} else if (c <= 0x7ff) {
uint32_t b1 = 0xc0u | ((c >> 6u) & 0x1fu);
uint32_t b2 = 0x80u | (c & 0x3fu);
json_reader_string_add_char(userdata, b1);
json_reader_string_add_char(userdata, b2);
} else if (c <= 0xffffu) {
uint32_t b1 = 0xe0u | ((c >> 12u) & 0x0fu);
uint32_t b2 = 0x80u | ((c >> 6u) & 0x3fu);
uint32_t b3 = 0x80u | (c & 0x3fu);
json_reader_string_add_char(userdata, b1);
json_reader_string_add_char(userdata, b2);
json_reader_string_add_char(userdata, b3);
} else if (c <= 0x1fffffu) {
uint32_t b1 = 0xf0u | ((c >> 18u) & 0x07u);
uint32_t b2 = 0x80u | ((c >> 12u) & 0x3fu);
uint32_t b3 = 0x80u | ((c >> 6u) & 0x3fu);
uint32_t b4 = 0x80u | (c & 0x3fu);
json_reader_string_add_char(userdata, b1);
json_reader_string_add_char(userdata, b2);
json_reader_string_add_char(userdata, b3);
json_reader_string_add_char(userdata, b4);
}
}
static uint32_t json_reader_read_char(void *userdata) {
int r;
json_reader_userdata *state = userdata;
r = fgetc(state->in);
if (r == EOF) r = GRPC_JSON_READ_CHAR_EOF;
return (uint32_t)r;
}
static void json_reader_container_begins(void *userdata, grpc_json_type type) {
json_reader_userdata *state = userdata;
stacked_container *container = gpr_malloc(sizeof(stacked_container));
container->type = type;
container->next = state->top;
state->top = container;
grpc_json_writer_container_begins(state->writer, type);
}
static grpc_json_type json_reader_container_ends(void *userdata) {
json_reader_userdata *state = userdata;
stacked_container *container = state->top;
grpc_json_writer_container_ends(state->writer, container->type);
state->top = container->next;
gpr_free(container);
return state->top ? state->top->type : GRPC_JSON_TOP_LEVEL;
}
static void json_reader_set_key(void *userdata) {
json_reader_userdata *state = userdata;
json_reader_string_add_char(userdata, 0);
grpc_json_writer_object_key(state->writer, state->scratchpad);
}
static void json_reader_set_string(void *userdata) {
json_reader_userdata *state = userdata;
json_reader_string_add_char(userdata, 0);
grpc_json_writer_value_string(state->writer, state->scratchpad);
}
static int json_reader_set_number(void *userdata) {
json_reader_userdata *state = userdata;
grpc_json_writer_value_raw_with_len(state->writer, state->scratchpad,
state->string_len);
return 1;
}
static void json_reader_set_true(void *userdata) {
json_reader_userdata *state = userdata;
grpc_json_writer_value_raw_with_len(state->writer, "true", 4);
}
static void json_reader_set_false(void *userdata) {
json_reader_userdata *state = userdata;
grpc_json_writer_value_raw_with_len(state->writer, "false", 5);
}
static void json_reader_set_null(void *userdata) {
json_reader_userdata *state = userdata;
grpc_json_writer_value_raw_with_len(state->writer, "null", 4);
}
static grpc_json_reader_vtable reader_vtable = {
json_reader_string_clear, json_reader_string_add_char,
json_reader_string_add_utf32, json_reader_read_char,
json_reader_container_begins, json_reader_container_ends,
json_reader_set_key, json_reader_set_string,
json_reader_set_number, json_reader_set_true,
json_reader_set_false, json_reader_set_null};
int rewrite(FILE *in, FILE *out, int indent) {
grpc_json_writer writer;
grpc_json_reader reader;
grpc_json_reader_status status;
json_writer_userdata writer_user;
json_reader_userdata reader_user;
reader_user.writer = &writer;
reader_user.in = in;
reader_user.top = NULL;
reader_user.scratchpad = NULL;
reader_user.string_len = 0;
reader_user.free_space = 0;
reader_user.allocated = 0;
writer_user.out = out;
grpc_json_writer_init(&writer, indent, &writer_vtable, &writer_user);
grpc_json_reader_init(&reader, &reader_vtable, &reader_user);
status = grpc_json_reader_run(&reader);
free(reader_user.scratchpad);
while (reader_user.top) {
stacked_container *container = reader_user.top;
reader_user.top = container->next;
free(container);
}
return status == GRPC_JSON_DONE;
}
int main(int argc, char **argv) {
int indent = 2;
gpr_cmdline *cl;
cl = gpr_cmdline_create(NULL);
gpr_cmdline_add_int(cl, "indent", NULL, &indent);
gpr_cmdline_parse(cl, argc, argv);
gpr_cmdline_destroy(cl);
return rewrite(stdin, stdout, indent) ? 0 : 1;
}
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