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|
/*-
* BSD LICENSE
*
* Copyright (c) Intel Corporation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "spdk/json.h"
#include "spdk_internal/utf.h"
struct spdk_json_write_ctx {
spdk_json_write_cb write_cb;
void *cb_ctx;
uint32_t flags;
uint32_t indent;
bool new_indent;
bool first_value;
bool failed;
size_t buf_filled;
uint8_t buf[4096];
};
static int emit_buf_full(struct spdk_json_write_ctx *w, const void *data, size_t size);
static int
fail(struct spdk_json_write_ctx *w)
{
w->failed = true;
return -1;
}
static int
flush_buf(struct spdk_json_write_ctx *w)
{
int rc;
rc = w->write_cb(w->cb_ctx, w->buf, w->buf_filled);
if (rc != 0) {
return fail(w);
}
w->buf_filled = 0;
return 0;
}
struct spdk_json_write_ctx *
spdk_json_write_begin(spdk_json_write_cb write_cb, void *cb_ctx, uint32_t flags)
{
struct spdk_json_write_ctx *w;
w = calloc(1, sizeof(*w));
if (w == NULL) {
return w;
}
w->write_cb = write_cb;
w->cb_ctx = cb_ctx;
w->flags = flags;
w->indent = 0;
w->new_indent = false;
w->first_value = true;
w->failed = false;
w->buf_filled = 0;
return w;
}
int
spdk_json_write_end(struct spdk_json_write_ctx *w)
{
bool failed;
int rc;
if (w == NULL) {
return 0;
}
failed = w->failed;
rc = flush_buf(w);
if (rc != 0) {
failed = true;
}
free(w);
return failed ? -1 : 0;
}
static inline int
emit(struct spdk_json_write_ctx *w, const void *data, size_t size)
{
size_t buf_remain = sizeof(w->buf) - w->buf_filled;
if (spdk_unlikely(size > buf_remain)) {
/* Not enough space in buffer for the new data. */
return emit_buf_full(w, data, size);
}
/* Copy the new data into buf. */
memcpy(w->buf + w->buf_filled, data, size);
w->buf_filled += size;
return 0;
}
static int
emit_buf_full(struct spdk_json_write_ctx *w, const void *data, size_t size)
{
size_t buf_remain = sizeof(w->buf) - w->buf_filled;
int rc;
assert(size > buf_remain);
/* Copy as much of the new data as possible into the buffer and flush it. */
memcpy(w->buf + w->buf_filled, data, buf_remain);
w->buf_filled += buf_remain;
rc = flush_buf(w);
if (rc != 0) {
return fail(w);
}
/* Recurse to emit the rest of the data. */
return emit(w, data + buf_remain, size - buf_remain);
}
static int
emit_fmt(struct spdk_json_write_ctx *w, const void *data, size_t size)
{
if (w->flags & SPDK_JSON_WRITE_FLAG_FORMATTED) {
return emit(w, data, size);
}
return 0;
}
static int
emit_indent(struct spdk_json_write_ctx *w)
{
uint32_t i;
if (w->flags & SPDK_JSON_WRITE_FLAG_FORMATTED) {
for (i = 0; i < w->indent; i++) {
if (emit(w, " ", 2)) { return fail(w); }
}
}
return 0;
}
static int
begin_value(struct spdk_json_write_ctx *w)
{
// TODO: check for value state
if (w->new_indent) {
if (emit_fmt(w, "\n", 1)) { return fail(w); }
if (emit_indent(w)) { return fail(w); }
}
if (!w->first_value) {
if (emit(w, ",", 1)) { return fail(w); }
if (emit_fmt(w, "\n", 1)) { return fail(w); }
if (emit_indent(w)) { return fail(w); }
}
w->first_value = false;
w->new_indent = false;
return 0;
}
int
spdk_json_write_val_raw(struct spdk_json_write_ctx *w, const void *data, size_t len)
{
if (begin_value(w)) { return fail(w); }
return emit(w, data, len);
}
int
spdk_json_write_null(struct spdk_json_write_ctx *w)
{
if (begin_value(w)) { return fail(w); }
return emit(w, "null", 4);
}
int
spdk_json_write_bool(struct spdk_json_write_ctx *w, bool val)
{
if (begin_value(w)) { return fail(w); }
if (val) {
return emit(w, "true", 4);
} else {
return emit(w, "false", 5);
}
}
int
spdk_json_write_int32(struct spdk_json_write_ctx *w, int32_t val)
{
char buf[32];
int count;
if (begin_value(w)) { return fail(w); }
count = snprintf(buf, sizeof(buf), "%" PRId32, val);
if (count <= 0 || (size_t)count >= sizeof(buf)) { return fail(w); }
return emit(w, buf, count);
}
int
spdk_json_write_uint32(struct spdk_json_write_ctx *w, uint32_t val)
{
char buf[32];
int count;
if (begin_value(w)) { return fail(w); }
count = snprintf(buf, sizeof(buf), "%" PRIu32, val);
if (count <= 0 || (size_t)count >= sizeof(buf)) { return fail(w); }
return emit(w, buf, count);
}
int
spdk_json_write_int64(struct spdk_json_write_ctx *w, int64_t val)
{
char buf[32];
int count;
if (begin_value(w)) { return fail(w); }
count = snprintf(buf, sizeof(buf), "%" PRId64, val);
if (count <= 0 || (size_t)count >= sizeof(buf)) { return fail(w); }
return emit(w, buf, count);
}
int
spdk_json_write_uint64(struct spdk_json_write_ctx *w, uint64_t val)
{
char buf[32];
int count;
if (begin_value(w)) { return fail(w); }
count = snprintf(buf, sizeof(buf), "%" PRIu64, val);
if (count <= 0 || (size_t)count >= sizeof(buf)) { return fail(w); }
return emit(w, buf, count);
}
static void
write_hex_4(void *dest, uint16_t val)
{
uint8_t *p = dest;
char hex[] = "0123456789ABCDEF";
p[0] = hex[(val >> 12)];
p[1] = hex[(val >> 8) & 0xF];
p[2] = hex[(val >> 4) & 0xF];
p[3] = hex[val & 0xF];
}
static inline int
write_codepoint(struct spdk_json_write_ctx *w, uint32_t codepoint)
{
static const uint8_t escapes[] = {
['\b'] = 'b',
['\f'] = 'f',
['\n'] = 'n',
['\r'] = 'r',
['\t'] = 't',
['"'] = '"',
['\\'] = '\\',
/*
* Forward slash (/) is intentionally not converted to an escape
* (it is valid unescaped).
*/
};
uint16_t high, low;
char out[13];
size_t out_len;
if (codepoint < sizeof(escapes) && escapes[codepoint]) {
out[0] = '\\';
out[1] = escapes[codepoint];
out_len = 2;
} else if (codepoint >= 0x20 && codepoint < 0x7F) {
/*
* Encode plain ASCII directly (except 0x7F, since it is really
* a control character, despite the JSON spec not considering it one).
*/
out[0] = (uint8_t)codepoint;
out_len = 1;
} else if (codepoint < 0x10000) {
out[0] = '\\';
out[1] = 'u';
write_hex_4(&out[2], (uint16_t)codepoint);
out_len = 6;
} else {
utf16_encode_surrogate_pair(codepoint, &high, &low);
out[0] = '\\';
out[1] = 'u';
write_hex_4(&out[2], high);
out[6] = '\\';
out[7] = 'u';
write_hex_4(&out[8], low);
out_len = 12;
}
return emit(w, out, out_len);
}
static int
write_string_or_name(struct spdk_json_write_ctx *w, const char *val, size_t len)
{
const uint8_t *p = val;
const uint8_t *end = val + len;
if (emit(w, "\"", 1)) { return fail(w); }
while (p != end) {
int codepoint_len;
uint32_t codepoint;
codepoint_len = utf8_valid(p, end);
switch (codepoint_len) {
case 1:
codepoint = utf8_decode_unsafe_1(p);
break;
case 2:
codepoint = utf8_decode_unsafe_2(p);
break;
case 3:
codepoint = utf8_decode_unsafe_3(p);
break;
case 4:
codepoint = utf8_decode_unsafe_4(p);
break;
default:
return fail(w);
}
if (write_codepoint(w, codepoint)) { return fail(w); }
p += codepoint_len;
}
return emit(w, "\"", 1);
}
static int
write_string_or_name_utf16le(struct spdk_json_write_ctx *w, const uint16_t *val, size_t len)
{
const uint16_t *p = val;
const uint16_t *end = val + len;
if (emit(w, "\"", 1)) { return fail(w); }
while (p != end) {
int codepoint_len;
uint32_t codepoint;
codepoint_len = utf16le_valid(p, end);
switch (codepoint_len) {
case 1:
codepoint = from_le16(&p[0]);
break;
case 2:
codepoint = utf16_decode_surrogate_pair(from_le16(&p[0]), from_le16(&p[1]));
break;
default:
return fail(w);
}
if (write_codepoint(w, codepoint)) { return fail(w); }
p += codepoint_len;
}
return emit(w, "\"", 1);
}
int
spdk_json_write_string_raw(struct spdk_json_write_ctx *w, const char *val, size_t len)
{
if (begin_value(w)) { return fail(w); }
return write_string_or_name(w, val, len);
}
int
spdk_json_write_string(struct spdk_json_write_ctx *w, const char *val)
{
return spdk_json_write_string_raw(w, val, strlen(val));
}
int
spdk_json_write_string_utf16le_raw(struct spdk_json_write_ctx *w, const uint16_t *val, size_t len)
{
if (begin_value(w)) { return fail(w); }
return write_string_or_name_utf16le(w, val, len);
}
int
spdk_json_write_string_utf16le(struct spdk_json_write_ctx *w, const uint16_t *val)
{
const uint16_t *p;
size_t len;
for (len = 0, p = val; *p; p++) {
len++;
}
return spdk_json_write_string_utf16le_raw(w, val, len);
}
int
spdk_json_write_string_fmt(struct spdk_json_write_ctx *w, const char *fmt, ...)
{
va_list args;
int rc;
va_start(args, fmt);
rc = spdk_json_write_string_fmt_v(w, fmt, args);
va_end(args);
return rc;
}
int
spdk_json_write_string_fmt_v(struct spdk_json_write_ctx *w, const char *fmt, va_list args)
{
char *s;
int rc;
s = spdk_vsprintf_alloc(fmt, args);
if (s == NULL) {
return -1;
}
rc = spdk_json_write_string(w, s);
free(s);
return rc;
}
int
spdk_json_write_array_begin(struct spdk_json_write_ctx *w)
{
if (begin_value(w)) { return fail(w); }
w->first_value = true;
w->new_indent = true;
w->indent++;
if (emit(w, "[", 1)) { return fail(w); }
return 0;
}
int
spdk_json_write_array_end(struct spdk_json_write_ctx *w)
{
w->first_value = false;
if (w->indent == 0) { return fail(w); }
w->indent--;
if (!w->new_indent) {
if (emit_fmt(w, "\n", 1)) { return fail(w); }
if (emit_indent(w)) { return fail(w); }
}
w->new_indent = false;
return emit(w, "]", 1);
}
int
spdk_json_write_object_begin(struct spdk_json_write_ctx *w)
{
if (begin_value(w)) { return fail(w); }
w->first_value = true;
w->new_indent = true;
w->indent++;
if (emit(w, "{", 1)) { return fail(w); }
return 0;
}
int
spdk_json_write_object_end(struct spdk_json_write_ctx *w)
{
w->first_value = false;
w->indent--;
if (!w->new_indent) {
if (emit_fmt(w, "\n", 1)) { return fail(w); }
if (emit_indent(w)) { return fail(w); }
}
w->new_indent = false;
return emit(w, "}", 1);
}
int
spdk_json_write_name_raw(struct spdk_json_write_ctx *w, const char *name, size_t len)
{
/* TODO: check that container is an object */
if (begin_value(w)) { return fail(w); }
if (write_string_or_name(w, name, len)) { return fail(w); }
w->first_value = true;
if (emit(w, ":", 1)) { return fail(w); }
return emit_fmt(w, " ", 1);
}
int
spdk_json_write_name(struct spdk_json_write_ctx *w, const char *name)
{
return spdk_json_write_name_raw(w, name, strlen(name));
}
int
spdk_json_write_val(struct spdk_json_write_ctx *w, const struct spdk_json_val *val)
{
size_t num_values, i;
switch (val->type) {
case SPDK_JSON_VAL_NUMBER:
return spdk_json_write_val_raw(w, val->start, val->len);
case SPDK_JSON_VAL_STRING:
return spdk_json_write_string_raw(w, val->start, val->len);
case SPDK_JSON_VAL_NAME:
return spdk_json_write_name_raw(w, val->start, val->len);
case SPDK_JSON_VAL_TRUE:
return spdk_json_write_bool(w, true);
case SPDK_JSON_VAL_FALSE:
return spdk_json_write_bool(w, false);
case SPDK_JSON_VAL_NULL:
return spdk_json_write_null(w);
case SPDK_JSON_VAL_ARRAY_BEGIN:
case SPDK_JSON_VAL_OBJECT_BEGIN:
num_values = val[0].len;
if (val[0].type == SPDK_JSON_VAL_OBJECT_BEGIN) {
if (spdk_json_write_object_begin(w)) {
return fail(w);
}
} else {
if (spdk_json_write_array_begin(w)) {
return fail(w);
}
}
// Loop up to and including the _END value
for (i = 0; i < num_values + 1;) {
if (spdk_json_write_val(w, &val[i + 1])) {
return fail(w);
}
if (val[i + 1].type == SPDK_JSON_VAL_ARRAY_BEGIN ||
val[i + 1].type == SPDK_JSON_VAL_OBJECT_BEGIN) {
i += val[i + 1].len + 2;
} else {
i++;
}
}
return 0;
case SPDK_JSON_VAL_ARRAY_END:
return spdk_json_write_array_end(w);
case SPDK_JSON_VAL_OBJECT_END:
return spdk_json_write_object_end(w);
case SPDK_JSON_VAL_INVALID:
// Handle INVALID to make the compiler happy (and catch other unhandled types)
return fail(w);
}
return fail(w);
}
int spdk_json_write_named_null(struct spdk_json_write_ctx *w, const char *name)
{
int rc = spdk_json_write_name(w, name);
return rc ? rc : spdk_json_write_null(w);
}
int spdk_json_write_named_bool(struct spdk_json_write_ctx *w, const char *name, bool val)
{
int rc = spdk_json_write_name(w, name);
return rc ? rc : spdk_json_write_bool(w, val);
}
int spdk_json_write_named_int32(struct spdk_json_write_ctx *w, const char *name, int32_t val)
{
int rc = spdk_json_write_name(w, name);
return rc ? rc : spdk_json_write_int32(w, val);
}
int spdk_json_write_named_uint32(struct spdk_json_write_ctx *w, const char *name, uint32_t val)
{
int rc = spdk_json_write_name(w, name);
return rc ? rc : spdk_json_write_uint32(w, val);
}
int spdk_json_write_named_uint64(struct spdk_json_write_ctx *w, const char *name, uint64_t val)
{
int rc = spdk_json_write_name(w, name);
return rc ? rc : spdk_json_write_uint64(w, val);
}
int spdk_json_write_named_int64(struct spdk_json_write_ctx *w, const char *name, int64_t val)
{
int rc = spdk_json_write_name(w, name);
return rc ? rc : spdk_json_write_int64(w, val);
}
int spdk_json_write_named_string(struct spdk_json_write_ctx *w, const char *name, const char *val)
{
int rc = spdk_json_write_name(w, name);
return rc ? rc : spdk_json_write_string(w, val);
}
int spdk_json_write_named_string_fmt(struct spdk_json_write_ctx *w, const char *name,
const char *fmt, ...)
{
va_list args;
int rc;
va_start(args, fmt);
rc = spdk_json_write_named_string_fmt_v(w, name, fmt, args);
va_end(args);
return rc;
}
int spdk_json_write_named_string_fmt_v(struct spdk_json_write_ctx *w, const char *name,
const char *fmt, va_list args)
{
char *s;
int rc;
rc = spdk_json_write_name(w, name);
if (rc) {
return rc;
}
s = spdk_vsprintf_alloc(fmt, args);
if (s == NULL) {
return -1;
}
rc = spdk_json_write_string(w, s);
free(s);
return rc;
}
int spdk_json_write_named_array_begin(struct spdk_json_write_ctx *w, const char *name)
{
int rc = spdk_json_write_name(w, name);
return rc ? rc : spdk_json_write_array_begin(w);
}
int spdk_json_write_named_object_begin(struct spdk_json_write_ctx *w, const char *name)
{
int rc = spdk_json_write_name(w, name);
return rc ? rc : spdk_json_write_object_begin(w);
}
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