[deliverable/lttng-modules.git] / src / lib / msgpack / msgpack.c

/*
 * msgpack.c
 *
 * Copyright (C) 2020 Francis Deslauriers <francis.deslauriers@efficios.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; only
 * version 2.1 of the License.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#define _GNU_SOURCE
#define _LGPL_SOURCE
#include <stddef.h>

#define MSGPACK_FIXSTR_ID_MASK		0xA0
#define MSGPACK_FIXMAP_ID_MASK		0x80
#define MSGPACK_FIXARRAY_ID_MASK	0x90

#define MSGPACK_NIL_ID		0xC0
#define MSGPACK_FALSE_ID	0xC2
#define MSGPACK_TRUE_ID		0xC3
#define MSGPACK_MAP16_ID	0xDE
#define MSGPACK_ARRAY16_ID	0xDC

#define MSGPACK_UINT8_ID	0xCC
#define MSGPACK_UINT16_ID	0xCD
#define MSGPACK_UINT32_ID	0xCE
#define MSGPACK_UINT64_ID	0xCF

#define MSGPACK_INT8_ID		0xD0
#define MSGPACK_INT16_ID	0xD1
#define MSGPACK_INT32_ID	0xD2
#define MSGPACK_INT64_ID	0xD3

#define MSGPACK_FLOAT64_ID	0xCB
#define MSGPACK_STR16_ID	0xDA

#define MSGPACK_FIXINT_MAX		((1 << 7) - 1)
#define MSGPACK_FIXINT_MIN		-(1 << 5)
#define MSGPACK_FIXMAP_MAX_COUNT	15
#define MSGPACK_FIXARRAY_MAX_COUNT	15
#define MSGPACK_FIXSTR_MAX_LENGTH	31

#ifdef __KERNEL__
#include <linux/bug.h>
#include <linux/string.h>
#include <linux/types.h>
#include <asm/byteorder.h>

#include <lttng/msgpack.h>

#define INT8_MIN		(-128)
#define INT16_MIN		(-32767-1)
#define INT32_MIN		(-2147483647-1)
#define INT8_MAX		(127)
#define INT16_MAX		(32767)
#define INT32_MAX		(2147483647)
#define UINT8_MAX		(255)
#define UINT16_MAX		(65535)
#define UINT32_MAX		(4294967295U)

#define byteswap_host_to_be16(_tmp) cpu_to_be16(_tmp)
#define byteswap_host_to_be32(_tmp) cpu_to_be32(_tmp)
#define byteswap_host_to_be64(_tmp) cpu_to_be64(_tmp)

#define lttng_msgpack_assert(cond) WARN_ON(!(cond))

#else /* __KERNEL__ */

#include <endian.h>
#include <stdio.h>
#include <string.h>

#include "msgpack.h"

#define byteswap_host_to_be16(_tmp) htobe16(_tmp)
#define byteswap_host_to_be32(_tmp) htobe32(_tmp)
#define byteswap_host_to_be64(_tmp) htobe64(_tmp)

#define lttng_msgpack_assert(cond) ({ \
	if (!(cond)) \
		fprintf(stderr, "Assertion failed. %s:%d\n", __FILE__, __LINE__); \
	})
#endif /* __KERNEL__ */

static inline int lttng_msgpack_append_buffer(
		struct lttng_msgpack_writer *writer,
		const uint8_t *buf,
		size_t length)
{
	int ret = 0;

	lttng_msgpack_assert(buf);

	/* Ensure we are not trying to write after the end of the buffer. */
	if (writer->write_pos + length > writer->end_write_pos) {
		ret = -1;
		goto end;
	}

	memcpy(writer->write_pos, buf, length);
	writer->write_pos += length;
end:
	return ret;
}

static inline int lttng_msgpack_append_u8(
		struct lttng_msgpack_writer *writer, uint8_t value)
{
	return lttng_msgpack_append_buffer(writer, &value, sizeof(value));
}

static inline int lttng_msgpack_append_u16(
		struct lttng_msgpack_writer *writer, uint16_t value)
{
	value = byteswap_host_to_be16(value);

	return lttng_msgpack_append_buffer(writer, (uint8_t *) &value, sizeof(value));
}

static inline int lttng_msgpack_append_u32(
		struct lttng_msgpack_writer *writer, uint32_t value)
{
	value = byteswap_host_to_be32(value);

	return lttng_msgpack_append_buffer(writer, (uint8_t *) &value, sizeof(value));
}

static inline int lttng_msgpack_append_u64(
		struct lttng_msgpack_writer *writer, uint64_t value)
{
	value = byteswap_host_to_be64(value);

	return lttng_msgpack_append_buffer(writer, (uint8_t *) &value, sizeof(value));
}

static inline int lttng_msgpack_append_i8(
		struct lttng_msgpack_writer *writer, int8_t value)
{
	return lttng_msgpack_append_u8(writer, (uint8_t) value);
}

static inline int lttng_msgpack_append_i16(
		struct lttng_msgpack_writer *writer, int16_t value)
{
	return lttng_msgpack_append_u16(writer, (uint16_t) value);
}

static inline int lttng_msgpack_append_i32(
		struct lttng_msgpack_writer *writer, int32_t value)
{
	return lttng_msgpack_append_u32(writer, (uint32_t) value);
}

static inline int lttng_msgpack_append_i64(
		struct lttng_msgpack_writer *writer, int64_t value)
{
	return lttng_msgpack_append_u64(writer, (uint64_t) value);
}

static inline int lttng_msgpack_encode_fixmap(
		struct lttng_msgpack_writer *writer, uint8_t count)
{
	int ret = 0;

	lttng_msgpack_assert(count <= MSGPACK_FIXMAP_MAX_COUNT);

	ret = lttng_msgpack_append_u8(writer, MSGPACK_FIXMAP_ID_MASK | count);
	if (ret)
		goto end;

end:
	return ret;
}

static inline int lttng_msgpack_encode_map16(
		struct lttng_msgpack_writer *writer, uint16_t count)
{
	int ret;

	lttng_msgpack_assert(count > MSGPACK_FIXMAP_MAX_COUNT);

	ret = lttng_msgpack_append_u8(writer, MSGPACK_MAP16_ID);
	if (ret)
		goto end;

	ret = lttng_msgpack_append_u16(writer, count);
	if (ret)
		goto end;

end:
	return ret;
}

static inline int lttng_msgpack_encode_fixarray(
		struct lttng_msgpack_writer *writer, uint8_t count)
{
	int ret = 0;

	lttng_msgpack_assert(count <= MSGPACK_FIXARRAY_MAX_COUNT);

	ret = lttng_msgpack_append_u8(writer, MSGPACK_FIXARRAY_ID_MASK | count);
	if (ret)
		goto end;

end:
	return ret;
}

static inline int lttng_msgpack_encode_array16(
		struct lttng_msgpack_writer *writer, uint16_t count)
{
	int ret;

	lttng_msgpack_assert(count > MSGPACK_FIXARRAY_MAX_COUNT);

	ret = lttng_msgpack_append_u8(writer, MSGPACK_ARRAY16_ID);
	if (ret)
		goto end;

	ret = lttng_msgpack_append_u16(writer, count);
	if (ret)
		goto end;

end:
	return ret;
}

static inline int lttng_msgpack_encode_fixstr(
		struct lttng_msgpack_writer *writer,
		const char *str,
		uint8_t len)
{
	int ret;

	lttng_msgpack_assert(len <= MSGPACK_FIXSTR_MAX_LENGTH);

	ret = lttng_msgpack_append_u8(writer, MSGPACK_FIXSTR_ID_MASK | len);
	if (ret)
		goto end;

	ret = lttng_msgpack_append_buffer(writer, (uint8_t *) str, len);
	if (ret)
		goto end;

end:
	return ret;
}

static inline int lttng_msgpack_encode_str16(
		struct lttng_msgpack_writer *writer,
		const char *str,
		uint16_t len)
{
	int ret;

	lttng_msgpack_assert(len > MSGPACK_FIXSTR_MAX_LENGTH);

	ret = lttng_msgpack_append_u8(writer, MSGPACK_STR16_ID);
	if (ret)
		goto end;

	ret = lttng_msgpack_append_u16(writer, len);
	if (ret)
		goto end;

	ret = lttng_msgpack_append_buffer(writer, (uint8_t *) str, len);
	if (ret)
		goto end;

end:
	return ret;
}

int lttng_msgpack_begin_map(struct lttng_msgpack_writer *writer, size_t count)
{
	int ret;

	if (count >= (1 << 16)) {
		ret = -1;
		goto end;
	}

	if (count <= MSGPACK_FIXMAP_MAX_COUNT)
		ret = lttng_msgpack_encode_fixmap(writer, count);
	else
		ret = lttng_msgpack_encode_map16(writer, count);

	writer->map_nesting++;
end:
	return ret;
}

int lttng_msgpack_end_map(struct lttng_msgpack_writer *writer)
{
	lttng_msgpack_assert(writer->map_nesting > 0);
	writer->map_nesting--;
	return 0;
}

int lttng_msgpack_begin_array(
		struct lttng_msgpack_writer *writer, size_t count)
{
	int ret;

	if (count >= (1 << 16)) {
		ret = -1;
		goto end;
	}

	if (count <= MSGPACK_FIXARRAY_MAX_COUNT)
		ret = lttng_msgpack_encode_fixarray(writer, count);
	else
		ret = lttng_msgpack_encode_array16(writer, count);

	writer->array_nesting++;
end:
	return ret;
}

int lttng_msgpack_end_array(struct lttng_msgpack_writer *writer)
{
	lttng_msgpack_assert(writer->array_nesting > 0);
	writer->array_nesting--;
	return 0;
}

int lttng_msgpack_write_str(struct lttng_msgpack_writer *writer,
		const char *str)
{
	int ret;
	size_t length = strlen(str);

	if (length >= (1 << 16)) {
		ret = -1;
		goto end;
	}

	if (length <= MSGPACK_FIXSTR_MAX_LENGTH)
		ret = lttng_msgpack_encode_fixstr(writer, str, length);
	else
		ret = lttng_msgpack_encode_str16(writer, str, length);

end:
	return ret;
}

int lttng_msgpack_write_nil(struct lttng_msgpack_writer *writer)
{
	return lttng_msgpack_append_u8(writer, MSGPACK_NIL_ID);
}

int lttng_msgpack_write_true(struct lttng_msgpack_writer *writer)
{
	return lttng_msgpack_append_u8(writer, MSGPACK_TRUE_ID);
}

int lttng_msgpack_write_false(struct lttng_msgpack_writer *writer)
{
	return lttng_msgpack_append_u8(writer, MSGPACK_FALSE_ID);
}

int lttng_msgpack_write_unsigned_integer(
		struct lttng_msgpack_writer *writer, uint64_t value)
{
	int ret = 0;

	if (value <= MSGPACK_FIXINT_MAX) {
		ret = lttng_msgpack_append_u8(writer, (uint8_t) value);
		if (ret)
			goto end;
	} else if (value <= UINT8_MAX) {
		ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT8_ID);
		if (ret)
			goto end;

		ret = lttng_msgpack_append_u8(writer, (uint8_t) value);
		if (ret)
			goto end;
	} else if (value <= UINT16_MAX) {
		ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT16_ID);
		if (ret)
			goto end;

		ret = lttng_msgpack_append_u16(writer, (uint16_t) value);
		if (ret)
			goto end;
	} else if (value <= UINT32_MAX) {
		ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT32_ID);
		if (ret)
			goto end;

		ret = lttng_msgpack_append_u32(writer, (uint32_t) value);
		if (ret)
			goto end;
	} else {
		ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT64_ID);
		if (ret)
			goto end;

		ret = lttng_msgpack_append_u64(writer, value);
		if (ret)
			goto end;
	}

end:
	return ret;
}

int lttng_msgpack_write_signed_integer(struct lttng_msgpack_writer *writer, int64_t value)
{
	int ret;

	if (value >= MSGPACK_FIXINT_MIN && value <= MSGPACK_FIXINT_MAX){
		ret = lttng_msgpack_append_i8(writer, (int8_t) value);
		if (ret)
			goto end;
	} else if (value >= INT8_MIN && value <= INT8_MAX) {
		ret = lttng_msgpack_append_u8(writer, MSGPACK_INT8_ID);
		if (ret)
			goto end;

		ret = lttng_msgpack_append_i8(writer, (int8_t) value);
		if (ret)
			goto end;
	} else if (value >= INT16_MIN && value <= INT16_MAX) {
		ret = lttng_msgpack_append_u8(writer, MSGPACK_INT16_ID);
		if (ret)
			goto end;

		ret = lttng_msgpack_append_i16(writer, (int16_t) value);
		if (ret)
			goto end;
	} else if (value >= INT32_MIN && value <= INT32_MAX) {
		ret = lttng_msgpack_append_u8(writer, MSGPACK_INT32_ID);
		if (ret)
			goto end;

		ret = lttng_msgpack_append_i32(writer, (int32_t) value);
		if (ret)
			goto end;
	} else {
		ret = lttng_msgpack_append_u8(writer, MSGPACK_INT64_ID);
		if (ret)
			goto end;

		ret = lttng_msgpack_append_i64(writer, value);
		if (ret)
			goto end;
	}

end:
	return ret;
}

void lttng_msgpack_writer_init(struct lttng_msgpack_writer *writer,
		uint8_t *buffer, size_t size)
{
	lttng_msgpack_assert(buffer);
	lttng_msgpack_assert(size >= 0);

	writer->buffer = buffer;
	writer->write_pos = buffer;
	writer->end_write_pos = buffer + size;

	writer->array_nesting = 0;
	writer->map_nesting = 0;
}

void lttng_msgpack_writer_fini(struct lttng_msgpack_writer *writer)
{
	memset(writer, 0, sizeof(*writer));
}
Commit	Line	Data
7ab8c616 FD	1	/*
	2	* msgpack.c
	3	*
	4	* Copyright (C) 2020 Francis Deslauriers <francis.deslauriers@efficios.com>
	5	*
	6	* This library is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; only
	9	* version 2.1 of the License.
	10	*
	11	* This library is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Lesser General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Lesser General Public
	17	* License along with this library; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#define _GNU_SOURCE
	22	#define _LGPL_SOURCE
	23	#include <stddef.h>
	24
	25	#define MSGPACK_FIXSTR_ID_MASK 0xA0
	26	#define MSGPACK_FIXMAP_ID_MASK 0x80
	27	#define MSGPACK_FIXARRAY_ID_MASK 0x90
	28
	29	#define MSGPACK_NIL_ID 0xC0
	30	#define MSGPACK_FALSE_ID 0xC2
	31	#define MSGPACK_TRUE_ID 0xC3
	32	#define MSGPACK_MAP16_ID 0xDE
	33	#define MSGPACK_ARRAY16_ID 0xDC
	34
	35	#define MSGPACK_UINT8_ID 0xCC
	36	#define MSGPACK_UINT16_ID 0xCD
	37	#define MSGPACK_UINT32_ID 0xCE
	38	#define MSGPACK_UINT64_ID 0xCF
	39
	40	#define MSGPACK_INT8_ID 0xD0
	41	#define MSGPACK_INT16_ID 0xD1
	42	#define MSGPACK_INT32_ID 0xD2
	43	#define MSGPACK_INT64_ID 0xD3
	44
	45	#define MSGPACK_FLOAT64_ID 0xCB
	46	#define MSGPACK_STR16_ID 0xDA
	47
	48	#define MSGPACK_FIXINT_MAX ((1 << 7) - 1)
	49	#define MSGPACK_FIXINT_MIN -(1 << 5)
	50	#define MSGPACK_FIXMAP_MAX_COUNT 15
	51	#define MSGPACK_FIXARRAY_MAX_COUNT 15
	52	#define MSGPACK_FIXSTR_MAX_LENGTH 31
	53
	54	#ifdef __KERNEL__
	55	#include <linux/bug.h>
	56	#include <linux/string.h>
	57	#include <linux/types.h>
caf6ac49	58	#include <asm/byteorder.h>
7ab8c616 FD	59
	60	#include <lttng/msgpack.h>
	61
	62	#define INT8_MIN (-128)
	63	#define INT16_MIN (-32767-1)
	64	#define INT32_MIN (-2147483647-1)
	65	#define INT8_MAX (127)
	66	#define INT16_MAX (32767)
	67	#define INT32_MAX (2147483647)
	68	#define UINT8_MAX (255)
	69	#define UINT16_MAX (65535)
	70	#define UINT32_MAX (4294967295U)
	71
	72	#define byteswap_host_to_be16(_tmp) cpu_to_be16(_tmp)
	73	#define byteswap_host_to_be32(_tmp) cpu_to_be32(_tmp)
	74	#define byteswap_host_to_be64(_tmp) cpu_to_be64(_tmp)
	75
	76	#define lttng_msgpack_assert(cond) WARN_ON(!(cond))
	77
	78	#else /* __KERNEL__ */
	79
	80	#include <endian.h>
	81	#include <stdio.h>
	82	#include <string.h>
	83
	84	#include "msgpack.h"
	85
	86	#define byteswap_host_to_be16(_tmp) htobe16(_tmp)
	87	#define byteswap_host_to_be32(_tmp) htobe32(_tmp)
	88	#define byteswap_host_to_be64(_tmp) htobe64(_tmp)
	89
	90	#define lttng_msgpack_assert(cond) ({ \
	91	if (!(cond)) \
	92	fprintf(stderr, "Assertion failed. %s:%d\n", __FILE__, __LINE__); \
	93	})
	94	#endif /* __KERNEL__ */
	95
	96	static inline int lttng_msgpack_append_buffer(
	97	struct lttng_msgpack_writer *writer,
	98	const uint8_t *buf,
	99	size_t length)
	100	{
	101	int ret = 0;
	102
	103	lttng_msgpack_assert(buf);
	104
	105	/* Ensure we are not trying to write after the end of the buffer. */
	106	if (writer->write_pos + length > writer->end_write_pos) {
	107	ret = -1;
	108	goto end;
	109	}
	110
	111	memcpy(writer->write_pos, buf, length);
	112	writer->write_pos += length;
	113	end:
	114	return ret;
	115	}
	116
	117	static inline int lttng_msgpack_append_u8(
	118	struct lttng_msgpack_writer *writer, uint8_t value)
	119	{
	120	return lttng_msgpack_append_buffer(writer, &value, sizeof(value));
	121	}
	122
123	static inline int lttng_msgpack_append_u16(
124	struct lttng_msgpack_writer *writer, uint16_t value)
125	{
126	value = byteswap_host_to_be16(value);
127
128	return lttng_msgpack_append_buffer(writer, (uint8_t *) &value, sizeof(value));
129	}
130
131	static inline int lttng_msgpack_append_u32(
132	struct lttng_msgpack_writer *writer, uint32_t value)
133	{
134	value = byteswap_host_to_be32(value);
135
136	return lttng_msgpack_append_buffer(writer, (uint8_t *) &value, sizeof(value));
137	}
138
139	static inline int lttng_msgpack_append_u64(
140	struct lttng_msgpack_writer *writer, uint64_t value)
141	{
142	value = byteswap_host_to_be64(value);
143
144	return lttng_msgpack_append_buffer(writer, (uint8_t *) &value, sizeof(value));
145	}
146
7ab8c616 FD	147	static inline int lttng_msgpack_append_i8(
	148	struct lttng_msgpack_writer *writer, int8_t value)
	149	{
	150	return lttng_msgpack_append_u8(writer, (uint8_t) value);
	151	}
	152
	153	static inline int lttng_msgpack_append_i16(
	154	struct lttng_msgpack_writer *writer, int16_t value)
	155	{
	156	return lttng_msgpack_append_u16(writer, (uint16_t) value);
	157	}
	158
	159	static inline int lttng_msgpack_append_i32(
	160	struct lttng_msgpack_writer *writer, int32_t value)
	161	{
	162	return lttng_msgpack_append_u32(writer, (uint32_t) value);
	163	}
	164
	165	static inline int lttng_msgpack_append_i64(
	166	struct lttng_msgpack_writer *writer, int64_t value)
	167	{
	168	return lttng_msgpack_append_u64(writer, (uint64_t) value);
	169	}
	170
7ab8c616 FD	171	static inline int lttng_msgpack_encode_fixmap(
	172	struct lttng_msgpack_writer *writer, uint8_t count)
	173	{
	174	int ret = 0;
	175
	176	lttng_msgpack_assert(count <= MSGPACK_FIXMAP_MAX_COUNT);
	177
	178	ret = lttng_msgpack_append_u8(writer, MSGPACK_FIXMAP_ID_MASK \| count);
	179	if (ret)
	180	goto end;
	181
	182	end:
	183	return ret;
	184	}
	185
	186	static inline int lttng_msgpack_encode_map16(
	187	struct lttng_msgpack_writer *writer, uint16_t count)
	188	{
	189	int ret;
	190
	191	lttng_msgpack_assert(count > MSGPACK_FIXMAP_MAX_COUNT);
	192
	193	ret = lttng_msgpack_append_u8(writer, MSGPACK_MAP16_ID);
	194	if (ret)
	195	goto end;
	196
	197	ret = lttng_msgpack_append_u16(writer, count);
	198	if (ret)
	199	goto end;
	200
	201	end:
	202	return ret;
	203	}
	204
	205	static inline int lttng_msgpack_encode_fixarray(
	206	struct lttng_msgpack_writer *writer, uint8_t count)
	207	{
	208	int ret = 0;
	209
	210	lttng_msgpack_assert(count <= MSGPACK_FIXARRAY_MAX_COUNT);
	211
	212	ret = lttng_msgpack_append_u8(writer, MSGPACK_FIXARRAY_ID_MASK \| count);
	213	if (ret)
	214	goto end;
	215
	216	end:
	217	return ret;
	218	}
	219
	220	static inline int lttng_msgpack_encode_array16(
	221	struct lttng_msgpack_writer *writer, uint16_t count)
	222	{
	223	int ret;
	224
	225	lttng_msgpack_assert(count > MSGPACK_FIXARRAY_MAX_COUNT);
	226
	227	ret = lttng_msgpack_append_u8(writer, MSGPACK_ARRAY16_ID);
	228	if (ret)
	229	goto end;
	230
	231	ret = lttng_msgpack_append_u16(writer, count);
	232	if (ret)
	233	goto end;
	234
235	end:
236	return ret;
237	}
238
239	static inline int lttng_msgpack_encode_fixstr(
240	struct lttng_msgpack_writer *writer,
241	const char *str,
242	uint8_t len)
243	{
244	int ret;
245
246	lttng_msgpack_assert(len <= MSGPACK_FIXSTR_MAX_LENGTH);
247
248	ret = lttng_msgpack_append_u8(writer, MSGPACK_FIXSTR_ID_MASK \| len);
249	if (ret)
250	goto end;
251
252	ret = lttng_msgpack_append_buffer(writer, (uint8_t *) str, len);
253	if (ret)
254	goto end;
255
256	end:
257	return ret;
258	}
259
260	static inline int lttng_msgpack_encode_str16(
261	struct lttng_msgpack_writer *writer,
262	const char *str,
263	uint16_t len)
264	{
265	int ret;
266
267	lttng_msgpack_assert(len > MSGPACK_FIXSTR_MAX_LENGTH);
268
269	ret = lttng_msgpack_append_u8(writer, MSGPACK_STR16_ID);
270	if (ret)
271	goto end;
272
273	ret = lttng_msgpack_append_u16(writer, len);
274	if (ret)
275	goto end;
276
277	ret = lttng_msgpack_append_buffer(writer, (uint8_t *) str, len);
278	if (ret)
279	goto end;
280
281	end:
282	return ret;
283	}
284
285	int lttng_msgpack_begin_map(struct lttng_msgpack_writer *writer, size_t count)
286	{
287	int ret;
288
9b6ae9f6	289	if (count >= (1 << 16)) {
7ab8c616 FD	290	ret = -1;
	291	goto end;
	292	}
	293
	294	if (count <= MSGPACK_FIXMAP_MAX_COUNT)
	295	ret = lttng_msgpack_encode_fixmap(writer, count);
	296	else
	297	ret = lttng_msgpack_encode_map16(writer, count);
	298
	299	writer->map_nesting++;
	300	end:
	301	return ret;
	302	}
	303
	304	int lttng_msgpack_end_map(struct lttng_msgpack_writer *writer)
	305	{
	306	lttng_msgpack_assert(writer->map_nesting > 0);
	307	writer->map_nesting--;
	308	return 0;
	309	}
	310
	311	int lttng_msgpack_begin_array(
	312	struct lttng_msgpack_writer *writer, size_t count)
	313	{
	314	int ret;
	315
9b6ae9f6	316	if (count >= (1 << 16)) {
7ab8c616 FD	317	ret = -1;
	318	goto end;
	319	}
	320
	321	if (count <= MSGPACK_FIXARRAY_MAX_COUNT)
	322	ret = lttng_msgpack_encode_fixarray(writer, count);
	323	else
	324	ret = lttng_msgpack_encode_array16(writer, count);
	325
	326	writer->array_nesting++;
	327	end:
	328	return ret;
	329	}
	330
	331	int lttng_msgpack_end_array(struct lttng_msgpack_writer *writer)
	332	{
	333	lttng_msgpack_assert(writer->array_nesting > 0);
	334	writer->array_nesting--;
	335	return 0;
	336	}
	337
	338	int lttng_msgpack_write_str(struct lttng_msgpack_writer *writer,
	339	const char *str)
	340	{
	341	int ret;
	342	size_t length = strlen(str);
9b6ae9f6 MD	343
9b6ae9f6 MD	344	if (length >= (1 << 16)) {
7ab8c616 FD	345	ret = -1;
	346	goto end;
	347	}
	348
	349	if (length <= MSGPACK_FIXSTR_MAX_LENGTH)
	350	ret = lttng_msgpack_encode_fixstr(writer, str, length);
	351	else
	352	ret = lttng_msgpack_encode_str16(writer, str, length);
	353
	354	end:
	355	return ret;
	356	}
	357
	358	int lttng_msgpack_write_nil(struct lttng_msgpack_writer *writer)
	359	{
	360	return lttng_msgpack_append_u8(writer, MSGPACK_NIL_ID);
	361	}
	362
	363	int lttng_msgpack_write_true(struct lttng_msgpack_writer *writer)
	364	{
	365	return lttng_msgpack_append_u8(writer, MSGPACK_TRUE_ID);
	366	}
	367
	368	int lttng_msgpack_write_false(struct lttng_msgpack_writer *writer)
	369	{
	370	return lttng_msgpack_append_u8(writer, MSGPACK_FALSE_ID);
	371	}
	372
	373	int lttng_msgpack_write_unsigned_integer(
	374	struct lttng_msgpack_writer *writer, uint64_t value)
	375	{
	376	int ret = 0;
	377
	378	if (value <= MSGPACK_FIXINT_MAX) {
	379	ret = lttng_msgpack_append_u8(writer, (uint8_t) value);
	380	if (ret)
	381	goto end;
	382	} else if (value <= UINT8_MAX) {
	383	ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT8_ID);
	384	if (ret)
	385	goto end;
	386
	387	ret = lttng_msgpack_append_u8(writer, (uint8_t) value);
	388	if (ret)
	389	goto end;
	390	} else if (value <= UINT16_MAX) {
	391	ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT16_ID);
	392	if (ret)
	393	goto end;
	394
	395	ret = lttng_msgpack_append_u16(writer, (uint16_t) value);
	396	if (ret)
	397	goto end;
	398	} else if (value <= UINT32_MAX) {
	399	ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT32_ID);
	400	if (ret)
	401	goto end;
	402
	403	ret = lttng_msgpack_append_u32(writer, (uint32_t) value);
	404	if (ret)
	405	goto end;
	406	} else {
	407	ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT64_ID);
	408	if (ret)
409	goto end;
410
411	ret = lttng_msgpack_append_u64(writer, value);
412	if (ret)
413	goto end;
414	}
415
416	end:
417	return ret;
418	}
419
420	int lttng_msgpack_write_signed_integer(struct lttng_msgpack_writer *writer, int64_t value)
421	{
422	int ret;
423
424	if (value >= MSGPACK_FIXINT_MIN && value <= MSGPACK_FIXINT_MAX){
425	ret = lttng_msgpack_append_i8(writer, (int8_t) value);
426	if (ret)
427	goto end;
428	} else if (value >= INT8_MIN && value <= INT8_MAX) {
429	ret = lttng_msgpack_append_u8(writer, MSGPACK_INT8_ID);
430	if (ret)
431	goto end;
432
433	ret = lttng_msgpack_append_i8(writer, (int8_t) value);
434	if (ret)
435	goto end;
436	} else if (value >= INT16_MIN && value <= INT16_MAX) {
437	ret = lttng_msgpack_append_u8(writer, MSGPACK_INT16_ID);
438	if (ret)
439	goto end;
440
441	ret = lttng_msgpack_append_i16(writer, (int16_t) value);
442	if (ret)
443	goto end;
444	} else if (value >= INT32_MIN && value <= INT32_MAX) {
445	ret = lttng_msgpack_append_u8(writer, MSGPACK_INT32_ID);
446	if (ret)
447	goto end;
448
449	ret = lttng_msgpack_append_i32(writer, (int32_t) value);
450	if (ret)
451	goto end;
452	} else {
453	ret = lttng_msgpack_append_u8(writer, MSGPACK_INT64_ID);
454	if (ret)
455	goto end;
456
457	ret = lttng_msgpack_append_i64(writer, value);
458	if (ret)
459	goto end;
460	}
461
462	end:
463	return ret;
464	}
465
7ab8c616 FD	466	void lttng_msgpack_writer_init(struct lttng_msgpack_writer *writer,
	467	uint8_t *buffer, size_t size)
	468	{
	469	lttng_msgpack_assert(buffer);
	470	lttng_msgpack_assert(size >= 0);
	471
	472	writer->buffer = buffer;
	473	writer->write_pos = buffer;
	474	writer->end_write_pos = buffer + size;
	475
	476	writer->array_nesting = 0;
	477	writer->map_nesting = 0;
	478	}
	479
	480	void lttng_msgpack_writer_fini(struct lttng_msgpack_writer *writer)
	481	{
	482	memset(writer, 0, sizeof(*writer));
	483	}