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/*
* Copyright 2022-present MongoDB, Inc.
*
* 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 "mongocrypt-private.h"
#include "mc-writer-private.h"
#define CHECK_AND_RETURN(x) \
if (!(x)) { \
return false; \
} else \
((void)0)
#define CHECK_REMAINING_BUFFER_AND_RET(write_size) \
if ((write_size) > writer->len - writer->pos) { \
CLIENT_ERR("%s expected at most %" PRIu64 " bytes, got: %" PRIu64, \
writer->parser_name, \
(writer->len - writer->pos), \
(uint64_t)(write_size)); \
return false; \
} else \
((void)0)
void mc_writer_init(mc_writer_t *writer, uint8_t *ptr, uint64_t len, const char *parser_name) {
BSON_ASSERT_PARAM(writer);
BSON_ASSERT_PARAM(ptr);
BSON_ASSERT_PARAM(parser_name);
*writer = (mc_writer_t){.pos = 0u, .ptr = ptr, .len = len, .parser_name = parser_name};
}
void mc_writer_init_from_buffer(mc_writer_t *writer, _mongocrypt_buffer_t *buf, const char *parser_name) {
BSON_ASSERT_PARAM(writer);
BSON_ASSERT_PARAM(buf);
BSON_ASSERT_PARAM(parser_name);
mc_writer_init(writer, buf->data, buf->len, parser_name);
}
mc_writer_t *mc_writer_new(uint8_t *ptr, uint64_t len, const char *parser_name) {
BSON_ASSERT_PARAM(ptr);
BSON_ASSERT_PARAM(parser_name);
mc_writer_t *writer = bson_malloc(sizeof(mc_writer_t));
mc_writer_init(writer, ptr, len, parser_name);
return writer;
}
void mc_writer_destroy(mc_writer_t *writer) {
bson_free(writer);
}
bool mc_writer_write_u8(mc_writer_t *writer, const uint8_t value, mongocrypt_status_t *status) {
BSON_ASSERT_PARAM(writer);
CHECK_REMAINING_BUFFER_AND_RET(sizeof(uint8_t));
memcpy(writer->ptr + writer->pos, &value, sizeof(uint8_t));
writer->pos += sizeof(uint8_t);
return true;
}
bool mc_writer_write_u32(mc_writer_t *writer, const uint32_t value, mongocrypt_status_t *status) {
CHECK_REMAINING_BUFFER_AND_RET(sizeof(uint32_t));
uint32_t temp = BSON_UINT32_TO_LE(value);
memcpy(writer->ptr + writer->pos, &temp, sizeof(uint32_t));
writer->pos += sizeof(uint32_t);
return true;
}
bool mc_writer_write_u64(mc_writer_t *writer, const uint64_t value, mongocrypt_status_t *status) {
CHECK_REMAINING_BUFFER_AND_RET(sizeof(uint64_t));
uint64_t temp = BSON_UINT64_TO_LE(value);
memcpy(writer->ptr + writer->pos, &temp, sizeof(uint64_t));
writer->pos += sizeof(uint64_t);
return true;
}
bool mc_writer_write_buffer(mc_writer_t *writer,
const _mongocrypt_buffer_t *buf,
uint64_t length,
mongocrypt_status_t *status) {
BSON_ASSERT_PARAM(writer);
BSON_ASSERT_PARAM(buf);
if (length > buf->len) {
CLIENT_ERR("%s cannot write %" PRIu64 " bytes from buffer with length %" PRIu32,
writer->parser_name,
length,
buf->len);
return false;
}
CHECK_REMAINING_BUFFER_AND_RET(length);
if (length > SIZE_MAX) {
CLIENT_ERR("%s failed to copy "
"data of length %" PRIu64,
writer->parser_name,
length);
return false;
}
memcpy(writer->ptr + writer->pos, buf->data, (size_t)length);
writer->pos += length;
return true;
}
bool mc_writer_write_uuid_buffer(mc_writer_t *writer, const _mongocrypt_buffer_t *buf, mongocrypt_status_t *status) {
BSON_ASSERT_PARAM(writer);
BSON_ASSERT_PARAM(buf);
CHECK_AND_RETURN(mc_writer_write_buffer(writer, buf, UUID_LEN, status));
return true;
}
bool mc_writer_write_prfblock_buffer(mc_writer_t *writer,
const _mongocrypt_buffer_t *buf,
mongocrypt_status_t *status) {
BSON_ASSERT_PARAM(writer);
BSON_ASSERT_PARAM(buf);
CHECK_AND_RETURN(mc_writer_write_buffer(writer, buf, PRF_LEN, status));
return true;
}
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