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/*
* buffer.c: SSH buffer
* Copyright (C) 2018 Iru Cai <mytbk920423@gmail.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; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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
*/
#include "buffer.h"
#include "ssh_endian.h"
#define INITSIZE 2048
int buffer_init(buffer *b)
{
b->p = (uint8_t *)malloc(INITSIZE);
if (b->p) {
b->alloc = INITSIZE;
b->offs = 0;
b->sz = 0;
return 1;
} else {
return 0;
}
}
static int ensure(buffer *b, size_t len)
{
if (b->offs + b->sz + len <= b->alloc)
return 1;
uint8_t *r = (uint8_t *)realloc(b->p, (b->alloc + len) * 2);
if (r == NULL)
return 0;
b->alloc = (b->alloc + len) * 2;
b->p = r;
return 1;
}
int buffer_append(buffer *b, const uint8_t *s, size_t len)
{
if (ensure(b, len)) {
if (s != NULL)
memcpy(b->p + b->offs + b->sz, s, len);
b->sz += len;
return 1;
} else {
return 0;
}
}
int buffer_append_string(buffer *b, const char *s, size_t len)
{
uint32_t beint = htobe32(len);
if (ensure(b, len + 4)) {
*(uint32_t *)(b->p + b->offs + b->sz) = beint;
memcpy(b->p + b->offs + b->sz + 4, s, len);
b->sz += len + 4;
return 1;
} else {
return 0;
}
}
int buffer_append_byte(buffer *b, uint8_t x)
{
if (ensure(b, 1)) {
b->p[b->offs + b->sz] = x;
b->sz += 1;
} else {
return 0;
}
}
int buffer_append_be16(buffer *b, uint16_t x)
{
uint16_t beint = htobe16(x);
if (ensure(b, 2)) {
*(uint16_t *)(b->p + b->offs + b->sz) = beint;
b->sz += 2;
} else {
return 0;
}
}
int buffer_append_be32(buffer *b, uint32_t x)
{
uint32_t beint = htobe32(x);
if (ensure(b, 4)) {
*(uint32_t *)(b->p + b->offs + b->sz) = beint;
b->sz += 4;
} else {
return 0;
}
}
void buffer_get(buffer *b, uint8_t *s, size_t len)
{
memcpy(s, buffer_data(b), len);
buffer_consume(b, len);
}
uint8_t buffer_get_u8(buffer *b)
{
uint8_t c = *buffer_data(b);
buffer_consume(b, 1);
return c;
}
uint16_t buffer_get_u16(buffer *b)
{
uint16_t u = be16toh(*(uint16_t *)buffer_data(b));
buffer_consume(b, 2);
return u;
}
uint32_t buffer_get_u32(buffer *b)
{
uint32_t u = be32toh(*(uint32_t *)buffer_data(b));
buffer_consume(b, 4);
return u;
}
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