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/* Copyright (c) 2002-2016 Pigeonhole authors, see the included COPYING file
*/
#include "lib.h"
#include "str.h"
#include "str-sanitize.h"
#include "mempool.h"
#include "buffer.h"
#include "hash.h"
#include "array.h"
#include "ostream.h"
#include "sieve-common.h"
#include "sieve-error.h"
#include "sieve-extensions.h"
#include "sieve-code.h"
#include "sieve-script.h"
#include "sieve-binary-private.h"
/*
* Forward declarations
*/
static inline sieve_size_t sieve_binary_emit_dynamic_data
(struct sieve_binary_block *sblock, const void *data, size_t size);
/*
* Emission functions
*/
/* Low-level emission functions */
static inline void _sieve_binary_emit_data
(struct sieve_binary_block *sblock, const void *data, sieve_size_t size)
{
buffer_append(sblock->data, data, size);
}
static inline void _sieve_binary_emit_byte
(struct sieve_binary_block *sblock, uint8_t byte)
{
_sieve_binary_emit_data(sblock, &byte, 1);
}
static inline void _sieve_binary_update_data
(struct sieve_binary_block *sblock, sieve_size_t address, const void *data,
sieve_size_t size)
{
buffer_write(sblock->data, address, data, size);
}
sieve_size_t sieve_binary_emit_data
(struct sieve_binary_block *sblock, const void *data, sieve_size_t size)
{
sieve_size_t address = _sieve_binary_block_get_size(sblock);
_sieve_binary_emit_data(sblock, data, size);
return address;
}
sieve_size_t sieve_binary_emit_byte
(struct sieve_binary_block *sblock, uint8_t byte)
{
sieve_size_t address = _sieve_binary_block_get_size(sblock);
_sieve_binary_emit_data(sblock, &byte, 1);
return address;
}
void sieve_binary_update_data
(struct sieve_binary_block *sblock, sieve_size_t address, const void *data,
sieve_size_t size)
{
_sieve_binary_update_data(sblock, address, data, size);
}
/* Offset emission functions */
sieve_size_t sieve_binary_emit_offset
(struct sieve_binary_block *sblock, sieve_offset_t offset)
{
sieve_size_t address = _sieve_binary_block_get_size(sblock);
uint8_t encoded[sizeof(offset)];
int i;
for ( i = sizeof(offset)-1; i >= 0; i-- ) {
encoded[i] = (uint8_t)offset;
offset >>= 8;
}
_sieve_binary_emit_data(sblock, encoded, sizeof(offset));
return address;
}
void sieve_binary_resolve_offset
(struct sieve_binary_block *sblock, sieve_size_t address)
{
sieve_size_t cur_address = _sieve_binary_block_get_size(sblock);
sieve_offset_t offset;
uint8_t encoded[sizeof(offset)];
int i;
i_assert(cur_address > address);
i_assert((cur_address - address) <= (sieve_offset_t)-1);
offset = cur_address - address;
for ( i = sizeof(offset)-1; i >= 0; i-- ) {
encoded[i] = (uint8_t)offset;
offset >>= 8;
}
_sieve_binary_update_data
(sblock, address, encoded, sizeof(offset));
}
/* Literal emission */
sieve_size_t sieve_binary_emit_integer
(struct sieve_binary_block *sblock, sieve_number_t integer)
{
sieve_size_t address = _sieve_binary_block_get_size(sblock);
uint8_t buffer[sizeof(sieve_number_t) + 1];
int bufpos = sizeof(buffer) - 1;
/* Encode last byte [0xxxxxxx]; msb == 0 marks the last byte */
buffer[bufpos] = integer & 0x7F;
bufpos--;
/* Encode first bytes [1xxxxxxx] */
integer >>= 7;
while ( integer > 0 ) {
buffer[bufpos] = (integer & 0x7F) | 0x80;
bufpos--;
integer >>= 7;
}
/* Emit encoded integer */
bufpos++;
_sieve_binary_emit_data(sblock, buffer + bufpos, sizeof(buffer) - bufpos);
return address;
}
static inline sieve_size_t sieve_binary_emit_dynamic_data
(struct sieve_binary_block *sblock, const void *data, sieve_size_t size)
{
sieve_size_t address = sieve_binary_emit_integer
(sblock, (sieve_number_t) size);
_sieve_binary_emit_data(sblock, data, size);
return address;
}
sieve_size_t sieve_binary_emit_cstring
(struct sieve_binary_block *sblock, const char *str)
{
sieve_size_t address = sieve_binary_emit_dynamic_data
(sblock, (void *) str, (sieve_size_t) strlen(str));
_sieve_binary_emit_byte(sblock, 0);
return address;
}
sieve_size_t sieve_binary_emit_string
(struct sieve_binary_block *sblock, const string_t *str)
{
sieve_size_t address = sieve_binary_emit_dynamic_data
(sblock, (void *) str_data(str), (sieve_size_t) str_len(str));
_sieve_binary_emit_byte(sblock, 0);
return address;
}
/*
* Extension emission
*/
sieve_size_t sieve_binary_emit_extension
(struct sieve_binary_block *sblock, const struct sieve_extension *ext,
unsigned int offset)
{
sieve_size_t address = _sieve_binary_block_get_size(sblock);
struct sieve_binary_extension_reg *ereg = NULL;
(void)sieve_binary_extension_register(sblock->sbin, ext, &ereg);
i_assert(ereg != NULL);
_sieve_binary_emit_byte(sblock, offset + ereg->index);
return address;
}
void sieve_binary_emit_extension_object
(struct sieve_binary_block *sblock, const struct sieve_extension_objects *objs,
unsigned int code)
{
if ( objs->count > 1 )
_sieve_binary_emit_byte(sblock, code);
}
/*
* Code retrieval
*/
#define ADDR_CODE_READ(block) \
size_t _code_size; \
const int8_t *_code = buffer_get_data((block)->data, &_code_size)
#define ADDR_CODE_AT(address) \
((int8_t) (_code[*address]))
#define ADDR_DATA_AT(address) \
((uint8_t) (_code[*address]))
#define ADDR_POINTER(address) \
((const int8_t *) (&_code[*address]))
#define ADDR_BYTES_LEFT(address) \
((*address) > _code_size ? 0 : ((_code_size) - (*address)))
#define ADDR_JUMP(address, offset) \
(*address) += offset
/* Literals */
bool sieve_binary_read_byte
(struct sieve_binary_block *sblock, sieve_size_t *address, unsigned int *byte_r)
{
ADDR_CODE_READ(sblock);
if ( ADDR_BYTES_LEFT(address) >= 1 ) {
if ( byte_r != NULL )
*byte_r = ADDR_DATA_AT(address);
ADDR_JUMP(address, 1);
return TRUE;
}
if ( byte_r != NULL )
*byte_r = 0;
return FALSE;
}
bool sieve_binary_read_code
(struct sieve_binary_block *sblock, sieve_size_t *address, signed int *code_r)
{
ADDR_CODE_READ(sblock);
if ( ADDR_BYTES_LEFT(address) >= 1 ) {
if ( code_r != NULL )
*code_r = ADDR_CODE_AT(address);
ADDR_JUMP(address, 1);
return TRUE;
}
if ( code_r != NULL )
*code_r = 0;
return FALSE;
}
bool sieve_binary_read_offset
(struct sieve_binary_block *sblock, sieve_size_t *address, sieve_offset_t *offset_r)
{
sieve_offset_t offs = 0;
ADDR_CODE_READ(sblock);
if ( ADDR_BYTES_LEFT(address) >= 4 ) {
int i;
for ( i = 0; i < 4; i++ ) {
offs = (offs << 8) + ADDR_DATA_AT(address);
ADDR_JUMP(address, 1);
}
if ( offset_r != NULL )
*offset_r = offs;
return TRUE;
}
return FALSE;
}
/* FIXME: might need negative numbers in the future */
bool sieve_binary_read_integer
(struct sieve_binary_block *sblock, sieve_size_t *address, sieve_number_t *int_r)
{
int bits = sizeof(sieve_number_t) * 8;
sieve_number_t integer = 0;
ADDR_CODE_READ(sblock);
if ( ADDR_BYTES_LEFT(address) == 0 )
return FALSE;
/* Read first integer bytes [1xxxxxxx] */
while ( (ADDR_DATA_AT(address) & 0x80) > 0 ) {
if ( ADDR_BYTES_LEFT(address) > 0 && bits > 0) {
integer |= ADDR_DATA_AT(address) & 0x7F;
ADDR_JUMP(address, 1);
/* Each byte encodes 7 bits of the integer */
integer <<= 7;
bits -= 7;
} else {
/* This is an error */
return FALSE;
}
}
/* Read last byte [0xxxxxxx] */
integer |= ADDR_DATA_AT(address) & 0x7F;
ADDR_JUMP(address, 1);
if ( int_r != NULL )
*int_r = integer;
return TRUE;
}
bool sieve_binary_read_string
(struct sieve_binary_block *sblock, sieve_size_t *address, string_t **str_r)
{
unsigned int strlen = 0;
const char *strdata;
ADDR_CODE_READ(sblock);
if ( !sieve_binary_read_unsigned(sblock, address, &strlen) )
return FALSE;
if ( strlen > ADDR_BYTES_LEFT(address) )
return FALSE;
strdata = (const char *) ADDR_POINTER(address);
ADDR_JUMP(address, strlen);
if ( ADDR_CODE_AT(address) != 0 )
return FALSE;
if ( str_r != NULL )
*str_r = t_str_new_const(strdata, strlen);
ADDR_JUMP(address, 1);
return TRUE;
}
bool sieve_binary_read_extension
(struct sieve_binary_block *sblock, sieve_size_t *address,
unsigned int *offset_r, const struct sieve_extension **ext_r)
{
unsigned int code;
unsigned int offset = *offset_r;
const struct sieve_extension *ext = NULL;
ADDR_CODE_READ(sblock);
if ( ADDR_BYTES_LEFT(address) == 0 )
return FALSE;
(*offset_r) = code = ADDR_DATA_AT(address);
ADDR_JUMP(address, 1);
if ( code >= offset ) {
ext = sieve_binary_extension_get_by_index(sblock->sbin, code - offset);
if ( ext == NULL )
return FALSE;
}
if ( ext_r != NULL )
(*ext_r) = ext;
return TRUE;
}
const void *sieve_binary_read_extension_object
(struct sieve_binary_block *sblock, sieve_size_t *address,
const struct sieve_extension_objects *objs)
{
unsigned int code;
ADDR_CODE_READ(sblock);
if ( objs->count == 0 )
return NULL;
if ( objs->count == 1 )
return objs->objects;
if ( ADDR_BYTES_LEFT(address) == 0 )
return NULL;
code = ADDR_DATA_AT(address);
ADDR_JUMP(address, 1);
if ( code >= objs->count )
return NULL;
return ((const void *const *) objs->objects)[code];
}
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