blob: 3bfcc82c17ed10cb331ddfb46f0ea98b160b57ca [file] [log] [blame]
/*
zip_buffer.c -- bounds checked access to memory buffer
Copyright (C) 2014-2020 Dieter Baron and Thomas Klausner
This file is part of libzip, a library to manipulate ZIP archives.
The authors can be contacted at <libzip@nih.at>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. 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.
3. The names of the authors may not be used to endorse or promote
products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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 <stdlib.h>
#include <string.h>
#include "zipint.h"
zip_uint8_t *
_zip_buffer_data(zip_buffer_t *buffer) {
return buffer->data;
}
void
_zip_buffer_free(zip_buffer_t *buffer) {
if (buffer == NULL) {
return;
}
if (buffer->free_data) {
free(buffer->data);
}
free(buffer);
}
bool
_zip_buffer_eof(zip_buffer_t *buffer) {
return buffer->ok && buffer->offset == buffer->size;
}
zip_uint8_t *
_zip_buffer_get(zip_buffer_t *buffer, zip_uint64_t length) {
zip_uint8_t *data;
data = _zip_buffer_peek(buffer, length);
if (data != NULL) {
buffer->offset += length;
}
return data;
}
zip_uint16_t
_zip_buffer_get_16(zip_buffer_t *buffer) {
zip_uint8_t *data = _zip_buffer_get(buffer, 2);
if (data == NULL) {
return 0;
}
return (zip_uint16_t)(data[0] + (data[1] << 8));
}
zip_uint32_t
_zip_buffer_get_32(zip_buffer_t *buffer) {
zip_uint8_t *data = _zip_buffer_get(buffer, 4);
if (data == NULL) {
return 0;
}
return ((((((zip_uint32_t)data[3] << 8) + data[2]) << 8) + data[1]) << 8) + data[0];
}
zip_uint64_t
_zip_buffer_get_64(zip_buffer_t *buffer) {
zip_uint8_t *data = _zip_buffer_get(buffer, 8);
if (data == NULL) {
return 0;
}
return ((zip_uint64_t)data[7] << 56) + ((zip_uint64_t)data[6] << 48) + ((zip_uint64_t)data[5] << 40) + ((zip_uint64_t)data[4] << 32) + ((zip_uint64_t)data[3] << 24) + ((zip_uint64_t)data[2] << 16) + ((zip_uint64_t)data[1] << 8) + (zip_uint64_t)data[0];
}
zip_uint8_t
_zip_buffer_get_8(zip_buffer_t *buffer) {
zip_uint8_t *data = _zip_buffer_get(buffer, 1);
if (data == NULL) {
return 0;
}
return data[0];
}
zip_uint64_t
_zip_buffer_left(zip_buffer_t *buffer) {
return buffer->ok ? buffer->size - buffer->offset : 0;
}
zip_uint64_t
_zip_buffer_read(zip_buffer_t *buffer, zip_uint8_t *data, zip_uint64_t length) {
if (_zip_buffer_left(buffer) < length) {
length = _zip_buffer_left(buffer);
}
memcpy(data, _zip_buffer_get(buffer, length), length);
return length;
}
zip_buffer_t *
_zip_buffer_new(zip_uint8_t *data, zip_uint64_t size) {
bool free_data = (data == NULL);
zip_buffer_t *buffer;
if (data == NULL) {
if ((data = (zip_uint8_t *)malloc(size)) == NULL) {
return NULL;
}
}
if ((buffer = (zip_buffer_t *)malloc(sizeof(*buffer))) == NULL) {
if (free_data) {
free(data);
}
return NULL;
}
buffer->ok = true;
buffer->data = data;
buffer->size = size;
buffer->offset = 0;
buffer->free_data = free_data;
return buffer;
}
zip_buffer_t *
_zip_buffer_new_from_source(zip_source_t *src, zip_uint64_t size, zip_uint8_t *buf, zip_error_t *error) {
zip_buffer_t *buffer;
if ((buffer = _zip_buffer_new(buf, size)) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
return NULL;
}
if (_zip_read(src, buffer->data, size, error) < 0) {
_zip_buffer_free(buffer);
return NULL;
}
return buffer;
}
zip_uint64_t
_zip_buffer_offset(zip_buffer_t *buffer) {
return buffer->ok ? buffer->offset : 0;
}
bool
_zip_buffer_ok(zip_buffer_t *buffer) {
return buffer->ok;
}
zip_uint8_t *
_zip_buffer_peek(zip_buffer_t *buffer, zip_uint64_t length) {
zip_uint8_t *data;
if (!buffer->ok || buffer->offset + length < length || buffer->offset + length > buffer->size) {
buffer->ok = false;
return NULL;
}
data = buffer->data + buffer->offset;
return data;
}
int
_zip_buffer_put(zip_buffer_t *buffer, const void *src, size_t length) {
zip_uint8_t *dst = _zip_buffer_get(buffer, length);
if (dst == NULL) {
return -1;
}
memcpy(dst, src, length);
return 0;
}
int
_zip_buffer_put_16(zip_buffer_t *buffer, zip_uint16_t i) {
zip_uint8_t *data = _zip_buffer_get(buffer, 2);
if (data == NULL) {
return -1;
}
data[0] = (zip_uint8_t)(i & 0xff);
data[1] = (zip_uint8_t)((i >> 8) & 0xff);
return 0;
}
int
_zip_buffer_put_32(zip_buffer_t *buffer, zip_uint32_t i) {
zip_uint8_t *data = _zip_buffer_get(buffer, 4);
if (data == NULL) {
return -1;
}
data[0] = (zip_uint8_t)(i & 0xff);
data[1] = (zip_uint8_t)((i >> 8) & 0xff);
data[2] = (zip_uint8_t)((i >> 16) & 0xff);
data[3] = (zip_uint8_t)((i >> 24) & 0xff);
return 0;
}
int
_zip_buffer_put_64(zip_buffer_t *buffer, zip_uint64_t i) {
zip_uint8_t *data = _zip_buffer_get(buffer, 8);
if (data == NULL) {
return -1;
}
data[0] = (zip_uint8_t)(i & 0xff);
data[1] = (zip_uint8_t)((i >> 8) & 0xff);
data[2] = (zip_uint8_t)((i >> 16) & 0xff);
data[3] = (zip_uint8_t)((i >> 24) & 0xff);
data[4] = (zip_uint8_t)((i >> 32) & 0xff);
data[5] = (zip_uint8_t)((i >> 40) & 0xff);
data[6] = (zip_uint8_t)((i >> 48) & 0xff);
data[7] = (zip_uint8_t)((i >> 56) & 0xff);
return 0;
}
int
_zip_buffer_put_8(zip_buffer_t *buffer, zip_uint8_t i) {
zip_uint8_t *data = _zip_buffer_get(buffer, 1);
if (data == NULL) {
return -1;
}
data[0] = i;
return 0;
}
int
_zip_buffer_set_offset(zip_buffer_t *buffer, zip_uint64_t offset) {
if (offset > buffer->size) {
buffer->ok = false;
return -1;
}
buffer->ok = true;
buffer->offset = offset;
return 0;
}
int
_zip_buffer_skip(zip_buffer_t *buffer, zip_uint64_t length) {
zip_uint64_t offset = buffer->offset + length;
if (offset < buffer->offset) {
buffer->ok = false;
return -1;
}
return _zip_buffer_set_offset(buffer, offset);
}
zip_uint64_t
_zip_buffer_size(zip_buffer_t *buffer) {
return buffer->size;
}