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/*
* Copyright (c) 2009-2016, Albertas Vyšniauskas
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of the software author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS
* 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 "DynvMemoryIO.h"
#include <string.h>
#include <stdio.h>
struct dynvMemoryIO{
char* buffer;
uint32_t size;
uint32_t eof;
uint32_t position;
};
static int dynv_io_memory_write(struct dynvIO* io, void* data, uint32_t size, uint32_t* data_written) {
struct dynvMemoryIO* mem_io = (struct dynvMemoryIO*) io->userdata;
uint32_t data_left = mem_io->size - mem_io->position;
if (data_left < size){ //buffer too small
uint32_t new_buf = mem_io->size + size + 4096;
//while (new_buf - mem_io->position < size)
// new_buf *= 2;
char *nb;
if ((nb = new char[new_buf])){
if (mem_io->buffer){
memcpy(nb, mem_io->buffer, mem_io->position);
delete[] mem_io->buffer;
}
mem_io->buffer = nb;
mem_io->size = new_buf;
}else{
*data_written = 0;
return 0;
}
}
memcpy(mem_io->buffer + mem_io->position, data, size);
mem_io->position += size;
if (mem_io->position > mem_io->eof)
mem_io->eof = mem_io->position;
*data_written = size;
return 0;
}
static int dynv_io_memory_read(struct dynvIO* io, void* data, uint32_t size, uint32_t* data_read){
struct dynvMemoryIO* mem_io = (struct dynvMemoryIO*) io->userdata;
uint32_t data_left = mem_io->eof - mem_io->position;
if (size > data_left)
size = data_left;
memcpy(data, mem_io->buffer + mem_io->position, size);
mem_io->position += size;
*data_read=size;
return 0;
}
static int dynv_io_memory_seek(struct dynvIO* io, uint32_t offset, int type, uint32_t* position){
struct dynvMemoryIO* mem_io = (struct dynvMemoryIO*) io->userdata;
switch (type){
case SEEK_CUR:
mem_io->position+=offset;
if (mem_io->position>mem_io->eof) mem_io->position=mem_io->eof;
if(position) *position=mem_io->position;
return 0;
break;
case SEEK_SET:
mem_io->position=offset;
if (mem_io->position>mem_io->eof) mem_io->position=mem_io->eof;
if(position) *position=mem_io->position;
return 0;
break;
case SEEK_END:
mem_io->position=mem_io->eof-offset;
if (mem_io->position>mem_io->eof) mem_io->position=mem_io->eof;
if(position) *position=mem_io->position;
return 0;
break;
}
return -1;
}
static int dynv_io_memory_free(struct dynvIO* io){
struct dynvMemoryIO* mem_io=(struct dynvMemoryIO*)io->userdata;
if (mem_io->buffer) delete [] mem_io->buffer;
delete mem_io;
return 0;
}
static int dynv_io_memory_reset(struct dynvIO* io){
struct dynvMemoryIO* mem_io=(struct dynvMemoryIO*)io->userdata;
mem_io->eof=0;
mem_io->position=0;
return 0;
}
struct dynvIO* dynv_io_memory_new(){
struct dynvIO* io=new struct dynvIO;
struct dynvMemoryIO* mem_io=new struct dynvMemoryIO;
mem_io->buffer=0;
mem_io->eof=0;
mem_io->position=0;
mem_io->size=0;
io->userdata=mem_io;
io->write=dynv_io_memory_write;
io->read=dynv_io_memory_read;
io->seek=dynv_io_memory_seek;
io->free=dynv_io_memory_free;
io->reset=dynv_io_memory_reset;
return io;
}
int dynv_io_memory_get_data(struct dynvIO* io, char** data, uint32_t* size){
struct dynvMemoryIO* mem_io=(struct dynvMemoryIO*)io->userdata;
if (!mem_io) return -1;
if (!mem_io->buffer) return -1;
*data=mem_io->buffer;
*size=mem_io->eof;
return 0;
}
int dynv_io_memory_set_data(struct dynvIO* io, char* data, uint32_t size){
struct dynvMemoryIO* mem_io=(struct dynvMemoryIO*)io->userdata;
if (!mem_io) return -1;
dynv_io_memory_reset(io);
uint32_t written;
dynv_io_memory_write(io, data, size, &written);
return 0;
}
int dynv_io_memory_prepare_size(struct dynvIO* io, uint32_t size){
struct dynvMemoryIO* mem_io=(struct dynvMemoryIO*)io->userdata;
if (!mem_io) return -1;
mem_io->eof=size;
mem_io->position=0;
if (mem_io->size<size){
char *nb;
if ((nb = new char[size])){
//memcpy(nb, mem_io->buffer, mem_io->position);
if (mem_io->buffer) delete[] mem_io->buffer;
mem_io->buffer = nb;
mem_io->size = size;
return 0;
}else{
return -1;
}
}
return 0;
}
void* dynv_io_memory_get_buffer(struct dynvIO* io){
struct dynvMemoryIO* mem_io=(struct dynvMemoryIO*)io->userdata;
if (!mem_io) return 0;
return mem_io->buffer;
}
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