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/*
Copyright 2013 bigbiff/Dees_Troy TeamWin
This file is part of TWRP/TeamWin Recovery Project.
TWRP is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
TWRP 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with TWRP. If not, see <http://www.gnu.org/licenses/>.
This is a write buffer for use with libtar. Libtar normally writes
512 bytes at a time but this results in poor file performance
especially on exFAT fuse file systems. This write buffer fixes that
problem.
*/
#include <fcntl.h>
#include "libtar/libtar.h"
#include "twcommon.h"
int flush = 0, eot_count = -1;
unsigned char *write_buffer;
unsigned buffer_size = 4096;
unsigned buffer_loc = 0;
void reinit_libtar_buffer(void) {
flush = 0;
eot_count = -1;
buffer_loc = 0;
}
void init_libtar_buffer(unsigned new_buff_size) {
if (new_buff_size != 0)
buffer_size = new_buff_size;
reinit_libtar_buffer();
write_buffer = (unsigned char*) malloc(sizeof(char *) * buffer_size);
}
void free_libtar_buffer(void) {
free(write_buffer);
}
ssize_t write_libtar_buffer(int fd, const void *buffer, size_t size) {
void* ptr;
if (flush == 0) {
ptr = write_buffer + buffer_loc;
memcpy(ptr, buffer, size);
buffer_loc += size;
if (eot_count >= 0 && eot_count < 2)
eot_count++;
/* At the end of the tar file, libtar will add 2 blank blocks.
Once we have received both EOT blocks, we will immediately
write anything in the buffer to the file.
*/
if (buffer_loc >= buffer_size || eot_count >= 2) {
flush = 1;
}
}
if (flush == 1) {
flush = 0;
if (buffer_loc == 0) {
// nothing to write
return 0;
}
if (write(fd, write_buffer, buffer_loc) != buffer_loc) {
LOGERR("Error writing tar file!\n");
buffer_loc = 0;
return -1;
} else {
buffer_loc = 0;
return size;
}
} else {
return size;
}
// Shouldn't ever get here
return -1;
}
void flush_libtar_buffer(int fd) {
eot_count = 0;
}
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