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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __FEC_H__
#define __FEC_H__
#include <utils/Compat.h>
#include <string>
#include <vector>
#include <fec/io.h>
#include <fec/ecc.h>
#define IMAGE_MIN_THREADS 1
#define IMAGE_MAX_THREADS 128
#define INFO(x...) \
fprintf(stderr, x);
#define FATAL(x...) { \
fprintf(stderr, x); \
exit(1); \
}
#define unlikely(x) __builtin_expect(!!(x), 0)
struct image {
/* if true, decode file in place instead of creating a new output file */
bool inplace;
/* if true, assume input is a sparse file */
bool sparse;
/* if true, print more verbose information to stderr */
bool verbose;
const char *fec_filename;
int fec_fd;
int inp_fd;
/* the number of Reed-Solomon generator polynomial roots, also the number
of parity bytes generated for each N bytes in RS(M, N) */
int roots;
/* for RS(M, N), N = M - roots */
int rs_n;
int threads;
uint32_t fec_size;
uint32_t padding;
uint64_t blocks;
uint64_t inp_size;
uint64_t pos;
uint64_t rounds;
uint64_t rv;
uint8_t *fec;
uint8_t *input;
uint8_t *output;
};
struct image_proc_ctx;
typedef void (*image_proc_func)(image_proc_ctx *);
struct image_proc_ctx {
image_proc_func func;
int id;
image *ctx;
uint64_t rv;
uint64_t fec_pos;
uint64_t start;
uint64_t end;
void *rs;
};
extern bool image_load(const std::vector<std::string>& filename, image *ctx);
extern bool image_save(const std::string& filename, image *ctx);
extern bool image_ecc_new(const std::string& filename, image *ctx);
extern bool image_ecc_load(const std::string& filename, image *ctx);
extern bool image_ecc_save(image *ctx);
extern bool image_process(image_proc_func f, image *ctx);
extern void image_init(image *ctx);
extern void image_free(image *ctx);
inline uint8_t image_get_interleaved_byte(uint64_t i, image *ctx)
{
uint64_t offset = fec_ecc_interleave(i, ctx->rs_n, ctx->rounds);
if (unlikely(offset >= ctx->inp_size)) {
return 0;
}
return ctx->input[offset];
}
inline void image_set_interleaved_byte(uint64_t i, image *ctx,
uint8_t value)
{
uint64_t offset = fec_ecc_interleave(i, ctx->rs_n, ctx->rounds);
if (unlikely(offset >= ctx->inp_size)) {
assert(value == 0);
} else if (ctx->output && ctx->output[offset] != value) {
ctx->output[offset] = value;
}
}
#endif // __FEC_H__
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