fumiama/base16384
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新的设计，速度快很多

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fumiama
2021-04-08 15:34:32 +08:00
parent 2785b6e766
commit 963abc1ec3
13 changed files with 355 additions and 305 deletions
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105
base16384.c Normal file
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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "base16384.h"
void encode_file(const char* input, const char* output) {
FILE* fp = NULL;
fp = fopen(input, "rb");
if(fp) {
FILE* fpo = NULL;
fpo = fopen(output, "wb");
if(fpo) {
char* bufi = (char*)malloc(B14BUFSIZ/7*7);
if(bufi) {
int cnt = 0;
fputc(0xFE, fpo);
fputc(0xFF, fpo);
fflush(fpo);
while((cnt = fread(bufi, sizeof(char), B14BUFSIZ/7*7, fp))) {
LENDAT* ld = encode(bufi, cnt);
if(fwrite(ld->data, ld->len, 1, fpo) <= 0) {
puts("Write file error!");
exit(EXIT_FAILURE);
}
free(ld);
}
free(bufi);
} else puts("Allocate input buffer error!");
fclose(fpo);
} else puts("Open output file error!");
fclose(fp);
} else puts("Open input file error!");
}
int rm_head(FILE* fp) {
int ch = fgetc(fp);
if(ch == 0xFE) fgetc(fp);
else rewind(fp);
}
static int is_next_end(FILE* fp) {
int ch = fgetc(fp);
if(ch == '=') return fgetc(fp);
else {
ungetc(ch, fp);
return 0;
}
}
void decode_file(const char* input, const char* output) {
FILE* fp = NULL;
fp = fopen(input, "rb");
if(fp) {
FILE* fpo = NULL;
fpo = fopen(output, "wb");
if(fpo) {
char* bufi = (char*)malloc(B14BUFSIZ/8*8 + 2); //+2避免漏检结束偏移标志
if(bufi) {
int cnt = 0;
int end = 0;
rm_head(fp);
while((cnt = fread(bufi, sizeof(char), B14BUFSIZ/8*8, fp))) {
if((end = is_next_end(fp))) {
bufi[cnt++] = '=';
bufi[cnt++] = end;
}
LENDAT* ld = decode(bufi, cnt);
if(fwrite(ld->data, ld->len, 1, fpo) <= 0) {
puts("Write file error!");
exit(EXIT_FAILURE);
}
free(ld);
}
free(bufi);
} else puts("Allocate input buffer error!");
fclose(fpo);
} else puts("Open output file error!");
fclose(fp);
} else puts("Open input file error!");
}
unsigned long get_start_ms() {
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return (ts.tv_sec * 1000 + ts.tv_nsec / 1000000);
}
#define CHOICE argv[1][1]
int main(int argc, char** argv) {
if(argc == 4) {
unsigned long t = get_start_ms();
switch(CHOICE){
case 'e': encode_file(argv[2], argv[3]); break;
case 'd': decode_file(argv[2], argv[3]); break;
default: break;
}
printf("spend time: %lums\n", get_start_ms() - t);
} else {
fputs("Usage: -[e|d] <inputfile> <outputfile>\n", stderr);
fputs("\t-e encode\n", stderr);
fputs("\t-d decode\n", stderr);
exit(EXIT_FAILURE);
}
return 0;
}