update

README.md

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+# 文件分离程序
+
+```
+概述:
+    这个程序主要解决一些嵌入式系统没有 split指令，无法对大文件进行分离打包
+
+Usage:
+    zsplit 文件名字
+        @执行完之后会自动将文件分离成100M为单位大小的文件
+    sumcheck
+        @对文件求一个sum8的和，和的结果用u32保存
+
+```
+
+# 编译
+
+```
+export CC=gcc
+./build.sh
+
+```

build.sh

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+#!/bin/bash
+
+CC=/home/zwsd/Desktop/workspace/project_meditation_capsule/HappySwitchSoundBox/toolchain/gcc-linaro-5.4.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-gcc
+
+${CC} sumcheck.c -o sumcheck
+${CC} zsplit.c -o zsplit

sumcheck.c

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+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+
+const char *get_packet_name(const char *filename, int num)
+{
+    static char buf[256] = {0};
+    sprintf(buf, "%s.%d", filename, num);
+    return buf;
+}
+
+int main(int argc, char const *argv[])
+{
+
+    //打开输入文件
+
+    int fd = open(argv[1], O_RDONLY);
+    if (fd < 0)
+    {
+        perror("openfail");
+        exit(-1);
+    }
+
+    int fileindex = 1;
+    uint32_t sumcheck = 0;
+    uint8_t *data = malloc(100 * 1024 * 1024);
+    if (data == NULL)
+    {
+        perror("malloc fail");
+        exit(-1);
+    }
+
+    while (1)
+    {
+
+        int readlen = read(fd, data, 100 * 1024 * 1024);
+        if (readlen <= 0)
+        {
+            printf("write end\n");
+            break;
+        }
+
+        for (size_t i = 0; i < readlen; i++)
+        {
+            sumcheck += data[i];
+        }
+
+    }
+    printf("sumcheck %d\n", sumcheck);
+
+    return 0;
+}

zsplit.c

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+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+
+const char *get_packet_name(const char *filename, int num)
+{
+    static char buf[256] = {0};
+    sprintf(buf, "%s.%d", filename, num);
+    return buf;
+}
+
+int main(int argc, char const *argv[])
+{
+
+    //打开输入文件
+
+    int fd = open(argv[1], O_RDONLY);
+    if (fd < 0)
+    {
+        perror("openfail");
+        exit(-1);
+    }
+
+    int fileindex = 1;
+    uint32_t sumcheck = 0;
+    uint8_t *data = malloc(100 * 1024 * 1024);
+    if (data == NULL)
+    {
+        perror("malloc fail");
+        exit(-1);
+    }
+
+    while (1)
+    {
+
+        int readlen = read(fd, data, 100 * 1024 * 1024);
+        if (readlen <= 0)
+        {
+            printf("write end\n");
+            break;
+        }
+
+        for (size_t i = 0; i < readlen; i++)
+        {
+            sumcheck += data[i];
+        }
+
+        //
+        printf("create %s(%d)\n", get_packet_name(argv[1], fileindex), readlen);
+        int tofd = open(get_packet_name(argv[1], fileindex), O_TRUNC | O_RDWR | O_CREAT,666);
+        int writenum = write(tofd, data, readlen);
+        if (writenum != readlen)
+        {
+            printf("Error: write fail,writenum!=readlen,%d != %d\n", writenum, readlen);
+            exit(0);
+        }
+        close(tofd);
+        fileindex++;
+    }
+    printf("sumcheck %d\n", sumcheck);
+
+    return 0;
+}