写一个c代码将jpg图片文件压缩成base64数据
时间: 2024-03-15 22:46:40 浏览: 12
以下是一个将jpg图片文件压缩成base64数据的C代码示例:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/bio.h>
#include <openssl/evp.h>
#include <openssl/buffer.h>
#define BUF_SIZE 1024
int main(int argc, char *argv[]) {
if (argc < 2) {
printf("Usage: %s <jpg_filename>\n", argv[0]);
return 1;
}
FILE *fp = fopen(argv[1], "rb");
if (fp == NULL) {
printf("Failed to open file: %s\n", argv[1]);
return 1;
}
// 读取jpg文件内容
fseek(fp, 0, SEEK_END);
long size = ftell(fp);
fseek(fp, 0, SEEK_SET);
unsigned char *jpg_data = (unsigned char *) malloc(size);
fread(jpg_data, 1, size, fp);
fclose(fp);
// 将jpg数据压缩成base64格式
BIO *bio = BIO_new(BIO_s_mem());
BIO *b64 = BIO_new(BIO_f_base64());
bio = BIO_push(b64, bio);
BIO_write(bio, jpg_data, size);
BIO_flush(bio);
// 读取压缩后的数据
BUF_MEM *bufferPtr;
BIO_get_mem_ptr(bio, &bufferPtr);
char *base64_data = (char *) malloc(bufferPtr->length + 1);
memcpy(base64_data, bufferPtr->data, bufferPtr->length);
base64_data[bufferPtr->length] = '\0';
// 打印压缩后的数据
printf("%s\n", base64_data);
// 释放内存
free(jpg_data);
free(base64_data);
BIO_free_all(bio);
return 0;
}
```
注意:该示例使用了OpenSSL库进行base64编码,因此需要在编译时链接OpenSSL库,例如:
```
gcc -o compress_jpg compress_jpg.c -lssl -lcrypto
```