通过memcpy从unsigned char* buffer获取long - 腾讯云开发者社区

文章/答案/技术大牛

发布

详解全志R128 RTOS异构多核通信原理

ssize_t ret = -1; hal_dcache_invalidate((unsigned long)buffer, size); ret = write(fd, buffer,...= (void *)(unsigned long)fd; args[1] = buffer; args[2] = (void *)(unsigned long)size; if...((unsigned long)buffer, size); return ret; } MAYBE_STATIC ssize_t write(int fd, void *buffer, size_t...} static int data_check(void *buffer, uint32_t len) { unsigned char res[16]; int data_len = len -...rpd_send) return -1; buffer = rpdata_buffer_addr(rpd_send); memcpy(buffer, data, data_len); ret

1K1 0

SkeyeRTSPLive高效转码之SkeyeVideoEncoder高效硬件编码解决方案（附源码)（2）

int GetSPSAndPPS(unsigned char*sps,long&spslen,unsigned char*pps,long&ppslen); //H265获取VPS,SPS和PPS...int GetH265VPSSPSAndPPS(unsigned char*vps, long&vpslen, unsigned char*sps, long&spslen, unsigned char...如果编码格式为H264，我们通过GetSPSAndPPS获取编码信息头SPS和PPS，如下代码段所示： //获取SPS和PPS int GetSPSAndPPS(unsigned char*sps,...long&spslen,unsigned char*pps,long&ppslen) { if (!...(unsigned char*vps, long&vpslen, unsigned char*sps, long&spslen, unsigned char*pps, long&ppslen) {

7181 0

您找到你想要的搜索结果了吗？

是的

没有找到

linux内核数据结构之kfifo

int kfifo_put(struct kfifo *fifo, const unsigned char *buffer, unsigned int len) //从...int len) //获取kfifo中有数据的buffer大小 unsigned int kfifo_len(struct kfifo *fifo) 定义自旋锁的目的为了防止多进程/线程并发使用kfifo...char *buffer, unsigned int len) { unsigned long flags; unsigned int ret; spin_lock_irqsave...unsigned char *buffer, unsigned int len) { unsigned long flags; unsigned int ret; spin_lock_irqsave...从代码中可以看出put和get都调用两次memcpy，这针对的是边界条件。例如下图：蓝色表示空闲，红色表示占用。（1）空的kfifo， ? （2）put一个buffer后 ?

3.2K1 0

【C 语言】文件操作 ( 文件加密解密 | 解密文件 )

feof(fp_in)) { // 尝试从输入文件中读取 4K 数据 input_len = fread(input_buffer, 1, 4096, fp_in...feof(fp_in)) { // 尝试从输入文件中读取 4K 数据 input_len = fread(input_buffer, 1, 4096, fp_in...feof(fp_in)) { // 尝试从输入文件中读取 4K 数据 input_len = fread(input_buffer, 1, 4096, fp_in...( unsigned char *pbDesKey, unsigned long ulDesKeyLen, unsigned char *pbDesDecKey, unsigned long...long OPENCOMM_DesExpandEncKey( unsigned char *pbDesKey, unsigned long ulDesKeyLen, unsigned char

10.1K3 1

UPnP端口映射实现过程(二)

long UPNPADDR = 0xFAFFFFEF;//250_255_255_239 const unsigned short UPNPPORT = 1900; static const char...long nIP [IN]: * 返回值: XOS_BOOL * 备注: */ XOS_BOOL ISLANIP(unsigned long nIP) { // filter LAN...); } /* 功能描述: 从字符串中取出第一句语句 (\r\n分割的第一个语句) * 参数说明: * const char *strSrc [IN]:要处理的源信息 *...char *request, char *response) { char buffer[10240]; int length = strlen(request); u_long lv = 1;...long uReqIp = 0; unsigned long uDefGW = 0; // int iSleepTime = 1000;// 1s // XOS_SOCKET s; u_long

9612 0

使用MFC编写字节转码工具，支持数值与字节码的相互转换

,int, unsigned int,long long,unsigned long long,float,double等数值)的4种表示方式：Big-endian(大端)、Little-endian(...因此，大小字节序系统之间的数据交换（包括转换为网络字节序字节顺序）通常需要通过字节交换数据来实现字节序转换。这仅适用于二进制数据值，不适用于文本字符串。...char uint8; typedef unsigned short uint16; typedef unsigned int uint32; #ifdef WIN32 typedef unsigned...__int64 uint64; typedef __int64 int64; #else typedef unsigned long long uint64; typedef long long int64...+ startPos, buffer + endPos, std::back_inserter(tmp8)); } memcpy(tmp16.data(), tmp8.data(), byteNum

2.7K3 1

运用Capstone实现64位进程钩子扫描

long long address;// 相对地址unsigned char opCode[16]; // 机器码char opString[256]; // 反汇编}DisassemblyInfo...long fileSize = ftell(file);fseek(file, 0, SEEK_SET);// 开辟指定大小的内存LPVOID buffer = malloc(sizeof(char)...= CS_ERR_OK){return{};}// 反汇编代码,地址从0x0开始,返回总条数count = cs_disasm(handle, (unsigned char *)startOffset,...int main(int argc, char *argv[]){DWORD64 fileSize = 0;LPVOID fileBuffer = NULL;// 从完整路径中获取文件名CHAR fullPath...char *fileTextBuffer = NULL;fileTextBuffer = (unsigned char *)malloc((textInfo.size));memcpy(fileTextBuffer

6372 0

驱动开发：通过PIPE管道与内核层通信

memcpy(buffer, buffer_tmp, size); printf("内核层数据: %s \n", buffer); free(buffer_tmp); free...long address; unsigned long buffer_data_len; char buffer_data[0]; }Networkreport; VOID NdisMSleep...= 13; // 定位到结构体最后一个元素上 unsigned char * tmp = (unsigned char *)report + sizeof(Networkreport...long address; unsigned long buffer_data_len; char *buffer_data; }Networkreport; int main(int argc...(buffer->buffer_data_len); unsigned char* tmp = (unsigned char *)buffer + sizeof(Networkreport) -

8954 0

驱动通信：通过PIPE管道与内核层通信

7363 1

【C 语言】文件操作 ( 文件加密解密 | 加密文件 )

feof(fp_in)) { // 尝试从输入文件中读取 4K 数据 input_len = fread(input_buffer, 1, 4096, fp_in...input_buffer[4096] = {0}; // 输入数据字节数 int input_len = 0; // 输出文件缓冲区 unsigned char output_buffer...feof(fp_in)) { // 尝试从输入文件中读取 4K 数据 input_len = fread(input_buffer, 1, 4096, fp_in...( unsigned char *pbDesKey, unsigned long ulDesKeyLen, unsigned char *pbDesDecKey, unsigned long...long OPENCOMM_DesExpandEncKey( unsigned char *pbDesKey, unsigned long ulDesKeyLen, unsigned char

10.9K3 1

驱动开发：通过PIPE管道与内核层通信

* buffer_tmp = (char*)&buf;// 拷贝前半部分,不包括 buffer_datachar* buffer = (char*)malloc(size);memcpy(buffer,...long address; unsigned long buffer_data_len; char buffer_data[0];}Networkreport;VOID NdisMSleep(IN...long address;unsigned long buffer_data_len;char *buffer_data;}Networkreport;int main(int argc, char...buffer_len);// 对后半部分配空间// By: LySharkchar* data = (char*)malloc(buffer->buffer_data_len);unsigned char...* tmp = (unsigned char *)buffer + sizeof(Networkreport) - 4;memcpy(data, tmp, buffer->buffer_data_len

6952 0

ringbuffer是什么_drum buffer rope

of the buffer */ if (size - len > 0) { memcpy(ring_buf_p->buffer, (char *)buffer + len, size...) from the beginning of the buffer */ if (size - len > 0) { memcpy((char *)buffer + len, ring_buf_p...->buffer, size - len); } ring_buf_p->out += size; return size; } 获取队列中可读数据的大小此代码由Java架构师必看网-架构君整理...在CAN卡驱动程序中采用如下所示的称为“Block_Ring_t”的数据结构作为收发数据的缓冲区： typedef struct { long signature; unsigned char *head_p...; unsigned char *tail_p; unsigned char *begin_p; unsigned char *end_p; unsigned char buffer [512]; int

1.4K2 0

websocket和http的瓜葛以及websocket协议实现「建议收藏」

(hdr.mask_key, mask, 4); memcpy(buffer, &head, sizeof(nty_ophdr)); memcpy(buffer+sizeof(nty_ophdr...(hdr.mask_key, mask, 4); memcpy(buffer, &head, sizeof(nty_ophdr)); memcpy(buffer+sizeof(nty_ophdr...)); struct _nty_websocket_head_127 { unsigned long long payload_length; char mask_key[4]; unsigned char...(hdr.mask_key, mask, 4); memcpy(buffer, &head, sizeof(nty_ophdr)); memcpy(buffer+sizeof(nty_ophdr), &...(hdr.mask_key, mask, 4); memcpy(buffer, &head, sizeof(nty_ophdr)); memcpy(buffer+sizeof(nty_ophdr), &

7891 0

ringbuffer是什么_Buffer

buffer */ if (size - len > 0) { memcpy(ring_buf_p->buffer, (char *)buffer + len, size - len...) from the beginning of the buffer */ if (size - len > 0) { memcpy((char *)buffer + len, ring_buf_p...->buffer, size - len); } ring_buf_p->out += size; return size; } 获取队列中可读数据的大小 unsigned int RingBufferLen...在CAN卡驱动程序中采用如下所示的称为“Block_Ring_t”的数据结构作为收发数据的缓冲区： typedef struct { long signature; unsigned char *head_p...; unsigned char *tail_p; unsigned char *begin_p; unsigned char *end_p; unsigned char buffer [512]; int

2.3K4 0

Openssl Heartbleed

int dtls1_process_heartbeat(SSL *s) { unsigned char *p = &s->s3->rrec.data...'buf' */ unsigned char *data; /* pointer to the record data */ unsigned char *input...- malloc()ed */ unsigned long epoch; /* epoch number, needed by DTLS1 */ unsigned...unsigned char *buffer, *bp; int r; /* Allocate memory for the response, size is 1 byte * message type...然后程序从pl处开始复制payload个字节到新分配的bp数组中——pl指向了用户提供的心跳包数据。最后，程序将所有数据发回给用户。

1K2 0

通过源码理解rarp协议（基于linux1.2.13）

long ip; /* ip address of entry */ unsigned char ha[MAX_ADDR_LEN...char *rarp_ptr = (unsigned char *)(rarp+1); struct rarp_table *entry; long sip,tip; unsigned...void arp_send(int type, int ptype, unsigned long dest_ip, struct device *dev, unsigned long...src_ip, unsigned char *dest_hw, unsigned char *src_hw) { struct sk_buff *skb; struct...char *)(arp+1); memcpy(arp_ptr, src_hw, dev->addr_len); arp_ptr+=dev->addr_len; memcpy(arp_ptr

7542 0

libmad学习进阶4 -----基于atlas音频驱动架构的MP3播放器

int Uninit_dsp(); static int decode(unsigned char const *, unsigned long); static enum mad_flow...unsigned char const *start; unsigned long length; }; int id; int flag=0; snd_pcm_t *handle...int i=0; char buf[1]; static char buffer[1024*2*2]; /* pcm->samplerate contains the sampling...(*right_ch++); buf[0]=(sample >> 0) & 0xff; memcpy(buffer+i,buf,1); i++;...char const *start, unsigned long length) { struct buffer buffer; struct mad_decoder decoder

1.1K2 0

C++屏幕截图图片转JPEG

long bfOffBits; }; struct bmp_infoheader //文件信息头，长度为40Byte固定 { unsigned long biSize; unsigned long...biWidth; unsigned long biHeight; unsigned short biPlanes; unsigned short biBitCount; unsigned long...biCompression; unsigned long biSizeImage; unsigned long biXPelsPerMeter; unsigned long biYPelsPerMeter...; unsigned long biClrUsed; unsigned long biClrImportant; }; struct RGBPallete { unsigned char b;...* bmp, const char* jpeg) { unsigned char* brga = nullptr; //指向位图buffer的全局指针，window下像素格式: BGRA(4个字节)

3K1 0

字节数组和short,int,float,double等类型的相互转换

一、在C++中从字节数组中获取short,int,long,float,double等数据在进行Modbus协议通信和网络编程时，有时需要将从串口或者网络中接收的数据从字节数组转换成对应的int，float...,double等数据，有时还要考虑大小端字节序以及Swap的问题，发现在C++中需要自己写相关的转换函数，于是/写了一个函数，用于从输入的byte数组中获取指定类型的数据，目前支持int16,int32...char uint8; typedef unsigned short uint16; typedef unsigned int uint32; #ifdef WIN32 typedef unsigned...__int64 uint64; typedef __int64 int64; #else typedef unsigned long long uint64; typedef long long int64...另外，C#中直接提供了byte数据类型，类似于C和C++中的unsigned char 数据类型方法 bool ToBoolean(Byte[], Int32) char ToChar(Byte[],

6.5K1 0

c++ 日志类线程安全+缓存

最后在析构函数中，通过LogBoss的静态公开的方法，获取LogBoss指针，然后将临时变量的缓存加入到总缓存。...; void append(const char* data, int len); 　　 //获取智能指针 static shared_ptr getInstance...& operatorlong); LogStream& operatorunsigned long); LogStream& operatorlong...long); LogStream& operatorunsigned long long); LogStream& operator<<(const void*)...; } LogStream& LogStream::operatorunsigned long long v) { formatInteger(v); return *this;

1.5K2 1

点击加载更多

详解全志R128 RTOS异构多核通信原理

SkeyeRTSPLive高效转码之SkeyeVideoEncoder高效硬件编码解决方案（附源码)（2）

linux内核数据结构之kfifo

【C 语言】文件操作 ( 文件加密解密 | 解密文件 )

UPnP端口映射实现过程(二)

使用MFC编写字节转码工具，支持数值与字节码的相互转换

运用Capstone实现64位进程钩子扫描

驱动开发：通过PIPE管道与内核层通信

驱动通信：通过PIPE管道与内核层通信

【C 语言】文件操作 ( 文件加密解密 | 加密文件 )

驱动开发：通过PIPE管道与内核层通信

ringbuffer是什么_drum buffer rope

websocket和http的瓜葛以及websocket协议实现「建议收藏」

ringbuffer是什么_Buffer

Openssl Heartbleed

通过源码理解rarp协议（基于linux1.2.13）

libmad学习进阶4 -----基于atlas音频驱动架构的MP3播放器

C++屏幕截图图片转JPEG

字节数组和short,int,float,double等类型的相互转换

c++ 日志类线程安全+缓存

相关资讯

热门标签

活动推荐

运营活动

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐