ipc_frame.cpp

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#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "ipc_frame.h"
 
namespace{
int32_t read_int(const char *buf){
        int32_t result = 0;
        auto char_ptr = reinterpret_cast<char *>(&result);
 
        char_ptr[0] = buf[0];
        char_ptr[1] = buf[1];
        char_ptr[2] = buf[2];
        char_ptr[3] = buf[3];
 
        return result;
}
 
void write_int(char *dst, uint32_t val){
        auto src = reinterpret_cast<char *>(&val);
        dst[0] = src[0];
        dst[1] = src[1];
        dst[2] = src[2];
        dst[3] = src[3];
}
 
} //anon namespace
 
 
bool ipc_frame_parse_header(Ipc_frame_header *hdr, const char *buf){
        hdr->width = read_int(buf + 0);
        hdr->height = read_int(buf + 4);
        hdr->data_len = read_int(buf + 8);
        hdr->color_spec = static_cast<Ipc_frame_color_spec>(read_int(buf + 12));
 
        return true;
}
 
void ipc_frame_write_header(const struct Ipc_frame_header *hdr, char *dst){
        memset(dst, 0, IPC_FRAME_HEADER_LEN);
        write_int(dst + 0, hdr->width);
        write_int(dst + 4, hdr->height);
        write_int(dst + 8, hdr->data_len);
        write_int(dst + 12, hdr->color_spec);
}
 
Ipc_frame *ipc_frame_new(){
        auto frame = static_cast<Ipc_frame *>(malloc(sizeof(Ipc_frame)));
        frame->header.width = 0;
        frame->header.height = 0;
        frame->header.data_len = 0;
        frame->header.color_spec = IPC_FRAME_COLOR_NONE;
 
        frame->data = nullptr;
        frame->alloc_size = 0;
 
        return frame;
}
 
void ipc_frame_free(Ipc_frame *frame){
        free(frame->data);
        free(frame);
}
 
bool ipc_frame_reserve(Ipc_frame *frame, size_t size){
        if(size <= frame->alloc_size)
                return true;
 
        auto newbuf = static_cast<char *>(realloc(frame->data, size));
        if(!newbuf)
                return false;
        frame->data = newbuf;
        frame->alloc_size = size;
 
        return true;
}