76 lines
1.5 KiB
C++
76 lines
1.5 KiB
C++
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#include "pxt.h"
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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namespace pxt {
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PXT_VTABLE_CTOR(MMap) {
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length = 0;
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fd = -1;
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data = 0;
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}
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void MMap::print() {
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DMESG("MMap %p r=%d len=%d fd=%d data=%p", this, refcnt, length, fd, data);
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}
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void MMap::destroy() {
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munmap(data, length);
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close(fd);
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}
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}
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namespace control {
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/** Create new file mapping in memory */
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//%
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MMap *mmap(String filename, int size, int offset) {
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int fd = open(filename->data, O_RDWR, 0);
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if (fd < 0)
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return 0;
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void *data = ::mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset);
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if (data == MAP_FAILED) {
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close(fd);
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return 0;
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}
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auto r = new MMap();
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r->fd = fd;
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r->length = size;
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r->data = (uint8_t*)data;
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return r;
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}
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}
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namespace MMapMethods {
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/**
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* Write a number in specified format in the buffer.
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*/
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//%
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void setNumber(MMap *buf, NumberFormat format, int offset, TNumber value) {
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if (offset < 0)
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return;
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setNumberCore(buf->data + offset, buf->length - offset, format, value);
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}
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/**
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* Read a number in specified format from the buffer.
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*/
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//%
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TNumber getNumber(MMap *buf, NumberFormat format, int offset) {
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if (offset < 0)
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return fromInt(0);
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return getNumberCore(buf->data + offset, buf->length - offset, format);
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}
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/** Returns the length of a Buffer object. */
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//% property
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int length(MMap *s) {
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return s->length;
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}
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}
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