mrf::XilinxBitInfo Struct Reference

Attempt to read out the header of a Xilinx bitstream file. More...

#include <flash.h>

Public Member Functions
	XilinxBitInfo ()
bool	read (std::istream &strm)

Public Attributes
std::string	project
std::string	part
std::string	date

Detailed Description

Attempt to read out the header of a Xilinx bitstream file.

Definition at line 104 of file flash.h.

Constructor & Destructor Documentation

XilinxBitInfo()

mrf::XilinxBitInfo::XilinxBitInfo ( )

inline

Definition at line 106 of file flash.h.

{}

Member Function Documentation

read()

bool mrf::XilinxBitInfo::read

(

std::istream &

strm

)

Definition at line 405 of file flash.cpp.

{
    static const char header[] = "\0\x09\x0f\xf0\x0f\xf0\x0f\xf0\x0f\xf0\0\0\1";

    std::vector<char> buf(sizeof(header)-1);

    if(strm.read(&buf[0], buf.size()).gcount()!=std::streamsize(buf.size()) || !std::equal(buf.begin(), buf.end(), header))
        return false; // not a .bit file

    std::string project, part, date, time;

    bool eof = false;
    while(!eof) {
        epicsUInt8 id;
        epicsUInt16 size;

        if(strm.read((char*)&id, 1).gcount()==0)
            break;

        switch(id) {
        case 0x61:
        case 0x62:
        case 0x63:
        case 0x64:
            if(strm.read((char*)&size, 2).gcount()!=2)
                throw std::runtime_error("Truncated block header");
            size = ntohs(size);
            buf.resize(size);
            if(strm.read(&buf[0], buf.size()).gcount()!=std::streamsize(buf.size()))
                throw std::runtime_error("Truncated block payload");

            // there are all actually printable strings, so ensure they have a trailing nil.
            buf.push_back('\0');

            break;
        case 0x65:
            // start of bit stream content, we treat this as end of "header" and stop here.
            // in practice there is nothing after the bit stream anyway.
            eof = true;
            break;
        default:
            fprintf(stderr, "Warning: attempting to ignore unknown block 0x%02x\n", unsigned(id));
            eof = true;
            break;
        }

        std::string str(&buf[0]);

        switch(id) {
        case 0x61: project.swap(str); break;
        case 0x62: part.swap(str); break;
        case 0x63: date.swap(str); break;
        case 0x64: time.swap(str); break;
        }
    }

    date += " ";
    date += time;

    this->project.swap(project);
    this->part.swap(part);
    this->date.swap(date);
    return true;
}

Member Data Documentation

date

std::string mrf::XilinxBitInfo::date

Definition at line 110 of file flash.h.

part

std::string mrf::XilinxBitInfo::part

Definition at line 110 of file flash.h.

project

std::string mrf::XilinxBitInfo::project

Definition at line 110 of file flash.h.

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The documentation for this struct was generated from the following files:

• flash.h
• flash.cpp