bintools/checklib/library/library.cpp
author Alex Gilkes <alex.gilkes@nokia.com>
Tue, 27 Oct 2009 16:36:35 +0000
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// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// Class for reading libraries in Unix "ar" format.
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// 
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//
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#include "library.h"
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#include "misc/endian.h" // For misc::reverse_bytes()
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#include <fstream>
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#include <stdexcept>
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#include <cassert>
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#include <iostream>
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#include <iomanip>
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#include <cstdlib>
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namespace
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{
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    // An ar library begins with this string.
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    const char MAGIC[] = "!<arch>\n";
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    // The size of an object header.
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    const int HEADER_LENGTH = 60;
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    // Each object *header* has this trailer.
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    const char TRAILER[] = "`\n";
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}
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Library::Library(const char a_file_name[])
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{
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    std::ifstream file(a_file_name, std::ios::in | std::ios::binary | std::ios::ate);
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    if ( ! file.is_open() )
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    {
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        throw std::runtime_error("couldn't open file");
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    }
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    unsigned size  = file.tellg();
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    m_mem_p = new char[size];
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    file.seekg(0, std::ios::beg);
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    file.read( const_cast<char*>(m_mem_p), size );
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    file.close();
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    const char* p1 = m_mem_p;
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    const char* p2 = p1 + size - 1;
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    // Eat all meta objects.
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    p1 = _eat_ar_header(p1, p2);
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    p1 = _eat_sym_table(p1, p2);
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    p1 = _eat_junk_objs(p1, p2);
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    m_first_p = p1; // Pointer to the start of the first "real" object.
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    m_last_p = p2;  // Pointer to end of the last real object.
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}
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Library::~Library()
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{
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    delete[] m_mem_p;
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}
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bool Library::contains_symbol(const char a_sym_name[]) const
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{
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    std::vector<const char*>::const_iterator p = m_symbols.begin();
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    std::vector<const char*>::const_iterator end_p = m_symbols.end();
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    for ( ; p != end_p; ++p)
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    {
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        if ( std::strcmp(a_sym_name, *p) == 0 ) return 1;
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    }
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    return 0;
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}
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const std::vector< std::pair<const char*, const char*> >* Library::get_objects() const
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{
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    if ( m_objects.empty() )
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    {
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        const char* p = m_first_p;
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        unsigned long size;
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        while (p < m_last_p)
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        {
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            p = _eat_obj_header(p, m_last_p, &size);
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            m_objects.push_back( std::pair<const char*, const char*>(p, p + size) );
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            p += size;
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        }
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    }
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    return &m_objects;
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}
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const char* Library::_eat_ar_header(const char* p1, const char* p2) const
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{
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    int magic_length = std::strlen(MAGIC);
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    if (p2 - p1 + 1 < magic_length)
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    {
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        throw std::runtime_error("library too small for magic word");
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    }
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    if ( std::strncmp(p1, MAGIC, magic_length) != 0 )
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    {
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        throw std::runtime_error("bad magic; this is not a valid library");
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    }
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    return (p1 + magic_length);
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}
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const char* Library::_eat_sym_table(const char* a_first_p, const char* a_last_p) const
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{
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    unsigned long obj_size;
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    const char* p = _eat_obj_header(a_first_p, a_last_p, &obj_size, "/               "); // Read the header of the symbol table.
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    if (p == a_first_p)
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    {
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        throw std::runtime_error("no library symbol table found");
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    }
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    const char* obj_end_p = p + obj_size;
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    // Check that we're 4-byte aligned.
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    assert( (reinterpret_cast<int>(p) & 0x3) == 0 );
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    uint32_t nr_of_syms = *reinterpret_cast<const int*>(p);
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    nr_of_syms = misc::reverse_bytes(nr_of_syms);
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    p += sizeof(nr_of_syms);            // Go past the integer we just read.
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    p += nr_of_syms * sizeof(uint32_t); // Go past all the offsets.
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    unsigned n = 0;
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    while (n < nr_of_syms && p < a_last_p)
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    {
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        m_symbols.push_back(p);
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        p += std::strlen(p) + 1; 
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        n++;
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    }
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    if (n != nr_of_syms)
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    {
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        throw std::runtime_error("inconsistent symbol table");
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    }
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    if (p > obj_end_p)
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    {
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        throw std::runtime_error("over-running symbol table");
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    }
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    return obj_end_p;
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}
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const char* Library::_eat_junk_objs(const char* p1, const char* p2) const
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{
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    unsigned long obj_size;
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    const char* p;
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    p = _eat_obj_header(p1, p2, &obj_size, "//              ");
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    if (p > p1)
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    {
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        p1 = p + obj_size;
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    }
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    p = _eat_obj_header(p1, p2, &obj_size, "/               ");
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    if (p > p1)
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    {
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        p1 = p + obj_size;
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    }
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    p = _eat_obj_header(p1, p2, &obj_size, "//              ");
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    if (p > p1)
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    {
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        p1 = p + obj_size;
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    }
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    return p1;
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}
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const char* Library::_eat_obj_header(const char* a_first_p, const char* a_last_p, unsigned long* a_size_p, const char* a_name) const
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{
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    const char* p = a_first_p;
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    // The header is 2-byte aligned, so ignore the previous object's trailing
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    // padding byte.
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    if ( reinterpret_cast<int>(p) & 1)
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    {
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        p++;
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    }
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    if (a_last_p - p + 1 < HEADER_LENGTH)
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    {
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        throw std::runtime_error("no space for library object header");
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    }
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    // At the moment We can only handle short names. This is enough for identifying
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    // the meta objects "/" (symbol table) and "//" (object table).
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   221
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    if ( a_name && std::strncmp(p, a_name, std::strlen(a_name)) != 0 )
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    {
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   224
        return a_first_p;
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   225
    }
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    p += 16; // Ignore the name field.
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    p += 12; // Ignore the modification time.
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    p +=  6; // Ignore the group ID.
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    p +=  6; // Ignore the user ID.
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    p +=  8; // Ignore the file mode.
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   232
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    // Read the object size.
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   234
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   235
    if (a_size_p)
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    {
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   237
        char* tail_p;
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        *a_size_p = std::strtoul(p, &tail_p, 0);
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   239
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   240
        if (tail_p == p || tail_p > a_last_p + 1)
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   241
        {
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   242
            throw std::runtime_error("could not read library object size");
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   243
        }
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   244
    }
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   245
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   246
    p += 10; // Jump over the object size field.
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   247
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   248
    // Verify that the header trailer is correct.
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   249
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   250
    int trailer_length = std::strlen(TRAILER);
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   251
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   252
    if ( std::strncmp(p, TRAILER, trailer_length) != 0  )
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   253
    {
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   254
        throw std::runtime_error("incorrect library object header trailer");
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   255
    }
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   256
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   257
    return (p + trailer_length);
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   258
}
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   259
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   260