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|
// Convert DMD CodeView debug information to PDB files
// Copyright (c) 2009-2010 by Rainer Schuetze, All Rights Reserved
//
// License for redistribution is given by the Artistic License 2.0
// see file LICENSE for further details
#include "PEImage.h"
extern "C" {
#include "mscvpdb.h"
}
#include <stdio.h>
#include <io.h>
#include <fcntl.h>
#include <ctype.h>
#include <direct.h>
#include <share.h>
#include <sys/stat.h>
#include <vector>
#ifdef UNICODE
#define T_sopen _wsopen
#define T_open _wopen
#else
#define T_sopen sopen
#define T_open open
#endif
///////////////////////////////////////////////////////////////////////
PEImage::PEImage(const TCHAR* iname)
: dump_base(0)
, dump_total_len(0)
, dirHeader(0)
, hdr32(0)
, hdr64(0)
, fd(-1)
, debug_aranges(0)
, debug_pubnames(0)
, debug_pubtypes(0)
, debug_info(0)
, debug_abbrev(0)
, debug_line(0)
, debug_frame(0)
, debug_str(0)
, debug_loc(0)
, debug_ranges(0)
, codeSegment(0)
, linesSegment(-1)
, reloc(0)
, reloc_length(0)
, nsec(0)
, nsym(0)
, symtable(0)
, strtable(0)
, bigobj(false)
{
if(iname)
loadExe(iname);
}
PEImage::~PEImage()
{
if(fd != -1)
close(fd);
if(dump_base)
free_aligned(dump_base);
}
///////////////////////////////////////////////////////////////////////
bool PEImage::readAll(const TCHAR* iname)
{
if (fd != -1)
return setError("file already open");
fd = T_sopen(iname, O_RDONLY | O_BINARY, SH_DENYWR);
if (fd == -1)
return setError("Can't open file");
struct stat s;
if (fstat(fd, &s) < 0)
return setError("Can't get size");
dump_total_len = s.st_size;
dump_base = alloc_aligned(dump_total_len, 0x1000);
if (!dump_base)
return setError("Out of memory");
if (read(fd, dump_base, dump_total_len) != dump_total_len)
return setError("Cannot read file");
close(fd);
fd = -1;
return true;
}
///////////////////////////////////////////////////////////////////////
bool PEImage::loadExe(const TCHAR* iname)
{
if (!readAll(iname))
return false;
return initCVPtr(true) || initDWARFPtr(true);
}
///////////////////////////////////////////////////////////////////////
bool PEImage::loadObj(const TCHAR* iname)
{
if (!readAll(iname))
return false;
return initDWARFObject();
}
///////////////////////////////////////////////////////////////////////
bool PEImage::save(const TCHAR* oname)
{
if (fd != -1)
return setError("file already open");
if (!dump_base)
return setError("no data to dump");
fd = T_open(oname, O_WRONLY | O_CREAT | O_BINARY | O_TRUNC, S_IREAD | S_IWRITE | S_IEXEC);
if (fd == -1)
return setError("Can't create file");
if (write(fd, dump_base, dump_total_len) != dump_total_len)
return setError("Cannot write file");
close(fd);
fd = -1;
return true;
}
///////////////////////////////////////////////////////////////////////
bool PEImage::replaceDebugSection (const void* data, int datalen, bool initCV)
{
// append new debug directory to data
IMAGE_DEBUG_DIRECTORY debugdir;
if(dbgDir)
debugdir = *dbgDir;
else
memset(&debugdir, 0, sizeof(debugdir));
int xdatalen = datalen + sizeof(debugdir);
// assume there is place for another section because of section alignment
int s;
DWORD lastVirtualAddress = 0;
int cntSections = countSections();
for(s = 0; s < cntSections; s++)
{
if (strcmp ((char*) sec [s].Name, ".debug") == 0)
{
if (s == cntSections - 1)
{
dump_total_len = sec[s].PointerToRawData;
break;
}
strcpy ((char*) sec [s].Name, ".ddebug");
printf("warning: .debug not last section, cannot remove section\n");
}
lastVirtualAddress = sec [s].VirtualAddress + sec[s].Misc.VirtualSize;
}
int align = IMGHDR(OptionalHeader.FileAlignment);
int align_len = xdatalen;
int fill = 0;
if (align > 0)
{
fill = (align - (dump_total_len % align)) % align;
align_len = ((xdatalen + align - 1) / align) * align;
}
char* newdata = (char*) alloc_aligned(dump_total_len + fill + xdatalen, 0x1000);
if(!newdata)
return setError("cannot alloc new image");
int salign_len = xdatalen;
align = IMGHDR(OptionalHeader.SectionAlignment);
if (align > 0)
{
lastVirtualAddress = ((lastVirtualAddress + align - 1) / align) * align;
salign_len = ((xdatalen + align - 1) / align) * align;
}
strcpy((char*) sec[s].Name, ".debug");
sec[s].Misc.VirtualSize = align_len; // union with PhysicalAddress;
sec[s].VirtualAddress = lastVirtualAddress;
sec[s].SizeOfRawData = xdatalen;
sec[s].PointerToRawData = dump_total_len + fill;
sec[s].PointerToRelocations = 0;
sec[s].PointerToLinenumbers = 0;
sec[s].NumberOfRelocations = 0;
sec[s].NumberOfLinenumbers = 0;
sec[s].Characteristics = IMAGE_SCN_MEM_WRITE | IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_DISCARDABLE | IMAGE_SCN_CNT_INITIALIZED_DATA;
IMGHDR(FileHeader.NumberOfSections) = s + 1;
// hdr->OptionalHeader.SizeOfImage += salign_len;
IMGHDR(OptionalHeader.SizeOfImage) = sec[s].VirtualAddress + salign_len;
IMGHDR(OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG].VirtualAddress) = lastVirtualAddress + datalen;
IMGHDR(OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG].Size) = sizeof(IMAGE_DEBUG_DIRECTORY);
// append debug data chunk to existing file image
memcpy(newdata, dump_base, dump_total_len);
memset(newdata + dump_total_len, 0, fill);
memcpy(newdata + dump_total_len + fill, data, datalen);
if(!dbgDir)
{
debugdir.Type = 2;
}
dbgDir = (IMAGE_DEBUG_DIRECTORY*) (newdata + dump_total_len + fill + datalen);
memcpy(dbgDir, &debugdir, sizeof(debugdir));
dbgDir->PointerToRawData = sec[s].PointerToRawData;
#if 0
dbgDir->AddressOfRawData = sec[s].PointerToRawData;
dbgDir->SizeOfData = sec[s].SizeOfRawData;
#else // suggested by Z3N
dbgDir->AddressOfRawData = sec[s].VirtualAddress;
dbgDir->SizeOfData = sec[s].SizeOfRawData - sizeof(IMAGE_DEBUG_DIRECTORY);
#endif
free_aligned(dump_base);
dump_base = newdata;
dump_total_len += fill + xdatalen;
return !initCV || initCVPtr(false);
}
///////////////////////////////////////////////////////////////////////
bool PEImage::initCVPtr(bool initDbgDir)
{
dos = DPV<IMAGE_DOS_HEADER> (0);
if(!dos)
return setError("file too small for DOS header");
if(dos->e_magic != IMAGE_DOS_SIGNATURE)
return setError("this is not a DOS executable");
hdr32 = DPV<IMAGE_NT_HEADERS32> (dos->e_lfanew);
hdr64 = DPV<IMAGE_NT_HEADERS64> (dos->e_lfanew);
if(!hdr32)
return setError("no optional header found");
if(hdr32->FileHeader.Machine == IMAGE_FILE_MACHINE_AMD64 ||
hdr32->FileHeader.Machine == IMAGE_FILE_MACHINE_IA64)
hdr32 = 0;
else
hdr64 = 0;
if(IMGHDR(Signature) != IMAGE_NT_SIGNATURE)
return setError("optional header does not have PE signature");
if(IMGHDR(FileHeader.SizeOfOptionalHeader) < sizeof(IMAGE_OPTIONAL_HEADER32))
return setError("optional header too small");
sec = hdr32 ? IMAGE_FIRST_SECTION(hdr32) : IMAGE_FIRST_SECTION(hdr64);
nsec = IMGHDR(FileHeader.NumberOfSections);
symtable = DPV<char>(IMGHDR(FileHeader.PointerToSymbolTable));
nsym = IMGHDR(FileHeader.NumberOfSymbols);
strtable = symtable + nsym * IMAGE_SIZEOF_SYMBOL;
if(IMGHDR(OptionalHeader.NumberOfRvaAndSizes) <= IMAGE_DIRECTORY_ENTRY_DEBUG)
return setError("too few entries in data directory");
unsigned int i;
int found = false;
for(i = 0; i < IMGHDR(OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG].Size)/sizeof(IMAGE_DEBUG_DIRECTORY); i++)
{
int off = IMGHDR(OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG].VirtualAddress) + i*sizeof(IMAGE_DEBUG_DIRECTORY);
dbgDir = RVA<IMAGE_DEBUG_DIRECTORY>(off, sizeof(IMAGE_DEBUG_DIRECTORY));
if (!dbgDir)
continue; //return setError("debug directory not placed in image");
if (dbgDir->Type != IMAGE_DEBUG_TYPE_CODEVIEW)
continue; //return setError("debug directory not of type CodeView");
cv_base = dbgDir->PointerToRawData;
OMFSignature* sig = DPV<OMFSignature>(cv_base, dbgDir->SizeOfData);
if (!sig)
return setError("invalid debug data base address and size");
if (memcmp(sig->Signature, "NB09", 4) != 0 && memcmp(sig->Signature, "NB11", 4) != 0)
{
// return setError("can only handle debug info of type NB09 and NB11");
dirHeader = 0;
dirEntry = 0;
return true;
}
dirHeader = CVP<OMFDirHeader>(sig->filepos);
if (!dirHeader)
return setError("invalid CodeView dir header data base address");
dirEntry = CVP<OMFDirEntry>(sig->filepos + dirHeader->cbDirHeader);
if (!dirEntry)
return setError("CodeView debug dir entries invalid");
return true;
}
return setError("no CodeView debug info data found");
}
///////////////////////////////////////////////////////////////////////
bool PEImage::initDWARFPtr(bool initDbgDir)
{
dos = DPV<IMAGE_DOS_HEADER> (0);
if(!dos)
return setError("file too small for DOS header");
if(dos->e_magic != IMAGE_DOS_SIGNATURE)
return setError("this is not a DOS executable");
hdr32 = DPV<IMAGE_NT_HEADERS32> (dos->e_lfanew);
hdr64 = DPV<IMAGE_NT_HEADERS64> (dos->e_lfanew);
if(!hdr32)
return setError("no optional header found");
if(hdr32->FileHeader.Machine == IMAGE_FILE_MACHINE_AMD64 ||
hdr32->FileHeader.Machine == IMAGE_FILE_MACHINE_IA64)
hdr32 = 0;
else
hdr64 = 0;
if(IMGHDR(Signature) != IMAGE_NT_SIGNATURE)
return setError("optional header does not have PE signature");
if(IMGHDR(FileHeader.SizeOfOptionalHeader) < sizeof(IMAGE_OPTIONAL_HEADER32))
return setError("optional header too small");
dbgDir = 0;
sec = hdr32 ? IMAGE_FIRST_SECTION(hdr32) : IMAGE_FIRST_SECTION(hdr64);
symtable = DPV<char>(IMGHDR(FileHeader.PointerToSymbolTable));
nsym = IMGHDR(FileHeader.NumberOfSymbols);
strtable = symtable + nsym * IMAGE_SIZEOF_SYMBOL;
initDWARFSegments();
setError(0);
return true;
}
bool PEImage::initDWARFObject()
{
IMAGE_FILE_HEADER* hdr = DPV<IMAGE_FILE_HEADER> (0);
if(!dos)
return setError("file too small for COFF header");
if (hdr->Machine == IMAGE_FILE_MACHINE_UNKNOWN && hdr->NumberOfSections == 0xFFFF)
{
static CLSID bigObjClSID = { 0xD1BAA1C7, 0xBAEE, 0x4ba9, { 0xAF, 0x20, 0xFA, 0xF6, 0x6A, 0xA4, 0xDC, 0xB8 } };
ANON_OBJECT_HEADER_BIGOBJ* bighdr = DPV<ANON_OBJECT_HEADER_BIGOBJ> (0);
if (!bighdr || bighdr->Version < 2 || bighdr->ClassID != bigObjClSID)
return setError("invalid big object file COFF header");
sec = (IMAGE_SECTION_HEADER*)((char*)(bighdr + 1) + bighdr->SizeOfData);
nsec = bighdr->NumberOfSections;
bigobj = true;
symtable = DPV<char>(bighdr->PointerToSymbolTable);
nsym = bighdr->NumberOfSymbols;
strtable = symtable + nsym * sizeof(IMAGE_SYMBOL_EX);
}
else if (hdr->Machine != IMAGE_FILE_MACHINE_UNKNOWN)
{
sec = (IMAGE_SECTION_HEADER*)(hdr + 1);
nsec = hdr->NumberOfSections;
bigobj = false;
hdr32 = (IMAGE_NT_HEADERS32*)((char*)hdr - 4); // skip back over signature
symtable = DPV<char>(IMGHDR(FileHeader.PointerToSymbolTable));
nsym = IMGHDR(FileHeader.NumberOfSymbols);
strtable = symtable + nsym * IMAGE_SIZEOF_SYMBOL;
}
else
return setError("Unknown object file format");
if (!symtable || !strtable)
return setError("Unknown object file format");
initDWARFSegments();
setError(0);
return true;
}
void PEImage::initDWARFSegments()
{
for(int s = 0; s < nsec; s++)
{
const char* name = (const char*) sec[s].Name;
if(name[0] == '/')
{
int off = strtol(name + 1, 0, 10);
name = strtable + off;
}
if(strcmp(name, ".debug_aranges") == 0)
debug_aranges = DPV<char>(sec[s].PointerToRawData, sec[s].SizeOfRawData);
if(strcmp(name, ".debug_pubnames") == 0)
debug_pubnames = DPV<char>(sec[s].PointerToRawData, sec[s].SizeOfRawData);
if(strcmp(name, ".debug_pubtypes") == 0)
debug_pubtypes = DPV<char>(sec[s].PointerToRawData, sec[s].SizeOfRawData);
if(strcmp(name, ".debug_info") == 0)
debug_info = DPV<char>(sec[s].PointerToRawData, debug_info_length = sec[s].SizeOfRawData);
if(strcmp(name, ".debug_abbrev") == 0)
debug_abbrev = DPV<char>(sec[s].PointerToRawData, debug_abbrev_length = sec[s].SizeOfRawData);
if(strcmp(name, ".debug_line") == 0)
debug_line = DPV<char>(sec[linesSegment = s].PointerToRawData, debug_line_length = sec[s].SizeOfRawData);
if(strcmp(name, ".debug_frame") == 0)
debug_frame = DPV<char>(sec[s].PointerToRawData, sec[s].SizeOfRawData);
if(strcmp(name, ".debug_str") == 0)
debug_str = DPV<char>(sec[s].PointerToRawData, sec[s].SizeOfRawData);
if(strcmp(name, ".debug_loc") == 0)
debug_loc = DPV<char>(sec[s].PointerToRawData, sec[s].SizeOfRawData);
if(strcmp(name, ".debug_ranges") == 0)
debug_ranges = DPV<char>(sec[s].PointerToRawData, debug_ranges_length = sec[s].SizeOfRawData);
if(strcmp(name, ".reloc") == 0)
reloc = DPV<char>(sec[s].PointerToRawData, reloc_length = sec[s].SizeOfRawData);
if(strcmp(name, ".text") == 0)
codeSegment = s;
}
}
bool PEImage::relocateDebugLineInfo(unsigned int img_base)
{
if(!reloc || !reloc_length)
return true;
char* relocbase = reloc;
char* relocend = reloc + reloc_length;
while(relocbase < relocend)
{
unsigned int virtadr = *(unsigned int *) relocbase;
unsigned int chksize = *(unsigned int *) (relocbase + 4);
char* p = RVA<char> (virtadr, 1);
if(p >= debug_line && p < debug_line + debug_line_length)
{
for (unsigned int w = 8; w < chksize; w += 2)
{
unsigned short entry = *(unsigned short*)(relocbase + w);
unsigned short type = (entry >> 12) & 0xf;
unsigned short off = entry & 0xfff;
if(type == 3) // HIGHLOW
{
*(long*) (p + off) += img_base;
}
}
}
if(chksize == 0 || chksize >= reloc_length)
break;
relocbase += chksize;
}
return true;
}
int PEImage::getRelocationInLineSegment(unsigned int offset) const
{
return getRelocationInSegment(linesSegment, offset);
}
int PEImage::getRelocationInSegment(int segment, unsigned int offset) const
{
if (segment < 0)
return -1;
int cnt = sec[segment].NumberOfRelocations;
IMAGE_RELOCATION* rel = DPV<IMAGE_RELOCATION>(sec[segment].PointerToRelocations, cnt * sizeof(IMAGE_RELOCATION));
if (!rel)
return -1;
for (int i = 0; i < cnt; i++)
if (rel[i].VirtualAddress == offset)
{
if (bigobj)
{
IMAGE_SYMBOL_EX* sym = (IMAGE_SYMBOL_EX*)(symtable + rel[i].SymbolTableIndex * sizeof(IMAGE_SYMBOL_EX));
if (!sym)
return -1;
return sym->SectionNumber;
}
else
{
IMAGE_SYMBOL* sym = (IMAGE_SYMBOL*)(symtable + rel[i].SymbolTableIndex * IMAGE_SIZEOF_SYMBOL);
if (!sym)
return -1;
return sym->SectionNumber;
}
}
return -1;
}
///////////////////////////////////////////////////////////////////////
struct LineInfoData
{
int funcoff;
int funcidx;
int funcsiz;
int srcfileoff;
int npairs;
int size;
};
struct LineInfoPair
{
int offset;
int line;
};
int PEImage::dumpDebugLineInfoCOFF()
{
char* f3section = 0;
char* f4section = 0;
for(int s = 0; s < nsec; s++)
{
if (strncmp((char*)sec[s].Name, ".debug$S", 8) == 0)
{
DWORD* base = DPV<DWORD>(sec[s].PointerToRawData, sec[s].SizeOfRawData);
if (!base || *base != 4)
continue;
DWORD* end = base + sec[s].SizeOfRawData / 4;
for (DWORD* p = base + 1; p < end; p += (p[1] + 3) / 4 + 2)
{
if (!f4section && p[0] == 0xf4)
f4section = (char*)p + 8;
if (!f3section && p[0] == 0xf3)
f3section = (char*)p + 8;
if (p[0] != 0xf2)
continue;
LineInfoData* info = (LineInfoData*) (p + 2);
if (p[1] != info->size + 12)
continue;
int* f3off = f4section ? (int*)(f4section + info->srcfileoff) : 0;
const char* fname = f3off ? f3section + *f3off : "unknown";
int section = getRelocationInSegment(s, (char*)info - (char*)base);
const char* secname = findSectionSymbolName(section);
printf("Sym: %s\n", secname ? secname : "<none>");
printf("File: %s\n", fname);
LineInfoPair* pairs = (LineInfoPair*)(info + 1);
for (int i = 0; i < info->npairs; i++)
printf("\tOff 0x%x: Line %d\n", pairs[i].offset, pairs[i].line & 0x7fffffff);
}
}
}
return 0;
}
int _pstrlen(const BYTE* &p)
{
int len = *p++;
if(len == 0xff && *p == 0)
{
len = p[1] | (p[2] << 8);
p += 3;
}
return len;
}
unsigned _getIndex(const BYTE* &p)
{
if (*p & 0x80)
{
p += 2;
return ((p[-2] << 8) | p[-1]) & 0x7fff;
}
return *p++;
}
int PEImage::dumpDebugLineInfoOMF()
{
std::vector<const unsigned char*> lnames;
std::vector<const unsigned char*> llnames;
const unsigned char* fname = 0;
unsigned char* base = (unsigned char*) dump_base;
if (*base != 0x80) // assume THEADR record
return -1;
unsigned char* end = base + dump_total_len;
for(unsigned char* p = base; p < end; p += *(unsigned short*)(p + 1) + 3)
{
switch(*p)
{
case 0x80: // THEADR
fname = p + 3; // pascal string
break;
case 0x96: // LNAMES
{
int len = *(unsigned short*)(p + 1);
for(const unsigned char* q = p + 3; q < p + len + 2; q += _pstrlen (q)) // defined behaviour?
lnames.push_back(q);
break;
}
case 0xCA: // LLNAMES
{
int len = *(unsigned short*)(p + 1);
for(const unsigned char* q = p + 3; q < p + len + 2; q += _pstrlen (q)) // defined behaviour?
llnames.push_back(q);
break;
}
case 0x95: // LINNUM
{
const unsigned char* q = p + 3;
int basegrp = _getIndex(q);
int baseseg = _getIndex(q);
unsigned num = (p + *(unsigned short*)(p + 1) + 2 - q) / 6;
const unsigned char* fn = fname;
int flen = fn ? _pstrlen(fn) : 0;
printf("File: %.*s, BaseSegment %d\n", flen, fn, baseseg);
for (int i = 0; i < num; i++)
printf("\tOff 0x%x: Line %d\n", *(int*)(q + 2 + 6 * i), *(unsigned short*)(p + 6 * i));
break;
}
case 0xc5: // LINSYM
{
const unsigned char* q = p + 3;
unsigned flags = *q++;
unsigned pubname = _getIndex(q);
unsigned num = (p + *(unsigned short*)(p + 1) + 2 - q) / 6;
if (num == 0)
break;
const unsigned char* fn = fname;
int flen = fn ? _pstrlen(fn) : 0;
const unsigned char* sn = (pubname == 0 || pubname > lnames.size() ? 0 : lnames[pubname-1]);
int slen = sn ? _pstrlen(sn) : 0;
printf("Sym: %.*s\n", slen, sn);
printf("File: %.*s\n", flen, fn);
for (unsigned i = 0; i < num; i++)
printf("\tOff 0x%x: Line %d\n", *(int*)(q + 2 + 6 * i), *(unsigned short*)(q + 6 * i));
break;
}
default:
break;
}
}
return 0;
}
///////////////////////////////////////////////////////////////////////
int PEImage::findSection(unsigned int off) const
{
off -= IMGHDR(OptionalHeader.ImageBase);
for(int s = 0; s < nsec; s++)
if(sec[s].VirtualAddress <= off && off < sec[s].VirtualAddress + sec[s].Misc.VirtualSize)
return s;
return -1;
}
template<typename SYM>
const char* PEImage::t_findSectionSymbolName(int s) const
{
SYM* sym = 0;
for(int i = 0; i < nsym; i += 1 + sym->NumberOfAuxSymbols)
{
sym = (SYM*) symtable + i;
if (sym->SectionNumber == s && sym->StorageClass == IMAGE_SYM_CLASS_EXTERNAL)
{
static char sname[10] = { 0 };
if (sym->N.Name.Short == 0)
return strtable + sym->N.Name.Long;
return strncpy (sname, (char*)sym->N.ShortName, 8);
}
}
return 0;
}
const char* PEImage::findSectionSymbolName(int s) const
{
if (s < 0 || s >= nsec)
return 0;
if (!(sec[s].Characteristics & IMAGE_SCN_LNK_COMDAT))
return 0;
if (bigobj)
return t_findSectionSymbolName<IMAGE_SYMBOL_EX> (s);
else
return t_findSectionSymbolName<IMAGE_SYMBOL> (s);
}
int PEImage::findSymbol(const char* name, unsigned long& off) const
{
int sizeof_sym = bigobj ? sizeof(IMAGE_SYMBOL_EX) : IMAGE_SIZEOF_SYMBOL;
for(int i = 0; i < nsym; i++)
{
IMAGE_SYMBOL* sym = (IMAGE_SYMBOL*) (symtable + i * sizeof_sym);
const char* symname = sym->N.Name.Short == 0 ? strtable + sym->N.Name.Long : (char*)sym->N.ShortName;
if(strcmp(symname, name) == 0 || (symname[0] == '_' && strcmp(symname + 1, name) == 0))
{
off = sym->Value;
return bigobj ? ((IMAGE_SYMBOL_EX*)sym)->SectionNumber : sym->SectionNumber;
}
}
return -1;
}
///////////////////////////////////////////////////////////////////////
int PEImage::countCVEntries() const
{
return dirHeader ? dirHeader->cDir : 0;
}
OMFDirEntry* PEImage::getCVEntry(int i) const
{
return dirEntry + i;
}
///////////////////////////////////////////////////////////////////////
// utilities
void* PEImage::alloc_aligned(unsigned int size, unsigned int align, unsigned int alignoff)
{
if (align & (align - 1))
return 0;
unsigned int pad = align + sizeof(void*);
char* p = (char*) malloc(size + pad);
unsigned int off = (align + alignoff - sizeof(void*) - (p - (char*) 0)) & (align - 1);
char* q = p + sizeof(void*) + off;
((void**) q)[-1] = p;
return q;
}
///////////////////////////////////////////////////////////////////////
void PEImage::free_aligned(void* p)
{
void* q = ((void**) p)[-1];
free(q);
}
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