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0
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1 /*
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2
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3 Package: dyncall
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4 Library: dynload
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5 File: dynload/dynload_syms_pe.c
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6 Description:
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7 License:
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8
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9 Copyright (c) 2007-2015 Daniel Adler <dadler@uni-goettingen.de>,
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10 Tassilo Philipp <tphilipp@potion-studios.com>
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11 Olivier Chafik <olivier.chafik@gmail.com>
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12
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13 Permission to use, copy, modify, and distribute this software for any
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14 purpose with or without fee is hereby granted, provided that the above
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15 copyright notice and this permission notice appear in all copies.
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16
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17 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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18 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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19 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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20 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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21 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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22 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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23 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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24
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25 */
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26
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27
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28
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29 #include "dynload.h"
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30 #include "dynload_alloc.h"
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31
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32 #include <windows.h>
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33
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34 struct DLLib_
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35 {
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36 IMAGE_DOS_HEADER dos_header;
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37 };
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38
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39
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40 struct DLSyms_
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41 {
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42 DLLib* pLib;
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43 const char* pBase;
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44 const DWORD* pNames;
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45 const DWORD* pFuncs;
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46 const unsigned short* pOrds;
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47 size_t count;
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48 };
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49
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50
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51 DLSyms* dlSymsInit(const char* libPath)
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52 {
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53 DLLib* pLib = dlLoadLibrary(libPath);
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54 DLSyms* pSyms = (DLSyms*)dlAllocMem(sizeof(DLSyms));
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55 const char* base = (const char*) pLib;
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56 IMAGE_DOS_HEADER* pDOSHeader = (IMAGE_DOS_HEADER*) base;
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57 IMAGE_NT_HEADERS* pNTHeader = (IMAGE_NT_HEADERS*) ( base + pDOSHeader->e_lfanew );
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58 IMAGE_DATA_DIRECTORY* pExportsDataDir = &pNTHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT];
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59 IMAGE_EXPORT_DIRECTORY* pExports = (IMAGE_EXPORT_DIRECTORY*) (base + pExportsDataDir->VirtualAddress);
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60
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61 pSyms->pBase = base;
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62 pSyms->pNames = (DWORD*)(base + pExports->AddressOfNames);
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63 pSyms->pFuncs = (DWORD*)(base + pExports->AddressOfFunctions);
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64 pSyms->pOrds = (unsigned short*)(base + pExports->AddressOfNameOrdinals);
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65 pSyms->count = (size_t)pExports->NumberOfNames;
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66 pSyms->pLib = pLib;
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67
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68 return pSyms;
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69 }
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70
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71
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72 void dlSymsCleanup(DLSyms* pSyms)
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73 {
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74 if(pSyms) {
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75 dlFreeLibrary(pSyms->pLib);
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76 dlFreeMem(pSyms);
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77 }
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78 }
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79
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80
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81 int dlSymsCount(DLSyms* pSyms)
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82 {
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83 return (int)pSyms->count;
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84 }
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85
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86
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87 const char* dlSymsName(DLSyms* pSyms, int index)
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88 {
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89 return (const char*)((const char*)pSyms->pBase + pSyms->pNames[index]);
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90 }
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91
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92
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93 void* dlSymsValue(DLSyms* pSyms, int index)
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94 {
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95 return (void*)(pSyms->pBase + pSyms->pFuncs[pSyms->pOrds[index]]);
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96 }
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97
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98
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99 const char* dlSymsNameFromValue(DLSyms* pSyms, void* value)
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100 {
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101 int i, c=dlSymsCount(pSyms);
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102 for(i=0; i<c; ++i)
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103 {
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104 if(dlSymsValue(pSyms, i) == value)
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105 return dlSymsName(pSyms, i);
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106 }
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107
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108 /* Not found. */
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109 return NULL;
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110 }
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