| 1 | /*
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| 2 | * Copyright (C) 1995-2009 Contributors
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| 3 | * More detailed copyright information can be found in the individual source code files.
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| 4 | *
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| 5 | * This software is provided 'as-is', without any express or implied warranty.
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| 6 | * In no event will the authors be held liable for any damages arising from the use of this software.
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| 7 | *
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| 8 | * Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter
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| 9 | * it and redistribute it freely, subject to the following restrictions:
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| 10 | *
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| 11 | * 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software.
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| 12 | * If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
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| 13 | * 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
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| 14 | * 3. This notice may not be removed or altered from any source distribution.
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| 15 | */
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| 16 |
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| 17 | /** Taken from:
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| 18 | * http://nsis.sourceforge.net/Examples/Plugin/exdll.h
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| 19 | */
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| 20 |
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| 21 | #ifndef _EXDLL_H_
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| 22 | #define _EXDLL_H_
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| 23 |
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| 24 | #include <windows.h>
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| 25 |
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| 26 | #if defined(__GNUC__)
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| 27 | #define UNUSED __attribute__((unused))
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| 28 | #else
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| 29 | #define UNUSED
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| 30 | #endif
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| 31 |
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| 32 | // only include this file from one place in your DLL.
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| 33 | // (it is all static, if you use it in two places it will fail)
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| 34 |
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| 35 | #define EXDLL_INIT() { \
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| 36 | g_stringsize=string_size; \
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| 37 | g_stacktop=stacktop; \
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| 38 | g_variables=variables; }
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| 39 |
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| 40 | typedef struct _stack_t {
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| 41 | struct _stack_t *next;
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| 42 | char text[1]; // this should be the length of string_size
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| 43 | } stack_t;
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| 44 |
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| 45 |
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| 46 | static unsigned int g_stringsize;
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| 47 | static stack_t **g_stacktop;
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| 48 | static char *g_variables;
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| 49 |
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| 50 | static int __stdcall popstring(char *str) UNUSED; // 0 on success, 1 on empty stack
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| 51 | static void __stdcall pushstring(const char *str) UNUSED;
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| 52 | static char * __stdcall getuservariable(const int varnum) UNUSED;
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| 53 | static void __stdcall setuservariable(const int varnum, const char *var) UNUSED;
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| 54 |
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| 55 | enum
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| 56 | {
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| 57 | INST_0, // $0
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| 58 | INST_1, // $1
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| 59 | INST_2, // $2
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| 60 | INST_3, // $3
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| 61 | INST_4, // $4
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| 62 | INST_5, // $5
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| 63 | INST_6, // $6
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| 64 | INST_7, // $7
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| 65 | INST_8, // $8
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| 66 | INST_9, // $9
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| 67 | INST_R0, // $R0
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| 68 | INST_R1, // $R1
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| 69 | INST_R2, // $R2
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| 70 | INST_R3, // $R3
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| 71 | INST_R4, // $R4
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| 72 | INST_R5, // $R5
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| 73 | INST_R6, // $R6
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| 74 | INST_R7, // $R7
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| 75 | INST_R8, // $R8
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| 76 | INST_R9, // $R9
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| 77 | INST_CMDLINE, // $CMDLINE
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| 78 | INST_INSTDIR, // $INSTDIR
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| 79 | INST_OUTDIR, // $OUTDIR
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| 80 | INST_EXEDIR, // $EXEDIR
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| 81 | INST_LANG, // $LANGUAGE
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| 82 | __INST_LAST
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| 83 | };
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| 84 |
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| 85 | // utility functions (not required but often useful)
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| 86 | static int __stdcall popstring(char *str)
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| 87 | {
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| 88 | stack_t *th;
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| 89 | if (!g_stacktop || !*g_stacktop)
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| 90 | return 1;
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| 91 | th=(*g_stacktop);
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| 92 | lstrcpyA(str,th->text);
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| 93 | *g_stacktop = th->next;
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| 94 | GlobalFree((HGLOBAL)th);
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| 95 | return 0;
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| 96 | }
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| 97 |
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| 98 | static void __stdcall pushstring(const char *str)
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| 99 | {
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| 100 | stack_t *th;
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| 101 | if (!g_stacktop)
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| 102 | return;
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| 103 | th=(stack_t*)GlobalAlloc(GPTR,sizeof(stack_t)+g_stringsize);
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| 104 | lstrcpynA(th->text,str,g_stringsize);
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| 105 | th->next=*g_stacktop;
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| 106 | *g_stacktop=th;
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| 107 | }
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| 108 |
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| 109 | static char * __stdcall getuservariable(const int varnum)
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| 110 | {
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| 111 | if (varnum < 0 || varnum >= __INST_LAST)
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| 112 | return NULL;
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| 113 | return g_variables+varnum*g_stringsize;
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| 114 | }
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| 115 |
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| 116 | static void __stdcall setuservariable(const int varnum, const char *var)
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| 117 | {
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| 118 | if (var != NULL && varnum >= 0 && varnum < __INST_LAST)
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| 119 | lstrcpyA(g_variables + varnum*g_stringsize, var);
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| 120 | }
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| 121 | #endif//_EXDLL_H_
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