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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
// System headers (alphabetical)
#include <fcntl.h>
#include <io.h>
#include <share.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <windows.h>
// Mozilla headers (alphabetical)
#include "mozilla/FileUtils.h" // ScopedClose
#include "mozilla/UniquePtrExtensions.h"
/*
Icon files are made up of:
IconHeader
IconDirEntry1
IconDirEntry2
...
IconDirEntryN
IconData1
IconData2
...
IconDataN
Each IconData must be added as a new RT_ICON resource to the exe. Then
an RT_GROUP_ICON resource must be added that contains an equivalent
header:
IconHeader
IconResEntry1
IconResEntry2
...
IconResEntryN
*/
#pragma pack(push, 2)
typedef struct
{
WORD Reserved;
WORD ResourceType;
WORD ImageCount;
} IconHeader;
typedef struct
{
BYTE Width;
BYTE Height;
BYTE Colors;
BYTE Reserved;
WORD Planes;
WORD BitsPerPixel;
DWORD ImageSize;
DWORD ImageOffset;
} IconDirEntry;
typedef struct
{
BYTE Width;
BYTE Height;
BYTE Colors;
BYTE Reserved;
WORD Planes;
WORD BitsPerPixel;
DWORD ImageSize;
WORD ResourceID; // This field is the one difference to above
} IconResEntry;
#pragma pack(pop)
namespace {
/**
* ScopedResourceUpdate is a RAII wrapper for Windows resource updating
*
* Instances |EndUpdateResourceW()| their handles when they go out of scope.
* They pass |TRUE| as the second argument to |EndUpdateResourceW()|, which
* causes the resource update to be aborted (changes are discarded).
*/
struct ScopedResourceUpdateTraits
{
typedef HANDLE type;
static type empty() { return nullptr; }
static void release(type handle) {
if(nullptr != handle) {
EndUpdateResourceW(handle, TRUE); // Discard changes
}
}
};
typedef mozilla::Scoped<ScopedResourceUpdateTraits> ScopedResourceUpdate;
};
#ifdef __MINGW32__
extern "C"
#endif
int
wmain(int argc, wchar_t** argv)
{
if (argc != 3) {
printf("Usage: redit <exe file> <icon file>\n");
return 1;
}
mozilla::ScopedClose file;
if (0 != _wsopen_s(&file.rwget(),
argv[2],
_O_BINARY | _O_RDONLY,
_SH_DENYWR,
_S_IREAD)
|| (-1 == file)) {
fprintf(stderr, "Unable to open icon file.\n");
return 1;
}
// Load all the data from the icon file
long filesize = _filelength(file);
auto data = MakeUniqueFallible<BYTE[]>(filesize);
if(!data) {
fprintf(stderr, "Failed to allocate memory for icon file.\n");
return 1;
}
_read(file, data.get(), filesize);
IconHeader* header = reinterpret_cast<IconHeader*>(data.get());
// Open the target library for updating
ScopedResourceUpdate updateRes(BeginUpdateResourceW(argv[1], FALSE));
if (nullptr == updateRes) {
fprintf(stderr, "Unable to open library for modification.\n");
return 1;
}
// Allocate the group resource entry
long groupSize = sizeof(IconHeader)
+ header->ImageCount * sizeof(IconResEntry);
auto group = MakeUniqueFallible<BYTE[]>(groupSize);
if(!group) {
fprintf(stderr, "Failed to allocate memory for new images.\n");
return 1;
}
memcpy(group.get(), data.get(), sizeof(IconHeader));
IconDirEntry* sourceIcon =
reinterpret_cast<IconDirEntry*>(data.get()
+ sizeof(IconHeader));
IconResEntry* targetIcon =
reinterpret_cast<IconResEntry*>(group.get()
+ sizeof(IconHeader));
for (int id = 1; id <= header->ImageCount; id++) {
// Add the individual icon
if (!UpdateResourceW(updateRes, RT_ICON, MAKEINTRESOURCE(id),
MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL),
data + sourceIcon->ImageOffset,
sourceIcon->ImageSize)) {
fprintf(stderr, "Unable to update resource (RT_ICON).\n");
return 1;
}
// Copy the data for this icon
// (note that the structs have different sizes)
memcpy(targetIcon, sourceIcon, sizeof(IconResEntry));
targetIcon->ResourceID = id;
sourceIcon++;
targetIcon++;
}
if (!UpdateResourceW(updateRes, RT_GROUP_ICON, L"MAINICON",
MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL),
group, groupSize)) {
fprintf(stderr, "Unable to update resource (RT_GROUP_ICON).\n");
return 1;
}
// Save the modifications
if(!EndUpdateResourceW(updateRes.forget(), FALSE)) {
fprintf(stderr, "Unable to write changes to library.\n");
return 1;
}
return 0;
}
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