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Small space-saving optimisation

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git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@687 212acab6-be3b-0410-9dea-997c60f758d6
This commit is contained in:
eccles 2002-08-11 18:58:41 +00:00
parent 8b9d432f7e
commit c05a873977
2 changed files with 25 additions and 30 deletions
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39
Source/crc32.c
View file

@ -2,33 +2,28 @@
#ifdef NSIS_CONFIG_CRC_SUPPORT #ifdef NSIS_CONFIG_CRC_SUPPORT
// this is based on the (slow,small) CRC32 implementation from zlib. // this is based on the (slow,small) CRC32 implementation from zlib.
static unsigned long crc_table[256];
static void make_crc_table()
{
unsigned long c;
int n, k;
for (n = 0; n < 256; n++)
{
c = (unsigned long)n;
for (k = 0; k < 8; k++) c = (c >> 1) ^ (c & 1 ? 0xedb88320L : 0);
crc_table[n] = c;
}
}
// actually CRC32, but we put it in here so we don't
// have to modify the other code.
unsigned long CRC32(unsigned long crc, const unsigned char *buf, unsigned int len) unsigned long CRC32(unsigned long crc, const unsigned char *buf, unsigned int len)
{ {
if (!crc_table[1]) make_crc_table(); static unsigned long crc_table[256];
if (!crc_table[1])
{
unsigned long c;
int n, k;
for (n = 0; n < 256; n++)
{
c = (unsigned long)n;
for (k = 0; k < 8; k++) c = (c >> 1) ^ (c & 1 ? 0xedb88320L : 0);
crc_table[n] = c;
}
}
crc = crc ^ 0xffffffffL; crc = crc ^ 0xffffffffL;
while (len-- > 0) { while (len-- > 0) {
crc = crc_table[(crc ^ (*buf++)) & 0xff] ^ (crc >> 8); crc = crc_table[(crc ^ (*buf++)) & 0xff] ^ (crc >> 8);
} }
return crc ^ 0xffffffffL; return crc ^ 0xffffffffL;
} }
#endif #endif

16
Source/exehead/bgbg.c
View file

@ -19,24 +19,24 @@ static LRESULT CALLBACK BG_WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM l
int y; int y;
GetClientRect(hwnd,&r); GetClientRect(hwnd,&r);
// this portion by Drew Davidson, drewdavidson@mindspring.com // this portion by Drew Davidson, drewdavidson@mindspring.com
// JF: made slower, reduced to 4 pixels high, because I like how it looks better/ // JF: made slower, reduced to 4 pixels high, because I like how it looks better/
for (y = r.top; y < r.bottom; y += 4) for (y = r.top; y < r.bottom; y += 4)
{ {
int rv,gv,bv; int rv,gv,bv;
RECT rect; RECT rect;
HBRUSH brush; HBRUSH brush;
rv = GetRValue(m_color2) * y / r.bottom + GetRValue(m_color1) * (r.bottom - y) / r.bottom; rv = (GetRValue(m_color2) * y + GetRValue(m_color1) * (r.bottom - y)) / r.bottom;
gv = GetGValue(m_color2) * y / r.bottom + GetGValue(m_color1) * (r.bottom - y) / r.bottom; gv = (GetGValue(m_color2) * y + GetGValue(m_color1) * (r.bottom - y)) / r.bottom;
bv = GetBValue(m_color2) * y / r.bottom + GetBValue(m_color1) * (r.bottom - y) / r.bottom; bv = (GetBValue(m_color2) * y + GetBValue(m_color1) * (r.bottom - y)) / r.bottom;
brush = CreateSolidBrush(RGB(rv,gv,bv)); brush = CreateSolidBrush(RGB(rv,gv,bv));
SetRect(&rect, r.left, y, r.right, y+4); SetRect(&rect, r.left, y, r.right, y+4);
// note that we don't need to do "SelectObject(hdc, brush)" // note that we don't need to do "SelectObject(hdc, brush)"
// because FillRect lets us specify the brush as a parameter. // because FillRect lets us specify the brush as a parameter.
FillRect(hdc, &rect, brush); FillRect(hdc, &rect, brush);
DeleteObject(brush); DeleteObject(brush);
} }
if (m_textcolor != -1) if (m_textcolor != -1)
{ {
newFont = CreateFont(40,0,0,0,FW_BOLD,TRUE,FALSE,FALSE,DEFAULT_CHARSET,OUT_DEFAULT_PRECIS,CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,DEFAULT_PITCH,"Garamond"); newFont = CreateFont(40,0,0,0,FW_BOLD,TRUE,FALSE,FALSE,DEFAULT_CHARSET,OUT_DEFAULT_PRECIS,CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,DEFAULT_PITCH,"Garamond");
@ -79,7 +79,7 @@ HWND bgWnd_Init(HINSTANCE hInstance, char *title, int color1, int color2, int co
m_color1=color1; m_color1=color1;
m_color2=color2; m_color2=color2;
m_textcolor=color3; m_textcolor=color3;
SystemParametersInfo(SPI_GETWORKAREA, 0, &vp, 0); SystemParametersInfo(SPI_GETWORKAREA, 0, &vp, 0);
return CreateWindow(classname,title,WS_VISIBLE|WS_OVERLAPPED|WS_THICKFRAME|WS_CAPTION|WS_SYSMENU|WS_MAXIMIZEBOX|WS_MINIMIZEBOX, return CreateWindow(classname,title,WS_VISIBLE|WS_OVERLAPPED|WS_THICKFRAME|WS_CAPTION|WS_SYSMENU|WS_MAXIMIZEBOX|WS_MINIMIZEBOX,
@ -87,4 +87,4 @@ HWND bgWnd_Init(HINSTANCE hInstance, char *title, int color1, int color2, int co
} }
#endif //NSIS_SUPPORT_BGBG #endif //NSIS_SUPPORT_BGBG