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Subject[PATCH 10/20] inflate: (arch) kill external CRC calculation
inflate: move CRC calculation

Each inflate user was doing its own open-coded CRC calculation and
initializing its own CRC table. This is now hidden inside
lib/inflate.c

Signed-off-by: Matt Mackall <mpm@selenic.com>

Index: 2.6.14/arch/alpha/boot/misc.c
===================================================================
--- 2.6.14.orig/arch/alpha/boot/misc.c 2005-10-28 22:04:13.000000000 -0700
+++ 2.6.14/arch/alpha/boot/misc.c 2005-10-28 22:04:15.000000000 -0700
@@ -80,22 +80,19 @@ int fill_inbuf(void)
}

/* ===========================================================================
- * Write the output window window[0..outcnt-1] and update crc and bytes_out.
+ * Write the output window window[0..outcnt-1] and update bytes_out.
* (Used for the decompressed data only.)
*/
void flush_window(void)
{
- ulg c = crc;
unsigned n;
uch *in, *out, ch;

in = window;
out = &output_data[output_ptr];
- for (n = 0; n < outcnt; n++) {
+ for (n = 0; n < outcnt; n++)
ch = *out++ = *in++;
- c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
- }
- crc = c;
+
bytes_out += (ulg)outcnt;
output_ptr += (ulg)outcnt;
outcnt = 0;
@@ -129,7 +126,6 @@ decompress_kernel(void *output_start,
/* put in temp area to reduce initial footprint */
window = malloc(WSIZE);

- makecrc();
/* puts("Uncompressing Linux..."); */
gunzip();
/* puts(" done, booting the kernel.\n"); */
Index: 2.6.14/arch/arm/boot/compressed/misc.c
===================================================================
--- 2.6.14.orig/arch/arm/boot/compressed/misc.c 2005-10-28 22:04:13.000000000 -0700
+++ 2.6.14/arch/arm/boot/compressed/misc.c 2005-10-28 22:04:15.000000000 -0700
@@ -104,22 +104,19 @@ int fill_inbuf(void)
}

/* ===========================================================================
- * Write the output window window[0..outcnt-1] and update crc and bytes_out.
+ * Write the output window window[0..outcnt-1] and update bytes_out.
* (Used for the decompressed data only.)
*/
void flush_window(void)
{
- ulg c = crc;
unsigned n;
uch *in, *out, ch;

in = window;
out = &output_data[output_ptr];
- for (n = 0; n < outcnt; n++) {
+ for (n = 0; n < outcnt; n++)
ch = *out++ = *in++;
- c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
- }
- crc = c;
+
bytes_out += (ulg)outcnt;
output_ptr += (ulg)outcnt;
outcnt = 0;
@@ -148,7 +145,6 @@ decompress_kernel(ulg output_start, ulg

arch_decomp_setup();

- makecrc();
putstr("Uncompressing Linux...");
gunzip();
putstr(" done, booting the kernel.\n");
@@ -162,7 +158,6 @@ int main()
{
output_data = output_buffer;

- makecrc();
putstr("Uncompressing Linux...");
gunzip();
putstr("done.\n");
Index: 2.6.14/arch/arm26/boot/compressed/misc.c
===================================================================
--- 2.6.14.orig/arch/arm26/boot/compressed/misc.c 2005-10-28 22:04:13.000000000 -0700
+++ 2.6.14/arch/arm26/boot/compressed/misc.c 2005-10-28 22:04:15.000000000 -0700
@@ -89,22 +89,19 @@ int fill_inbuf(void)
}

/* ===========================================================================
- * Write the output window window[0..outcnt-1] and update crc and bytes_out.
+ * Write the output window window[0..outcnt-1] and update bytes_out.
* (Used for the decompressed data only.)
*/
void flush_window(void)
{
- ulg c = crc;
unsigned n;
uch *in, *out, ch;

in = window;
out = &output_data[output_ptr];
- for (n = 0; n < outcnt; n++) {
+ for (n = 0; n < outcnt; n++)
ch = *out++ = *in++;
- c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
- }
- crc = c;
+
bytes_out += (ulg)outcnt;
output_ptr += (ulg)outcnt;
outcnt = 0;
@@ -135,7 +132,6 @@ decompress_kernel(ulg output_start, ulg

arch_decomp_setup();

- makecrc();
puts("Uncompressing Linux...");
gunzip();
puts(" done, booting the kernel.\n");
@@ -149,7 +145,6 @@ int main()
{
output_data = output_buffer;

- makecrc();
puts("Uncompressing Linux...");
gunzip();
puts("done.\n");
Index: 2.6.14/arch/cris/arch-v10/boot/compressed/misc.c
===================================================================
--- 2.6.14.orig/arch/cris/arch-v10/boot/compressed/misc.c 2005-10-28 22:04:13.000000000 -0700
+++ 2.6.14/arch/cris/arch-v10/boot/compressed/misc.c 2005-10-28 22:04:15.000000000 -0700
@@ -95,24 +95,21 @@ puts(const char *s)
}

/* ===========================================================================
- * Write the output window window[0..outcnt-1] and update crc and bytes_out.
+ * Write the output window window[0..outcnt-1] and update bytes_out.
* (Used for the decompressed data only.)
*/

static void
flush_window()
{
- ulg c = crc; /* temporary variable */
unsigned n;
uch *in, *out, ch;
-
+
in = window;
- out = &output_data[output_ptr];
- for (n = 0; n < outcnt; n++) {
+ out = &output_data[output_ptr];
+ for (n = 0; n < outcnt; n++)
ch = *out++ = *in++;
- c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
- }
- crc = c;
+
bytes_out += (ulg)outcnt;
output_ptr += (ulg)outcnt;
outcnt = 0;
@@ -167,8 +164,6 @@ decompress_kernel()

setup_normal_output_buffer();

- makecrc();
-
__asm__ volatile ("move vr,%0" : "=rm" (revision));
if (revision < 10)
{
Index: 2.6.14/arch/cris/arch-v32/boot/compressed/misc.c
===================================================================
--- 2.6.14.orig/arch/cris/arch-v32/boot/compressed/misc.c 2005-10-28 22:04:13.000000000 -0700
+++ 2.6.14/arch/cris/arch-v32/boot/compressed/misc.c 2005-10-28 22:04:15.000000000 -0700
@@ -109,24 +109,21 @@ puts(const char *s)
}

/* ===========================================================================
- * Write the output window window[0..outcnt-1] and update crc and bytes_out.
+ * Write the output window window[0..outcnt-1] and update bytes_out.
* (Used for the decompressed data only.)
*/

static void
flush_window()
{
- ulg c = crc; /* temporary variable */
unsigned n;
uch *in, *out, ch;

in = window;
out = &output_data[output_ptr];
- for (n = 0; n < outcnt; n++) {
+ for (n = 0; n < outcnt; n++)
ch = *out++ = *in++;
- c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
- }
- crc = c;
+
bytes_out += (ulg)outcnt;
output_ptr += (ulg)outcnt;
outcnt = 0;
@@ -212,8 +209,6 @@ decompress_kernel()

setup_normal_output_buffer();

- makecrc();
-
__asm__ volatile ("move $vr,%0" : "=rm" (revision));
if (revision < 32)
{
Index: 2.6.14/arch/i386/boot/compressed/misc.c
===================================================================
--- 2.6.14.orig/arch/i386/boot/compressed/misc.c 2005-10-28 22:04:13.000000000 -0700
+++ 2.6.14/arch/i386/boot/compressed/misc.c 2005-10-28 22:04:15.000000000 -0700
@@ -150,22 +150,19 @@ static int fill_inbuf(void)
}

/* ===========================================================================
- * Write the output window window[0..outcnt-1] and update crc and bytes_out.
+ * Write the output window window[0..outcnt-1] and update bytes_out.
* (Used for the decompressed data only.)
*/
static void flush_window_low(void)
{
- ulg c = crc; /* temporary variable */
unsigned n;
uch *in, *out, ch;
-
+
in = window;
- out = &output_data[output_ptr];
- for (n = 0; n < outcnt; n++) {
+ out = &output_data[output_ptr];
+ for (n = 0; n < outcnt; n++)
ch = *out++ = *in++;
- c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
- }
- crc = c;
+
bytes_out += (ulg)outcnt;
output_ptr += (ulg)outcnt;
outcnt = 0;
@@ -173,16 +170,14 @@ static void flush_window_low(void)

static void flush_window_high(void)
{
- ulg c = crc; /* temporary variable */
unsigned n;
uch *in, ch;
in = window;
for (n = 0; n < outcnt; n++) {
ch = *output_data++ = *in++;
if ((ulg)output_data == low_buffer_end) output_data=high_buffer_start;
- c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
}
- crc = c;
+
bytes_out += (ulg)outcnt;
outcnt = 0;
}
@@ -281,7 +276,6 @@ asmlinkage int decompress_kernel(struct
if (free_mem_ptr < 0x100000) setup_normal_output_buffer();
else setup_output_buffer_if_we_run_high(mv);

- makecrc();
putstr("Uncompressing Linux... ");
gunzip();
putstr("Ok, booting the kernel.\n");
Index: 2.6.14/arch/m32r/boot/compressed/misc.c
===================================================================
--- 2.6.14.orig/arch/m32r/boot/compressed/misc.c 2005-10-28 22:04:13.000000000 -0700
+++ 2.6.14/arch/m32r/boot/compressed/misc.c 2005-10-28 22:04:15.000000000 -0700
@@ -70,22 +70,19 @@ static int fill_inbuf(void)
}

/* ===========================================================================
- * Write the output window window[0..outcnt-1] and update crc and bytes_out.
+ * Write the output window window[0..outcnt-1] and update bytes_out.
* (Used for the decompressed data only.)
*/
static void flush_window(void)
{
- ulg c = crc; /* temporary variable */
unsigned n;
uch *in, *out, ch;

in = window;
out = &output_data[output_ptr];
- for (n = 0; n < outcnt; n++) {
+ for (n = 0; n < outcnt; n++)
ch = *out++ = *in++;
- c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
- }
- crc = c;
+
bytes_out += (ulg)outcnt;
output_ptr += (ulg)outcnt;
outcnt = 0;
@@ -112,7 +109,6 @@ decompress_kernel(int mmu_on, unsigned c
input_data = zimage_data;
input_len = zimage_len;

- makecrc();
puts("Uncompressing Linux... ");
gunzip();
puts("Ok, booting the kernel.\n");
Index: 2.6.14/arch/sh/boot/compressed/misc.c
===================================================================
--- 2.6.14.orig/arch/sh/boot/compressed/misc.c 2005-10-28 22:04:13.000000000 -0700
+++ 2.6.14/arch/sh/boot/compressed/misc.c 2005-10-28 22:04:15.000000000 -0700
@@ -98,22 +98,19 @@ static int fill_inbuf(void)
}

/* ===========================================================================
- * Write the output window window[0..outcnt-1] and update crc and bytes_out.
+ * Write the output window window[0..outcnt-1] and update bytes_out.
* (Used for the decompressed data only.)
*/
static void flush_window(void)
{
- ulg c = crc; /* temporary variable */
unsigned n;
uch *in, *out, ch;

in = window;
out = &output_data[output_ptr];
- for (n = 0; n < outcnt; n++) {
+ for (n = 0; n < outcnt; n++)
ch = *out++ = *in++;
- c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
- }
- crc = c;
+
bytes_out += (ulg)outcnt;
output_ptr += (ulg)outcnt;
outcnt = 0;
@@ -139,7 +136,6 @@ void decompress_kernel(void)
free_mem_ptr = (unsigned long)&_end;
free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;

- makecrc();
puts("Uncompressing Linux... ");
gunzip();
puts("Ok, booting the kernel.\n");
Index: 2.6.14/arch/sh64/boot/compressed/misc.c
===================================================================
--- 2.6.14.orig/arch/sh64/boot/compressed/misc.c 2005-10-28 22:04:13.000000000 -0700
+++ 2.6.14/arch/sh64/boot/compressed/misc.c 2005-10-28 22:04:15.000000000 -0700
@@ -78,22 +78,19 @@ static int fill_inbuf(void)
}

/* ===========================================================================
- * Write the output window window[0..outcnt-1] and update crc and bytes_out.
+ * Write the output window window[0..outcnt-1] and update bytes_out.
* (Used for the decompressed data only.)
*/
static void flush_window(void)
{
- ulg c = crc; /* temporary variable */
unsigned n;
uch *in, *out, ch;

in = window;
out = &output_data[output_ptr];
- for (n = 0; n < outcnt; n++) {
+ for (n = 0; n < outcnt; n++)
ch = *out++ = *in++;
- c = crc_32_tab[((int) c ^ ch) & 0xff] ^ (c >> 8);
- }
- crc = c;
+
bytes_out += (ulg) outcnt;
output_ptr += (ulg) outcnt;
outcnt = 0;
@@ -119,7 +116,6 @@ void decompress_kernel(void)
free_mem_ptr = (unsigned long) &_end;
free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;

- makecrc();
puts("Uncompressing Linux... ");
cache_control(CACHE_ENABLE);
gunzip();
Index: 2.6.14/arch/x86_64/boot/compressed/misc.c
===================================================================
--- 2.6.14.orig/arch/x86_64/boot/compressed/misc.c 2005-10-28 22:04:13.000000000 -0700
+++ 2.6.14/arch/x86_64/boot/compressed/misc.c 2005-10-28 22:04:15.000000000 -0700
@@ -139,22 +139,19 @@ static int fill_inbuf(void)
}

/* ===========================================================================
- * Write the output window window[0..outcnt-1] and update crc and bytes_out.
+ * Write the output window window[0..outcnt-1] and update bytes_out.
* (Used for the decompressed data only.)
*/
static void flush_window_low(void)
{
- ulg c = crc; /* temporary variable */
unsigned n;
uch *in, *out, ch;
-
+
in = window;
- out = &output_data[output_ptr];
- for (n = 0; n < outcnt; n++) {
+ out = &output_data[output_ptr];
+ for (n = 0; n < outcnt; n++)
ch = *out++ = *in++;
- c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
- }
- crc = c;
+
bytes_out += (ulg)outcnt;
output_ptr += (ulg)outcnt;
outcnt = 0;
@@ -162,16 +159,14 @@ static void flush_window_low(void)

static void flush_window_high(void)
{
- ulg c = crc; /* temporary variable */
unsigned n;
uch *in, ch;
in = window;
for (n = 0; n < outcnt; n++) {
ch = *output_data++ = *in++;
if ((ulg)output_data == low_buffer_end) output_data=high_buffer_start;
- c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
}
- crc = c;
+
bytes_out += (ulg)outcnt;
outcnt = 0;
}
@@ -259,7 +254,6 @@ int decompress_kernel(struct moveparams
if (free_mem_ptr < 0x100000) setup_normal_output_buffer();
else setup_output_buffer_if_we_run_high(mv);

- makecrc();
putstr(".\nDecompressing Linux...");
gunzip();
putstr("done.\nBooting the kernel.\n");
Index: 2.6.14/init/do_mounts_rd.c
===================================================================
--- 2.6.14.orig/init/do_mounts_rd.c 2005-10-28 22:04:13.000000000 -0700
+++ 2.6.14/init/do_mounts_rd.c 2005-10-28 22:04:15.000000000 -0700
@@ -325,15 +325,14 @@ static int __init fill_inbuf(void)
}

/* ===========================================================================
- * Write the output window window[0..outcnt-1] and update crc and bytes_out.
+ * Write the output window window[0..outcnt-1] and update bytes_out.
* (Used for the decompressed data only.)
*/
static void __init flush_window(void)
{
- ulg c = crc; /* temporary variable */
unsigned n, written;
uch *in, ch;
-
+
written = sys_write(crd_outfd, window, outcnt);
if (written != outcnt && unzip_error == 0) {
printk(KERN_ERR "RAMDISK: incomplete write (%d != %d) %ld\n",
@@ -341,11 +340,9 @@ static void __init flush_window(void)
unzip_error = 1;
}
in = window;
- for (n = 0; n < outcnt; n++) {
+ for (n = 0; n < outcnt; n++)
ch = *in++;
- c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
- }
- crc = c;
+
bytes_out += (ulg)outcnt;
outcnt = 0;
}
@@ -366,7 +363,6 @@ static int __init crd_load(int in_fd, in
outcnt = 0; /* bytes in output buffer */
exit_code = 0;
bytes_out = 0;
- crc = (ulg)0xffffffffL; /* shift register contents */

crd_infd = in_fd;
crd_outfd = out_fd;
@@ -381,7 +377,6 @@ static int __init crd_load(int in_fd, in
kfree(inbuf);
return -1;
}
- makecrc();
result = gunzip();
if (unzip_error)
result = 1;
Index: 2.6.14/init/initramfs.c
===================================================================
--- 2.6.14.orig/init/initramfs.c 2005-10-28 22:04:13.000000000 -0700
+++ 2.6.14/init/initramfs.c 2005-10-28 22:04:15.000000000 -0700
@@ -360,22 +360,19 @@ static void __init error(char *m);
#include "../lib/inflate.c"

/* ===========================================================================
- * Write the output window window[0..outcnt-1] and update crc and bytes_out.
+ * Write the output window window[0..outcnt-1] and update bytes_out.
* (Used for the decompressed data only.)
*/
static void __init flush_window(void)
{
- ulg c = crc; /* temporary variable */
unsigned n;
uch *in, ch;

flush_buffer(window, outcnt);
in = window;
- for (n = 0; n < outcnt; n++) {
+ for (n = 0; n < outcnt; n++)
ch = *in++;
- c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
- }
- crc = c;
+
bytes_out += (ulg)outcnt;
outcnt = 0;
}
@@ -414,8 +411,6 @@ static char * __init unpack_to_rootfs(ch
inptr = 0;
outcnt = 0; /* bytes in output buffer */
bytes_out = 0;
- crc = (ulg)0xffffffffL; /* shift register contents */
- makecrc();
gunzip();
if (state != Reset)
error("junk in gzipped archive");
Index: 2.6.14/lib/inflate.c
===================================================================
--- 2.6.14.orig/lib/inflate.c 2005-10-28 22:04:13.000000000 -0700
+++ 2.6.14/lib/inflate.c 2005-10-28 22:04:15.000000000 -0700
@@ -150,7 +150,6 @@ static void free(void *where)
#endif

static u32 crc_32_tab[256];
-static u32 crc; /* dummy var until users get cleaned up */
#define CRCPOLY_LE 0xedb88320

/* Huffman code lookup table entry--this entry is four bytes for machines
@@ -993,6 +992,8 @@ static int INIT gunzip(void)
io.opos = io.bits = io.buf = 0;
io.crc = 0xffffffffUL;

+ makecrc(); /* initialize the CRC table */
+
magic[0] = get_byte();
magic[1] = get_byte();
method = get_byte();
-
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