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103 lines
2.0 KiB
C
103 lines
2.0 KiB
C
/*
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*
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* (c) 2004 Laurent Vivier <LaurentVivier@wanadoo.fr>
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*
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*/
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#include <stdio.h>
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#include <malloc.h>
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#include "console.h"
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#include "uncompress.h"
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#include "misc.h"
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extern char _kernel_start;
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extern char _kernel_end;
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/*
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* gzip declarations
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*/
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#define OF(args) args
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typedef unsigned char uch;
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typedef unsigned short ush;
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typedef unsigned long ulg;
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#define WSIZE 0x8000 /* Window size must be at least 32k, */
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/* and a power of two */
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static long bytes_out = 0;
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static uch *inbuf = 0; /* input buffer */
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static uch window[WSIZE] = { 0 }; /* Sliding window buffer */
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static unsigned insize = 0; /* valid bytes in inbuf */
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static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
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static unsigned outcnt = 0; /* bytes in output buffer */
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#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
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static uch *output_data = (uch*)0;
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static unsigned long output_ptr = 0;
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#define Assert(cond,msg)
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#define Trace(x)
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#define Tracev(x)
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#define Tracevv(x)
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#define Tracec(c,x)
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#define Tracecv(c,x)
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#define memzero(s, n) memset ((s), 0, (n))
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static int fill_inbuf(void)
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{
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inbuf = &_kernel_start;
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insize = &_kernel_end - &_kernel_start;
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inptr = 1;
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return inbuf[0];
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}
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static void gzip_mark(void **ptr)
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{
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}
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static void gzip_release(void **ptr)
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{
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}
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static void flush_window(void);
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#define STATIC
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#include "inflate.c"
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static void flush_window(void)
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{
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ulg c = crc; /* temporary variable */
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unsigned n;
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uch *in, *out, ch;
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in = window;
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out = output_data + output_ptr;
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for (n = 0; n < outcnt; n++) {
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ch = *out++ = *in++;
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c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
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}
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crc = c;
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bytes_out += (ulg)outcnt;
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output_ptr += (ulg)outcnt;
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outcnt = 0;
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console_put('.');
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}
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unsigned long uncompress(char* buf)
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{
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output_data = buf;
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makecrc();
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printf("Uncompressing kernel to %p", buf);
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gunzip();
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return (unsigned long)output_data - (unsigned long)buf;
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}
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