diff options
| -rw-r--r-- | sys/kern/imgact_gzip.c | 515 | ||||
| -rw-r--r-- | sys/kern/inflate.c | 1552 | ||||
| -rw-r--r-- | sys/sys/inflate.h | 94 |
3 files changed, 1012 insertions, 1149 deletions
diff --git a/sys/kern/imgact_gzip.c b/sys/kern/imgact_gzip.c index b18ce70..a84477e 100644 --- a/sys/kern/imgact_gzip.c +++ b/sys/kern/imgact_gzip.c @@ -1,20 +1,15 @@ /* - * Parts of this file are not covered by: * ---------------------------------------------------------------------------- * "THE BEER-WARE LICENSE" (Revision 42): - * <phk@login.dknet.dk> wrote this file. As long as you retain this notice you + * <phk@login.dkuug.dk> wrote this file. As long as you retain this notice you * can do whatever you want with this stuff. If we meet some day, and you think * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp * ---------------------------------------------------------------------------- * - * $Id: imgact_gzip.c,v 1.7 1994/10/07 22:26:51 csgr Exp $ + * $Id$ * * This module handles execution of a.out files which have been run through - * "gzip -9". - * - * For now you need to use exactly this command to compress the binaries: - * - * gzip -9 -v < /bin/sh > /tmp/sh + * "gzip". This saves diskspace, but wastes cpu-cycles and VM. * * TODO: * text-segments should be made R/O after being filled @@ -26,265 +21,351 @@ * tidy up unnecesary includes */ - -#include <sys/param.h> /* some header file needs this first foo! */ - +#include <sys/param.h> #include <sys/exec.h> #include <sys/imgact.h> #include <sys/imgact_aout.h> -#include <sys/inflate.h> #include <sys/kernel.h> -#include <sys/malloc.h> #include <sys/mman.h> #include <sys/resourcevar.h> #include <sys/sysent.h> #include <sys/systm.h> +#include <sys/inflate.h> #include <vm/vm.h> #include <vm/vm_kern.h> +struct imgact_gzip { + struct image_params *ip; + struct exec a_out; + int error; + int where; + u_char *inbuf; + u_long offset; + u_long output; + u_long len; + int idx; + u_long virtual_offset, file_offset, file_end, bss_size; +}; + +static int NextByte __P((void *vp)); +static int do_aout_hdr __P((struct imgact_gzip *)); +static int Flush __P((void *vp, u_char *, u_long siz)); + extern struct sysentvec aout_sysvec; int exec_gzip_imgact(iparams) struct image_params *iparams; { - int error,error2=0; - u_char *p = (u_char *) iparams->image_header; - struct gzip *gz; - struct gz_global gz_glbl; + int error, error2 = 0; + u_char *p = (u_char *) iparams->image_header; + struct imgact_gzip igz; + struct inflate infl; /* If these four are not OK, it isn't a gzip file */ - if (p[0] != 0x1f) return -1; /* 0 Simply magic */ - if (p[1] != 0x8b) return -1; /* 1 Simply magic */ - if (p[2] != 0x08) return -1; /* 2 Compression method */ - if (p[9] != 0x03) return -1; /* 9 OS compressed on */ - - /* If this one contains anything but a comment or a filename - * marker, we don't want to chew on it + if (p[0] != 0x1f) + return -1; /* 0 Simply magic */ + if (p[1] != 0x8b) + return -1; /* 1 Simply magic */ + if (p[2] != 0x08) + return -1; /* 2 Compression method */ + if (p[9] != 0x03) + return -1; /* 9 OS compressed on */ + + /* + * If this one contains anything but a comment or a filename marker, + * we don't want to chew on it */ - if (p[3] & ~(0x18)) return ENOEXEC; /* 3 Flags */ + if (p[3] & ~(0x18)) + return ENOEXEC; /* 3 Flags */ /* These are of no use to us */ - /* 4-7 Timestamp */ - /* 8 Extra flags */ - - gz = malloc(sizeof *gz,M_GZIP,M_NOWAIT); - if (!gz) - return ENOMEM; - bzero(gz,sizeof *gz); /* waste of time ? */ - - gz->gz_slide = malloc(WSIZE,M_TEMP,M_NOWAIT); - if (!gz->gz_slide) { - free(gz,M_GZIP); - return ENOMEM; - } - - gz->ip = iparams; - gz->error = ENOEXEC; - gz->idx = 10; - - if (p[3] & 0x08) { /* skip a filename */ - while (p[gz->idx++]) - if (gz->idx >= PAGE_SIZE) - goto done; + /* 4-7 Timestamp */ + /* 8 Extra flags */ + + bzero(&igz, sizeof igz); + bzero(&infl, sizeof infl); + infl.gz_private = (void *) &igz; + infl.gz_input = NextByte; + infl.gz_output = Flush; + + igz.ip = iparams; + igz.idx = 10; + + if (p[3] & 0x08) { /* skip a filename */ + while (p[igz.idx++]) + if (igz.idx >= PAGE_SIZE) + return ENOEXEC; } - - if (p[3] & 0x10) { /* skip a comment */ - while (p[gz->idx++]) - if (gz->idx >= PAGE_SIZE) - goto done; + if (p[3] & 0x10) { /* skip a comment */ + while (p[igz.idx++]) + if (igz.idx >= PAGE_SIZE) + return ENOEXEC; } - - gz->len = gz->ip->attr->va_size; - - gz->error = 0; + igz.len = igz.ip->attr->va_size; - error = inflate(gz, &gz_glbl); + error = inflate(&infl); - if (gz->inbuf) { - error2 = - vm_deallocate(kernel_map, (vm_offset_t)gz->inbuf, PAGE_SIZE); + if (igz.inbuf) { + error2 = + vm_deallocate(kernel_map, (vm_offset_t) igz.inbuf, + PAGE_SIZE); } - - if (gz->error || error || error2) { - printf("Output=%lu ",gz->output); - printf("Inflate_error=%d gz->error=%d error2=%d where=%d\n", - error,gz->error,error2,gz->where); - if (gz->error) - goto done; - if (error) { - gz->error = ENOEXEC; - goto done; - } - if (error2) { - gz->error = error2; - goto done; - } + if (igz.error || error || error2) { + printf("Output=%lu ", igz.output); + printf("Inflate_error=%d igz.error=%d error2=%d where=%d\n", + error, igz.error, error2, igz.where); } - - done: - error = gz->error; - free(gz->gz_slide,M_TEMP); - free(gz,M_GZIP); - return error; + if (igz.error) + return igz.error; + if (error) + return ENOEXEC; + if (error2) + return error2; + return 0; } -int -do_aout_hdr(struct gzip *gz) +static int +do_aout_hdr(struct imgact_gzip * gz) { - int error; - struct vmspace *vmspace = gz->ip->proc->p_vmspace; - u_long vmaddr; - - /* - * Set file/virtual offset based on a.out variant. - * We do two cases: host byte order and network byte order - * (for NetBSD compatibility) - */ - switch ((int)(gz->a_out.a_magic & 0xffff)) { - case ZMAGIC: - gz->virtual_offset = 0; - if (gz->a_out.a_text) { - gz->file_offset = NBPG; - } else { - /* Bill's "screwball mode" */ - gz->file_offset = 0; - } - break; - case QMAGIC: - gz->virtual_offset = NBPG; - gz->file_offset = 0; - break; - default: - /* NetBSD compatibility */ - switch ((int)(ntohl(gz->a_out.a_magic) & 0xffff)) { + int error; + struct vmspace *vmspace = gz->ip->proc->p_vmspace; + u_long vmaddr; + + /* + * Set file/virtual offset based on a.out variant. We do two cases: + * host byte order and network byte order (for NetBSD compatibility) + */ + switch ((int) (gz->a_out.a_magic & 0xffff)) { case ZMAGIC: + gz->virtual_offset = 0; + if (gz->a_out.a_text) { + gz->file_offset = NBPG; + } else { + /* Bill's "screwball mode" */ + gz->file_offset = 0; + } + break; case QMAGIC: - gz->virtual_offset = NBPG; - gz->file_offset = 0; - break; + gz->virtual_offset = NBPG; + gz->file_offset = 0; + break; default: - gz->where = __LINE__; - return (-1); + /* NetBSD compatibility */ + switch ((int) (ntohl(gz->a_out.a_magic) & 0xffff)) { + case ZMAGIC: + case QMAGIC: + gz->virtual_offset = NBPG; + gz->file_offset = 0; + break; + default: + gz->where = __LINE__; + return (-1); + } } - } - gz->bss_size = roundup(gz->a_out.a_bss, NBPG); + gz->bss_size = roundup(gz->a_out.a_bss, NBPG); - /* - * Check various fields in header for validity/bounds. - */ - if (/* entry point must lay with text region */ - gz->a_out.a_entry < gz->virtual_offset || - gz->a_out.a_entry >= gz->virtual_offset + gz->a_out.a_text || + /* + * Check various fields in header for validity/bounds. + */ + if ( /* entry point must lay with text region */ + gz->a_out.a_entry < gz->virtual_offset || + gz->a_out.a_entry >= gz->virtual_offset + gz->a_out.a_text || /* text and data size must each be page rounded */ - gz->a_out.a_text % NBPG || - gz->a_out.a_data % NBPG) { - gz->where = __LINE__; - return (-1); - } - - /* - * text/data/bss must not exceed limits - */ - if (/* text can't exceed maximum text size */ - gz->a_out.a_text > MAXTSIZ || + gz->a_out.a_text % NBPG || + gz->a_out.a_data % NBPG) { + gz->where = __LINE__; + return (-1); + } + /* + * text/data/bss must not exceed limits + */ + if ( /* text can't exceed maximum text size */ + gz->a_out.a_text > MAXTSIZ || /* data + bss can't exceed maximum data size */ - gz->a_out.a_data + gz->bss_size > MAXDSIZ || + gz->a_out.a_data + gz->bss_size > MAXDSIZ || /* data + bss can't exceed rlimit */ - gz->a_out.a_data + gz->bss_size > + gz->a_out.a_data + gz->bss_size > gz->ip->proc->p_rlimit[RLIMIT_DATA].rlim_cur) { - gz->where = __LINE__; - return (ENOMEM); - } - - /* Find out how far we should go */ - gz->file_end = gz->file_offset + gz->a_out.a_text + gz->a_out.a_data; - - /* copy in arguments and/or environment from old process */ - error = exec_extract_strings(gz->ip); - if (error) { - gz->where = __LINE__; - return (error); - } - - /* - * Destroy old process VM and create a new one (with a new stack) - */ - exec_new_vmspace(gz->ip); - - vmaddr = gz->virtual_offset; - - error = vm_mmap(&vmspace->vm_map, /* map */ - &vmaddr, /* address */ - gz->a_out.a_text, /* size */ - VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE, /* protection */ - VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE, - MAP_ANON | MAP_FIXED, /* flags */ - 0, /* vnode */ - 0); /* offset */ - - if (error) { - gz->where = __LINE__; - return (error); - } - - vmaddr = gz->virtual_offset + gz->a_out.a_text; - - /* - * Map data read/write (if text is 0, assume text is in data area - * [Bill's screwball mode]) - */ - - error = vm_mmap(&vmspace->vm_map, - &vmaddr, - gz->a_out.a_data, - VM_PROT_READ | VM_PROT_WRITE | (gz->a_out.a_text ? 0 : VM_PROT_EXECUTE), - VM_PROT_ALL, MAP_ANON | MAP_FIXED, - 0, - 0); - - if (error) { - gz->where = __LINE__; - return (error); - } - - /* - * Allocate demand-zeroed area for uninitialized data - * "bss" = 'block started by symbol' - named after the IBM 7090 - * instruction of the same name. - */ - vmaddr = gz->virtual_offset + gz->a_out.a_text + gz->a_out.a_data; - error = vm_allocate(&vmspace->vm_map, &vmaddr, gz->bss_size, FALSE); - if (error) { - gz->where = __LINE__; - return (error); - } - - /* Fill in process VM information */ - vmspace->vm_tsize = gz->a_out.a_text >> PAGE_SHIFT; - vmspace->vm_dsize = (gz->a_out.a_data + gz->bss_size) >> PAGE_SHIFT; - vmspace->vm_taddr = (caddr_t) gz->virtual_offset; - vmspace->vm_daddr = (caddr_t) gz->virtual_offset + gz->a_out.a_text; - - /* Fill in image_params */ - gz->ip->interpreted = 0; - gz->ip->entry_addr = gz->a_out.a_entry; - - gz->ip->proc->p_sysent = &aout_sysvec; - - return 0; + gz->where = __LINE__; + return (ENOMEM); + } + /* Find out how far we should go */ + gz->file_end = gz->file_offset + gz->a_out.a_text + gz->a_out.a_data; + + /* copy in arguments and/or environment from old process */ + error = exec_extract_strings(gz->ip); + if (error) { + gz->where = __LINE__; + return (error); + } + /* + * Destroy old process VM and create a new one (with a new stack) + */ + exec_new_vmspace(gz->ip); + + vmaddr = gz->virtual_offset; + + error = vm_mmap(&vmspace->vm_map, /* map */ + &vmaddr,/* address */ + gz->a_out.a_text, /* size */ + VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE, /* protection */ + VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE, + MAP_ANON | MAP_FIXED, /* flags */ + 0, /* vnode */ + 0); /* offset */ + + if (error) { + gz->where = __LINE__; + return (error); + } + vmaddr = gz->virtual_offset + gz->a_out.a_text; + + /* + * Map data read/write (if text is 0, assume text is in data area + * [Bill's screwball mode]) + */ + + error = vm_mmap(&vmspace->vm_map, + &vmaddr, + gz->a_out.a_data, + VM_PROT_READ | VM_PROT_WRITE | (gz->a_out.a_text ? 0 : VM_PROT_EXECUTE), + VM_PROT_ALL, MAP_ANON | MAP_FIXED, + 0, + 0); + + if (error) { + gz->where = __LINE__; + return (error); + } + /* + * Allocate demand-zeroed area for uninitialized data "bss" = 'block + * started by symbol' - named after the IBM 7090 instruction of the + * same name. + */ + vmaddr = gz->virtual_offset + gz->a_out.a_text + gz->a_out.a_data; + error = vm_allocate(&vmspace->vm_map, &vmaddr, gz->bss_size, FALSE); + if (error) { + gz->where = __LINE__; + return (error); + } + /* Fill in process VM information */ + vmspace->vm_tsize = gz->a_out.a_text >> PAGE_SHIFT; + vmspace->vm_dsize = (gz->a_out.a_data + gz->bss_size) >> PAGE_SHIFT; + vmspace->vm_taddr = (caddr_t) gz->virtual_offset; + vmspace->vm_daddr = (caddr_t) gz->virtual_offset + gz->a_out.a_text; + + /* Fill in image_params */ + gz->ip->interpreted = 0; + gz->ip->entry_addr = gz->a_out.a_entry; + + gz->ip->proc->p_sysent = &aout_sysvec; + + return 0; +} + +static int +NextByte(void *vp) +{ + int error; + struct imgact_gzip *igz = (struct imgact_gzip *) vp; + + if (igz->idx >= igz->len) { + igz->where = __LINE__; + return GZ_EOF; + } + if (igz->inbuf && igz->idx < (igz->offset + PAGE_SIZE)) { + return igz->inbuf[(igz->idx++) - igz->offset]; + } + if (igz->inbuf) { + error = vm_deallocate(kernel_map, + (vm_offset_t) igz->inbuf, PAGE_SIZE); + if (error) { + igz->where = __LINE__; + igz->error = error; + return GZ_EOF; + } + } + igz->offset += PAGE_SIZE; + + error = vm_mmap(kernel_map, /* map */ + (vm_offset_t *) & igz->inbuf, /* address */ + PAGE_SIZE, /* size */ + VM_PROT_READ, /* protection */ + VM_PROT_READ, /* max protection */ + 0, /* flags */ + (caddr_t) igz->ip->vnodep, /* vnode */ + igz->offset); /* offset */ + if (error) { + igz->where = __LINE__; + igz->error = error; + return GZ_EOF; + } + return igz->inbuf[(igz->idx++) - igz->offset]; } +static int +Flush(void *vp, u_char * ptr, u_long siz) +{ + struct imgact_gzip *gz = (struct imgact_gzip *) vp; + u_char *p = ptr, *q; + int i; + + /* First, find a a.out-header */ + if (gz->output < sizeof gz->a_out) { + q = (u_char *) & gz->a_out; + i = min(siz, sizeof gz->a_out - gz->output); + bcopy(p, q + gz->output, i); + gz->output += i; + p += i; + siz -= i; + if (gz->output == sizeof gz->a_out) { + i = do_aout_hdr(gz); + if (i == -1) { + gz->where = __LINE__; + gz->error = ENOEXEC; + return ENOEXEC; + } else if (i) { + gz->where = __LINE__; + gz->error = i; + return ENOEXEC; + } + if (gz->file_offset < sizeof gz->a_out) { + q = (u_char *) gz->virtual_offset + gz->output - gz->file_offset; + bcopy(&gz->a_out, q, sizeof gz->a_out - gz->file_offset); + } + } + } + /* Skip over zero-padded first PAGE if needed */ + if (gz->output < gz->file_offset && (gz->output + siz) > gz->file_offset) { + i = min(siz, gz->file_offset - gz->output); + gz->output += i; + p += i; + siz -= i; + } + if (gz->output >= gz->file_offset && gz->output < gz->file_end) { + i = min(siz, gz->file_end - gz->output); + q = (u_char *) gz->virtual_offset + gz->output - gz->file_offset; + bcopy(p, q, i); + gz->output += i; + p += i; + siz -= i; + } + gz->output += siz; + return 0; +} + + /* * Tell kern_execve.c about it, with a little help from the linker. * Since `const' objects end up in the text segment, TEXT_SET is the * correct directive to use. */ -static const struct execsw gzip_execsw = { exec_gzip_imgact, "gzip" }; -TEXT_SET(execsw_set, gzip_execsw); +static const struct execsw gzip_execsw = {exec_gzip_imgact, "gzip"}; +TEXT_SET(execsw_set, gzip_execsw); diff --git a/sys/kern/inflate.c b/sys/kern/inflate.c index 4f7acf9..a15c347 100644 --- a/sys/kern/inflate.c +++ b/sys/kern/inflate.c @@ -1,5 +1,5 @@ /* - * Parts of this file are not covered by: + * Most parts of this file are not covered by: * ---------------------------------------------------------------------------- * "THE BEER-WARE LICENSE" (Revision 42): * <phk@login.dknet.dk> wrote this file. As long as you retain this notice you @@ -7,156 +7,42 @@ * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp * ---------------------------------------------------------------------------- * - * $Id: inflate.c,v 1.2 1994/10/07 23:18:09 csgr Exp $ + * $Id: inflate.c,v 1.3 1994/10/11 11:29:11 csgr Exp $ * - * This module handles execution of a.out files which have been run through - * "gzip -9". * - * For now you need to use exactly this command to compress the binaries: - * - * gzip -9 -v < /bin/sh > /tmp/sh - * - * TODO: - * text-segments should be made R/O after being filled - * is the vm-stuff safe ? - * should handle the entire header of gzip'ed stuff. - * inflate isn't quite reentrant yet... - * error-handling is a mess... - * so is the rest... */ #include <sys/param.h> -#include <sys/systm.h> #include <sys/inflate.h> +#include <sys/systm.h> #include <sys/mman.h> #include <sys/malloc.h> #include <vm/vm.h> #include <vm/vm_kern.h> +/* needed to make inflate() work */ +#define uch u_char +#define ush u_short +#define ulg u_long + /* Stuff to make inflate() work */ -# define memzero(dest,len) bzero(dest,len) -# define NOMEMCPY +#define memzero(dest,len) bzero(dest,len) +#define NOMEMCPY #define FPRINTF printf -#define EOF -1 -#define CHECK_EOF -static int -NextByte(struct gzip *gz) -{ - int error; - - if(gz->idx >= gz->len) { - gz->where = __LINE__; - return EOF; +#define FLUSH(x,y) { \ + int foo = (*x->gz_output)(x->gz_private,x->gz_slide,y); \ + if (foo) \ + return foo; \ } - if((!gz->inbuf) || gz->idx >= (gz->offset+PAGE_SIZE)) { - if(gz->inbuf) { - error = vm_deallocate(kernel_map, - (vm_offset_t)gz->inbuf, PAGE_SIZE); - if(error) { - gz->where = __LINE__; - gz->error = error; - return EOF; - } - } - - gz->offset += PAGE_SIZE; - - error = vm_mmap(kernel_map, /* map */ - (vm_offset_t *)&gz->inbuf, /* address */ - PAGE_SIZE, /* size */ - VM_PROT_READ, /* protection */ - VM_PROT_READ, /* max protection */ - 0, /* flags */ - (caddr_t)gz->ip->vnodep, /* vnode */ - gz->offset); /* offset */ - if(error) { - gz->where = __LINE__; - gz->error = error; - return EOF; - } - - } - return gz->inbuf[(gz->idx++) - gz->offset]; -} - -#define NEXTBYTE NextByte(gz) - -static int -Flush(struct gzip *gz,u_long siz) -{ - u_char *p = slide,*q; - int i; - - /* First, find a a.out-header */ - if(gz->output < sizeof gz->a_out) { - q = (u_char*) &gz->a_out; - i = min(siz,sizeof gz->a_out - gz->output); - bcopy(p,q+gz->output,i); - gz->output += i; - p += i; - siz -= i; - if(gz->output == sizeof gz->a_out) { - i = do_aout_hdr(gz); - if (i == -1) { - gz->where = __LINE__; - gz->error = ENOEXEC; - return ENOEXEC; - } else if (i) { - gz->where = __LINE__; - gz->error = i; - return ENOEXEC; - } - if(gz->file_offset < sizeof gz->a_out) { - q = (u_char*) gz->virtual_offset + gz->output - gz->file_offset; - bcopy(&gz->a_out,q,sizeof gz->a_out - gz->file_offset); - } - } - } - /* Skip over zero-padded first PAGE if needed */ - if(gz->output < gz->file_offset && (gz->output+siz) > gz->file_offset) { - i = min(siz, gz->file_offset - gz->output); - gz->output += i; - p += i; - siz -= i; - } - if(gz->output >= gz->file_offset && gz->output < gz->file_end) { - i = min(siz, gz->file_end - gz->output); - q = (u_char*) gz->virtual_offset + gz->output - gz->file_offset; - bcopy(p,q,i); - gz->output += i; - p += i; - siz -= i; - } - gz->output += siz; - return 0; -} - -#define FLUSH(x,y) {int foo = Flush(x,y); if (foo) return foo;} -static -void * -myalloc(u_long size) -{ - return malloc(size, M_GZIP, M_NOWAIT); -} -#define malloc myalloc - -static -void -myfree(void * ptr) -{ - free(ptr,M_GZIP); -} -#define free myfree - static const int qflag = 0; -#define Trace(x) /* */ - -/* This came from unzip-5.12. I have changed it to pass a "gz" pointer - * around, thus hopefully making it re-entrant. Poul-Henningi +/* + * This came from unzip-5.12. I have changed it the flow to pass + * a structure pointer around, thus hopefully making it re-entrant. + * Poul-Henning */ /* inflate.c -- put in the public domain by Mark Adler @@ -195,7 +81,7 @@ static const int qflag = 0; three). c4 15 Apr 92 M. Adler added NOMEMCPY do kill use of memcpy(). worked around a Turbo C optimization bug. - c5 21 Apr 92 M. Adler added the WSIZE #define to allow reducing + c5 21 Apr 92 M. Adler added the GZ_WSIZE #define to allow reducing the 32K window size for specialized applications. c6 31 May 92 M. Adler added some typecasts to eliminate warnings @@ -225,9 +111,9 @@ static const int qflag = 0; c14g 28 Oct 93 G. Roelofs changed l/(lx+1) macro to pointer (Cray bug) c14h 7 Dec 93 C. Ghisler huft_build() optimizations. c14i 9 Jan 94 A. Verheijen set fixed_t{d,l} to NULL after freeing; - G. Roelofs check NEXTBYTE macro for EOF. + G. Roelofs check NEXTBYTE macro for GZ_EOF. c14j 23 Jan 94 G. Roelofs removed Ghisler "optimizations"; ifdef'd - EOF check. + GZ_EOF check. c14k 27 Feb 94 G. Roelofs added some typecasts to avoid warnings. c14l 9 Apr 94 G. Roelofs fixed split comments on preprocessor lines to avoid bug in Encore compiler. @@ -275,7 +161,7 @@ static const int qflag = 0; chunks); otherwise the dynamic method is used. In the latter case, the codes are customized to the probabilities in the current block and so can code it much better than the pre-determined fixed codes can. - + The Huffman codes themselves are decoded using a mutli-level table lookup, in order to maximize the speed of decoding plus the speed of building the decoding tables. See the comments below that precede the @@ -329,12 +215,12 @@ static const int qflag = 0; */ -#define PKZIP_BUG_WORKAROUND /* PKZIP 1.93a problem--live with it */ +#define PKZIP_BUG_WORKAROUND /* PKZIP 1.93a problem--live with it */ /* - inflate.h must supply the uch slide[WSIZE] array and the NEXTBYTE, + inflate.h must supply the uch slide[GZ_WSIZE] array and the NEXTBYTE, FLUSH() and memzero macros. If the window size is not 32K, it - should also define WSIZE. If INFMOD is defined, it can include + should also define GZ_WSIZE. If INFMOD is defined, it can include compiled functions to support the NEXTBYTE and/or FLUSH() macros. There are defaults for NEXTBYTE and FLUSH() below for use as examples of what those functions need to do. Normally, you would @@ -349,7 +235,8 @@ static const int qflag = 0; probably memset() or bzero() in the memzero() macro). Their prototypes are normally found in <string.h> and <stdlib.h>. */ -#define INFMOD /* tell inflate.h to include code to be compiled */ +#define INFMOD /* tell inflate.h to include code to be + * compiled */ /* Huffman code lookup table entry--this entry is four bytes for machines that have 16-bit pointers (e.g. PC's in the small or medium model). @@ -359,36 +246,25 @@ static const int qflag = 0; an unused code. If a code with e == 99 is looked up, this implies an error in the data. */ struct huft { - uch e; /* number of extra bits or operation */ - uch b; /* number of bits in this code or subcode */ - union { - ush n; /* literal, length base, or distance base */ - struct huft *t; /* pointer to next level of table */ - } v; + uch e; /* number of extra bits or operation */ + uch b; /* number of bits in this code or subcode */ + union { + ush n; /* literal, length base, or distance + * base */ + struct huft *t; /* pointer to next level of table */ + } v; }; /* Function prototypes */ -#ifndef OF -# ifdef __STDC__ -# define OF(a) a -# else /* !__STDC__ */ -# define OF(a) () -# endif /* ?__STDC__ */ -#endif -static int huft_build OF((struct gzip *,unsigned *, unsigned, unsigned, const ush *, const ush *, struct huft **, int *, struct gz_global *)); -static int huft_free OF((struct gzip *,struct huft *)); -static int inflate_codes OF((struct gzip *,struct huft *, struct huft *, int, int, struct gz_global *)); -static int inflate_stored OF((struct gzip *, struct gz_global *)); -static int inflate_fixed OF((struct gzip *, struct gz_global *)); -static int inflate_dynamic OF((struct gzip *, struct gz_global *)); -static int inflate_block OF((struct gzip *,int *, struct gz_global *)); - -#if 0 -/* never used - why not ? */ -static int inflate_free OF((struct gzip *, struct gz_global *)); -#endif - +static int huft_build __P((struct inflate *, unsigned *, unsigned, unsigned, const ush *, const ush *, struct huft **, int *)); +static int huft_free __P((struct inflate *, struct huft *)); +static int inflate_codes __P((struct inflate *, struct huft *, struct huft *, int, int)); +static int inflate_stored __P((struct inflate *)); +static int xinflate __P((struct inflate *)); +static int inflate_fixed __P((struct inflate *)); +static int inflate_dynamic __P((struct inflate *)); +static int inflate_block __P((struct inflate *, int *)); /* The inflate algorithm uses a sliding 32K byte window on the uncompressed stream to find repeated byte strings. This is implemented here as a @@ -401,36 +277,42 @@ static int inflate_free OF((struct gzip *, struct gz_global *)); /* Tables for deflate from PKZIP's appnote.txt. */ -static const unsigned border[] = { /* Order of the bit length code lengths */ - 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; -static const ush cplens[] = { /* Copy lengths for literal codes 257..285 */ - 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, - 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0}; - /* note: see note #13 above about the 258 in this list. */ -static const ush cplext[] = { /* Extra bits for literal codes 257..285 */ - 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, - 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 99, 99}; /* 99==invalid */ -static const ush cpdist[] = { /* Copy offsets for distance codes 0..29 */ - 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, - 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, - 8193, 12289, 16385, 24577}; -static const ush cpdext[] = { /* Extra bits for distance codes */ - 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, - 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, - 12, 12, 13, 13}; + +/* Order of the bit length code lengths */ +static const unsigned border[] = { + 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; + +static const ush cplens[] = { /* Copy lengths for literal codes 257..285 */ + 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, + 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0}; + /* note: see note #13 above about the 258 in this list. */ + +static const ush cplext[] = { /* Extra bits for literal codes 257..285 */ + 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, + 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 99, 99}; /* 99==invalid */ + +static const ush cpdist[] = { /* Copy offsets for distance codes 0..29 */ + 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, + 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, + 8193, 12289, 16385, 24577}; + +static const ush cpdext[] = { /* Extra bits for distance codes */ + 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, + 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, + 12, 12, 13, 13}; /* And'ing with mask[n] masks the lower n bits */ static const ush mask[] = { - 0x0000, - 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff, - 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff + 0x0000, + 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff, + 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff }; /* Macros for inflate() bit peeking and grabbing. The usage is: - - NEEDBITS(j) + + NEEDBITS(glbl,j) x = b & mask[j]; DUMPBITS(j) @@ -449,21 +331,21 @@ static const ush mask[] = { /* * The following 2 were global variables. - * They are now fields of the gz_global structure. + * They are now fields of the inflate structure. */ -#define bb (glbl->gz_bb) /* bit buffer */ -#define bk (glbl->gz_bk) /* bits in bit buffer */ -#ifndef CHECK_EOF -# define NEEDBITS(n) {while(k<(n)){b|=((ulg)NEXTBYTE)<<k;k+=8;}} -#else -# define NEEDBITS(n) {while(k<(n)){int c=NEXTBYTE;if(c==EOF)return 1;\ - b|=((ulg)c)<<k;k+=8;}} -#endif /* Piet Plomp: change "return 1" to "break" */ +#define NEEDBITS(glbl,n) { \ + while(k<(n)) { \ + int c=(*glbl->gz_input)(glbl->gz_private); \ + if(c==GZ_EOF) \ + return 1; \ + b|=((ulg)c)<<k; \ + k+=8; \ + } \ + } #define DUMPBITS(n) {b>>=(n);k-=(n);} - /* Huffman code decoding is performed using a multi-level table lookup. The fastest way to decode is to simply build a lookup table whose @@ -496,31 +378,15 @@ static const ush mask[] = { possibly even between compilers. Your mileage may vary. */ - static const int lbits = 9; /* bits in base literal/length lookup table */ static const int dbits = 6; /* bits in base distance lookup table */ /* If BMAX needs to be larger than 16, then h and x[] should be ulg. */ -#define BMAX 16 /* maximum bit length of any code (16 for explode) */ -#define N_MAX 288 /* maximum number of codes in any set */ +#define BMAX 16 /* maximum bit length of any code (16 for + * explode) */ +#define N_MAX 288 /* maximum number of codes in any set */ -/* - * This also used to be a global variable - */ -#define hufts (glbl->gz_hufts) - - -static int huft_build(gz,b, n, s, d, e, t, m, glbl) -struct gzip *gz; -unsigned *b; /* code lengths in bits (all assumed <= BMAX) */ -unsigned n; /* number of codes (assumed <= N_MAX) */ -unsigned s; /* number of simple-valued codes (0..s-1) */ -const ush *d; /* list of base values for non-simple codes */ -const ush *e; /* list of extra bits for non-simple codes */ -struct huft **t; /* result: starting table */ -int *m; /* maximum lookup bits, returns actual */ -struct gz_global * glbl; /* Given a list of code lengths and a maximum table size, make a set of tables to decode that set of codes. Return zero on success, one if the given code set is incomplete (the tables are still built in this @@ -529,712 +395,660 @@ struct gz_global * glbl; The code with value 256 is special, and the tables are constructed so that no bits beyond that code are fetched when that code is decoded. */ +static int +huft_build(glbl, b, n, s, d, e, t, m) + struct inflate *glbl; + unsigned *b; /* code lengths in bits (all assumed <= BMAX) */ + unsigned n; /* number of codes (assumed <= N_MAX) */ + unsigned s; /* number of simple-valued codes (0..s-1) */ + const ush *d; /* list of base values for non-simple codes */ + const ush *e; /* list of extra bits for non-simple codes */ + struct huft **t; /* result: starting table */ + int *m; /* maximum lookup bits, returns actual */ { - unsigned a; /* counter for codes of length k */ - unsigned c[BMAX+1]; /* bit length count table */ - unsigned el; /* length of EOB code (value 256) */ - unsigned f; /* i repeats in table every f entries */ - int g; /* maximum code length */ - int h; /* table level */ - register unsigned i; /* counter, current code */ - register unsigned j; /* counter */ - register int k; /* number of bits in current code */ - int lx[BMAX+1]; /* memory for l[-1..BMAX-1] */ - int *l = lx+1; /* stack of bits per table */ - register unsigned *p; /* pointer into c[], b[], or v[] */ - register struct huft *q; /* points to current table */ - struct huft r; /* table entry for structure assignment */ - struct huft *u[BMAX]; /* table stack */ - unsigned v[N_MAX]; /* values in order of bit length */ - register int w; /* bits before this table == (l * h) */ - unsigned x[BMAX+1]; /* bit offsets, then code stack */ - unsigned *xp; /* pointer into x */ - int y; /* number of dummy codes added */ - unsigned z; /* number of entries in current table */ - - - /* Generate counts for each bit length */ - el = n > 256 ? b[256] : BMAX; /* set length of EOB code, if any */ - memzero((char *)c, sizeof(c)); - p = b; i = n; - do { - c[*p]++; p++; /* assume all entries <= BMAX */ - } while (--i); - if (c[0] == n) /* null input--all zero length codes */ - { - *t = (struct huft *)NULL; - *m = 0; - return 0; - } - - - /* Find minimum and maximum length, bound *m by those */ - for (j = 1; j <= BMAX; j++) - if (c[j]) - break; - k = j; /* minimum code length */ - if ((unsigned)*m < j) - *m = j; - for (i = BMAX; i; i--) - if (c[i]) - break; - g = i; /* maximum code length */ - if ((unsigned)*m > i) - *m = i; - - - /* Adjust last length count to fill out codes, if needed */ - for (y = 1 << j; j < i; j++, y <<= 1) - if ((y -= c[j]) < 0) - return 2; /* bad input: more codes than bits */ - if ((y -= c[i]) < 0) - return 2; - c[i] += y; - - - /* Generate starting offsets into the value table for each length */ - x[1] = j = 0; - p = c + 1; xp = x + 2; - while (--i) { /* note that i == g from above */ - *xp++ = (j += *p++); - } - - - /* Make a table of values in order of bit lengths */ - p = b; i = 0; - do { - if ((j = *p++) != 0) - v[x[j]++] = i; - } while (++i < n); - - - /* Generate the Huffman codes and for each, make the table entries */ - x[0] = i = 0; /* first Huffman code is zero */ - p = v; /* grab values in bit order */ - h = -1; /* no tables yet--level -1 */ - w = l[-1] = 0; /* no bits decoded yet */ - u[0] = (struct huft *)NULL; /* just to keep compilers happy */ - q = (struct huft *)NULL; /* ditto */ - z = 0; /* ditto */ - - /* go through the bit lengths (k already is bits in shortest code) */ - for (; k <= g; k++) - { - a = c[k]; - while (a--) - { - /* here i is the Huffman code of length k bits for value *p */ - /* make tables up to required level */ - while (k > w + l[h]) - { - w += l[h++]; /* add bits already decoded */ - - /* compute minimum size table less than or equal to *m bits */ - z = (z = g - w) > (unsigned)*m ? *m : z; /* upper limit */ - if ((f = 1 << (j = k - w)) > a + 1) /* try a k-w bit table */ - { /* too few codes for k-w bit table */ - f -= a + 1; /* deduct codes from patterns left */ - xp = c + k; - while (++j < z) /* try smaller tables up to z bits */ - { - if ((f <<= 1) <= *++xp) - break; /* enough codes to use up j bits */ - f -= *xp; /* else deduct codes from patterns */ - } - } - if ((unsigned)w + j > el && (unsigned)w < el) - j = el - w; /* make EOB code end at table */ - z = 1 << j; /* table entries for j-bit table */ - l[h] = j; /* set table size in stack */ - - /* allocate and link in new table */ - if ((q = (struct huft *)malloc((z + 1)*sizeof(struct huft))) == - (struct huft *)NULL) - { - if (h) - huft_free(gz,u[0]); - return 3; /* not enough memory */ - } - hufts += z + 1; /* track memory usage */ - *t = q + 1; /* link to list for huft_free() */ - *(t = &(q->v.t)) = (struct huft *)NULL; - u[h] = ++q; /* table starts after link */ - - /* connect to last table, if there is one */ - if (h) - { - x[h] = i; /* save pattern for backing up */ - r.b = (uch)l[h-1]; /* bits to dump before this table */ - r.e = (uch)(16 + j); /* bits in this table */ - r.v.t = q; /* pointer to this table */ - j = (i & ((1 << w) - 1)) >> (w - l[h-1]); - u[h-1][j] = r; /* connect to last table */ - } - } - - /* set up table entry in r */ - r.b = (uch)(k - w); - if (p >= v + n) - r.e = 99; /* out of values--invalid code */ - else if (*p < s) - { - r.e = (uch)(*p < 256 ? 16 : 15); /* 256 is end-of-block code */ - r.v.n = *p++; /* simple code is just the value */ - } - else - { - r.e = (uch)e[*p - s]; /* non-simple--look up in lists */ - r.v.n = d[*p++ - s]; - } - - /* fill code-like entries with r */ - f = 1 << (k - w); - for (j = i >> w; j < z; j += f) - q[j] = r; - - /* backwards increment the k-bit code i */ - for (j = 1 << (k - 1); i & j; j >>= 1) - i ^= j; - i ^= j; - - /* backup over finished tables */ - while ((i & ((1 << w) - 1)) != x[h]) - w -= l[--h]; /* don't need to update q */ - } - } - - - /* return actual size of base table */ - *m = l[0]; - - - /* Return true (1) if we were given an incomplete table */ - return y != 0 && g != 1; -} + unsigned a; /* counter for codes of length k */ + unsigned c[BMAX + 1]; /* bit length count table */ + unsigned el; /* length of EOB code (value 256) */ + unsigned f; /* i repeats in table every f entries */ + int g; /* maximum code length */ + int h; /* table level */ + register unsigned i; /* counter, current code */ + register unsigned j; /* counter */ + register int k; /* number of bits in current code */ + int lx[BMAX + 1]; /* memory for l[-1..BMAX-1] */ + int *l = lx + 1; /* stack of bits per table */ + register unsigned *p; /* pointer into c[], b[], or v[] */ + register struct huft *q;/* points to current table */ + struct huft r; /* table entry for structure assignment */ + struct huft *u[BMAX];/* table stack */ + unsigned v[N_MAX]; /* values in order of bit length */ + register int w; /* bits before this table == (l * h) */ + unsigned x[BMAX + 1]; /* bit offsets, then code stack */ + unsigned *xp; /* pointer into x */ + int y; /* number of dummy codes added */ + unsigned z; /* number of entries in current table */ + + /* Generate counts for each bit length */ + el = n > 256 ? b[256] : BMAX; /* set length of EOB code, if any */ + memzero((char *) c, sizeof(c)); + p = b; + i = n; + do { + c[*p]++; + p++; /* assume all entries <= BMAX */ + } while (--i); + if (c[0] == n) { /* null input--all zero length codes */ + *t = (struct huft *) NULL; + *m = 0; + return 0; + } + /* Find minimum and maximum length, bound *m by those */ + for (j = 1; j <= BMAX; j++) + if (c[j]) + break; + k = j; /* minimum code length */ + if ((unsigned) *m < j) + *m = j; + for (i = BMAX; i; i--) + if (c[i]) + break; + g = i; /* maximum code length */ + if ((unsigned) *m > i) + *m = i; + + /* Adjust last length count to fill out codes, if needed */ + for (y = 1 << j; j < i; j++, y <<= 1) + if ((y -= c[j]) < 0) + return 2; /* bad input: more codes than bits */ + if ((y -= c[i]) < 0) + return 2; + c[i] += y; + + /* Generate starting offsets into the value table for each length */ + x[1] = j = 0; + p = c + 1; + xp = x + 2; + while (--i) { /* note that i == g from above */ + *xp++ = (j += *p++); + } + + /* Make a table of values in order of bit lengths */ + p = b; + i = 0; + do { + if ((j = *p++) != 0) + v[x[j]++] = i; + } while (++i < n); + + /* Generate the Huffman codes and for each, make the table entries */ + x[0] = i = 0; /* first Huffman code is zero */ + p = v; /* grab values in bit order */ + h = -1; /* no tables yet--level -1 */ + w = l[-1] = 0; /* no bits decoded yet */ + u[0] = (struct huft *) NULL; /* just to keep compilers happy */ + q = (struct huft *) NULL; /* ditto */ + z = 0; /* ditto */ + + /* go through the bit lengths (k already is bits in shortest code) */ + for (; k <= g; k++) { + a = c[k]; + while (a--) { + /* + * here i is the Huffman code of length k bits for + * value *p + */ + /* make tables up to required level */ + while (k > w + l[h]) { + w += l[h++]; /* add bits already decoded */ + + /* + * compute minimum size table less than or + * equal to *m bits + */ + z = (z = g - w) > (unsigned) *m ? *m : z; /* upper limit */ + if ((f = 1 << (j = k - w)) > a + 1) { /* try a k-w bit table *//* t + * oo few codes for k-w + * bit table */ + f -= a + 1; /* deduct codes from + * patterns left */ + xp = c + k; + while (++j < z) { /* try smaller tables up + * to z bits */ + if ((f <<= 1) <= *++xp) + break; /* enough codes to use + * up j bits */ + f -= *xp; /* else deduct codes + * from patterns */ + } + } + if ((unsigned) w + j > el && (unsigned) w < el) + j = el - w; /* make EOB code end at + * table */ + z = 1 << j; /* table entries for j-bit + * table */ + l[h] = j; /* set table size in stack */ + + /* allocate and link in new table */ + if ((q = (struct huft *) malloc((z + 1) * sizeof(struct huft), M_GZIP, M_WAITOK)) == + (struct huft *) NULL) { + if (h) + huft_free(glbl, u[0]); + return 3; /* not enough memory */ + } + glbl->gz_hufts += z + 1; /* track memory usage */ + *t = q + 1; /* link to list for + * huft_free() */ + *(t = &(q->v.t)) = (struct huft *) NULL; + u[h] = ++q; /* table starts after link */ + + /* connect to last table, if there is one */ + if (h) { + x[h] = i; /* save pattern for + * backing up */ + r.b = (uch) l[h - 1]; /* bits to dump before + * this table */ + r.e = (uch) (16 + j); /* bits in this table */ + r.v.t = q; /* pointer to this table */ + j = (i & ((1 << w) - 1)) >> (w - l[h - 1]); + u[h - 1][j] = r; /* connect to last table */ + } + } + + /* set up table entry in r */ + r.b = (uch) (k - w); + if (p >= v + n) + r.e = 99; /* out of values--invalid + * code */ + else if (*p < s) { + r.e = (uch) (*p < 256 ? 16 : 15); /* 256 is end-of-block + * code */ + r.v.n = *p++; /* simple code is just the + * value */ + } else { + r.e = (uch) e[*p - s]; /* non-simple--look up + * in lists */ + r.v.n = d[*p++ - s]; + } + + /* fill code-like entries with r */ + f = 1 << (k - w); + for (j = i >> w; j < z; j += f) + q[j] = r; + + /* backwards increment the k-bit code i */ + for (j = 1 << (k - 1); i & j; j >>= 1) + i ^= j; + i ^= j; + + /* backup over finished tables */ + while ((i & ((1 << w) - 1)) != x[h]) + w -= l[--h]; /* don't need to update q */ + } + } + /* return actual size of base table */ + *m = l[0]; + /* Return true (1) if we were given an incomplete table */ + return y != 0 && g != 1; +} -static int huft_free(gz,t) -struct gzip *gz; -struct huft *t; /* table to free */ +static int +huft_free(glbl, t) + struct inflate *glbl; + struct huft *t; /* table to free */ /* Free the malloc'ed tables built by huft_build(), which makes a linked list of the tables it made, with the links in a dummy first entry of each table. */ { - register struct huft *p, *q; - - - /* Go through linked list, freeing from the malloced (t[-1]) address. */ - p = t; - while (p != (struct huft *)NULL) - { - q = (--p)->v.t; - free(p); - p = q; - } - return 0; + register struct huft *p, *q; + + /* Go through linked list, freeing from the malloced (t[-1]) address. */ + p = t; + while (p != (struct huft *) NULL) { + q = (--p)->v.t; + free(p, M_GZIP); + p = q; + } + return 0; } - - -#ifdef ASM_INFLATECODES -# define inflate_codes(tl,td,bl,bd) flate_codes(tl,td,bl,bd,(uch *)slide) - int flate_codes OF((struct huft *, struct huft *, int, int, uch *)); - -#else - -static int inflate_codes(gz,tl, td, bl, bd, glbl) -struct gzip *gz; -struct huft *tl, *td; /* literal/length and distance decoder tables */ -int bl, bd; /* number of bits decoded by tl[] and td[] */ -struct gz_global * glbl;/* global variables */ /* inflate (decompress) the codes in a deflated (compressed) block. Return an error code or zero if it all goes ok. */ +static int +inflate_codes(glbl, tl, td, bl, bd) + struct inflate *glbl; + struct huft *tl, *td;/* literal/length and distance decoder tables */ + int bl, bd; /* number of bits decoded by tl[] and td[] */ { - register unsigned e; /* table entry flag/number of extra bits */ - unsigned n, d; /* length and index for copy */ - unsigned w; /* current window position */ - struct huft *t; /* pointer to table entry */ - unsigned ml, md; /* masks for bl and bd bits */ - register ulg b; /* bit buffer */ - register unsigned k; /* number of bits in bit buffer */ - - - /* make local copies of globals */ - b = bb; /* initialize bit buffer */ - k = bk; - w = wp; /* initialize window position */ - - - /* inflate the coded data */ - ml = mask[bl]; /* precompute masks for speed */ - md = mask[bd]; - while (1) /* do until end of block */ - { - NEEDBITS((unsigned)bl) - if ((e = (t = tl + ((unsigned)b & ml))->e) > 16) - do { - if (e == 99) - return 1; - DUMPBITS(t->b) - e -= 16; - NEEDBITS(e) - } while ((e = (t = t->v.t + ((unsigned)b & mask[e]))->e) > 16); - DUMPBITS(t->b) - if (e == 16) /* then it's a literal */ - { - slide[w++] = (uch)t->v.n; - if (w == WSIZE) - { - FLUSH(gz,w); - w = 0; - } - } - else /* it's an EOB or a length */ - { - /* exit if end of block */ - if (e == 15) - break; - - /* get length of block to copy */ - NEEDBITS(e) - n = t->v.n + ((unsigned)b & mask[e]); - DUMPBITS(e); - - /* decode distance of block to copy */ - NEEDBITS((unsigned)bd) - if ((e = (t = td + ((unsigned)b & md))->e) > 16) - do { - if (e == 99) - return 1; - DUMPBITS(t->b) - e -= 16; - NEEDBITS(e) - } while ((e = (t = t->v.t + ((unsigned)b & mask[e]))->e) > 16); - DUMPBITS(t->b) - NEEDBITS(e) - d = w - t->v.n - ((unsigned)b & mask[e]); - DUMPBITS(e) - - /* do the copy */ - do { - n -= (e = (e = WSIZE - ((d &= WSIZE-1) > w ? d : w)) > n ? n : e); + register unsigned e; /* table entry flag/number of extra bits */ + unsigned n, d; /* length and index for copy */ + unsigned w; /* current window position */ + struct huft *t; /* pointer to table entry */ + unsigned ml, md; /* masks for bl and bd bits */ + register ulg b; /* bit buffer */ + register unsigned k; /* number of bits in bit buffer */ + + /* make local copies of globals */ + b = glbl->gz_bb; /* initialize bit buffer */ + k = glbl->gz_bk; + w = glbl->gz_wp; /* initialize window position */ + + /* inflate the coded data */ + ml = mask[bl]; /* precompute masks for speed */ + md = mask[bd]; + while (1) { /* do until end of block */ + NEEDBITS(glbl, (unsigned) bl) + if ((e = (t = tl + ((unsigned) b & ml))->e) > 16) + do { + if (e == 99) + return 1; + DUMPBITS(t->b) + e -= 16; + NEEDBITS(glbl, e) + } while ((e = (t = t->v.t + ((unsigned) b & mask[e]))->e) > 16); + DUMPBITS(t->b) + if (e == 16) { /* then it's a literal */ + glbl->gz_slide[w++] = (uch) t->v.n; + if (w == GZ_WSIZE) { + FLUSH(glbl, w); + w = 0; + } + } else { /* it's an EOB or a length */ + /* exit if end of block */ + if (e == 15) + break; + + /* get length of block to copy */ + NEEDBITS(glbl, e) + n = t->v.n + ((unsigned) b & mask[e]); + DUMPBITS(e); + + /* decode distance of block to copy */ + NEEDBITS(glbl, (unsigned) bd) + if ((e = (t = td + ((unsigned) b & md))->e) > 16) + do { + if (e == 99) + return 1; + DUMPBITS(t->b) + e -= 16; + NEEDBITS(glbl, e) + } while ((e = (t = t->v.t + ((unsigned) b & mask[e]))->e) > 16); + DUMPBITS(t->b) + NEEDBITS(glbl, e) + d = w - t->v.n - ((unsigned) b & mask[e]); + DUMPBITS(e) + /* do the copy */ + do { + n -= (e = (e = GZ_WSIZE - ((d &= GZ_WSIZE - 1) > w ? d : w)) > n ? n : e); #ifndef NOMEMCPY - if (w - d >= e) /* (this test assumes unsigned comparison) */ - { - memcpy(slide + w, slide + d, e); - w += e; - d += e; - } - else /* do it slow to avoid memcpy() overlap */ -#endif /* !NOMEMCPY */ - do { - slide[w++] = slide[d++]; - } while (--e); - if (w == WSIZE) - { - FLUSH(gz,w); - w = 0; - } - } while (n); - } - } - - - /* restore the globals from the locals */ - wp = w; /* restore global window pointer */ - bb = b; /* restore global bit buffer */ - bk = k; - - - /* done */ - return 0; -} - -#endif /* ASM_INFLATECODES */ + if (w - d >= e) { /* (this test assumes + * unsigned comparison) */ + memcpy(glbl->gz_slide + w, glbl->gz_slide + d, e); + w += e; + d += e; + } else /* do it slow to avoid memcpy() + * overlap */ +#endif /* !NOMEMCPY */ + do { + glbl->gz_slide[w++] = glbl->gz_slide[d++]; + } while (--e); + if (w == GZ_WSIZE) { + FLUSH(glbl, w); + w = 0; + } + } while (n); + } + } + /* restore the globals from the locals */ + glbl->gz_wp = w; /* restore global window pointer */ + glbl->gz_bb = b; /* restore global bit buffer */ + glbl->gz_bk = k; + /* done */ + return 0; +} -static int inflate_stored(gz, glbl) -struct gzip *gz; -struct gz_global * glbl; /* "decompress" an inflated type 0 (stored) block. */ +static int +inflate_stored(glbl) + struct inflate *glbl; { - unsigned n; /* number of bytes in block */ - unsigned w; /* current window position */ - register ulg b; /* bit buffer */ - register unsigned k; /* number of bits in bit buffer */ - - - /* make local copies of globals */ - Trace((stderr, "\nstored block")); - b = bb; /* initialize bit buffer */ - k = bk; - w = wp; /* initialize window position */ - - - /* go to byte boundary */ - n = k & 7; - DUMPBITS(n); - - - /* get the length and its complement */ - NEEDBITS(16) - n = ((unsigned)b & 0xffff); - DUMPBITS(16) - NEEDBITS(16) - if (n != (unsigned)((~b) & 0xffff)) - return 1; /* error in compressed data */ - DUMPBITS(16) - - - /* read and output the compressed data */ - while (n--) - { - NEEDBITS(8) - slide[w++] = (uch)b; - if (w == WSIZE) - { - FLUSH(gz,w); - w = 0; - } - DUMPBITS(8) - } - - - /* restore the globals from the locals */ - wp = w; /* restore global window pointer */ - bb = b; /* restore global bit buffer */ - bk = k; - return 0; -} - + unsigned n; /* number of bytes in block */ + unsigned w; /* current window position */ + register ulg b; /* bit buffer */ + register unsigned k; /* number of bits in bit buffer */ + + /* make local copies of globals */ + b = glbl->gz_bb; /* initialize bit buffer */ + k = glbl->gz_bk; + w = glbl->gz_wp; /* initialize window position */ + + /* go to byte boundary */ + n = k & 7; + DUMPBITS(n); + + /* get the length and its complement */ + NEEDBITS(glbl, 16) + n = ((unsigned) b & 0xffff); + DUMPBITS(16) + NEEDBITS(glbl, 16) + if (n != (unsigned) ((~b) & 0xffff)) + return 1; /* error in compressed data */ + DUMPBITS(16) + /* read and output the compressed data */ + while (n--) { + NEEDBITS(glbl, 8) + glbl->gz_slide[w++] = (uch) b; + if (w == GZ_WSIZE) { + FLUSH(glbl, w); + w = 0; + } + DUMPBITS(8) + } -/* Globals for literal tables (built once) */ -/* The real variables are now in the struct gz_global */ -#define fixed_tl (glbl->gz_fixed_tl) -#define fixed_td (glbl->gz_fixed_td) -#define fixed_bl (glbl->gz_fixed_bl) -#define fixed_bd (glbl->gz_fixed_bd) + /* restore the globals from the locals */ + glbl->gz_wp = w; /* restore global window pointer */ + glbl->gz_bb = b; /* restore global bit buffer */ + glbl->gz_bk = k; + return 0; +} -static int inflate_fixed(gz, glbl) -struct gzip *gz; -struct gz_global *glbl; /* decompress an inflated type 1 (fixed Huffman codes) block. We should either replace this with a custom decoder, or at least precompute the Huffman tables. */ +static int +inflate_fixed(glbl) + struct inflate *glbl; { - /* if first time, set up tables for fixed blocks */ - Trace((stderr, "\nliteral block")); - if (fixed_tl == (struct huft *)NULL) - { - int i; /* temporary variable */ - static unsigned l[288]; /* length list for huft_build */ - - /* literal table */ - for (i = 0; i < 144; i++) - l[i] = 8; - for (; i < 256; i++) - l[i] = 9; - for (; i < 280; i++) - l[i] = 7; - for (; i < 288; i++) /* make a complete, but wrong code set */ - l[i] = 8; - fixed_bl = 7; - if ((i = huft_build(gz,l, 288, 257, cplens, cplext, - &fixed_tl, &fixed_bl, glbl)) != 0) - { - fixed_tl = (struct huft *)NULL; - return i; - } - - /* distance table */ - for (i = 0; i < 30; i++) /* make an incomplete code set */ - l[i] = 5; - fixed_bd = 5; - if ((i = huft_build(gz,l, 30, 0, cpdist, cpdext, - &fixed_td, &fixed_bd, glbl)) > 1) - { - huft_free(gz,fixed_tl); - fixed_tl = (struct huft *)NULL; - return i; - } - } - - - /* decompress until an end-of-block code */ - return inflate_codes(gz,fixed_tl, fixed_td, fixed_bl, fixed_bd, glbl) != 0; + /* if first time, set up tables for fixed blocks */ + if (glbl->gz_fixed_tl == (struct huft *) NULL) { + int i; /* temporary variable */ + static unsigned l[288]; /* length list for huft_build */ + + /* literal table */ + for (i = 0; i < 144; i++) + l[i] = 8; + for (; i < 256; i++) + l[i] = 9; + for (; i < 280; i++) + l[i] = 7; + for (; i < 288; i++) /* make a complete, but wrong code + * set */ + l[i] = 8; + glbl->gz_fixed_bl = 7; + if ((i = huft_build(glbl, l, 288, 257, cplens, cplext, + &glbl->gz_fixed_tl, &glbl->gz_fixed_bl)) != 0) { + glbl->gz_fixed_tl = (struct huft *) NULL; + return i; + } + /* distance table */ + for (i = 0; i < 30; i++) /* make an incomplete code + * set */ + l[i] = 5; + glbl->gz_fixed_bd = 5; + if ((i = huft_build(glbl, l, 30, 0, cpdist, cpdext, + &glbl->gz_fixed_td, &glbl->gz_fixed_bd)) > 1) { + huft_free(glbl, glbl->gz_fixed_tl); + glbl->gz_fixed_tl = (struct huft *) NULL; + return i; + } + } + /* decompress until an end-of-block code */ + return inflate_codes(glbl, glbl->gz_fixed_tl, glbl->gz_fixed_td, glbl->gz_fixed_bl, glbl->gz_fixed_bd) != 0; } - - -static int inflate_dynamic(gz, glbl) -struct gzip *gz; -struct gz_global * glbl; /* decompress an inflated type 2 (dynamic Huffman codes) block. */ +static int +inflate_dynamic(glbl) + struct inflate *glbl; { - int i; /* temporary variables */ - unsigned j; - unsigned l; /* last length */ - unsigned m; /* mask for bit lengths table */ - unsigned n; /* number of lengths to get */ - struct huft *tl; /* literal/length code table */ - struct huft *td; /* distance code table */ - int bl; /* lookup bits for tl */ - int bd; /* lookup bits for td */ - unsigned nb; /* number of bit length codes */ - unsigned nl; /* number of literal/length codes */ - unsigned nd; /* number of distance codes */ -#ifdef PKZIP_BUG_WORKAROUND - unsigned ll[288+32]; /* literal/length and distance code lengths */ -#else - unsigned ll[286+30]; /* literal/length and distance code lengths */ -#endif - register ulg b; /* bit buffer */ - register unsigned k; /* number of bits in bit buffer */ - - - /* make local bit buffer */ - Trace((stderr, "\ndynamic block")); - b = bb; - k = bk; - - - /* read in table lengths */ - NEEDBITS(5) - nl = 257 + ((unsigned)b & 0x1f); /* number of literal/length codes */ - DUMPBITS(5) - NEEDBITS(5) - nd = 1 + ((unsigned)b & 0x1f); /* number of distance codes */ - DUMPBITS(5) - NEEDBITS(4) - nb = 4 + ((unsigned)b & 0xf); /* number of bit length codes */ - DUMPBITS(4) + int i; /* temporary variables */ + unsigned j; + unsigned l; /* last length */ + unsigned m; /* mask for bit lengths table */ + unsigned n; /* number of lengths to get */ + struct huft *tl; /* literal/length code table */ + struct huft *td; /* distance code table */ + int bl; /* lookup bits for tl */ + int bd; /* lookup bits for td */ + unsigned nb; /* number of bit length codes */ + unsigned nl; /* number of literal/length codes */ + unsigned nd; /* number of distance codes */ #ifdef PKZIP_BUG_WORKAROUND - if (nl > 288 || nd > 32) + unsigned ll[288 + 32]; /* literal/length and distance code + * lengths */ #else - if (nl > 286 || nd > 30) + unsigned ll[286 + 30]; /* literal/length and distance code + * lengths */ #endif - return 1; /* bad lengths */ - - - /* read in bit-length-code lengths */ - for (j = 0; j < nb; j++) - { - NEEDBITS(3) - ll[border[j]] = (unsigned)b & 7; - DUMPBITS(3) - } - for (; j < 19; j++) - ll[border[j]] = 0; - - - /* build decoding table for trees--single level, 7 bit lookup */ - bl = 7; - if ((i = huft_build(gz,ll, 19, 19, NULL, NULL, &tl, &bl, glbl)) != 0) - { - if (i == 1) - huft_free(gz,tl); - return i; /* incomplete code set */ - } - - - /* read in literal and distance code lengths */ - n = nl + nd; - m = mask[bl]; - i = l = 0; - while ((unsigned)i < n) - { - NEEDBITS((unsigned)bl) - j = (td = tl + ((unsigned)b & m))->b; - DUMPBITS(j) - j = td->v.n; - if (j < 16) /* length of code in bits (0..15) */ - ll[i++] = l = j; /* save last length in l */ - else if (j == 16) /* repeat last length 3 to 6 times */ - { - NEEDBITS(2) - j = 3 + ((unsigned)b & 3); - DUMPBITS(2) - if ((unsigned)i + j > n) - return 1; - while (j--) - ll[i++] = l; - } - else if (j == 17) /* 3 to 10 zero length codes */ - { - NEEDBITS(3) - j = 3 + ((unsigned)b & 7); - DUMPBITS(3) - if ((unsigned)i + j > n) - return 1; - while (j--) - ll[i++] = 0; - l = 0; - } - else /* j == 18: 11 to 138 zero length codes */ - { - NEEDBITS(7) - j = 11 + ((unsigned)b & 0x7f); - DUMPBITS(7) - if ((unsigned)i + j > n) - return 1; - while (j--) - ll[i++] = 0; - l = 0; - } - } - - - /* free decoding table for trees */ - huft_free(gz,tl); - - - /* restore the global bit buffer */ - bb = b; - bk = k; - - - /* build the decoding tables for literal/length and distance codes */ - bl = lbits; - if ((i = huft_build(gz,ll, nl, 257, cplens, cplext, &tl, &bl, glbl)) != 0) - { - if (i == 1 && !qflag) { - FPRINTF( "(incomplete l-tree) "); - huft_free(gz,tl); - } - return i; /* incomplete code set */ - } - bd = dbits; - if ((i = huft_build(gz,ll + nl, nd, 0, cpdist, cpdext, &td, &bd, glbl)) != 0) - { - if (i == 1 && !qflag) { - FPRINTF( "(incomplete d-tree) "); + register ulg b; /* bit buffer */ + register unsigned k; /* number of bits in bit buffer */ + + /* make local bit buffer */ + b = glbl->gz_bb; + k = glbl->gz_bk; + + /* read in table lengths */ + NEEDBITS(glbl, 5) + nl = 257 + ((unsigned) b & 0x1f); /* number of + * literal/length codes */ + DUMPBITS(5) + NEEDBITS(glbl, 5) + nd = 1 + ((unsigned) b & 0x1f); /* number of distance codes */ + DUMPBITS(5) + NEEDBITS(glbl, 4) + nb = 4 + ((unsigned) b & 0xf); /* number of bit length codes */ + DUMPBITS(4) #ifdef PKZIP_BUG_WORKAROUND - i = 0; - } + if (nl > 288 || nd > 32) #else - huft_free(gz,td); - } - huft_free(gz,tl); - return i; /* incomplete code set */ + if (nl > 286 || nd > 30) #endif - } + return 1; /* bad lengths */ + /* read in bit-length-code lengths */ + for (j = 0; j < nb; j++) { + NEEDBITS(glbl, 3) + ll[border[j]] = (unsigned) b & 7; + DUMPBITS(3) + } + for (; j < 19; j++) + ll[border[j]] = 0; + + /* build decoding table for trees--single level, 7 bit lookup */ + bl = 7; + if ((i = huft_build(glbl, ll, 19, 19, NULL, NULL, &tl, &bl)) != 0) { + if (i == 1) + huft_free(glbl, tl); + return i; /* incomplete code set */ + } + /* read in literal and distance code lengths */ + n = nl + nd; + m = mask[bl]; + i = l = 0; + while ((unsigned) i < n) { + NEEDBITS(glbl, (unsigned) bl) + j = (td = tl + ((unsigned) b & m))->b; + DUMPBITS(j) + j = td->v.n; + if (j < 16) /* length of code in bits (0..15) */ + ll[i++] = l = j; /* save last length in l */ + else if (j == 16) { /* repeat last length 3 to 6 times */ + NEEDBITS(glbl, 2) + j = 3 + ((unsigned) b & 3); + DUMPBITS(2) + if ((unsigned) i + j > n) + return 1; + while (j--) + ll[i++] = l; + } else if (j == 17) { /* 3 to 10 zero length codes */ + NEEDBITS(glbl, 3) + j = 3 + ((unsigned) b & 7); + DUMPBITS(3) + if ((unsigned) i + j > n) + return 1; + while (j--) + ll[i++] = 0; + l = 0; + } else { /* j == 18: 11 to 138 zero length codes */ + NEEDBITS(glbl, 7) + j = 11 + ((unsigned) b & 0x7f); + DUMPBITS(7) + if ((unsigned) i + j > n) + return 1; + while (j--) + ll[i++] = 0; + l = 0; + } + } - /* decompress until an end-of-block code */ - if (inflate_codes(gz,tl, td, bl, bd, glbl)) - return 1; + /* free decoding table for trees */ + huft_free(glbl, tl); + /* restore the global bit buffer */ + glbl->gz_bb = b; + glbl->gz_bk = k; - /* free the decoding tables, return */ - huft_free(gz,tl); - huft_free(gz,td); - return 0; + /* build the decoding tables for literal/length and distance codes */ + bl = lbits; + i = huft_build(glbl, ll, nl, 257, cplens, cplext, &tl, &bl); + if (i != 0) { + if (i == 1 && !qflag) { + FPRINTF("(incomplete l-tree) "); + huft_free(glbl, tl); + } + return i; /* incomplete code set */ + } + bd = dbits; + i = huft_build(glbl, ll + nl, nd, 0, cpdist, cpdext, &td, &bd); + if (i != 0) { + if (i == 1 && !qflag) { + FPRINTF("(incomplete d-tree) "); +#ifdef PKZIP_BUG_WORKAROUND + i = 0; + } +#else + huft_free(glbl, td); + } + huft_free(glbl, tl); + return i; /* incomplete code set */ +#endif + } + /* decompress until an end-of-block code */ + if (inflate_codes(glbl, tl, td, bl, bd)) + return 1; + + /* free the decoding tables, return */ + huft_free(glbl, tl); + huft_free(glbl, td); + return 0; } - - -static int inflate_block(gz,e, glbl) -struct gzip *gz; -int *e; /* last block flag */ -struct gz_global * glbl; /* decompress an inflated block */ +static int +inflate_block(glbl, e) + struct inflate *glbl; + int *e; /* last block flag */ { - unsigned t; /* block type */ - register ulg b; /* bit buffer */ - register unsigned k; /* number of bits in bit buffer */ - - - /* make local bit buffer */ - b = bb; - k = bk; - - - /* read in last block bit */ - NEEDBITS(1) - *e = (int)b & 1; - DUMPBITS(1) - - - /* read in block type */ - NEEDBITS(2) - t = (unsigned)b & 3; - DUMPBITS(2) - - - /* restore the global bit buffer */ - bb = b; - bk = k; - - - /* inflate that block type */ - if (t == 2) - return inflate_dynamic(gz, glbl); - if (t == 0) - return inflate_stored(gz, glbl); - if (t == 1) - return inflate_fixed(gz, glbl); - - - /* bad block type */ - return 2; + unsigned t; /* block type */ + register ulg b; /* bit buffer */ + register unsigned k; /* number of bits in bit buffer */ + + /* make local bit buffer */ + b = glbl->gz_bb; + k = glbl->gz_bk; + + /* read in last block bit */ + NEEDBITS(glbl, 1) + * e = (int) b & 1; + DUMPBITS(1) + /* read in block type */ + NEEDBITS(glbl, 2) + t = (unsigned) b & 3; + DUMPBITS(2) + /* restore the global bit buffer */ + glbl->gz_bb = b; + glbl->gz_bk = k; + + /* inflate that block type */ + if (t == 2) + return inflate_dynamic(glbl); + if (t == 0) + return inflate_stored(glbl); + if (t == 1) + return inflate_fixed(glbl); + + /* bad block type */ + return 2; } -int inflate(gz, glbl) -struct gzip *gz; -struct gz_global * glbl; /* decompress an inflated entry */ +static int +xinflate(glbl) + struct inflate *glbl; { - int e; /* last block flag */ - int r; /* result code */ - unsigned h; /* maximum struct huft's malloc'ed */ - - - fixed_tl = (struct huft *)NULL; - - /* initialize window, bit buffer */ - wp = 0; - bk = 0; - bb = 0; + int e; /* last block flag */ + int r; /* result code */ + unsigned h; /* maximum struct huft's malloc'ed */ + + glbl->gz_fixed_tl = (struct huft *) NULL; + + /* initialize window, bit buffer */ + glbl->gz_wp = 0; + glbl->gz_bk = 0; + glbl->gz_bb = 0; + + /* decompress until the last block */ + h = 0; + do { + glbl->gz_hufts = 0; + if ((r = inflate_block(glbl, &e)) != 0) + return r; + if (glbl->gz_hufts > h) + h = glbl->gz_hufts; + } while (!e); + + /* flush out slide */ + FLUSH(glbl, glbl->gz_wp); + + /* return success */ + return 0; +} - /* decompress until the last block */ - h = 0; - do { - hufts = 0; - if ((r = inflate_block(gz,&e, glbl)) != 0) - return r; - if (hufts > h) - h = hufts; - } while (!e); +/* Nobody uses this - why not? */ +int +inflate(glbl) + struct inflate *glbl; +{ + int i; + u_char *p = NULL; + if (!glbl->gz_slide) + p = glbl->gz_slide = malloc(GZ_WSIZE, M_GZIP, M_WAITOK); - /* flush out slide */ - FLUSH(gz,wp); + if (!glbl->gz_slide) + return(ENOMEM); + i = xinflate(glbl); - /* return success */ - Trace((stderr, "\n%u bytes in Huffman tables (%d/entry)\n", - h * sizeof(struct huft), sizeof(struct huft))); - return 0; -} - + if (glbl->gz_fixed_td != (struct huft *) NULL) { + huft_free(glbl, glbl->gz_fixed_td); + glbl->gz_fixed_td = (struct huft *) NULL; + } + if (glbl->gz_fixed_tl != (struct huft *) NULL) { + huft_free(glbl, glbl->gz_fixed_tl); + glbl->gz_fixed_tl = (struct huft *) NULL; + } + if (p == glbl->gz_slide) { + free(glbl->gz_slide, M_GZIP); + glbl->gz_slide = NULL; + } -#if 0 -/* Nobody uses this - why not? */ -static int inflate_free(gz, glbl) -struct gzip *gz; -struct gz_global * glbl; -{ - if (fixed_tl != (struct huft *)NULL) - { - huft_free(gz,fixed_td); - huft_free(gz,fixed_tl); - fixed_td = fixed_tl = (struct huft *)NULL; - } - return 0; + return i; } -#endif +/* ----------------------- END INFLATE.C */ diff --git a/sys/sys/inflate.h b/sys/sys/inflate.h index 68085e6..4ced71e 100644 --- a/sys/sys/inflate.h +++ b/sys/sys/inflate.h @@ -1,85 +1,53 @@ /* - * Parts of this file are not covered by: * ---------------------------------------------------------------------------- * "THE BEER-WARE LICENSE" (Revision 42): - * <phk@login.dknet.dk> wrote this file. As long as you retain this notice you + * <phk@login.dkuug.dk> wrote this file. As long as you retain this notice you * can do whatever you want with this stuff. If we meet some day, and you think * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp * ---------------------------------------------------------------------------- * - * $Id: inflate.h,v 1.2 1994/10/07 23:18:18 csgr Exp $ + * $Id$ * - * This module handles execution of a.out files which have been run through - * "gzip -9". - * - * For now you need to use exactly this command to compress the binaries: - * - * gzip -9 -v < /bin/sh > /tmp/sh - * - * TODO: - * text-segments should be made R/O after being filled - * is the vm-stuff safe ? - * should handle the entire header of gzip'ed stuff. - * inflate isn't quite reentrant yet... - * error-handling is a mess... - * so is the rest... - * tidy up unnecessary includes */ - - -#ifndef _SYS_INFLATE_H_ -#define _SYS_INFLATE_H_ +#ifndef _SYS_INFLATE_H_ +#define _SYS_INFLATE_H_ #ifdef KERNEL -#include <sys/param.h> -#include <sys/imgact.h> -#include <sys/imgact_aout.h> - +#define GZ_EOF -1 -/* needed to make inflate() work */ -#define uch u_char -#define ush u_short -#define ulg u_long - - -#define WSIZE 0x8000 - -struct gzip { - struct image_params *ip; - struct exec a_out; - int error; - int where; - u_char *inbuf; - u_long offset; - u_long output; - u_long len; - int idx; - u_long virtual_offset, file_offset, file_end, bss_size; - unsigned gz_wp; - u_char *gz_slide; -}; +#define GZ_WSIZE 0x8000 /* * Global variables used by inflate and friends. * This structure is used in order to make inflate() reentrant. */ -struct gz_global { - ulg gz_bb; /* bit buffer */ - unsigned gz_bk; /* bits in bit buffer */ - unsigned gz_hufts; /* track memory usage */ - struct huft *gz_fixed_tl; /* must init to NULL !! */ - struct huft *gz_fixed_td; - int gz_fixed_bl; - int gz_fixed_bd; +struct inflate { + /* Public part */ + + /* This pointer is passed along to the two functions below */ + void *gz_private; + + /* Fetch next character to be uncompressed */ + int (*gz_input) (void *); + + /* Dispose of uncompressed characters */ + int (*gz_output) (void *, u_char *, u_long); + + /* Private part */ + u_long gz_bb; /* bit buffer */ + unsigned gz_bk; /* bits in bit buffer */ + unsigned gz_hufts; /* track memory usage */ + struct huft *gz_fixed_tl; /* must init to NULL !! */ + struct huft *gz_fixed_td; + int gz_fixed_bl; + int gz_fixed_bd; + u_char *gz_slide; + unsigned gz_wp; }; -int inflate __P((struct gzip *, struct gz_global *)); -int do_aout_hdr __P((struct gzip *)); - -#define slide (gz->gz_slide) -#define wp (gz->gz_wp) +int inflate __P((struct inflate *)); -#endif /* KERNEL */ +#endif /* KERNEL */ -#endif /* ! _SYS_INFLATE_H_ */ +#endif /* ! _SYS_INFLATE_H_ */ |
