[PATCH] ppc64 boot: remove zlib
Switch ppc64 to the in-kernel zlib, it has less bugs than the current one. The code in arch/ppc64/boot is compiled as 32bit, so it can not use the includes from include/asm. Copy all zlib related header files and convert them with sed. Reduce the scratch size to 47k, check possible changes at runtime. Signed-off-by: Olaf Hering <olh@suse.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Anton Blanchard <anton@samba.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Olaf Hering
Paul Mackerras
Родитель
8afe31c9eb
Коммит
7054036fc5
|
|
@ -27,10 +27,41 @@ BOOTAFLAGS := -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional -nostdinc
|
|||
BOOTLFLAGS := -Ttext 0x00400000 -e _start -T $(srctree)/$(src)/zImage.lds
|
||||
OBJCOPYFLAGS := contents,alloc,load,readonly,data
|
||||
|
||||
src-boot := crt0.S string.S prom.c main.c zlib.c imagesize.c div64.S
|
||||
zlib := infblock.c infcodes.c inffast.c inflate.c inftrees.c infutil.c
|
||||
zlibheader := infblock.h infcodes.h inffast.h inftrees.h infutil.h
|
||||
zliblinuxheader := zlib.h zconf.h zutil.h
|
||||
|
||||
$(addprefix $(obj)/,$(zlib) main.o): $(addprefix $(obj)/,$(zliblinuxheader)) $(addprefix $(obj)/,$(zlibheader))
|
||||
#$(addprefix $(obj)/,main.o): $(addprefix $(obj)/,zlib.h)
|
||||
|
||||
src-boot := crt0.S string.S prom.c main.c imagesize.c div64.S
|
||||
src-boot += $(zlib)
|
||||
src-boot := $(addprefix $(obj)/, $(src-boot))
|
||||
obj-boot := $(addsuffix .o, $(basename $(src-boot)))
|
||||
|
||||
BOOTCFLAGS += -I$(obj) -I$(srctree)/$(obj)
|
||||
|
||||
quiet_cmd_copy_zlib = COPY $@
|
||||
cmd_copy_zlib = sed "s@__attribute_used__@@;s@<linux/\([^>]\+\).*@\"\1\"@" $< > $@
|
||||
|
||||
quiet_cmd_copy_zlibheader = COPY $@
|
||||
cmd_copy_zlibheader = sed "s@<linux/\([^>]\+\).*@\"\1\"@" $< > $@
|
||||
# stddef.h for NULL
|
||||
quiet_cmd_copy_zliblinuxheader = COPY $@
|
||||
cmd_copy_zliblinuxheader = sed "s@<linux/string.h>@\"string.h\"@;s@<linux/kernel.h>@<stddef.h>@;s@<linux/\([^>]\+\).*@\"\1\"@" $< > $@
|
||||
|
||||
$(addprefix $(obj)/,$(zlib)): $(obj)/%: $(srctree)/lib/zlib_inflate/%
|
||||
$(call cmd,copy_zlib)
|
||||
|
||||
$(addprefix $(obj)/,$(zlibheader)): $(obj)/%: $(srctree)/lib/zlib_inflate/%
|
||||
$(call cmd,copy_zlibheader)
|
||||
|
||||
$(addprefix $(obj)/,$(zliblinuxheader)): $(obj)/%: $(srctree)/include/linux/%
|
||||
$(call cmd,copy_zliblinuxheader)
|
||||
|
||||
clean-files := $(zlib) $(zlibheader) $(zliblinuxheader)
|
||||
|
||||
|
||||
quiet_cmd_bootcc = BOOTCC $@
|
||||
cmd_bootcc = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTCFLAGS) -c -o $@ $<
|
||||
|
||||
|
|
|
|||
|
|
@ -26,12 +26,6 @@ extern void flush_cache(void *, unsigned long);
|
|||
#define RAM_END (512<<20) // Fixme: use OF */
|
||||
#define ONE_MB 0x100000
|
||||
|
||||
static char *avail_ram;
|
||||
static char *begin_avail, *end_avail;
|
||||
static char *avail_high;
|
||||
static unsigned int heap_use;
|
||||
static unsigned int heap_max;
|
||||
|
||||
extern char _start[];
|
||||
extern char _end[];
|
||||
extern char _vmlinux_start[];
|
||||
|
|
@ -50,7 +44,8 @@ static struct addr_range vmlinux = {0, 0, 0};
|
|||
static struct addr_range vmlinuz = {0, 0, 0};
|
||||
static struct addr_range initrd = {0, 0, 0};
|
||||
|
||||
static char scratch[128<<10]; /* 128kB of scratch space for gunzip */
|
||||
static char scratch[46912]; /* scratch space for gunzip, from zlib_inflate_workspacesize() */
|
||||
|
||||
|
||||
typedef void (*kernel_entry_t)( unsigned long,
|
||||
unsigned long,
|
||||
|
|
@ -161,17 +156,12 @@ void start(unsigned long a1, unsigned long a2, void *promptr)
|
|||
/* Eventually gunzip the kernel */
|
||||
if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
|
||||
int len;
|
||||
avail_ram = scratch;
|
||||
begin_avail = avail_high = avail_ram;
|
||||
end_avail = scratch + sizeof(scratch);
|
||||
printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
|
||||
vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
|
||||
len = vmlinuz.size;
|
||||
gunzip((void *)vmlinux.addr, vmlinux.size,
|
||||
(unsigned char *)vmlinuz.addr, &len);
|
||||
printf("done 0x%lx bytes\n\r", len);
|
||||
printf("0x%x bytes of heap consumed, max in use 0x%x\n\r",
|
||||
(unsigned)(avail_high - begin_avail), heap_max);
|
||||
} else {
|
||||
memmove((void *)vmlinux.addr,(void *)vmlinuz.addr,vmlinuz.size);
|
||||
}
|
||||
|
|
@ -225,64 +215,12 @@ void start(unsigned long a1, unsigned long a2, void *promptr)
|
|||
exit();
|
||||
}
|
||||
|
||||
struct memchunk {
|
||||
unsigned int size;
|
||||
unsigned int pad;
|
||||
struct memchunk *next;
|
||||
};
|
||||
|
||||
static struct memchunk *freechunks;
|
||||
|
||||
void *zalloc(void *x, unsigned items, unsigned size)
|
||||
{
|
||||
void *p;
|
||||
struct memchunk **mpp, *mp;
|
||||
|
||||
size *= items;
|
||||
size = _ALIGN(size, sizeof(struct memchunk));
|
||||
heap_use += size;
|
||||
if (heap_use > heap_max)
|
||||
heap_max = heap_use;
|
||||
for (mpp = &freechunks; (mp = *mpp) != 0; mpp = &mp->next) {
|
||||
if (mp->size == size) {
|
||||
*mpp = mp->next;
|
||||
return mp;
|
||||
}
|
||||
}
|
||||
p = avail_ram;
|
||||
avail_ram += size;
|
||||
if (avail_ram > avail_high)
|
||||
avail_high = avail_ram;
|
||||
if (avail_ram > end_avail) {
|
||||
printf("oops... out of memory\n\r");
|
||||
pause();
|
||||
}
|
||||
return p;
|
||||
}
|
||||
|
||||
void zfree(void *x, void *addr, unsigned nb)
|
||||
{
|
||||
struct memchunk *mp = addr;
|
||||
|
||||
nb = _ALIGN(nb, sizeof(struct memchunk));
|
||||
heap_use -= nb;
|
||||
if (avail_ram == addr + nb) {
|
||||
avail_ram = addr;
|
||||
return;
|
||||
}
|
||||
mp->size = nb;
|
||||
mp->next = freechunks;
|
||||
freechunks = mp;
|
||||
}
|
||||
|
||||
#define HEAD_CRC 2
|
||||
#define EXTRA_FIELD 4
|
||||
#define ORIG_NAME 8
|
||||
#define COMMENT 0x10
|
||||
#define RESERVED 0xe0
|
||||
|
||||
#define DEFLATED 8
|
||||
|
||||
static void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
|
||||
{
|
||||
z_stream s;
|
||||
|
|
@ -291,7 +229,7 @@ static void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
|
|||
/* skip header */
|
||||
i = 10;
|
||||
flags = src[3];
|
||||
if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
|
||||
if (src[2] != Z_DEFLATED || (flags & RESERVED) != 0) {
|
||||
printf("bad gzipped data\n\r");
|
||||
exit();
|
||||
}
|
||||
|
|
@ -310,9 +248,13 @@ static void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
|
|||
exit();
|
||||
}
|
||||
|
||||
s.zalloc = zalloc;
|
||||
s.zfree = zfree;
|
||||
r = inflateInit2(&s, -MAX_WBITS);
|
||||
if (zlib_inflate_workspacesize() > sizeof(scratch)) {
|
||||
printf("gunzip needs more mem\n");
|
||||
exit();
|
||||
}
|
||||
memset(&s, 0, sizeof(s));
|
||||
s.workspace = scratch;
|
||||
r = zlib_inflateInit2(&s, -MAX_WBITS);
|
||||
if (r != Z_OK) {
|
||||
printf("inflateInit2 returned %d\n\r", r);
|
||||
exit();
|
||||
|
|
@ -321,12 +263,12 @@ static void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
|
|||
s.avail_in = *lenp - i;
|
||||
s.next_out = dst;
|
||||
s.avail_out = dstlen;
|
||||
r = inflate(&s, Z_FINISH);
|
||||
r = zlib_inflate(&s, Z_FINISH);
|
||||
if (r != Z_OK && r != Z_STREAM_END) {
|
||||
printf("inflate returned %d msg: %s\n\r", r, s.msg);
|
||||
exit();
|
||||
}
|
||||
*lenp = s.next_out - (unsigned char *) dst;
|
||||
inflateEnd(&s);
|
||||
zlib_inflateEnd(&s);
|
||||
}
|
||||
|
||||
|
|
|
|||
Разница между файлами не показана из-за своего большого размера
Загрузить разницу
|
|
@ -1,432 +0,0 @@
|
|||
/* */
|
||||
|
||||
/*
|
||||
* This file is derived from zlib.h and zconf.h from the zlib-0.95
|
||||
* distribution by Jean-loup Gailly and Mark Adler, with some additions
|
||||
* by Paul Mackerras to aid in implementing Deflate compression and
|
||||
* decompression for PPP packets.
|
||||
*/
|
||||
|
||||
/*
|
||||
* ==FILEVERSION 960122==
|
||||
*
|
||||
* This marker is used by the Linux installation script to determine
|
||||
* whether an up-to-date version of this file is already installed.
|
||||
*/
|
||||
|
||||
/* zlib.h -- interface of the 'zlib' general purpose compression library
|
||||
version 0.95, Aug 16th, 1995.
|
||||
|
||||
Copyright (C) 1995 Jean-loup Gailly and Mark Adler
|
||||
|
||||
This software is provided 'as-is', without any express or implied
|
||||
warranty. In no event will the authors be held liable for any damages
|
||||
arising from the use of this software.
|
||||
|
||||
Permission is granted to anyone to use this software for any purpose,
|
||||
including commercial applications, and to alter it and redistribute it
|
||||
freely, subject to the following restrictions:
|
||||
|
||||
1. The origin of this software must not be misrepresented; you must not
|
||||
claim that you wrote the original software. If you use this software
|
||||
in a product, an acknowledgment in the product documentation would be
|
||||
appreciated but is not required.
|
||||
2. Altered source versions must be plainly marked as such, and must not be
|
||||
misrepresented as being the original software.
|
||||
3. This notice may not be removed or altered from any source distribution.
|
||||
|
||||
Jean-loup Gailly Mark Adler
|
||||
gzip@prep.ai.mit.edu madler@alumni.caltech.edu
|
||||
*/
|
||||
|
||||
#ifndef _ZLIB_H
|
||||
#define _ZLIB_H
|
||||
|
||||
/* #include "zconf.h" */ /* included directly here */
|
||||
|
||||
/* zconf.h -- configuration of the zlib compression library
|
||||
* Copyright (C) 1995 Jean-loup Gailly.
|
||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||
*/
|
||||
|
||||
/* From: zconf.h,v 1.12 1995/05/03 17:27:12 jloup Exp */
|
||||
|
||||
/*
|
||||
The library does not install any signal handler. It is recommended to
|
||||
add at least a handler for SIGSEGV when decompressing; the library checks
|
||||
the consistency of the input data whenever possible but may go nuts
|
||||
for some forms of corrupted input.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Compile with -DMAXSEG_64K if the alloc function cannot allocate more
|
||||
* than 64k bytes at a time (needed on systems with 16-bit int).
|
||||
* Compile with -DUNALIGNED_OK if it is OK to access shorts or ints
|
||||
* at addresses which are not a multiple of their size.
|
||||
* Under DOS, -DFAR=far or -DFAR=__far may be needed.
|
||||
*/
|
||||
|
||||
#ifndef STDC
|
||||
# if defined(MSDOS) || defined(__STDC__) || defined(__cplusplus)
|
||||
# define STDC
|
||||
# endif
|
||||
#endif
|
||||
|
||||
#ifdef __MWERKS__ /* Metrowerks CodeWarrior declares fileno() in unix.h */
|
||||
# include <unix.h>
|
||||
#endif
|
||||
|
||||
/* Maximum value for memLevel in deflateInit2 */
|
||||
#ifndef MAX_MEM_LEVEL
|
||||
# ifdef MAXSEG_64K
|
||||
# define MAX_MEM_LEVEL 8
|
||||
# else
|
||||
# define MAX_MEM_LEVEL 9
|
||||
# endif
|
||||
#endif
|
||||
|
||||
#ifndef FAR
|
||||
# define FAR
|
||||
#endif
|
||||
|
||||
/* Maximum value for windowBits in deflateInit2 and inflateInit2 */
|
||||
#ifndef MAX_WBITS
|
||||
# define MAX_WBITS 15 /* 32K LZ77 window */
|
||||
#endif
|
||||
|
||||
/* The memory requirements for deflate are (in bytes):
|
||||
1 << (windowBits+2) + 1 << (memLevel+9)
|
||||
that is: 128K for windowBits=15 + 128K for memLevel = 8 (default values)
|
||||
plus a few kilobytes for small objects. For example, if you want to reduce
|
||||
the default memory requirements from 256K to 128K, compile with
|
||||
make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
|
||||
Of course this will generally degrade compression (there's no free lunch).
|
||||
|
||||
The memory requirements for inflate are (in bytes) 1 << windowBits
|
||||
that is, 32K for windowBits=15 (default value) plus a few kilobytes
|
||||
for small objects.
|
||||
*/
|
||||
|
||||
/* Type declarations */
|
||||
|
||||
#ifndef OF /* function prototypes */
|
||||
# ifdef STDC
|
||||
# define OF(args) args
|
||||
# else
|
||||
# define OF(args) ()
|
||||
# endif
|
||||
#endif
|
||||
|
||||
typedef unsigned char Byte; /* 8 bits */
|
||||
typedef unsigned int uInt; /* 16 bits or more */
|
||||
typedef unsigned long uLong; /* 32 bits or more */
|
||||
|
||||
typedef Byte FAR Bytef;
|
||||
typedef char FAR charf;
|
||||
typedef int FAR intf;
|
||||
typedef uInt FAR uIntf;
|
||||
typedef uLong FAR uLongf;
|
||||
|
||||
#ifdef STDC
|
||||
typedef void FAR *voidpf;
|
||||
typedef void *voidp;
|
||||
#else
|
||||
typedef Byte FAR *voidpf;
|
||||
typedef Byte *voidp;
|
||||
#endif
|
||||
|
||||
/* end of original zconf.h */
|
||||
|
||||
#define ZLIB_VERSION "0.95P"
|
||||
|
||||
/*
|
||||
The 'zlib' compression library provides in-memory compression and
|
||||
decompression functions, including integrity checks of the uncompressed
|
||||
data. This version of the library supports only one compression method
|
||||
(deflation) but other algorithms may be added later and will have the same
|
||||
stream interface.
|
||||
|
||||
For compression the application must provide the output buffer and
|
||||
may optionally provide the input buffer for optimization. For decompression,
|
||||
the application must provide the input buffer and may optionally provide
|
||||
the output buffer for optimization.
|
||||
|
||||
Compression can be done in a single step if the buffers are large
|
||||
enough (for example if an input file is mmap'ed), or can be done by
|
||||
repeated calls of the compression function. In the latter case, the
|
||||
application must provide more input and/or consume the output
|
||||
(providing more output space) before each call.
|
||||
*/
|
||||
|
||||
typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
|
||||
typedef void (*free_func) OF((voidpf opaque, voidpf address, uInt nbytes));
|
||||
|
||||
struct internal_state;
|
||||
|
||||
typedef struct z_stream_s {
|
||||
Bytef *next_in; /* next input byte */
|
||||
uInt avail_in; /* number of bytes available at next_in */
|
||||
uLong total_in; /* total nb of input bytes read so far */
|
||||
|
||||
Bytef *next_out; /* next output byte should be put there */
|
||||
uInt avail_out; /* remaining free space at next_out */
|
||||
uLong total_out; /* total nb of bytes output so far */
|
||||
|
||||
char *msg; /* last error message, NULL if no error */
|
||||
struct internal_state FAR *state; /* not visible by applications */
|
||||
|
||||
alloc_func zalloc; /* used to allocate the internal state */
|
||||
free_func zfree; /* used to free the internal state */
|
||||
voidp opaque; /* private data object passed to zalloc and zfree */
|
||||
|
||||
Byte data_type; /* best guess about the data type: ascii or binary */
|
||||
|
||||
} z_stream;
|
||||
|
||||
/*
|
||||
The application must update next_in and avail_in when avail_in has
|
||||
dropped to zero. It must update next_out and avail_out when avail_out
|
||||
has dropped to zero. The application must initialize zalloc, zfree and
|
||||
opaque before calling the init function. All other fields are set by the
|
||||
compression library and must not be updated by the application.
|
||||
|
||||
The opaque value provided by the application will be passed as the first
|
||||
parameter for calls of zalloc and zfree. This can be useful for custom
|
||||
memory management. The compression library attaches no meaning to the
|
||||
opaque value.
|
||||
|
||||
zalloc must return Z_NULL if there is not enough memory for the object.
|
||||
On 16-bit systems, the functions zalloc and zfree must be able to allocate
|
||||
exactly 65536 bytes, but will not be required to allocate more than this
|
||||
if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS,
|
||||
pointers returned by zalloc for objects of exactly 65536 bytes *must*
|
||||
have their offset normalized to zero. The default allocation function
|
||||
provided by this library ensures this (see zutil.c). To reduce memory
|
||||
requirements and avoid any allocation of 64K objects, at the expense of
|
||||
compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h).
|
||||
|
||||
The fields total_in and total_out can be used for statistics or
|
||||
progress reports. After compression, total_in holds the total size of
|
||||
the uncompressed data and may be saved for use in the decompressor
|
||||
(particularly if the decompressor wants to decompress everything in
|
||||
a single step).
|
||||
*/
|
||||
|
||||
/* constants */
|
||||
|
||||
#define Z_NO_FLUSH 0
|
||||
#define Z_PARTIAL_FLUSH 1
|
||||
#define Z_FULL_FLUSH 2
|
||||
#define Z_SYNC_FLUSH 3 /* experimental: partial_flush + byte align */
|
||||
#define Z_FINISH 4
|
||||
#define Z_PACKET_FLUSH 5
|
||||
/* See deflate() below for the usage of these constants */
|
||||
|
||||
#define Z_OK 0
|
||||
#define Z_STREAM_END 1
|
||||
#define Z_ERRNO (-1)
|
||||
#define Z_STREAM_ERROR (-2)
|
||||
#define Z_DATA_ERROR (-3)
|
||||
#define Z_MEM_ERROR (-4)
|
||||
#define Z_BUF_ERROR (-5)
|
||||
/* error codes for the compression/decompression functions */
|
||||
|
||||
#define Z_BEST_SPEED 1
|
||||
#define Z_BEST_COMPRESSION 9
|
||||
#define Z_DEFAULT_COMPRESSION (-1)
|
||||
/* compression levels */
|
||||
|
||||
#define Z_FILTERED 1
|
||||
#define Z_HUFFMAN_ONLY 2
|
||||
#define Z_DEFAULT_STRATEGY 0
|
||||
|
||||
#define Z_BINARY 0
|
||||
#define Z_ASCII 1
|
||||
#define Z_UNKNOWN 2
|
||||
/* Used to set the data_type field */
|
||||
|
||||
#define Z_NULL 0 /* for initializing zalloc, zfree, opaque */
|
||||
|
||||
extern char *zlib_version;
|
||||
/* The application can compare zlib_version and ZLIB_VERSION for consistency.
|
||||
If the first character differs, the library code actually used is
|
||||
not compatible with the zlib.h header file used by the application.
|
||||
*/
|
||||
|
||||
/* basic functions */
|
||||
|
||||
extern int inflateInit OF((z_stream *strm));
|
||||
/*
|
||||
Initializes the internal stream state for decompression. The fields
|
||||
zalloc and zfree must be initialized before by the caller. If zalloc and
|
||||
zfree are set to Z_NULL, inflateInit updates them to use default allocation
|
||||
functions.
|
||||
|
||||
inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
|
||||
enough memory. msg is set to null if there is no error message.
|
||||
inflateInit does not perform any decompression: this will be done by
|
||||
inflate().
|
||||
*/
|
||||
|
||||
|
||||
extern int inflate OF((z_stream *strm, int flush));
|
||||
/*
|
||||
Performs one or both of the following actions:
|
||||
|
||||
- Decompress more input starting at next_in and update next_in and avail_in
|
||||
accordingly. If not all input can be processed (because there is not
|
||||
enough room in the output buffer), next_in is updated and processing
|
||||
will resume at this point for the next call of inflate().
|
||||
|
||||
- Provide more output starting at next_out and update next_out and avail_out
|
||||
accordingly. inflate() always provides as much output as possible
|
||||
(until there is no more input data or no more space in the output buffer).
|
||||
|
||||
Before the call of inflate(), the application should ensure that at least
|
||||
one of the actions is possible, by providing more input and/or consuming
|
||||
more output, and updating the next_* and avail_* values accordingly.
|
||||
The application can consume the uncompressed output when it wants, for
|
||||
example when the output buffer is full (avail_out == 0), or after each
|
||||
call of inflate().
|
||||
|
||||
If the parameter flush is set to Z_PARTIAL_FLUSH or Z_PACKET_FLUSH,
|
||||
inflate flushes as much output as possible to the output buffer. The
|
||||
flushing behavior of inflate is not specified for values of the flush
|
||||
parameter other than Z_PARTIAL_FLUSH, Z_PACKET_FLUSH or Z_FINISH, but the
|
||||
current implementation actually flushes as much output as possible
|
||||
anyway. For Z_PACKET_FLUSH, inflate checks that once all the input data
|
||||
has been consumed, it is expecting to see the length field of a stored
|
||||
block; if not, it returns Z_DATA_ERROR.
|
||||
|
||||
inflate() should normally be called until it returns Z_STREAM_END or an
|
||||
error. However if all decompression is to be performed in a single step
|
||||
(a single call of inflate), the parameter flush should be set to
|
||||
Z_FINISH. In this case all pending input is processed and all pending
|
||||
output is flushed; avail_out must be large enough to hold all the
|
||||
uncompressed data. (The size of the uncompressed data may have been saved
|
||||
by the compressor for this purpose.) The next operation on this stream must
|
||||
be inflateEnd to deallocate the decompression state. The use of Z_FINISH
|
||||
is never required, but can be used to inform inflate that a faster routine
|
||||
may be used for the single inflate() call.
|
||||
|
||||
inflate() returns Z_OK if some progress has been made (more input
|
||||
processed or more output produced), Z_STREAM_END if the end of the
|
||||
compressed data has been reached and all uncompressed output has been
|
||||
produced, Z_DATA_ERROR if the input data was corrupted, Z_STREAM_ERROR if
|
||||
the stream structure was inconsistent (for example if next_in or next_out
|
||||
was NULL), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR if no
|
||||
progress is possible or if there was not enough room in the output buffer
|
||||
when Z_FINISH is used. In the Z_DATA_ERROR case, the application may then
|
||||
call inflateSync to look for a good compression block. */
|
||||
|
||||
|
||||
extern int inflateEnd OF((z_stream *strm));
|
||||
/*
|
||||
All dynamically allocated data structures for this stream are freed.
|
||||
This function discards any unprocessed input and does not flush any
|
||||
pending output.
|
||||
|
||||
inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state
|
||||
was inconsistent. In the error case, msg may be set but then points to a
|
||||
static string (which must not be deallocated).
|
||||
*/
|
||||
|
||||
/* advanced functions */
|
||||
|
||||
extern int inflateInit2 OF((z_stream *strm,
|
||||
int windowBits));
|
||||
/*
|
||||
This is another version of inflateInit with more compression options. The
|
||||
fields next_out, zalloc and zfree must be initialized before by the caller.
|
||||
|
||||
The windowBits parameter is the base two logarithm of the maximum window
|
||||
size (the size of the history buffer). It should be in the range 8..15 for
|
||||
this version of the library (the value 16 will be allowed soon). The
|
||||
default value is 15 if inflateInit is used instead. If a compressed stream
|
||||
with a larger window size is given as input, inflate() will return with
|
||||
the error code Z_DATA_ERROR instead of trying to allocate a larger window.
|
||||
|
||||
If next_out is not null, the library will use this buffer for the history
|
||||
buffer; the buffer must either be large enough to hold the entire output
|
||||
data, or have at least 1<<windowBits bytes. If next_out is null, the
|
||||
library will allocate its own buffer (and leave next_out null). next_in
|
||||
need not be provided here but must be provided by the application for the
|
||||
next call of inflate().
|
||||
|
||||
If the history buffer is provided by the application, next_out must
|
||||
never be changed by the application since the decompressor maintains
|
||||
history information inside this buffer from call to call; the application
|
||||
can only reset next_out to the beginning of the history buffer when
|
||||
avail_out is zero and all output has been consumed.
|
||||
|
||||
inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was
|
||||
not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
|
||||
windowBits < 8). msg is set to null if there is no error message.
|
||||
inflateInit2 does not perform any decompression: this will be done by
|
||||
inflate().
|
||||
*/
|
||||
|
||||
extern int inflateSync OF((z_stream *strm));
|
||||
/*
|
||||
Skips invalid compressed data until the special marker (see deflate()
|
||||
above) can be found, or until all available input is skipped. No output
|
||||
is provided.
|
||||
|
||||
inflateSync returns Z_OK if the special marker has been found, Z_BUF_ERROR
|
||||
if no more input was provided, Z_DATA_ERROR if no marker has been found,
|
||||
or Z_STREAM_ERROR if the stream structure was inconsistent. In the success
|
||||
case, the application may save the current current value of total_in which
|
||||
indicates where valid compressed data was found. In the error case, the
|
||||
application may repeatedly call inflateSync, providing more input each time,
|
||||
until success or end of the input data.
|
||||
*/
|
||||
|
||||
extern int inflateReset OF((z_stream *strm));
|
||||
/*
|
||||
This function is equivalent to inflateEnd followed by inflateInit,
|
||||
but does not free and reallocate all the internal decompression state.
|
||||
The stream will keep attributes that may have been set by inflateInit2.
|
||||
|
||||
inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
|
||||
stream state was inconsistent (such as zalloc or state being NULL).
|
||||
*/
|
||||
|
||||
extern int inflateIncomp OF((z_stream *strm));
|
||||
/*
|
||||
This function adds the data at next_in (avail_in bytes) to the output
|
||||
history without performing any output. There must be no pending output,
|
||||
and the decompressor must be expecting to see the start of a block.
|
||||
Calling this function is equivalent to decompressing a stored block
|
||||
containing the data at next_in (except that the data is not output).
|
||||
*/
|
||||
|
||||
/* checksum functions */
|
||||
|
||||
/*
|
||||
This function is not related to compression but is exported
|
||||
anyway because it might be useful in applications using the
|
||||
compression library.
|
||||
*/
|
||||
|
||||
extern uLong adler32 OF((uLong adler, Bytef *buf, uInt len));
|
||||
|
||||
/*
|
||||
Update a running Adler-32 checksum with the bytes buf[0..len-1] and
|
||||
return the updated checksum. If buf is NULL, this function returns
|
||||
the required initial value for the checksum.
|
||||
An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
|
||||
much faster. Usage example:
|
||||
|
||||
uLong adler = adler32(0L, Z_NULL, 0);
|
||||
|
||||
while (read_buffer(buffer, length) != EOF) {
|
||||
adler = adler32(adler, buffer, length);
|
||||
}
|
||||
if (adler != original_adler) error();
|
||||
*/
|
||||
|
||||
#ifndef _Z_UTIL_H
|
||||
struct internal_state {int dummy;}; /* hack for buggy compilers */
|
||||
#endif
|
||||
|
||||
#endif /* _ZLIB_H */
|
||||
Загрузка…
Ссылка в новой задаче