[libxml2] Cleanups of lzma support
- From: Daniel Veillard <veillard src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [libxml2] Cleanups of lzma support
- Date: Fri, 27 Jan 2012 14:21:22 +0000 (UTC)
commit adf5ec9496828b18e683fb23bd1e670824cfb6d0
Author: Daniel Veillard <veillard redhat com>
Date: Thu Jan 26 16:56:22 2012 +0800
Cleanups of lzma support
- fix inclusion of the separated file
- use namespaced name for the 4 non-static routines
- add padding after external structures included in-situ
- add new requirement to spec file
- general cleanup of code
Makefile.am | 6 +-
libxml.spec.in | 3 +-
xmlIO.c | 10 +-
xzlib.c | 488 +++++++++++++++++++++++++++++++-------------------------
xzlib.h | 22 ++-
5 files changed, 301 insertions(+), 228 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 859c7da..ae72711 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -40,7 +40,7 @@ libxml2_la_SOURCES = SAX.c entities.c encoding.c error.c parserInternals.c \
xmlregexp.c xmlschemas.c xmlschemastypes.c xmlunicode.c \
triostr.c trio.c xmlreader.c relaxng.c dict.c SAX2.c \
xmlwriter.c legacy.c chvalid.c pattern.c xmlsave.c \
- xmlmodule.c schematron.c
+ xmlmodule.c schematron.c xzlib.c
else
libxml2_la_SOURCES = SAX.c entities.c encoding.c error.c parserInternals.c \
parser.c tree.c hash.c list.c xmlIO.c xmlmemory.c uri.c \
@@ -50,7 +50,7 @@ libxml2_la_SOURCES = SAX.c entities.c encoding.c error.c parserInternals.c \
xmlregexp.c xmlschemas.c xmlschemastypes.c xmlunicode.c \
xmlreader.c relaxng.c dict.c SAX2.c \
xmlwriter.c legacy.c chvalid.c pattern.c xmlsave.c \
- xmlmodule.c schematron.c
+ xmlmodule.c schematron.c xzlib.c
endif
DEPS = $(top_builddir)/libxml2.la
@@ -1195,7 +1195,7 @@ EXTRA_DIST = xml2-config.in xml2Conf.sh.in libxml.spec.in libxml2.spec \
example/Makefile.am example/gjobread.c example/gjobs.xml \
$(man_MANS) libxml-2.0.pc.in libxml-2.0-uninstalled.pc.in \
trionan.c trionan.h triostr.c triostr.h trio.c trio.h \
- triop.h triodef.h libxml.h elfgcchack.h xzlib.c xzlib.h \
+ triop.h triodef.h libxml.h elfgcchack.h xzlib.h \
testThreadsWin32.c genUnicode.py TODO_SCHEMAS \
dbgen.pl dbgenattr.pl regressions.py regressions.xml \
README.tests Makefile.tests libxml2.syms \
diff --git a/libxml.spec.in b/libxml.spec.in
index 688811a..03eb24e 100644
--- a/libxml.spec.in
+++ b/libxml.spec.in
@@ -6,7 +6,7 @@ License: MIT
Group: Development/Libraries
Source: ftp://xmlsoft.org/libxml2/libxml2-%{version}.tar.gz
BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
-BuildRequires: python python-devel zlib-devel pkgconfig
+BuildRequires: python python-devel zlib-devel pkgconfig xz-devel
URL: http://xmlsoft.org/
%description
@@ -25,6 +25,7 @@ Summary: Libraries, includes, etc. to develop XML and HTML applications
Group: Development/Libraries
Requires: libxml2 = %{version}-%{release}
Requires: zlib-devel
+Requires: xz-devel
Requires: pkgconfig
%description devel
diff --git a/xmlIO.c b/xmlIO.c
index 4398791..73a995d 100644
--- a/xmlIO.c
+++ b/xmlIO.c
@@ -1315,7 +1315,7 @@ xmlGzfileClose (void * context) {
* I/O for compressed file accesses *
* *
************************************************************************/
-#include "xzlib.c"
+#include "xzlib.h"
/**
* xmlXzfileMatch:
* @filename: the URI for matching
@@ -1344,7 +1344,7 @@ xmlXzfileOpen_real (const char *filename) {
xzFile fd;
if (!strcmp(filename, "-")) {
- fd = xzdopen(dup(0), "rb");
+ fd = __libxml2_xzdopen(dup(0), "rb");
return((void *) fd);
}
@@ -1363,7 +1363,7 @@ xmlXzfileOpen_real (const char *filename) {
if (!xmlCheckFilename(path))
return(NULL);
- fd = xzopen(path, "rb");
+ fd = __libxml2_xzopen(path, "rb");
return((void *) fd);
}
@@ -1407,7 +1407,7 @@ static int
xmlXzfileRead (void * context, char * buffer, int len) {
int ret;
- ret = xzread((xzFile) context, &buffer[0], len);
+ ret = __libxml2_xzread((xzFile) context, &buffer[0], len);
if (ret < 0) xmlIOErr(0, "xzread()");
return(ret);
}
@@ -1422,7 +1422,7 @@ static int
xmlXzfileClose (void * context) {
int ret;
- ret = (xzclose((xzFile) context) == LZMA_OK ) ? 0 : -1;
+ ret = (__libxml2_xzclose((xzFile) context) == LZMA_OK ) ? 0 : -1;
if (ret < 0) xmlIOErr(0, "xzclose()");
return(ret);
}
diff --git a/xzlib.c b/xzlib.c
index ba3dbf3..192b164 100644
--- a/xzlib.c
+++ b/xzlib.c
@@ -1,43 +1,88 @@
+/**
+ * xzlib.c: front end for the transparent suport of lzma compression
+ * at the I/O layer, based on an example file from lzma project
+ *
+ * See Copyright for the status of this software.
+ *
+ * Anders F Bjorklund <afb users sourceforge net>
+ */
+#define IN_LIBXML
+#include "libxml.h"
+#ifdef HAVE_LZMA_H
+
+#include <string.h>
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+
+
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_ZLIB_H
+#include <zlib.h>
+#endif
+#include <lzma.h>
+
#include "xzlib.h"
/* values for xz_state how */
-#define LOOK 0 /* look for a gzip/lzma header */
-#define COPY 1 /* copy input directly */
-#define GZIP 2 /* decompress a gzip stream */
-#define LZMA 3 /* decompress a lzma stream */
+#define LOOK 0 /* look for a gzip/lzma header */
+#define COPY 1 /* copy input directly */
+#define GZIP 2 /* decompress a gzip stream */
+#define LZMA 3 /* decompress a lzma stream */
/* internal lzma file state data structure */
typedef struct {
- int mode; /* see lzma modes above */
- int fd; /* file descriptor */
- char *path; /* path or fd for error messages */
- uint64_t pos; /* current position in uncompressed data */
- unsigned size; /* buffer size, zero if not allocated yet */
- unsigned want; /* requested buffer size, default is BUFSIZ */
- unsigned char *in; /* input buffer */
- unsigned char *out; /* output buffer (double-sized when reading) */
- unsigned char *next; /* next output data to deliver or write */
- unsigned have; /* amount of output data unused at next */
- int eof; /* true if end of input file reached */
- uint64_t start; /* where the lzma data started, for rewinding */
- uint64_t raw; /* where the raw data started, for seeking */
- int how; /* 0: get header, 1: copy, 2: decompress */
- int direct; /* true if last read direct, false if lzma */
- /* seek request */
- uint64_t skip; /* amount to skip (already rewound if backwards) */
- int seek; /* true if seek request pending */
- /* error information */
- int err; /* error code */
- char *msg; /* error message */
- /* lzma stream */
- lzma_stream strm; /* stream structure in-place (not a pointer) */
+ int mode; /* see lzma modes above */
+ int fd; /* file descriptor */
+ char *path; /* path or fd for error messages */
+ uint64_t pos; /* current position in uncompressed data */
+ unsigned size; /* buffer size, zero if not allocated yet */
+ unsigned want; /* requested buffer size, default is BUFSIZ */
+ unsigned char *in; /* input buffer */
+ unsigned char *out; /* output buffer (double-sized when reading) */
+ unsigned char *next; /* next output data to deliver or write */
+ unsigned have; /* amount of output data unused at next */
+ int eof; /* true if end of input file reached */
+ uint64_t start; /* where the lzma data started, for rewinding */
+ uint64_t raw; /* where the raw data started, for seeking */
+ int how; /* 0: get header, 1: copy, 2: decompress */
+ int direct; /* true if last read direct, false if lzma */
+ /* seek request */
+ uint64_t skip; /* amount to skip (already rewound if backwards) */
+ int seek; /* true if seek request pending */
+ /* error information */
+ int err; /* error code */
+ char *msg; /* error message */
+ /* lzma stream */
+ lzma_stream strm; /* stream structure in-place (not a pointer) */
+ char padding1[32]; /* padding allowing to cope with possible
+ extensions of above structure without
+ too much side effect */
#ifdef HAVE_ZLIB_H
- /* zlib inflate or deflate stream */
- z_stream zstrm; /* stream structure in-place (not a pointer) */
+ /* zlib inflate or deflate stream */
+ z_stream zstrm; /* stream structure in-place (not a pointer) */
#endif
+ char padding2[32]; /* padding allowing to cope with possible
+ extensions of above structure without
+ too much side effect */
} xz_state, *xz_statep;
-static void xz_error(xz_statep state, int err, const char *msg)
+static void
+xz_error(xz_statep state, int err, const char *msg)
{
/* free previously allocated message and clear */
if (state->msg != NULL) {
@@ -53,14 +98,15 @@ static void xz_error(xz_statep state, int err, const char *msg)
/* for an out of memory error, save as static string */
if (err == LZMA_MEM_ERROR) {
- state->msg = (char *)msg;
+ state->msg = (char *) msg;
return;
}
/* construct error message with path */
- if ((state->msg = malloc(strlen(state->path) + strlen(msg) + 3)) == NULL) {
+ if ((state->msg =
+ malloc(strlen(state->path) + strlen(msg) + 3)) == NULL) {
state->err = LZMA_MEM_ERROR;
- state->msg = (char *)"out of memory";
+ state->msg = (char *) "out of memory";
return;
}
strcpy(state->msg, state->path);
@@ -69,22 +115,24 @@ static void xz_error(xz_statep state, int err, const char *msg)
return;
}
-static void xz_reset(xz_statep state)
+static void
+xz_reset(xz_statep state)
{
- state->have = 0; /* no output data available */
- state->eof = 0; /* not at end of file */
- state->how = LOOK; /* look for gzip header */
- state->direct = 1; /* default for empty file */
- state->seek = 0; /* no seek request pending */
- xz_error(state, LZMA_OK, NULL); /* clear error */
- state->pos = 0; /* no uncompressed data yet */
- state->strm.avail_in = 0; /* no input data yet */
+ state->have = 0; /* no output data available */
+ state->eof = 0; /* not at end of file */
+ state->how = LOOK; /* look for gzip header */
+ state->direct = 1; /* default for empty file */
+ state->seek = 0; /* no seek request pending */
+ xz_error(state, LZMA_OK, NULL); /* clear error */
+ state->pos = 0; /* no uncompressed data yet */
+ state->strm.avail_in = 0; /* no input data yet */
#ifdef HAVE_ZLIB_H
- state->zstrm.avail_in = 0; /* no input data yet */
+ state->zstrm.avail_in = 0; /* no input data yet */
#endif
}
-static xzFile xz_open(const char *path, int fd, const char *mode ATTRIBUTE_UNUSED)
+static xzFile
+xz_open(const char *path, int fd, const char *mode ATTRIBUTE_UNUSED)
{
xz_statep state;
@@ -96,7 +144,7 @@ static xzFile xz_open(const char *path, int fd, const char *mode ATTRIBUTE_UNUSE
state->want = BUFSIZ; /* requested buffer size */
state->msg = NULL; /* no error message yet */
- /* save the path name for error messages */
+ /* save the path name for error messages */
state->path = malloc(strlen(path) + 1);
if (state->path == NULL) {
free(state);
@@ -105,16 +153,14 @@ static xzFile xz_open(const char *path, int fd, const char *mode ATTRIBUTE_UNUSE
strcpy(state->path, path);
/* open the file with the appropriate mode (or just use fd) */
- state->fd = fd != -1 ? fd :
- open(path,
+ state->fd = fd != -1 ? fd : open(path,
#ifdef O_LARGEFILE
- O_LARGEFILE |
+ O_LARGEFILE |
#endif
#ifdef O_BINARY
- O_BINARY |
+ O_BINARY |
#endif
- O_RDONLY,
- 0666);
+ O_RDONLY, 0666);
if (state->fd == -1) {
free(state->path);
free(state);
@@ -123,34 +169,38 @@ static xzFile xz_open(const char *path, int fd, const char *mode ATTRIBUTE_UNUSE
/* save the current position for rewinding (only if reading) */
state->start = lseek(state->fd, 0, SEEK_CUR);
- if (state->start == (uint64_t) -1) state->start = 0;
+ if (state->start == (uint64_t) - 1)
+ state->start = 0;
/* initialize stream */
xz_reset(state);
/* return stream */
- return (xzFile)state;
+ return (xzFile) state;
}
-xzFile xzopen(const char *path, const char *mode)
+xzFile
+__libxml2_xzopen(const char *path, const char *mode)
{
return xz_open(path, -1, mode);
}
-xzFile xzdopen(int fd, const char *mode)
+xzFile
+__libxml2_xzdopen(int fd, const char *mode)
{
- char *path; /* identifier for error messages */
+ char *path; /* identifier for error messages */
xzFile xz;
if (fd == -1 || (path = malloc(7 + 3 * sizeof(int))) == NULL)
return NULL;
- sprintf(path, "<fd:%d>", fd); /* for debugging */
+ sprintf(path, "<fd:%d>", fd); /* for debugging */
xz = xz_open(path, fd, mode);
free(path);
return xz;
}
-static int xz_load(xz_statep state, unsigned char *buf, unsigned len, unsigned *have)
+static int
+xz_load(xz_statep state, unsigned char *buf, unsigned len, unsigned *have)
{
int ret;
@@ -170,7 +220,8 @@ static int xz_load(xz_statep state, unsigned char *buf, unsigned len, unsigned *
return 0;
}
-static int xz_avail(xz_statep state)
+static int
+xz_avail(xz_statep state)
{
lzma_stream *strm = &(state->strm);
@@ -178,7 +229,7 @@ static int xz_avail(xz_statep state)
return -1;
if (state->eof == 0) {
if (xz_load(state, state->in, state->size,
- (unsigned *)&(strm->avail_in)) == -1)
+ (unsigned *) &(strm->avail_in)) == -1)
return -1;
strm->next_in = state->in;
}
@@ -190,7 +241,7 @@ is_format_xz(xz_statep state)
{
lzma_stream *strm = &(state->strm);
- return strm->avail_in >= 6 && memcmp(state->in, "\3757zXZ", 6) == 0;
+ return strm->avail_in >= 6 && memcmp(state->in, "\3757zXZ", 6) == 0;
}
static int
@@ -198,56 +249,58 @@ is_format_lzma(xz_statep state)
{
lzma_stream *strm = &(state->strm);
- lzma_filter filter;
- lzma_options_lzma *opt;
- uint32_t dict_size;
- uint64_t uncompressed_size;
- size_t i;
-
- if (strm->avail_in < 13)
- return 0;
-
- filter.id = LZMA_FILTER_LZMA1;
- if (lzma_properties_decode(&filter, NULL, state->in, 5) != LZMA_OK)
- return 0;
-
- opt = filter.options;
- dict_size = opt->dict_size;
- free(opt);
-
- /* A hack to ditch tons of false positives: We allow only dictionary
- * sizes that are 2^n or 2^n + 2^(n-1) or UINT32_MAX. LZMA_Alone
- * created only files with 2^n, but accepts any dictionary size.
- * If someone complains, this will be reconsidered.
- */
- if (dict_size != UINT32_MAX) {
- uint32_t d = dict_size - 1;
- d |= d >> 2;
- d |= d >> 3;
- d |= d >> 4;
- d |= d >> 8;
- d |= d >> 16;
- ++d;
- if (d != dict_size || dict_size == 0)
- return 0;
- }
-
- /* Another hack to ditch false positives: Assume that if the
- * uncompressed size is known, it must be less than 256 GiB.
- * Again, if someone complains, this will be reconsidered.
- */
- uncompressed_size = 0;
- for (i = 0; i < 8; ++i)
- uncompressed_size |= (uint64_t)(state->in[5 + i]) << (i * 8);
-
- if (uncompressed_size != UINT64_MAX
- && uncompressed_size > (UINT64_C(1) << 38))
- return 0;
-
- return 1;
+ lzma_filter filter;
+ lzma_options_lzma *opt;
+ uint32_t dict_size;
+ uint64_t uncompressed_size;
+ size_t i;
+
+ if (strm->avail_in < 13)
+ return 0;
+
+ filter.id = LZMA_FILTER_LZMA1;
+ if (lzma_properties_decode(&filter, NULL, state->in, 5) != LZMA_OK)
+ return 0;
+
+ opt = filter.options;
+ dict_size = opt->dict_size;
+ free(opt);
+
+ /* A hack to ditch tons of false positives: We allow only dictionary
+ * sizes that are 2^n or 2^n + 2^(n-1) or UINT32_MAX. LZMA_Alone
+ * created only files with 2^n, but accepts any dictionary size.
+ * If someone complains, this will be reconsidered.
+ */
+ if (dict_size != UINT32_MAX) {
+ uint32_t d = dict_size - 1;
+
+ d |= d >> 2;
+ d |= d >> 3;
+ d |= d >> 4;
+ d |= d >> 8;
+ d |= d >> 16;
+ ++d;
+ if (d != dict_size || dict_size == 0)
+ return 0;
+ }
+
+ /* Another hack to ditch false positives: Assume that if the
+ * uncompressed size is known, it must be less than 256 GiB.
+ * Again, if someone complains, this will be reconsidered.
+ */
+ uncompressed_size = 0;
+ for (i = 0; i < 8; ++i)
+ uncompressed_size |= (uint64_t) (state->in[5 + i]) << (i * 8);
+
+ if (uncompressed_size != UINT64_MAX
+ && uncompressed_size > (UINT64_C(1) << 38))
+ return 0;
+
+ return 1;
}
#ifdef HAVE_ZLIB_H
+
/* Get next byte from input, or -1 if end or error. */
#define NEXT() ((strm->avail_in == 0 && xz_avail(state) == -1) ? -1 : \
(strm->avail_in == 0 ? -1 : \
@@ -255,25 +308,27 @@ is_format_lzma(xz_statep state)
/* Get a four-byte little-endian integer and return 0 on success and the value
in *ret. Otherwise -1 is returned and *ret is not modified. */
-static int gz_next4(xz_statep state, unsigned long *ret)
+static int
+gz_next4(xz_statep state, unsigned long *ret)
{
int ch;
unsigned long val;
z_streamp strm = &(state->zstrm);
val = NEXT();
- val += (unsigned)NEXT() << 8;
- val += (unsigned long)NEXT() << 16;
+ val += (unsigned) NEXT() << 8;
+ val += (unsigned long) NEXT() << 16;
ch = NEXT();
if (ch == -1)
return -1;
- val += (unsigned long)ch << 24;
+ val += (unsigned long) ch << 24;
*ret = val;
return 0;
}
#endif
-static int xz_head(xz_statep state)
+static int
+xz_head(xz_statep state)
{
lzma_stream *strm = &(state->strm);
lzma_stream init = LZMA_STREAM_INIT;
@@ -305,8 +360,7 @@ static int xz_head(xz_statep state)
state->size = 0;
xz_error(state, LZMA_MEM_ERROR, "out of memory");
return -1;
- }
-
+ }
#ifdef HAVE_ZLIB_H
/* allocate inflate memory */
state->zstrm.zalloc = Z_NULL;
@@ -314,7 +368,7 @@ static int xz_head(xz_statep state)
state->zstrm.opaque = Z_NULL;
state->zstrm.avail_in = 0;
state->zstrm.next_in = Z_NULL;
- if (inflateInit2(&(state->zstrm), -15) != Z_OK) { /* raw inflate */
+ if (inflateInit2(&(state->zstrm), -15) != Z_OK) { /* raw inflate */
free(state->out);
free(state->in);
state->size = 0;
@@ -332,15 +386,14 @@ static int xz_head(xz_statep state)
return 0;
}
- /* look for the xz magic header bytes */
+ /* look for the xz magic header bytes */
if (is_format_xz(state) || is_format_lzma(state)) {
- state->how = LZMA;
- state->direct = 0;
- return 0;
+ state->how = LZMA;
+ state->direct = 0;
+ return 0;
}
-
#ifdef HAVE_ZLIB_H
- /* look for the gzip magic header bytes 31 and 139 */
+ /* look for the gzip magic header bytes 31 and 139 */
if (strm->next_in[0] == 31) {
strm->avail_in--;
strm->next_in++;
@@ -352,40 +405,40 @@ static int xz_head(xz_statep state)
strm->next_in++;
/* skip rest of header */
- if (NEXT() != 8) { /* compression method */
- xz_error(state, LZMA_DATA_ERROR, "unknown compression method");
+ if (NEXT() != 8) { /* compression method */
+ xz_error(state, LZMA_DATA_ERROR,
+ "unknown compression method");
return -1;
}
flags = NEXT();
- if (flags & 0xe0) { /* reserved flag bits */
- xz_error(state, LZMA_DATA_ERROR, "unknown header flags set");
+ if (flags & 0xe0) { /* reserved flag bits */
+ xz_error(state, LZMA_DATA_ERROR,
+ "unknown header flags set");
return -1;
}
- NEXT(); /* modification time */
+ NEXT(); /* modification time */
NEXT();
NEXT();
NEXT();
- NEXT(); /* extra flags */
- NEXT(); /* operating system */
- if (flags & 4) { /* extra field */
- len = (unsigned)NEXT();
- len += (unsigned)NEXT() << 8;
+ NEXT(); /* extra flags */
+ NEXT(); /* operating system */
+ if (flags & 4) { /* extra field */
+ len = (unsigned) NEXT();
+ len += (unsigned) NEXT() << 8;
while (len--)
if (NEXT() < 0)
break;
}
- if (flags & 8) /* file name */
- while (NEXT() > 0)
- ;
- if (flags & 16) /* comment */
- while (NEXT() > 0)
- ;
- if (flags & 2) { /* header crc */
+ if (flags & 8) /* file name */
+ while (NEXT() > 0) ;
+ if (flags & 16) /* comment */
+ while (NEXT() > 0) ;
+ if (flags & 2) { /* header crc */
NEXT();
NEXT();
}
/* an unexpected end of file is not checked for here -- it will be
- noticed on the first request for uncompressed data */
+ * noticed on the first request for uncompressed data */
/* set up for decompression */
inflateReset(&state->zstrm);
@@ -393,8 +446,7 @@ static int xz_head(xz_statep state)
state->how = GZIP;
state->direct = 0;
return 0;
- }
- else {
+ } else {
/* not a gzip file -- save first byte (31) and fall to raw i/o */
state->out[0] = 31;
state->have = 1;
@@ -403,8 +455,8 @@ static int xz_head(xz_statep state)
#endif
/* doing raw i/o, save start of raw data for seeking, copy any leftover
- input to output -- this assumes that the output buffer is larger than
- the input buffer, which also assures space for gzungetc() */
+ * input to output -- this assumes that the output buffer is larger than
+ * the input buffer, which also assures space for gzungetc() */
state->raw = state->pos;
state->next = state->out;
if (strm->avail_in) {
@@ -417,7 +469,8 @@ static int xz_head(xz_statep state)
return 0;
}
-static int xz_decomp(xz_statep state)
+static int
+xz_decomp(xz_statep state)
{
int ret;
unsigned had;
@@ -438,31 +491,33 @@ static int xz_decomp(xz_statep state)
}
if (state->eof)
action = LZMA_FINISH;
-
+
/* decompress and handle errors */
#ifdef HAVE_ZLIB_H
if (state->how == GZIP) {
- state->zstrm.avail_in = (uInt) state->strm.avail_in;
- state->zstrm.next_in = (Bytef*) state->strm.next_in;
- state->zstrm.avail_out = (uInt) state->strm.avail_out;
- state->zstrm.next_out = (Bytef*) state->strm.next_out;
- ret = inflate(&state->zstrm, Z_NO_FLUSH);
- if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) {
- xz_error(state, Z_STREAM_ERROR,
- "internal error: inflate stream corrupt");
- return -1;
- }
- if (ret == Z_MEM_ERROR) ret = LZMA_MEM_ERROR;
- if (ret == Z_DATA_ERROR) ret = LZMA_DATA_ERROR;
- if (ret == Z_STREAM_END) ret = LZMA_STREAM_END;
- state->strm.avail_in = state->zstrm.avail_in;
- state->strm.next_in = state->zstrm.next_in;
- state->strm.avail_out = state->zstrm.avail_out;
- state->strm.next_out = state->zstrm.next_out;
- }
- else /* state->how == LZMA */
+ state->zstrm.avail_in = (uInt) state->strm.avail_in;
+ state->zstrm.next_in = (Bytef *) state->strm.next_in;
+ state->zstrm.avail_out = (uInt) state->strm.avail_out;
+ state->zstrm.next_out = (Bytef *) state->strm.next_out;
+ ret = inflate(&state->zstrm, Z_NO_FLUSH);
+ if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) {
+ xz_error(state, Z_STREAM_ERROR,
+ "internal error: inflate stream corrupt");
+ return -1;
+ }
+ if (ret == Z_MEM_ERROR)
+ ret = LZMA_MEM_ERROR;
+ if (ret == Z_DATA_ERROR)
+ ret = LZMA_DATA_ERROR;
+ if (ret == Z_STREAM_END)
+ ret = LZMA_STREAM_END;
+ state->strm.avail_in = state->zstrm.avail_in;
+ state->strm.next_in = state->zstrm.next_in;
+ state->strm.avail_out = state->zstrm.avail_out;
+ state->strm.next_out = state->zstrm.next_out;
+ } else /* state->how == LZMA */
#endif
- ret = lzma_code(strm, action);
+ ret = lzma_code(strm, action);
if (ret == LZMA_MEM_ERROR) {
xz_error(state, LZMA_MEM_ERROR, "out of memory");
return -1;
@@ -477,59 +532,60 @@ static int xz_decomp(xz_statep state)
state->have = had - strm->avail_out;
state->next = strm->next_out - state->have;
#ifdef HAVE_ZLIB_H
- state->zstrm.adler = crc32(state->zstrm.adler, state->next, state->have);
+ state->zstrm.adler =
+ crc32(state->zstrm.adler, state->next, state->have);
#endif
if (ret == LZMA_STREAM_END) {
#ifdef HAVE_ZLIB_H
if (state->how == GZIP) {
- if (gz_next4(state, &crc) == -1 || gz_next4(state, &len) == -1) {
- xz_error(state, LZMA_DATA_ERROR, "unexpected end of file");
- return -1;
- }
- if (crc != state->zstrm.adler) {
- xz_error(state, LZMA_DATA_ERROR, "incorrect data check");
- return -1;
- }
- if (len != (state->zstrm.total_out & 0xffffffffL)) {
- xz_error(state, LZMA_DATA_ERROR, "incorrect length check");
- return -1;
- }
- state->strm.avail_in = 0;
- state->strm.next_in = NULL;
- state->strm.avail_out = 0;
- state->strm.next_out = NULL;
- }
- else
+ if (gz_next4(state, &crc) == -1 || gz_next4(state, &len) == -1) {
+ xz_error(state, LZMA_DATA_ERROR, "unexpected end of file");
+ return -1;
+ }
+ if (crc != state->zstrm.adler) {
+ xz_error(state, LZMA_DATA_ERROR, "incorrect data check");
+ return -1;
+ }
+ if (len != (state->zstrm.total_out & 0xffffffffL)) {
+ xz_error(state, LZMA_DATA_ERROR, "incorrect length check");
+ return -1;
+ }
+ state->strm.avail_in = 0;
+ state->strm.next_in = NULL;
+ state->strm.avail_out = 0;
+ state->strm.next_out = NULL;
+ } else
#endif
- if ( strm->avail_in != 0 || !state->eof) {
+ if (strm->avail_in != 0 || !state->eof) {
xz_error(state, LZMA_DATA_ERROR, "trailing garbage");
return -1;
}
state->how = LOOK; /* ready for next stream, once have is 0 (leave
- state->direct unchanged to remember how) */
+ * state->direct unchanged to remember how) */
}
/* good decompression */
return 0;
}
-static int xz_make(xz_statep state)
+static int
+xz_make(xz_statep state)
{
lzma_stream *strm = &(state->strm);
- if (state->how == LOOK) { /* look for lzma / gzip header */
+ if (state->how == LOOK) { /* look for lzma / gzip header */
if (xz_head(state) == -1)
return -1;
- if (state->have) /* got some data from xz_head() */
+ if (state->have) /* got some data from xz_head() */
return 0;
}
- if (state->how == COPY) { /* straight copy */
- if (xz_load(state, state->out, state->size << 1, &(state->have)) == -1)
+ if (state->how == COPY) { /* straight copy */
+ if (xz_load(state, state->out, state->size << 1, &(state->have)) ==
+ -1)
return -1;
state->next = state->out;
- }
- else if (state->how == LZMA || state->how == GZIP) { /* decompress */
+ } else if (state->how == LZMA || state->how == GZIP) { /* decompress */
strm->avail_out = state->size << 1;
strm->next_out = state->out;
if (xz_decomp(state) == -1)
@@ -538,7 +594,8 @@ static int xz_make(xz_statep state)
return 0;
}
-static int xz_skip(xz_statep state, uint64_t len)
+static int
+xz_skip(xz_statep state, uint64_t len)
{
unsigned n;
@@ -546,19 +603,19 @@ static int xz_skip(xz_statep state, uint64_t len)
while (len)
/* skip over whatever is in output buffer */
if (state->have) {
- n = (uint64_t)state->have > len ?
- (unsigned)len : state->have;
+ n = (uint64_t) state->have > len ?
+ (unsigned) len : state->have;
state->have -= n;
state->next += n;
state->pos += n;
len -= n;
}
- /* output buffer empty -- return if we're at the end of the input */
+ /* output buffer empty -- return if we're at the end of the input */
else if (state->eof && state->strm.avail_in == 0)
break;
- /* need more data to skip -- load up output buffer */
+ /* need more data to skip -- load up output buffer */
else {
/* get more output, looking for header if required */
if (xz_make(state) == -1)
@@ -567,7 +624,8 @@ static int xz_skip(xz_statep state, uint64_t len)
return 0;
}
-int xzread(xzFile file, void *buf, unsigned len)
+int
+__libxml2_xzread(xzFile file, void *buf, unsigned len)
{
unsigned got, n;
xz_statep state;
@@ -576,7 +634,7 @@ int xzread(xzFile file, void *buf, unsigned len)
/* get internal structure */
if (file == NULL)
return -1;
- state = (xz_statep)file;
+ state = (xz_statep) file;
strm = &(state->strm);
/* check that we're reading and that there's no error */
@@ -584,9 +642,10 @@ int xzread(xzFile file, void *buf, unsigned len)
return -1;
/* since an int is returned, make sure len fits in one, otherwise return
- with an error (this avoids the flaw in the interface) */
- if ((int)len < 0) {
- xz_error(state, LZMA_BUF_ERROR, "requested length does not fit in int");
+ * with an error (this avoids the flaw in the interface) */
+ if ((int) len < 0) {
+ xz_error(state, LZMA_BUF_ERROR,
+ "requested length does not fit in int");
return -1;
}
@@ -617,24 +676,24 @@ int xzread(xzFile file, void *buf, unsigned len)
break;
/* need output data -- for small len or new stream load up our output
- buffer */
+ * buffer */
else if (state->how == LOOK || len < (state->size << 1)) {
/* get more output, looking for header if required */
if (xz_make(state) == -1)
return -1;
- continue; /* no progress yet -- go back to memcpy() above */
+ continue; /* no progress yet -- go back to memcpy() above */
/* the copy above assures that we will leave with space in the
- output buffer, allowing at least one gzungetc() to succeed */
+ * output buffer, allowing at least one gzungetc() to succeed */
}
/* large len -- read directly into user buffer */
- else if (state->how == COPY) { /* read directly */
+ else if (state->how == COPY) { /* read directly */
if (xz_load(state, buf, len, &n) == -1)
return -1;
}
/* large len -- decompress directly into user buffer */
- else { /* state->how == LZMA */
+ else { /* state->how == LZMA */
strm->avail_out = len;
strm->next_out = buf;
if (xz_decomp(state) == -1)
@@ -645,16 +704,17 @@ int xzread(xzFile file, void *buf, unsigned len)
/* update progress */
len -= n;
- buf = (char *)buf + n;
+ buf = (char *) buf + n;
got += n;
state->pos += n;
} while (len);
/* return number of bytes read into user buffer (will fit in int) */
- return (int)got;
+ return (int) got;
}
-int xzclose(xzFile file)
+int
+__libxml2_xzclose(xzFile file)
{
int ret;
xz_statep state;
@@ -662,7 +722,7 @@ int xzclose(xzFile file)
/* get internal structure */
if (file == NULL)
return LZMA_DATA_ERROR;
- state = (xz_statep)file;
+ state = (xz_statep) file;
/* free memory and close file */
if (state->size) {
@@ -678,4 +738,4 @@ int xzclose(xzFile file)
free(state);
return ret ? ret : LZMA_OK;
}
-
+#endif /* HAVE_LZMA_H */
diff --git a/xzlib.h b/xzlib.h
index 2adb7b3..43c75e1 100644
--- a/xzlib.h
+++ b/xzlib.h
@@ -1,6 +1,18 @@
-typedef void* xzFile; /* opaque lzma file descriptor */
+/**
+ * xzlib.h: header for the front end for the transparent suport of lzma
+ * compression at the I/O layer
+ *
+ * See Copyright for the status of this software.
+ *
+ * Anders F Bjorklund <afb users sourceforge net>
+ */
-static xzFile xzopen(const char *path, const char *mode);
-static xzFile xzdopen(int fd, const char *mode);
-static int xzread(xzFile file, void *buf, unsigned len);
-static int xzclose(xzFile file);
+#ifndef LIBXML2_XZLIB_H
+#define LIBXML2_XZLIB_H
+typedef void *xzFile; /* opaque lzma file descriptor */
+
+xzFile __libxml2_xzopen(const char *path, const char *mode);
+xzFile __libxml2_xzdopen(int fd, const char *mode);
+int __libxml2_xzread(xzFile file, void *buf, unsigned len);
+int __libxml2_xzclose(xzFile file);
+#endif /* LIBXML2_XZLIB_H */
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