[PATCH v4 07/19] Provide zlib's uncompress2 from compat/zlib-compat.c
From: Han-Wen Nienhuys <hanwen@google.com>
This will be needed for reading reflog blocks in reftable.
Helped-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
---
Makefile | 7 +++
ci/lib.sh | 1 +
compat/.gitattributes | 1 +
compat/zlib-uncompress2.c | 95 +++++++++++++++++++++++++++++++++++++++
config.mak.uname | 5 +++
configure.ac | 13 ++++++
6 files changed, 122 insertions(+)
create mode 100644 compat/.gitattributes
create mode 100644 compat/zlib-uncompress2.c
diff --git a/Makefile b/Makefile
index b57b2b0e78e..9dfab70f79b 100644
--- a/Makefile
+++ b/Makefile
@@ -256,6 +256,8 @@ all::
#
# Define NO_DEFLATE_BOUND if your zlib does not have deflateBound.
#
+# Define NO_UNCOMPRESS2 if your zlib does not have uncompress2.
+#
# Define NO_NORETURN if using buggy versions of gcc 4.6+ and profile feedback,
# as the compiler can crash (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49299)
#
@@ -1718,6 +1720,11 @@ ifdef NO_DEFLATE_BOUND
BASIC_CFLAGS += -DNO_DEFLATE_BOUND
endif
+ifdef NO_UNCOMPRESS2
+ BASIC_CFLAGS += -DNO_UNCOMPRESS2
+ REFTABLE_OBJS += compat/zlib-uncompress2.o
+endif
+
ifdef NO_POSIX_GOODIES
BASIC_CFLAGS += -DNO_POSIX_GOODIES
endif
diff --git a/ci/lib.sh b/ci/lib.sh
index 476c3f369f5..5711c63979d 100755
--- a/ci/lib.sh
+++ b/ci/lib.sh
@@ -224,6 +224,7 @@ linux-gcc-default)
;;
Linux32)
CC=gcc
+ MAKEFLAGS="$MAKEFLAGS NO_UNCOMPRESS2=1"
;;
linux-musl)
CC=gcc
diff --git a/compat/.gitattributes b/compat/.gitattributes
new file mode 100644
index 00000000000..40dbfb170da
--- /dev/null
+++ b/compat/.gitattributes
@@ -0,0 +1 @@
+/zlib-uncompress2.c whitespace=-indent-with-non-tab,-trailing-space
diff --git a/compat/zlib-uncompress2.c b/compat/zlib-uncompress2.c
new file mode 100644
index 00000000000..3dcb90b2839
--- /dev/null
+++ b/compat/zlib-uncompress2.c
@@ -0,0 +1,95 @@
+/* taken from zlib's uncompr.c
+
+ commit cacf7f1d4e3d44d871b605da3b647f07d718623f
+ Author: Mark Adler <madler@alumni.caltech.edu>
+ Date: Sun Jan 15 09:18:46 2017 -0800
+
+ zlib 1.2.11
+
+*/
+
+#include "../reftable/system.h"
+#define z_const
+
+/*
+ * Copyright (C) 1995-2003, 2010, 2014, 2016 Jean-loup Gailly, Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include <zlib.h>
+
+/* clang-format off */
+
+/* ===========================================================================
+ Decompresses the source buffer into the destination buffer. *sourceLen is
+ the byte length of the source buffer. Upon entry, *destLen is the total size
+ of the destination buffer, which must be large enough to hold the entire
+ uncompressed data. (The size of the uncompressed data must have been saved
+ previously by the compressor and transmitted to the decompressor by some
+ mechanism outside the scope of this compression library.) Upon exit,
+ *destLen is the size of the decompressed data and *sourceLen is the number
+ of source bytes consumed. Upon return, source + *sourceLen points to the
+ first unused input byte.
+
+ uncompress returns Z_OK if success, Z_MEM_ERROR if there was not enough
+ memory, Z_BUF_ERROR if there was not enough room in the output buffer, or
+ Z_DATA_ERROR if the input data was corrupted, including if the input data is
+ an incomplete zlib stream.
+*/
+int ZEXPORT uncompress2 (
+ Bytef *dest,
+ uLongf *destLen,
+ const Bytef *source,
+ uLong *sourceLen) {
+ z_stream stream;
+ int err;
+ const uInt max = (uInt)-1;
+ uLong len, left;
+ Byte buf[1]; /* for detection of incomplete stream when *destLen == 0 */
+
+ len = *sourceLen;
+ if (*destLen) {
+ left = *destLen;
+ *destLen = 0;
+ }
+ else {
+ left = 1;
+ dest = buf;
+ }
+
+ stream.next_in = (z_const Bytef *)source;
+ stream.avail_in = 0;
+ stream.zalloc = (alloc_func)0;
+ stream.zfree = (free_func)0;
+ stream.opaque = (voidpf)0;
+
+ err = inflateInit(&stream);
+ if (err != Z_OK) return err;
+
+ stream.next_out = dest;
+ stream.avail_out = 0;
+
+ do {
+ if (stream.avail_out == 0) {
+ stream.avail_out = left > (uLong)max ? max : (uInt)left;
+ left -= stream.avail_out;
+ }
+ if (stream.avail_in == 0) {
+ stream.avail_in = len > (uLong)max ? max : (uInt)len;
+ len -= stream.avail_in;
+ }
+ err = inflate(&stream, Z_NO_FLUSH);
+ } while (err == Z_OK);
+
+ *sourceLen -= len + stream.avail_in;
+ if (dest != buf)
+ *destLen = stream.total_out;
+ else if (stream.total_out && err == Z_BUF_ERROR)
+ left = 1;
+
+ inflateEnd(&stream);
+ return err == Z_STREAM_END ? Z_OK :
+ err == Z_NEED_DICT ? Z_DATA_ERROR :
+ err == Z_BUF_ERROR && left + stream.avail_out ? Z_DATA_ERROR :
+ err;
+}
diff --git a/config.mak.uname b/config.mak.uname
index 76516aaa9a5..9399247cbb3 100644
--- a/config.mak.uname
+++ b/config.mak.uname
@@ -258,6 +258,10 @@ ifeq ($(uname_S),FreeBSD)
FILENO_IS_A_MACRO = UnfortunatelyYes
endif
ifeq ($(uname_S),OpenBSD)
+ # Versions < 7.0 need compatibility layer
+ ifeq ($(shell expr "$(uname_R)" : "[1-6]\."),2)
+ NO_UNCOMPRESS2 = UnfortunatelyYes
+ endif
NO_STRCASESTR = YesPlease
NO_MEMMEM = YesPlease
USE_ST_TIMESPEC = YesPlease
@@ -513,6 +517,7 @@ ifeq ($(uname_S),Interix)
endif
endif
ifeq ($(uname_S),Minix)
+ NO_UNCOMPRESS2 = YesPlease
NO_IPV6 = YesPlease
NO_ST_BLOCKS_IN_STRUCT_STAT = YesPlease
NO_NSEC = YesPlease
diff --git a/configure.ac b/configure.ac
index 031e8d3fee8..c3a913103d0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -672,9 +672,22 @@ AC_LINK_IFELSE([ZLIBTEST_SRC],
NO_DEFLATE_BOUND=yes])
LIBS="$old_LIBS"
+AC_DEFUN([ZLIBTEST_UNCOMPRESS2_SRC], [
+AC_LANG_PROGRAM([#include <zlib.h>],
+ [uncompress2(NULL,NULL,NULL,NULL);])])
+AC_MSG_CHECKING([for uncompress2 in -lz])
+old_LIBS="$LIBS"
+LIBS="$LIBS -lz"
+AC_LINK_IFELSE([ZLIBTEST_UNCOMPRESS2_SRC],
+ [AC_MSG_RESULT([yes])],
+ [AC_MSG_RESULT([no])
+ NO_UNCOMPRESS2=yes])
+LIBS="$old_LIBS"
+
GIT_UNSTASH_FLAGS($ZLIB_PATH)
GIT_CONF_SUBST([NO_DEFLATE_BOUND])
+GIT_CONF_SUBST([NO_UNCOMPRESS2])
#
# Define NEEDS_SOCKET if linking with libc is not enough (SunOS,
--
gitgitgadget
Han-Wen Nienhuys via GitGitGadget <gitgitgadget@gmail.com>