thodg/libgit2

diff --git a/src/common.h b/src/common.h
index 287df60..addad6a 100644
--- a/src/common.h
+++ b/src/common.h
@@ -47,6 +47,7 @@ typedef SSIZE_T ssize_t;
 #endif
 
 #include "git2/common.h"
+#include "git2/compat.h"
 #include "util.h"
 #include "thread-utils.h"
 #include "bswap.h"
diff --git a/src/fileops.c b/src/fileops.c
index 68f45c2..1d680f3 100644
--- a/src/fileops.c
+++ b/src/fileops.c
@@ -89,7 +89,7 @@ int gitfo_exists(const char *path)
 	return access(path, F_OK);
 }
 
-off_t gitfo_size(git_file fd)
+git_off_t gitfo_size(git_file fd)
 {
 	struct stat sb;
 	if (gitfo_fstat(fd, &sb))
@@ -101,7 +101,7 @@ int gitfo_read_file(gitfo_buf *obj, const char *path)
 {
 	git_file fd;
 	size_t len;
-	off_t size;
+	git_off_t size;
 	unsigned char *buff;
 
 	assert(obj && path && *path);
@@ -155,7 +155,7 @@ int gitfo_move_file(char *from, char *to)
 	return GIT_EOSERR;
 }
 
-int gitfo_map_ro(git_map *out, git_file fd, off_t begin, size_t len)
+int gitfo_map_ro(git_map *out, git_file fd, git_off_t begin, size_t len)
 {
 	if (git__mmap(out, len, GIT_PROT_READ, GIT_MAP_SHARED, fd, begin) < GIT_SUCCESS)
 		return GIT_EOSERR;
diff --git a/src/fileops.h b/src/fileops.h
index 6656cdf..fa446e3 100644
--- a/src/fileops.h
+++ b/src/fileops.h
@@ -64,7 +64,7 @@ extern int gitfo_mkdir_recurs(const char *path, int mode);
 extern int gitfo_read(git_file fd, void *buf, size_t cnt);
 extern int gitfo_write(git_file fd, void *buf, size_t cnt);
 #define gitfo_lseek(f,n,w) lseek(f, n, w)
-extern off_t gitfo_size(git_file fd);
+extern git_off_t gitfo_size(git_file fd);
 
 extern int gitfo_read_file(gitfo_buf *obj, const char *path);
 extern void gitfo_free_buf(gitfo_buf *obj);
@@ -100,7 +100,7 @@ extern int gitfo_move_file(char *from, char *to);
 extern int gitfo_map_ro(
 	git_map *out,
 	git_file fd,
-	off_t begin,
+	git_off_t begin,
 	size_t len);
 
 /**
diff --git a/src/git2.h b/src/git2.h
index 9eb9294..fbd972b 100644
--- a/src/git2.h
+++ b/src/git2.h
@@ -27,6 +27,7 @@
 #define INCLUDE_git_git_h__
 
 #include "git2/common.h"
+#include "git2/compat.h"
 #include "git2/errors.h"
 #include "git2/zlib.h"
 
diff --git a/src/git2/compat.h b/src/git2/compat.h
new file mode 100644
index 0000000..76efae0
--- /dev/null
+++ b/src/git2/compat.h
@@ -0,0 +1,70 @@
+/*
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2,
+ * as published by the Free Software Foundation.
+ *
+ * In addition to the permissions in the GNU General Public License,
+ * the authors give you unlimited permission to link the compiled
+ * version of this file into combinations with other programs,
+ * and to distribute those combinations without any restriction
+ * coming from the use of this file.  (The General Public License
+ * restrictions do apply in other respects; for example, they cover
+ * modification of the file, and distribution when not linked into
+ * a combined executable.)
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+#ifndef INCLUDE_git_compat_h__
+#define INCLUDE_git_compat_h__
+
+/**
+ * @file git2/compat.h
+ * @brief Type compatibility layer necessary for clients of the library.
+ * @ingroup Git
+ * @{
+ */
+GIT_BEGIN_DECL
+
+// NOTE: This needs to be in a public header so that both the library
+// implementation and client applications both agree on the same types.
+// Otherwise we get undefined behavior.
+//
+// Use the "best" types that each platform provides. Currently we truncate
+// these intermediate representations for compatibility with the git ABI, but
+// if and when it changes to support 64 bit types, our code will naturally
+// adapt.
+//
+// NOTE: These types should match those that are returned by our internal
+// stat() functions, for all platforms.
+#if defined(_MSC_VER)
+
+typedef __int64 git_off_t;
+typedef __time64_t git_time_t;
+
+#elif defined(__MINGW32__)
+
+typedef off64_t git_off_t;
+typedef time_t git_time_t;
+
+#else  // POSIX
+
+// Note: Can't use off_t since if a client program includes <sys/types.h>
+// before us (directly or indirectly), they'll get 32 bit off_t in their client
+// app, even though /we/ define _FILE_OFFSET_BITS=64.
+typedef long long git_off_t;
+typedef time_t git_time_t;
+
+#endif
+
+/** @} */
+GIT_END_DECL
+
+#endif
diff --git a/src/git2/index.h b/src/git2/index.h
index f0cae09..f1716fe 100644
--- a/src/git2/index.h
+++ b/src/git2/index.h
@@ -45,7 +45,8 @@ GIT_BEGIN_DECL
 
 /** Time used in a git index entry */
 typedef struct {
-	unsigned int seconds;
+	git_time_t seconds;
+	/* nsec should not be stored as time_t compatible */
 	unsigned int nanoseconds;
 } git_index_time;
 
@@ -59,7 +60,7 @@ typedef struct git_index_entry {
 	unsigned int mode;
 	unsigned int uid;
 	unsigned int gid;
-	unsigned int file_size;
+	git_off_t file_size;
 
 	git_oid oid;
 
diff --git a/src/index.c b/src/index.c
index e861d79..6fdb46e 100644
--- a/src/index.c
+++ b/src/index.c
@@ -303,12 +303,8 @@ int git_index_add(git_index *index, const char *rel_path, int stage)
 
 	memset(&entry, 0x0, sizeof(git_index_entry));
 
-	/* Note: this won't wrap around at 2038 because we're not storing signed
-	 * 32-bit integers, but unsigned ones. We're converting from signed 64-bit
-	 * integers (on platforms that use 64bit time_t) to unsigned 32-bit integers,
-	 * which will represent up to 2^32 - 1 seconds after the epoch */
-	entry.ctime.seconds = (unsigned int)st.st_ctime;
-	entry.mtime.seconds = (unsigned int)st.st_mtime;
+	entry.ctime.seconds = st.st_ctime;
+	entry.mtime.seconds = st.st_mtime;
 	/* entry.mtime.nanoseconds = st.st_mtimensec; */
 	/* entry.ctime.nanoseconds = st.st_ctimensec; */
 	entry.dev= st.st_rdev;
@@ -316,8 +312,7 @@ int git_index_add(git_index *index, const char *rel_path, int stage)
 	entry.mode = st.st_mode;
 	entry.uid = st.st_uid;
 	entry.gid = st.st_gid;
-	/* Note: the following restricts blobs to 4GB in size */
-	entry.file_size = (unsigned int)st.st_size;
+	entry.file_size = st.st_size;
 
 	/* write the blob to disk and get the oid */
 	if ((error = git_blob_writefile(&entry.oid, index->repository, full_path)) < GIT_SUCCESS)
diff --git a/src/map.h b/src/map.h
index 3188ffd..be569ab 100644
--- a/src/map.h
+++ b/src/map.h
@@ -25,7 +25,7 @@ typedef struct {  /* memory mapped buffer   */
 #endif
 } git_map;
 
-extern int git__mmap(git_map *out, size_t len, int prot, int flags, int fd, off_t offset);
+extern int git__mmap(git_map *out, size_t len, int prot, int flags, int fd, git_off_t offset);
 extern int git__munmap(git_map *map);
 
 #endif /* INCLUDE_map_h__ */
diff --git a/src/mingw-compat.h b/src/mingw-compat.h
index e3805df..b7919c2 100644
--- a/src/mingw-compat.h
+++ b/src/mingw-compat.h
@@ -4,7 +4,6 @@
 #if defined(__MINGW32__)
 
 /* use a 64-bit file offset type */
-# define off_t off64_t
 # define lseek _lseeki64
 # define stat _stati64
 # define fstat _fstati64
diff --git a/src/msvc-compat.h b/src/msvc-compat.h
index 09492ba..d4c031d 100644
--- a/src/msvc-compat.h
+++ b/src/msvc-compat.h
@@ -8,9 +8,6 @@
 # define W_OK 2  /* write mode check */
 # define R_OK 4  /* read  mode check */
 
-/* use a 64-bit file offset type */
-typedef __int64 off64_t;
-# define off_t off64_t
 # define lseek _lseeki64
 # define stat _stat64
 # define fstat _fstat64
diff --git a/src/odb_pack.c b/src/odb_pack.c
index d59c419..6141c57 100644
--- a/src/odb_pack.c
+++ b/src/odb_pack.c
@@ -58,8 +58,8 @@ struct pack_backend;
 typedef struct {
 	uint32_t      n;
 	unsigned char *oid;
-	off_t         offset;
-	off_t         size;
+	git_off_t     offset;
+	git_off_t     size;
 } index_entry;
 
 typedef struct { /* '.pack' file header */
@@ -80,7 +80,7 @@ typedef struct git_pack {
 	int (*idx_search_offset)(
 		uint32_t *,
 		struct git_pack *,
-		off_t);
+		git_off_t);
 	int (*idx_get)(
 		index_entry *,
 		struct git_pack *,
@@ -107,7 +107,7 @@ typedef struct git_pack {
 	git_map pack_map;
 
 	/** The size of the .pack file. */
-	off_t pack_size;
+	git_off_t pack_size;
 
 	/** The mtime of the .pack file. */
 	time_t pack_mtime;
@@ -291,7 +291,7 @@ static int check_pack_hdr(git_pack *p)
 static int check_pack_sha1(git_pack *p)
 {
 	unsigned char *data = p->idx_map.data;
-	off_t pack_sha1_off = p->pack_size - GIT_OID_RAWSZ;
+	git_off_t pack_sha1_off = p->pack_size - GIT_OID_RAWSZ;
 	size_t idx_pack_sha1_off = p->idx_map.len - 2 * GIT_OID_RAWSZ;
 	git_oid pack_id, idx_pack_id;
 
@@ -550,7 +550,7 @@ static int locate_packfile(pack_location *location, pack_backend *backend, const
 static int pack_openidx_map(git_pack *p)
 {
 	char pb[GIT_PATH_MAX];
-	off_t len;
+	git_off_t len;
 
 	if (git__fmt(pb, sizeof(pb), "%s/pack/%s.idx",
 			p->backend->objects_dir,
@@ -571,7 +571,7 @@ static int pack_openidx_map(git_pack *p)
 }
 
 typedef struct {
-	off_t offset;
+	git_off_t offset;
 	uint32_t n;
 } offset_idx_info;
 
@@ -584,7 +584,7 @@ static int cmp_offset_idx_info(const void *lhs, const void *rhs)
 
 static int make_offset_index(git_pack *p, offset_idx_info *data)
 {
-	off_t min_off = 3 * 4, max_off = p->pack_size - GIT_OID_RAWSZ;
+	git_off_t min_off = 3 * 4, max_off = p->pack_size - GIT_OID_RAWSZ;
 	uint32_t *idx, *next;
 	uint32_t j;
 
@@ -636,7 +636,7 @@ static int idxv1_search(uint32_t *out, git_pack *p, const git_oid *id)
 	return GIT_ENOTFOUND;
 }
 
-static int idxv1_search_offset(uint32_t *out, git_pack *p, off_t offset)
+static int idxv1_search_offset(uint32_t *out, git_pack *p, git_off_t offset)
 {
 	if (offset > 0 && offset < (p->pack_size - GIT_OID_RAWSZ)) {
 		uint32_t lo = 0, hi = p->obj_cnt+1;
@@ -646,7 +646,7 @@ static int idxv1_search_offset(uint32_t *out, git_pack *p, off_t offset)
 			uint32_t mid = (lo + hi) >> 1;
 			uint32_t n = idx[mid];
 			uint32_t pos = n * (GIT_OID_RAWSZ + 4);
-			off_t here = decode32(data + pos);
+			git_off_t here = decode32(data + pos);
 			if (offset < here)
 				hi = mid;
 			else if (offset == here) {
@@ -666,7 +666,7 @@ static int idxv1_get(index_entry *e, git_pack *p, uint32_t n)
 
 	if (n < p->obj_cnt) {
 		uint32_t pos = n * (GIT_OID_RAWSZ + 4);
-		off_t next_off = p->pack_size - GIT_OID_RAWSZ;
+		git_off_t next_off = p->pack_size - GIT_OID_RAWSZ;
 		e->n = n;
 		e->oid = data + pos + 4;
 		e->offset = decode32(data + pos);
@@ -758,7 +758,7 @@ static int idxv2_search(uint32_t *out, git_pack *p, const git_oid *id)
 	return GIT_ENOTFOUND;
 }
 
-static int idxv2_search_offset(uint32_t *out, git_pack *p, off_t offset)
+static int idxv2_search_offset(uint32_t *out, git_pack *p, git_off_t offset)
 {
 	if (offset > 0 && offset < (p->pack_size - GIT_OID_RAWSZ)) {
 		uint32_t lo = 0, hi = p->obj_cnt+1;
@@ -767,7 +767,7 @@ static int idxv2_search_offset(uint32_t *out, git_pack *p, off_t offset)
 			uint32_t mid = (lo + hi) >> 1;
 			uint32_t n = idx[mid];
 			uint32_t o32 = decode32(p->im_offset32 + n);
-			off_t here = o32;
+			git_off_t here = o32;
 
 			if (o32 & 0x80000000) {
 				uint32_t o64_idx = (o32 & ~0x80000000);
@@ -793,7 +793,7 @@ static int idxv2_get(index_entry *e, git_pack *p, uint32_t n)
 
 	if (n < p->obj_cnt) {
 		uint32_t o32 = decode32(p->im_offset32 + n);
-		off_t next_off = p->pack_size - GIT_OID_RAWSZ;
+		git_off_t next_off = p->pack_size - GIT_OID_RAWSZ;
 		e->n = n;
 		e->oid = data + n * GIT_OID_RAWSZ;
 		e->offset = o32;
@@ -863,7 +863,7 @@ static int pack_openidx_v2(git_pack *p)
 	o64_len = o64_sz / 8;
 	for (j = 0; j < p->obj_cnt; j++) {
 		uint32_t o32 = decode32(p->im_offset32 + j);
-		off_t offset = o32;
+		git_off_t offset = o32;
 		if (o32 & 0x80000000) {
 			uint32_t o64_idx = (o32 & ~0x80000000);
 			if (o64_idx >= o64_len) {
@@ -992,7 +992,7 @@ static int unpack_object(git_rawobj *out, git_pack *p, index_entry *e)
 
 		case GIT_OBJ_OFS_DELTA: {
 
-			off_t delta_offset;
+			git_off_t delta_offset;
 			index_entry entry;
 
 			byte = *buffer++ & 0xFF;
diff --git a/src/unix/map.c b/src/unix/map.c
index 3008008..4780bd2 100644
--- a/src/unix/map.c
+++ b/src/unix/map.c
@@ -4,7 +4,7 @@
 #include <errno.h>
 
 
-int git__mmap(git_map *out, size_t len, int prot, int flags, int fd, off_t offset)
+int git__mmap(git_map *out, size_t len, int prot, int flags, int fd, git_off_t offset)
 {
 	int mprot = 0;
 	int mflag = 0;
diff --git a/src/util.h b/src/util.h
index 5e6c7d2..99c4f5a 100644
--- a/src/util.h
+++ b/src/util.h
@@ -27,10 +27,10 @@ extern uint32_t git__hash(const void *key, int len, uint32_t seed);
 
 
 /** @return true if p fits into the range of a size_t */
-GIT_INLINE(int) git__is_sizet(off_t p)
+GIT_INLINE(int) git__is_sizet(git_off_t p)
 {
 	size_t r = (size_t)p;
-	return p == (off_t)r;
+	return p == (git_off_t)r;
 }
 
 /* 32-bit cross-platform rotl */
diff --git a/src/win32/map.c b/src/win32/map.c
index 388e9c6..e5f8e55 100644
--- a/src/win32/map.c
+++ b/src/win32/map.c
@@ -16,7 +16,7 @@ static DWORD get_page_size(void)
 	return page_size;
 }
 
-int git__mmap(git_map *out, size_t len, int prot, int flags, int fd, off_t offset)
+int git__mmap(git_map *out, size_t len, int prot, int flags, int fd, git_off_t offset)
 {
 	HANDLE fh = (HANDLE)_get_osfhandle(fd);
 	DWORD page_size = get_page_size();
@@ -24,8 +24,8 @@ int git__mmap(git_map *out, size_t len, int prot, int flags, int fd, off_t offse
 	DWORD view_prot = 0;
 	DWORD off_low = 0;
 	DWORD off_hi  = 0;
-	off_t page_start;
-	off_t page_offset;
+	git_off_t page_start;
+	git_off_t page_offset;
 
 	assert((out != NULL) && (len > 0));
 
@@ -77,7 +77,7 @@ int git__mmap(git_map *out, size_t len, int prot, int flags, int fd, off_t offse
 		return GIT_ERROR;
 	}
 
-	assert(sizeof(off_t) == 8);
+	assert(sizeof(git_off_t) == 8);
 	off_low = (DWORD)(page_start);
 	off_hi = (DWORD)(page_start >> 32);
 	out->data = MapViewOfFile(out->fmh, view_prot, off_hi, off_low, len);