thodg/libgit2

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6e633f1..292fadd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -239,10 +239,22 @@ ELSE ()
 	ENABLE_WARNINGS(shift-count-overflow)
 	ENABLE_WARNINGS(unused-const-variable)
 	ENABLE_WARNINGS(unused-function)
-	ENABLE_WARNINGS(format)
-	ENABLE_WARNINGS(format-security)
 	ENABLE_WARNINGS(int-conversion)
-	DISABLE_WARNINGS(documentation-deprecated-sync)
+
+	# MinGW uses gcc, which expects POSIX formatting for printf, but
+	# uses the Windows C library, which uses its own format specifiers.
+	# Disable format specifier warnings.
+	IF(MINGW)
+		DISABLE_WARNINGS(format)
+		DISABLE_WARNINGS(format-security)
+	ELSE()
+		ENABLE_WARNINGS(format)
+		ENABLE_WARNINGS(format-security)
+	ENDIF()
+
+	IF("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang")
+		DISABLE_WARNINGS(documentation-deprecated-sync)
+	ENDIF()
 
 	IF (PROFILE)
 		SET(CMAKE_C_FLAGS "-pg ${CMAKE_C_FLAGS}")
diff --git a/cmake/Modules/EnableWarnings.cmake b/cmake/Modules/EnableWarnings.cmake
index 72e1523..b61ed7e 100644
--- a/cmake/Modules/EnableWarnings.cmake
+++ b/cmake/Modules/EnableWarnings.cmake
@@ -7,5 +7,9 @@ MACRO(DISABLE_WARNINGS flag)
 ENDMACRO()
 
 IF(ENABLE_WERROR)
-	ADD_C_FLAG_IF_SUPPORTED(-Werror)
+	IF(MSVC)
+		ADD_COMPILE_OPTIONS(-WX)
+	ELSE()
+		ADD_C_FLAG_IF_SUPPORTED(-Werror)
+	ENDIF()
 ENDIF()
diff --git a/deps/http-parser/http_parser.c b/deps/http-parser/http_parser.c
index cc53a52..1bcd330 100644
--- a/deps/http-parser/http_parser.c
+++ b/deps/http-parser/http_parser.c
@@ -1992,6 +1992,9 @@ http_parse_host(const char * buf, struct http_parser_url *u, int found_at) {
   const char *p;
   size_t buflen = u->field_data[UF_HOST].off + u->field_data[UF_HOST].len;
 
+  if (buflen > UINT16_MAX)
+    return 1;
+
   u->field_data[UF_HOST].len = 0;
 
   s = found_at ? s_http_userinfo_start : s_http_host_start;
@@ -2006,21 +2009,21 @@ http_parse_host(const char * buf, struct http_parser_url *u, int found_at) {
     switch(new_s) {
       case s_http_host:
         if (s != s_http_host) {
-          u->field_data[UF_HOST].off = p - buf;
+          u->field_data[UF_HOST].off = (uint16_t)(p - buf);
         }
         u->field_data[UF_HOST].len++;
         break;
 
       case s_http_host_v6:
         if (s != s_http_host_v6) {
-          u->field_data[UF_HOST].off = p - buf;
+          u->field_data[UF_HOST].off = (uint16_t)(p - buf);
         }
         u->field_data[UF_HOST].len++;
         break;
 
       case s_http_host_port:
         if (s != s_http_host_port) {
-          u->field_data[UF_PORT].off = p - buf;
+          u->field_data[UF_PORT].off = (uint16_t)(p - buf);
           u->field_data[UF_PORT].len = 0;
           u->field_set |= (1 << UF_PORT);
         }
@@ -2029,7 +2032,7 @@ http_parse_host(const char * buf, struct http_parser_url *u, int found_at) {
 
       case s_http_userinfo:
         if (s != s_http_userinfo) {
-          u->field_data[UF_USERINFO].off = p - buf ;
+          u->field_data[UF_USERINFO].off = (uint16_t)(p - buf);
           u->field_data[UF_USERINFO].len = 0;
           u->field_set |= (1 << UF_USERINFO);
         }
@@ -2066,6 +2069,9 @@ http_parser_parse_url(const char *buf, size_t buflen, int is_connect,
   enum http_parser_url_fields uf, old_uf;
   int found_at = 0;
 
+  if (buflen > UINT16_MAX)
+    return 1;
+
   u->port = u->field_set = 0;
   s = is_connect ? s_req_server_start : s_req_spaces_before_url;
   uf = old_uf = UF_MAX;
@@ -2121,7 +2127,7 @@ http_parser_parse_url(const char *buf, size_t buflen, int is_connect,
       continue;
     }
 
-    u->field_data[uf].off = p - buf;
+    u->field_data[uf].off = (uint16_t)(p - buf);
     u->field_data[uf].len = 1;
 
     u->field_set |= (1 << uf);
diff --git a/deps/zlib/adler32.c b/deps/zlib/adler32.c
index d0be438..444a5a8 100644
--- a/deps/zlib/adler32.c
+++ b/deps/zlib/adler32.c
@@ -177,10 +177,3 @@ uLong ZEXPORT adler32_combine(adler1, adler2, len2)
     return adler32_combine_(adler1, adler2, len2);
 }
 
-uLong ZEXPORT adler32_combine64(adler1, adler2, len2)
-    uLong adler1;
-    uLong adler2;
-    z_off64_t len2;
-{
-    return adler32_combine_(adler1, adler2, len2);
-}
diff --git a/deps/zlib/crc32.c b/deps/zlib/crc32.c
index 9580440..1ee0284 100644
--- a/deps/zlib/crc32.c
+++ b/deps/zlib/crc32.c
@@ -433,10 +433,3 @@ uLong ZEXPORT crc32_combine(crc1, crc2, len2)
     return crc32_combine_(crc1, crc2, len2);
 }
 
-uLong ZEXPORT crc32_combine64(crc1, crc2, len2)
-    uLong crc1;
-    uLong crc2;
-    z_off64_t len2;
-{
-    return crc32_combine_(crc1, crc2, len2);
-}
diff --git a/include/git2/tree.h b/include/git2/tree.h
index aca5d75..4455d2e 100644
--- a/include/git2/tree.h
+++ b/include/git2/tree.h
@@ -267,7 +267,7 @@ GIT_EXTERN(void) git_treebuilder_clear(git_treebuilder *bld);
  * @param bld a previously loaded treebuilder.
  * @return the number of entries in the treebuilder
  */
-GIT_EXTERN(unsigned int) git_treebuilder_entrycount(git_treebuilder *bld);
+GIT_EXTERN(size_t) git_treebuilder_entrycount(git_treebuilder *bld);
 
 /**
  * Free a tree builder
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 7ab1832..750085b 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -314,12 +314,20 @@ ELSE()
 	ENDIF()
 	FILE(GLOB SRC_OS unix/*.c unix/*.h)
 ENDIF()
+
 FILE(GLOB SRC_GIT2 *.c *.h
 	allocators/*.c allocators/*.h
 	streams/*.c streams/*.h
 	transports/*.c transports/*.h
 	xdiff/*.c xdiff/*.h)
 
+# the xdiff dependency is not (yet) warning-free, disable warnings as
+# errors for the xdiff sources until we've sorted them out
+IF(MSVC)
+	SET_SOURCE_FILES_PROPERTIES(xdiff/xdiffi.c PROPERTIES COMPILE_FLAGS -WX-)
+	SET_SOURCE_FILES_PROPERTIES(xdiff/xutils.c PROPERTIES COMPILE_FLAGS -WX-)
+ENDIF()
+
 # Determine architecture of the machine
 IF (CMAKE_SIZEOF_VOID_P EQUAL 8)
 	SET(GIT_ARCH_64 1)
diff --git a/src/attrcache.c b/src/attrcache.c
index 00e4596..b88bc09 100644
--- a/src/attrcache.c
+++ b/src/attrcache.c
@@ -54,7 +54,7 @@ int git_attr_cache__alloc_file_entry(
 			cachesize++;
 	}
 
-	ce = git_pool_mallocz(pool, (uint32_t)cachesize);
+	ce = git_pool_mallocz(pool, cachesize);
 	GIT_ERROR_CHECK_ALLOC(ce);
 
 	if (baselen) {
diff --git a/src/commit_list.c b/src/commit_list.c
index 5496dca..44673d9 100644
--- a/src/commit_list.c
+++ b/src/commit_list.c
@@ -73,7 +73,7 @@ static git_commit_list_node **alloc_parents(
 		return (git_commit_list_node **)((char *)commit + sizeof(git_commit_list_node));
 
 	return (git_commit_list_node **)git_pool_malloc(
-		&walk->commit_pool, (uint32_t)(n_parents * sizeof(git_commit_list_node *)));
+		&walk->commit_pool, (n_parents * sizeof(git_commit_list_node *)));
 }
 
 
diff --git a/src/config_parse.c b/src/config_parse.c
index 64d9a69..46dce40 100644
--- a/src/config_parse.c
+++ b/src/config_parse.c
@@ -88,6 +88,11 @@ static int parse_subsection_header(git_config_parser *reader, const char *line, 
 	last_quote = strrchr(line, '"');
 	quoted_len = last_quote - first_quote;
 
+	if ((last_quote - line) > INT_MAX) {
+		set_parse_error(reader, 0, "invalid section header, line too long");
+		goto end_error;
+	}
+
 	if (quoted_len == 0) {
 		set_parse_error(reader, 0, "missing closing quotation mark in section header");
 		goto end_error;
@@ -146,7 +151,7 @@ end_parse:
 	}
 
 	*section_name = git_buf_detach(&buf);
-	return &line[rpos + 2] - line_start; /* rpos is at the closing quote */
+	return (int)(&line[rpos + 2] - line_start); /* rpos is at the closing quote */
 
 end_error:
 	git_buf_dispose(&buf);
diff --git a/src/fileops.c b/src/fileops.c
index a4d5cc6..0b732aa 100644
--- a/src/fileops.c
+++ b/src/fileops.c
@@ -636,9 +636,7 @@ retry_lstat:
 			size_t alloc_size;
 
 			GIT_ERROR_CHECK_ALLOC_ADD(&alloc_size, make_path.size, 1);
-			if (!git__is_uint32(alloc_size))
-				return -1;
-			cache_path = git_pool_malloc(opts->pool, (uint32_t)alloc_size);
+			cache_path = git_pool_malloc(opts->pool, alloc_size);
 			GIT_ERROR_CHECK_ALLOC(cache_path);
 
 			memcpy(cache_path, make_path.ptr, make_path.size + 1);
diff --git a/src/idxmap.c b/src/idxmap.c
index e75887c..4dcf963 100644
--- a/src/idxmap.c
+++ b/src/idxmap.c
@@ -70,7 +70,8 @@ void git_idxmap_icase_clear(git_idxmap_icase *map)
 
 int git_idxmap_resize(git_idxmap *map, size_t size)
 {
-	if (kh_resize(idx, map, size) < 0) {
+	if (!git__is_uint32(size) ||
+	    kh_resize(idx, map, (khiter_t)size) < 0) {
 		git_error_set_oom();
 		return -1;
 	}
@@ -79,7 +80,8 @@ int git_idxmap_resize(git_idxmap *map, size_t size)
 
 int git_idxmap_icase_resize(git_idxmap_icase *map, size_t size)
 {
-	if (kh_resize(idxicase, map, size) < 0) {
+	if (!git__is_uint32(size) ||
+	    kh_resize(idxicase, map, (khiter_t)size) < 0) {
 		git_error_set_oom();
 		return -1;
 	}
diff --git a/src/index.c b/src/index.c
index 482728d..0c90173 100644
--- a/src/index.c
+++ b/src/index.c
@@ -1474,6 +1474,11 @@ int git_index_add_from_buffer(
 		return -1;
 	}
 
+	if (len > UINT32_MAX) {
+		git_error_set(GIT_ERROR_INDEX, "buffer is too large");
+		return -1;
+	}
+
 	if (index_entry_dup(&entry, index, source_entry) < 0)
 		return -1;
 
@@ -1484,7 +1489,7 @@ int git_index_add_from_buffer(
 	}
 
 	git_oid_cpy(&entry->id, &id);
-	entry->file_size = len;
+	entry->file_size = (uint32_t)len;
 
 	if ((error = index_insert(index, &entry, 1, true, true, true)) < 0)
 		return error;
diff --git a/src/merge.c b/src/merge.c
index ec34ccb..c1f1cc4 100644
--- a/src/merge.c
+++ b/src/merge.c
@@ -867,7 +867,7 @@ static int merge_conflict_invoke_driver(
 
 	git_oid_cpy(&result->id, &oid);
 	result->mode = mode;
-	result->file_size = buf.size;
+	result->file_size = (uint32_t)buf.size;
 
 	result->path = git_pool_strdup(&diff_list->pool, path);
 	GIT_ERROR_CHECK_ALLOC(result->path);
diff --git a/src/netops.c b/src/netops.c
index 708f694..f19bae9 100644
--- a/src/netops.c
+++ b/src/netops.c
@@ -37,14 +37,17 @@ void gitno_buffer_setup_callback(
 static int recv_stream(gitno_buffer *buf)
 {
 	git_stream *io = (git_stream *) buf->cb_data;
-	int ret;
+	size_t readlen = buf->len - buf->offset;
+	ssize_t ret;
 
-	ret = git_stream_read(io, buf->data + buf->offset, buf->len - buf->offset);
+	readlen = min(readlen, INT_MAX);
+
+	ret = git_stream_read(io, buf->data + buf->offset, (int)readlen);
 	if (ret < 0)
 		return -1;
 
 	buf->offset += ret;
-	return ret;
+	return (int)ret;
 }
 
 void gitno_buffer_setup_fromstream(git_stream *st, gitno_buffer *buf, char *data, size_t len)
diff --git a/src/odb_loose.c b/src/odb_loose.c
index 5bdf884..4b249b6 100644
--- a/src/odb_loose.c
+++ b/src/odb_loose.c
@@ -408,7 +408,8 @@ done:
 static int read_header_loose(git_rawobj *out, git_buf *loc)
 {
 	unsigned char obj[1024];
-	int fd, obj_len, error;
+	ssize_t obj_len;
+	int fd, error;
 
 	assert(out && loc);
 
@@ -417,10 +418,14 @@ static int read_header_loose(git_rawobj *out, git_buf *loc)
 
 	out->data = NULL;
 
-	if ((error = fd = git_futils_open_ro(loc->ptr)) < 0 ||
-		(error = obj_len = p_read(fd, obj, sizeof(obj))) < 0)
+	if ((error = fd = git_futils_open_ro(loc->ptr)) < 0)
 		goto done;
 
+	if ((obj_len = p_read(fd, obj, sizeof(obj))) < 0) {
+		error = (int)obj_len;
+		goto done;
+	}
+
 	if (!is_zlib_compressed_data(obj, (size_t)obj_len))
 		error = read_header_loose_packlike(out, obj, (size_t)obj_len);
 	else
@@ -871,6 +876,8 @@ static int loose_backend__readstream_read(
 	size_t start_remain = stream->start_len - stream->start_read;
 	int total = 0, error;
 
+	buffer_len = min(buffer_len, INT_MAX);
+
 	/*
 	 * if we read more than just the header in the initial read, play
 	 * that back for the caller.
@@ -882,20 +889,20 @@ static int loose_backend__readstream_read(
 		buffer += chunk;
 		stream->start_read += chunk;
 
-		total += chunk;
+		total += (int)chunk;
 		buffer_len -= chunk;
 	}
 
 	if (buffer_len) {
-		size_t chunk = min(buffer_len, INT_MAX);
+		size_t chunk = buffer_len;
 
 		if ((error = git_zstream_get_output(buffer, &chunk, &stream->zstream)) < 0)
 			return error;
 
-		total += chunk;
+		total += (int)chunk;
 	}
 
-	return total;
+	return (int)total;
 }
 
 static void loose_backend__readstream_free(git_odb_stream *_stream)
diff --git a/src/patch_parse.c b/src/patch_parse.c
index d731115..b44d4f0 100644
--- a/src/patch_parse.c
+++ b/src/patch_parse.c
@@ -33,7 +33,7 @@ typedef struct {
 	char *old_prefix, *new_prefix;
 } git_patch_parsed;
 
-static int header_path_len(git_patch_parse_ctx *ctx)
+static size_t header_path_len(git_patch_parse_ctx *ctx)
 {
 	bool inquote = 0;
 	bool quoted = git_parse_ctx_contains_s(&ctx->parse_ctx, "\"");
diff --git a/src/path.c b/src/path.c
index af18edc..b1a92ae 100644
--- a/src/path.c
+++ b/src/path.c
@@ -160,7 +160,13 @@ int git_path_dirname_r(git_buf *buffer, const char *path)
 	while (endp > path && *endp == '/')
 		endp--;
 
-	if ((len = win32_prefix_length(path, endp - path + 1)) > 0) {
+	if (endp - path + 1 > INT_MAX) {
+		git_error_set(GIT_ERROR_INVALID, "path too long");
+		len = -1;
+		goto Exit;
+	}
+
+	if ((len = win32_prefix_length(path, (int)(endp - path + 1))) > 0) {
 		is_prefix = 1;
 		goto Exit;
 	}
@@ -180,7 +186,13 @@ int git_path_dirname_r(git_buf *buffer, const char *path)
 		endp--;
 	} while (endp > path && *endp == '/');
 
-	if ((len = win32_prefix_length(path, endp - path + 1)) > 0) {
+	if (endp - path + 1 > INT_MAX) {
+		git_error_set(GIT_ERROR_INVALID, "path too long");
+		len = -1;
+		goto Exit;
+	}
+
+	if ((len = win32_prefix_length(path, (int)(endp - path + 1))) > 0) {
 		is_prefix = 1;
 		goto Exit;
 	}
diff --git a/src/pool.c b/src/pool.c
index c0efe9c..b3bc8d4 100644
--- a/src/pool.c
+++ b/src/pool.c
@@ -14,30 +14,30 @@
 
 struct git_pool_page {
 	git_pool_page *next;
-	uint32_t size;
-	uint32_t avail;
+	size_t size;
+	size_t avail;
 	GIT_ALIGN(char data[GIT_FLEX_ARRAY], 8);
 };
 
-static void *pool_alloc_page(git_pool *pool, uint32_t size);
+static void *pool_alloc_page(git_pool *pool, size_t size);
 
-uint32_t git_pool__system_page_size(void)
+size_t git_pool__system_page_size(void)
 {
-	static uint32_t size = 0;
+	static size_t size = 0;
 
 	if (!size) {
 		size_t page_size;
 		if (git__page_size(&page_size) < 0)
 			page_size = 4096;
 		/* allow space for malloc overhead */
-		size = page_size - (2 * sizeof(void *)) - sizeof(git_pool_page);
+		size = (page_size - (2 * sizeof(void *)) - sizeof(git_pool_page));
 	}
 
 	return size;
 }
 
 #ifndef GIT_DEBUG_POOL
-void git_pool_init(git_pool *pool, uint32_t item_size)
+void git_pool_init(git_pool *pool, size_t item_size)
 {
 	assert(pool);
 	assert(item_size >= 1);
@@ -59,10 +59,10 @@ void git_pool_clear(git_pool *pool)
 	pool->pages = NULL;
 }
 
-static void *pool_alloc_page(git_pool *pool, uint32_t size)
+static void *pool_alloc_page(git_pool *pool, size_t size)
 {
 	git_pool_page *page;
-	const uint32_t new_page_size = (size <= pool->page_size) ? pool->page_size : size;
+	const size_t new_page_size = (size <= pool->page_size) ? pool->page_size : size;
 	size_t alloc_size;
 
 	if (GIT_ADD_SIZET_OVERFLOW(&alloc_size, new_page_size, sizeof(git_pool_page)) ||
@@ -78,7 +78,7 @@ static void *pool_alloc_page(git_pool *pool, uint32_t size)
 	return page->data;
 }
 
-static void *pool_alloc(git_pool *pool, uint32_t size)
+static void *pool_alloc(git_pool *pool, size_t size)
 {
 	git_pool_page *page = pool->pages;
 	void *ptr = NULL;
@@ -125,7 +125,7 @@ static int git_pool__ptr_cmp(const void * a, const void * b)
 	}
 }
 
-void git_pool_init(git_pool *pool, uint32_t item_size)
+void git_pool_init(git_pool *pool, size_t item_size)
 {
 	assert(pool);
 	assert(item_size >= 1);
@@ -141,7 +141,7 @@ void git_pool_clear(git_pool *pool)
 	git_vector_free_deep(&pool->allocations);
 }
 
-static void *pool_alloc(git_pool *pool, uint32_t size) {
+static void *pool_alloc(git_pool *pool, size_t size) {
 	void *ptr = NULL;
 	if((ptr = git__malloc(size)) == NULL) {
 		return NULL;
@@ -169,26 +169,26 @@ void git_pool_swap(git_pool *a, git_pool *b)
 	memcpy(b, &temp, sizeof(temp));
 }
 
-static uint32_t alloc_size(git_pool *pool, uint32_t count)
+static size_t alloc_size(git_pool *pool, size_t count)
 {
-	const uint32_t align = sizeof(void *) - 1;
+	const size_t align = sizeof(void *) - 1;
 
 	if (pool->item_size > 1) {
-		const uint32_t item_size = (pool->item_size + align) & ~align;
+		const size_t item_size = (pool->item_size + align) & ~align;
 		return item_size * count;
 	}
 
 	return (count + align) & ~align;
 }
 
-void *git_pool_malloc(git_pool *pool, uint32_t items)
+void *git_pool_malloc(git_pool *pool, size_t items)
 {
 	return pool_alloc(pool, alloc_size(pool, items));
 }
 
-void *git_pool_mallocz(git_pool *pool, uint32_t items)
+void *git_pool_mallocz(git_pool *pool, size_t items)
 {
-	const uint32_t size = alloc_size(pool, items);
+	const size_t size = alloc_size(pool, items);
 	void *ptr = pool_alloc(pool, size);
 	if (ptr)
 		memset(ptr, 0x0, size);
@@ -201,10 +201,10 @@ char *git_pool_strndup(git_pool *pool, const char *str, size_t n)
 
 	assert(pool && str && pool->item_size == sizeof(char));
 
-	if ((uint32_t)(n + 1) < n)
+	if (n == SIZE_MAX)
 		return NULL;
 
-	if ((ptr = git_pool_malloc(pool, (uint32_t)(n + 1))) != NULL) {
+	if ((ptr = git_pool_malloc(pool, (n + 1))) != NULL) {
 		memcpy(ptr, str, n);
 		ptr[n] = '\0';
 	}
@@ -226,14 +226,18 @@ char *git_pool_strdup_safe(git_pool *pool, const char *str)
 char *git_pool_strcat(git_pool *pool, const char *a, const char *b)
 {
 	void *ptr;
-	size_t len_a, len_b;
+	size_t len_a, len_b, total;
 
 	assert(pool && pool->item_size == sizeof(char));
 
 	len_a = a ? strlen(a) : 0;
 	len_b = b ? strlen(b) : 0;
 
-	if ((ptr = git_pool_malloc(pool, (uint32_t)(len_a + len_b + 1))) != NULL) {
+	if (GIT_ADD_SIZET_OVERFLOW(&total, len_a, len_b) ||
+		GIT_ADD_SIZET_OVERFLOW(&total, total, 1))
+		return NULL;
+
+	if ((ptr = git_pool_malloc(pool, total)) != NULL) {
 		if (len_a)
 			memcpy(ptr, a, len_a);
 		if (len_b)
diff --git a/src/pool.h b/src/pool.h
index 92ddf99..23f6899 100644
--- a/src/pool.h
+++ b/src/pool.h
@@ -32,8 +32,8 @@ typedef struct git_pool_page git_pool_page;
  */
 typedef struct {
 	git_pool_page *pages; /* allocated pages */
-	uint32_t item_size;  /* size of single alloc unit in bytes */
-	uint32_t page_size;  /* size of page in bytes */
+	size_t item_size;  /* size of single alloc unit in bytes */
+	size_t page_size;  /* size of page in bytes */
 } git_pool;
 
 #define GIT_POOL_INIT { NULL, 0, 0 }
@@ -57,8 +57,8 @@ typedef struct {
  */
 typedef struct {
 	git_vector allocations;
-	uint32_t item_size;
-	uint32_t page_size;
+	size_t item_size;
+	size_t page_size;
 } git_pool;
 
 #define GIT_POOL_INIT { GIT_VECTOR_INIT, 0, 0 }
@@ -81,7 +81,7 @@ typedef struct {
  * Of course, you can use this in other ways, but those are the
  * two most common patterns.
  */
-extern void git_pool_init(git_pool *pool, uint32_t item_size);
+extern void git_pool_init(git_pool *pool, size_t item_size);
 
 /**
  * Free all items in pool
@@ -96,8 +96,8 @@ extern void git_pool_swap(git_pool *a, git_pool *b);
 /**
  * Allocate space for one or more items from a pool.
  */
-extern void *git_pool_malloc(git_pool *pool, uint32_t items);
-extern void *git_pool_mallocz(git_pool *pool, uint32_t items);
+extern void *git_pool_malloc(git_pool *pool, size_t items);
+extern void *git_pool_mallocz(git_pool *pool, size_t items);
 
 /**
  * Allocate space and duplicate string data into it.
diff --git a/src/rebase.c b/src/rebase.c
index 6de7180..fbba4bc 100644
--- a/src/rebase.c
+++ b/src/rebase.c
@@ -298,7 +298,8 @@ int git_rebase_open(
 	git_rebase *rebase;
 	git_buf path = GIT_BUF_INIT, orig_head_name = GIT_BUF_INIT,
 		orig_head_id = GIT_BUF_INIT, onto_id = GIT_BUF_INIT;
-	int state_path_len, error;
+	size_t state_path_len;
+	int error;
 
 	assert(repo);
 
diff --git a/src/repository.c b/src/repository.c
index d3c7bab..6d7954a 100644
--- a/src/repository.c
+++ b/src/repository.c
@@ -878,7 +878,8 @@ int git_repository_open_from_worktree(git_repository **repo_out, git_worktree *w
 {
 	git_buf path = GIT_BUF_INIT;
 	git_repository *repo = NULL;
-	int len, err;
+	size_t len;
+	int err;
 
 	assert(repo_out && wt);
 
diff --git a/src/sortedcache.c b/src/sortedcache.c
index 15ba6fd..8f7ea23 100644
--- a/src/sortedcache.c
+++ b/src/sortedcache.c
@@ -282,7 +282,7 @@ int git_sortedcache_upsert(void **out, git_sortedcache *sc, const char *key)
 	itemlen = sc->item_path_offset + keylen + 1;
 	itemlen = (itemlen + 7) & ~7;
 
-	if ((item = git_pool_mallocz(&sc->pool, (uint32_t)itemlen)) == NULL) {
+	if ((item = git_pool_mallocz(&sc->pool, itemlen)) == NULL) {
 		/* don't use GIT_ERROR_CHECK_ALLOC b/c of lock */
 		error = -1;
 		goto done;
diff --git a/src/trailer.c b/src/trailer.c
index dc8d1ab..f837c97 100644
--- a/src/trailer.c
+++ b/src/trailer.c
@@ -42,15 +42,19 @@ static const char *next_line(const char *str)
 }
 
 /*
- * Return the position of the start of the last line. If len is 0, return -1.
+ * Return the position of the start of the last line. If len is 0, return 0.
  */
-static int last_line(const char *buf, size_t len)
+static bool last_line(size_t *out, const char *buf, size_t len)
 {
-	int i;
+	size_t i;
+
+	*out = 0;
+
 	if (len == 0)
-		return -1;
+		return false;
 	if (len == 1)
-		return 0;
+		return true;
+
 	/*
 	 * Skip the last character (in addition to the null terminator),
 	 * because if the last character is a newline, it is considered as part
@@ -58,31 +62,37 @@ static int last_line(const char *buf, size_t len)
 	 */
 	i = len - 2;
 
-	for (; i >= 0; i--) {
-		if (buf[i] == '\n')
-			return i + 1;
+	for (; i > 0; i--) {
+		if (buf[i] == '\n') {
+			*out = i + 1;
+			return true;
+		}
 	}
-	return 0;
+	return true;
 }
 
 /*
  * If the given line is of the form
- * "<token><optional whitespace><separator>..." or "<separator>...", return the
- * location of the separator. Otherwise, return -1.  The optional whitespace
- * is allowed there primarily to allow things like "Bug #43" where <token> is
- * "Bug" and <separator> is "#".
+ * "<token><optional whitespace><separator>..." or "<separator>...", sets out
+ * to the location of the separator and returns true.  Otherwise, returns
+ * false.  The optional whitespace is allowed there primarily to allow things
+ * like "Bug #43" where <token> is "Bug" and <separator> is "#".
  *
- * The separator-starts-line case (in which this function returns 0) is
- * distinguished from the non-well-formed-line case (in which this function
- * returns -1) because some callers of this function need such a distinction.
+ * The separator-starts-line case (in which this function returns true and
+ * sets out to 0) is distinguished from the non-well-formed-line case (in
+ * which this function returns false) because some callers of this function
+ * need such a distinction.
  */
-static int find_separator(const char *line, const char *separators)
+static bool find_separator(size_t *out, const char *line, const char *separators)
 {
 	int whitespace_found = 0;
 	const char *c;
 	for (c = line; *c; c++) {
-		if (strchr(separators, *c))
-			return c - line;
+		if (strchr(separators, *c)) {
+			*out = c - line;
+			return true;
+		}
+
 		if (!whitespace_found && (isalnum(*c) || *c == '-'))
 			continue;
 		if (c != line && (*c == ' ' || *c == '\t')) {
@@ -91,7 +101,7 @@ static int find_separator(const char *line, const char *separators)
 		}
 		break;
 	}
-	return -1;
+	return false;
 }
 
 /*
@@ -104,10 +114,9 @@ static int find_separator(const char *line, const char *separators)
  * Returns the number of bytes from the tail to ignore, to be fed as
  * the second parameter to append_signoff().
  */
-static int ignore_non_trailer(const char *buf, size_t len)
+static size_t ignore_non_trailer(const char *buf, size_t len)
 {
-	int boc = 0;
-	size_t bol = 0;
+	size_t boc = 0, bol = 0;
 	int in_old_conflicts_block = 0;
 	size_t cutoff = len;
 
@@ -144,7 +153,7 @@ static int ignore_non_trailer(const char *buf, size_t len)
  * Return the position of the start of the patch or the length of str if there
  * is no patch in the message.
  */
-static int find_patch_start(const char *str)
+static size_t find_patch_start(const char *str)
 {
 	const char *s;
 
@@ -160,10 +169,11 @@ static int find_patch_start(const char *str)
  * Return the position of the first trailer line or len if there are no
  * trailers.
  */
-static int find_trailer_start(const char *buf, size_t len)
+static size_t find_trailer_start(const char *buf, size_t len)
 {
 	const char *s;
-	int end_of_title, l, only_spaces = 1;
+	size_t end_of_title, l;
+	int only_spaces = 1;
 	int recognized_prefix = 0, trailer_lines = 0, non_trailer_lines = 0;
 	/*
 	 * Number of possible continuation lines encountered. This will be
@@ -189,12 +199,11 @@ static int find_trailer_start(const char *buf, size_t len)
 	 * trailers, or (ii) contains at least one Git-generated trailer and
 	 * consists of at least 25% trailers.
 	 */
-	for (l = last_line(buf, len);
-	     l >= end_of_title;
-	     l = last_line(buf, l)) {
+	l = len;
+	while (last_line(&l, buf, l) && l >= end_of_title) {
 		const char *bol = buf + l;
 		const char *const *p;
-		int separator_pos;
+		size_t separator_pos = 0;
 
 		if (bol[0] == COMMENT_LINE_CHAR) {
 			non_trailer_lines += possible_continuation_lines;
@@ -223,7 +232,7 @@ static int find_trailer_start(const char *buf, size_t len)
 			}
 		}
 
-		separator_pos = find_separator(bol, TRAILER_SEPARATORS);
+		find_separator(&separator_pos, bol, TRAILER_SEPARATORS);
 		if (separator_pos >= 1 && !isspace(bol[0])) {
 			trailer_lines++;
 			possible_continuation_lines = 0;
@@ -244,7 +253,7 @@ continue_outer_loop:
 }
 
 /* Return the position of the end of the trailers. */
-static int find_trailer_end(const char *buf, size_t len)
+static size_t find_trailer_end(const char *buf, size_t len)
 {
 	return len - ignore_non_trailer(buf, len);
 }
diff --git a/src/transports/local.c b/src/transports/local.c
index 591dd3b..cfc6c2a 100644
--- a/src/transports/local.c
+++ b/src/transports/local.c
@@ -501,7 +501,7 @@ static int local_counting(int stage, unsigned int current, unsigned int total, v
 	if (git_buf_oom(&progress_info))
 		return -1;
 
-	error = t->progress_cb(git_buf_cstr(&progress_info), git_buf_len(&progress_info), t->message_cb_payload);
+	error = t->progress_cb(git_buf_cstr(&progress_info), (int)git_buf_len(&progress_info), t->message_cb_payload);
 	git_buf_dispose(&progress_info);
 
 	return error;
@@ -588,7 +588,7 @@ static int local_download_pack(
 		goto cleanup;
 
 	if (t->progress_cb &&
-	    (error = t->progress_cb(git_buf_cstr(&progress_info), git_buf_len(&progress_info), t->message_cb_payload)) < 0)
+	    (error = t->progress_cb(git_buf_cstr(&progress_info), (int)git_buf_len(&progress_info), t->message_cb_payload)) < 0)
 		goto cleanup;
 
 	/* Walk the objects, building a packfile */
@@ -602,7 +602,7 @@ static int local_download_pack(
 		goto cleanup;
 
 	if (t->progress_cb &&
-	    (error = t->progress_cb(git_buf_cstr(&progress_info), git_buf_len(&progress_info), t->message_cb_payload)) < 0)
+	    (error = t->progress_cb(git_buf_cstr(&progress_info), (int)git_buf_len(&progress_info), t->message_cb_payload)) < 0)
 		goto cleanup;
 
 	if ((error = git_odb_write_pack(&writepack, odb, progress_cb, progress_payload)) != 0)
diff --git a/src/transports/smart.c b/src/transports/smart.c
index f3d55b2..8e8af00 100644
--- a/src/transports/smart.c
+++ b/src/transports/smart.c
@@ -73,7 +73,7 @@ static int git_smart__set_callbacks(
 	return 0;
 }
 
-static int http_header_name_length(const char *http_header)
+static size_t http_header_name_length(const char *http_header)
 {
 	const char *colon = strchr(http_header, ':');
 	if (!colon)
@@ -84,7 +84,7 @@ static int http_header_name_length(const char *http_header)
 static bool is_malformed_http_header(const char *http_header)
 {
 	const char *c;
-	int name_len;
+	size_t name_len;
 
 	/* Disallow \r and \n */
 	c = strchr(http_header, '\r');
@@ -114,7 +114,7 @@ static char *forbidden_custom_headers[] = {
 static bool is_forbidden_custom_header(const char *custom_header)
 {
 	unsigned long i;
-	int name_len = http_header_name_length(custom_header);
+	size_t name_len = http_header_name_length(custom_header);
 
 	/* Disallow headers that we set */
 	for (i = 0; i < ARRAY_SIZE(forbidden_custom_headers); i++)
diff --git a/src/transports/smart_protocol.c b/src/transports/smart_protocol.c
index c251eb8..cfbe7e4 100644
--- a/src/transports/smart_protocol.c
+++ b/src/transports/smart_protocol.c
@@ -604,7 +604,14 @@ int git_smart__download_pack(
 			} else if (pkt->type == GIT_PKT_PROGRESS) {
 				if (t->progress_cb) {
 					git_pkt_progress *p = (git_pkt_progress *) pkt;
-					error = t->progress_cb(p->data, p->len, t->message_cb_payload);
+
+					if (p->len > INT_MAX) {
+						git_error_set(GIT_ERROR_NET, "oversized progress message");
+						error = GIT_ERROR;
+						goto done;
+					}
+
+					error = t->progress_cb(p->data, (int)p->len, t->message_cb_payload);
 				}
 			} else if (pkt->type == GIT_PKT_DATA) {
 				git_pkt_data *p = (git_pkt_data *) pkt;
@@ -839,7 +846,14 @@ static int parse_report(transport_smart *transport, git_push *push)
 			case GIT_PKT_PROGRESS:
 				if (transport->progress_cb) {
 					git_pkt_progress *p = (git_pkt_progress *) pkt;
-					error = transport->progress_cb(p->data, p->len, transport->message_cb_payload);
+
+					if (p->len > INT_MAX) {
+						git_error_set(GIT_ERROR_NET, "oversized progress message");
+						error = GIT_ERROR;
+						goto done;
+					}
+
+					error = transport->progress_cb(p->data, (int)p->len, transport->message_cb_payload);
 				}
 				break;
 			default:
diff --git a/src/transports/winhttp.c b/src/transports/winhttp.c
index 6392a7d..7fc6b70 100644
--- a/src/transports/winhttp.c
+++ b/src/transports/winhttp.c
@@ -48,6 +48,10 @@
 # define WINHTTP_FLAG_SECURE_PROTOCOL_TLS1_2 0x00000800
 #endif
 
+#ifndef DWORD_MAX
+# define DWORD_MAX 0xffffffff
+#endif
+
 static const char *prefix_https = "https://";
 static const char *upload_pack_service = "upload-pack";
 static const char *upload_pack_ls_service_url = "/info/refs?service=git-upload-pack";
@@ -339,6 +343,8 @@ static int apply_credentials(
 {
 	int error = 0;
 
+	GIT_UNUSED(url);
+
 	/* If we have creds, just apply them */
 	if (creds && creds->credtype == GIT_CREDTYPE_USERPASS_PLAINTEXT)
 		error = apply_userpass_credentials(request, target, mechanisms, creds);
@@ -686,6 +692,10 @@ static void CALLBACK winhttp_status(
 {
 	DWORD status;
 
+	GIT_UNUSED(connection);
+	GIT_UNUSED(ctx);
+	GIT_UNUSED(info_len);
+
 	if (code != WINHTTP_CALLBACK_STATUS_SECURE_FAILURE)
 		return;
 
@@ -816,6 +826,11 @@ static int do_send_request(winhttp_stream *s, size_t len, int ignore_length)
 	int attempts;
 	bool success;
 
+	if (len > DWORD_MAX) {
+		SetLastError(ERROR_NOT_ENOUGH_MEMORY);
+		return -1;
+	}
+
 	for (attempts = 0; attempts < 5; attempts++) {
 		if (ignore_length) {
 			success = WinHttpSendRequest(s->request,
@@ -826,7 +841,7 @@ static int do_send_request(winhttp_stream *s, size_t len, int ignore_length)
 			success = WinHttpSendRequest(s->request,
 				WINHTTP_NO_ADDITIONAL_HEADERS, 0,
 				WINHTTP_NO_REQUEST_DATA, 0,
-				len, 0);
+				(DWORD)len, 0);
 		}
 
 		if (success || GetLastError() != (DWORD)SEC_E_BUFFER_TOO_SMALL)
diff --git a/src/tree-cache.c b/src/tree-cache.c
index d3ba864..04d86fd 100644
--- a/src/tree-cache.c
+++ b/src/tree-cache.c
@@ -120,12 +120,14 @@ static int read_tree_internal(git_tree_cache **out,
 
 	/* Parse children: */
 	if (tree->children_count > 0) {
-		unsigned int i;
+		size_t i, bufsize;
 
-		tree->children = git_pool_malloc(pool, tree->children_count * sizeof(git_tree_cache *));
+		GIT_ERROR_CHECK_ALLOC_MULTIPLY(&bufsize, tree->children_count, sizeof(git_tree_cache*));
+
+		tree->children = git_pool_malloc(pool, bufsize);
 		GIT_ERROR_CHECK_ALLOC(tree->children);
 
-		memset(tree->children, 0x0, tree->children_count * sizeof(git_tree_cache *));
+		memset(tree->children, 0x0, bufsize);
 
 		for (i = 0; i < tree->children_count; ++i) {
 			if (read_tree_internal(&tree->children[i], &buffer, buffer_end, pool) < 0)
@@ -160,7 +162,7 @@ int git_tree_cache_read(git_tree_cache **tree, const char *buffer, size_t buffer
 static int read_tree_recursive(git_tree_cache *cache, const git_tree *tree, git_pool *pool)
 {
 	git_repository *repo;
-	size_t i, j, nentries, ntrees;
+	size_t i, j, nentries, ntrees, alloc_size;
 	int error;
 
 	repo = git_tree_owner(tree);
@@ -182,8 +184,10 @@ static int read_tree_recursive(git_tree_cache *cache, const git_tree *tree, git_
 			ntrees++;
 	}
 
+	GIT_ERROR_CHECK_ALLOC_MULTIPLY(&alloc_size, ntrees, sizeof(git_tree_cache *));
+
 	cache->children_count = ntrees;
-	cache->children = git_pool_mallocz(pool, ntrees * sizeof(git_tree_cache *));
+	cache->children = git_pool_mallocz(pool, alloc_size);
 	GIT_ERROR_CHECK_ALLOC(cache->children);
 
 	j = 0;
@@ -232,11 +236,14 @@ int git_tree_cache_read_tree(git_tree_cache **out, const git_tree *tree, git_poo
 
 int git_tree_cache_new(git_tree_cache **out, const char *name, git_pool *pool)
 {
-	size_t name_len;
+	size_t name_len, alloc_size;
 	git_tree_cache *tree;
 
 	name_len = strlen(name);
-	tree = git_pool_malloc(pool, sizeof(git_tree_cache) + name_len + 1);
+
+	GIT_ERROR_CHECK_ALLOC_ADD3(&alloc_size, sizeof(git_tree_cache), name_len, 1);
+
+	tree = git_pool_malloc(pool, alloc_size);
 	GIT_ERROR_CHECK_ALLOC(tree);
 
 	memset(tree, 0x0, sizeof(git_tree_cache));
diff --git a/src/tree.c b/src/tree.c
index 5a48bfc..3799cab 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -340,7 +340,7 @@ size_t git_tree_entrycount(const git_tree *tree)
 	return tree->entries.size;
 }
 
-unsigned int git_treebuilder_entrycount(git_treebuilder *bld)
+size_t git_treebuilder_entrycount(git_treebuilder *bld)
 {
 	assert(bld);
 
diff --git a/src/util.c b/src/util.c
index 508dce5..316a289 100644
--- a/src/util.c
+++ b/src/util.c
@@ -192,7 +192,7 @@ int git__strntol32(int32_t *result, const char *nptr, size_t nptr_len, const cha
 
 	tmp_int = tmp_long & 0xFFFFFFFF;
 	if (tmp_int != tmp_long) {
-		int len = tmp_endptr - nptr;
+		int len = (int)(tmp_endptr - nptr);
 		git_error_set(GIT_ERROR_INVALID, "failed to convert: '%.*s' is too large", len, nptr);
 		return -1;
 	}
@@ -802,23 +802,23 @@ static const int8_t utf8proc_utf8class[256] = {
 	4, 4, 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0, 0, 0, 0
 };
 
-int git__utf8_charlen(const uint8_t *str, int str_len)
+int git__utf8_charlen(const uint8_t *str, size_t str_len)
 {
-	int length, i;
+	size_t length, i;
 
 	length = utf8proc_utf8class[str[0]];
 	if (!length)
 		return -1;
 
-	if (str_len >= 0 && length > str_len)
-		return -str_len;
+	if (str_len > 0 && length > str_len)
+		return -1;
 
 	for (i = 1; i < length; i++) {
 		if ((str[i] & 0xC0) != 0x80)
-			return -i;
+			return -1;
 	}
 
-	return length;
+	return (int)length;
 }
 
 int git__utf8_iterate(const uint8_t *str, int str_len, int32_t *dst)
diff --git a/src/wildmatch.c b/src/wildmatch.c
index 865f3f0..a894e48 100644
--- a/src/wildmatch.c
+++ b/src/wildmatch.c
@@ -250,7 +250,7 @@ static int dowild(const uchar *p, const uchar *text, unsigned int flags)
 					for (s = p += 2; (p_ch = *p) && p_ch != ']'; p++) {} /*SHARED ITERATOR*/
 					if (!p_ch)
 						return WM_ABORT_ALL;
-					i = p - s - 1;
+					i = (int)(p - s - 1);
 					if (i < 0 || p[-1] != ':') {
 						/* Didn't find ":]", so treat like a normal set. */
 						p = s - 2;
diff --git a/src/win32/path_w32.c b/src/win32/path_w32.c
index b955b02..eda85ab 100644
--- a/src/win32/path_w32.c
+++ b/src/win32/path_w32.c
@@ -140,14 +140,24 @@ int git_win32_path_canonicalize(git_win32_path path)
 
 	*to = L'\0';
 
-	return (to - path);
+	if ((to - path) > INT_MAX) {
+		SetLastError(ERROR_FILENAME_EXCED_RANGE);
+		return -1;
+	}
+
+	return (int)(to - path);
 }
 
 int git_win32_path__cwd(wchar_t *out, size_t len)
 {
 	int cwd_len;
 
-	if ((cwd_len = path__cwd(out, len)) < 0)
+	if (len > INT_MAX) {
+		errno = ENAMETOOLONG;
+		return -1;
+	}
+
+	if ((cwd_len = path__cwd(out, (int)len)) < 0)
 		return -1;
 
 	/* UNC paths */
diff --git a/src/win32/thread.c b/src/win32/thread.c
index 2d96005..c3a6c0e 100644
--- a/src/win32/thread.c
+++ b/src/win32/thread.c
@@ -42,15 +42,15 @@ int git_threads_init(void)
 	HMODULE hModule = GetModuleHandleW(L"kernel32");
 
 	if (hModule) {
-		win32_srwlock_initialize = (win32_srwlock_fn)
+		win32_srwlock_initialize = (win32_srwlock_fn)(void *)
 			GetProcAddress(hModule, "InitializeSRWLock");
-		win32_srwlock_acquire_shared = (win32_srwlock_fn)
+		win32_srwlock_acquire_shared = (win32_srwlock_fn)(void *)
 			GetProcAddress(hModule, "AcquireSRWLockShared");
-		win32_srwlock_release_shared = (win32_srwlock_fn)
+		win32_srwlock_release_shared = (win32_srwlock_fn)(void *)
 			GetProcAddress(hModule, "ReleaseSRWLockShared");
-		win32_srwlock_acquire_exclusive = (win32_srwlock_fn)
+		win32_srwlock_acquire_exclusive = (win32_srwlock_fn)(void *)
 			GetProcAddress(hModule, "AcquireSRWLockExclusive");
-		win32_srwlock_release_exclusive = (win32_srwlock_fn)
+		win32_srwlock_release_exclusive = (win32_srwlock_fn)(void *)
 			GetProcAddress(hModule, "ReleaseSRWLockExclusive");
 	}
 
diff --git a/src/win32/w32_buffer.c b/src/win32/w32_buffer.c
index 22ea9a1..b78a7e6 100644
--- a/src/win32/w32_buffer.c
+++ b/src/win32/w32_buffer.c
@@ -25,13 +25,17 @@ int git_buf_put_w(git_buf *buf, const wchar_t *string_w, size_t len_w)
 	int utf8_len, utf8_write_len;
 	size_t new_size;
 
-	if (!len_w)
+	if (!len_w) {
 		return 0;
+	} else if (len_w > INT_MAX) {
+		git_error_set_oom();
+		return -1;
+	}
 
 	assert(string_w);
 
 	/* Measure the string necessary for conversion */
-	if ((utf8_len = WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS, string_w, len_w, NULL, 0, NULL, NULL)) == 0)
+	if ((utf8_len = WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS, string_w, (int)len_w, NULL, 0, NULL, NULL)) == 0)
 		return 0;
 
 	assert(utf8_len > 0);
@@ -43,7 +47,7 @@ int git_buf_put_w(git_buf *buf, const wchar_t *string_w, size_t len_w)
 		return -1;
 
 	if ((utf8_write_len = WideCharToMultiByte(
-			CP_UTF8, WC_ERR_INVALID_CHARS, string_w, len_w, &buf->ptr[buf->size], utf8_len, NULL, NULL)) == 0)
+			CP_UTF8, WC_ERR_INVALID_CHARS, string_w, (int)len_w, &buf->ptr[buf->size], utf8_len, NULL, NULL)) == 0)
 		return handle_wc_error();
 
 	assert(utf8_write_len == utf8_len);
diff --git a/src/win32/w32_stack.c b/src/win32/w32_stack.c
index c9d6b1a..6eb7196 100644
--- a/src/win32/w32_stack.c
+++ b/src/win32/w32_stack.c
@@ -13,11 +13,6 @@
 #include "win32/posix.h"
 #include "hash.h"
 
-/**
- * This is supposedly defined in WinBase.h (from Windows.h) but there were linker issues.
- */
-USHORT WINAPI RtlCaptureStackBackTrace(ULONG, ULONG, PVOID*, PULONG);
-
 static bool   g_win32_stack_initialized = false;
 static HANDLE g_win32_stack_process = INVALID_HANDLE_VALUE;
 static git_win32__stack__aux_cb_alloc  g_aux_cb_alloc  = NULL;
diff --git a/src/win32/w32_util.c b/src/win32/w32_util.c
index 10e17fc..fe4b75b 100644
--- a/src/win32/w32_util.c
+++ b/src/win32/w32_util.c
@@ -93,3 +93,34 @@ int git_win32__hidden(bool *out, const char *path)
 	*out = (attrs & FILE_ATTRIBUTE_HIDDEN) ? true : false;
 	return 0;
 }
+
+int git_win32__file_attribute_to_stat(
+	struct stat *st,
+	const WIN32_FILE_ATTRIBUTE_DATA *attrdata,
+	const wchar_t *path)
+{
+	git_win32__stat_init(st,
+		attrdata->dwFileAttributes,
+		attrdata->nFileSizeHigh,
+		attrdata->nFileSizeLow,
+		attrdata->ftCreationTime,
+		attrdata->ftLastAccessTime,
+		attrdata->ftLastWriteTime);
+
+	if (attrdata->dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT && path) {
+		git_win32_path target;
+
+		if (git_win32_path_readlink_w(target, path) >= 0) {
+			st->st_mode = (st->st_mode & ~S_IFMT) | S_IFLNK;
+
+			/* st_size gets the UTF-8 length of the target name, in bytes,
+			 * not counting the NULL terminator */
+			if ((st->st_size = git__utf16_to_8(NULL, 0, target)) < 0) {
+				git_error_set(GIT_ERROR_OS, "could not convert reparse point name for '%ls'", path);
+				return -1;
+			}
+		}
+	}
+
+	return 0;
+}
diff --git a/src/win32/w32_util.h b/src/win32/w32_util.h
index 3a79425..ac19115 100644
--- a/src/win32/w32_util.h
+++ b/src/win32/w32_util.h
@@ -59,6 +59,11 @@ extern int git_win32__set_hidden(const char *path, bool hidden);
  */
 extern int git_win32__hidden(bool *hidden, const char *path);
 
+extern int git_win32__file_attribute_to_stat(
+	struct stat *st,
+	const WIN32_FILE_ATTRIBUTE_DATA *attrdata,
+	const wchar_t *path);
+
 /**
  * Converts a FILETIME structure to a struct timespec.
  *
@@ -136,35 +141,4 @@ GIT_INLINE(void) git_win32__file_information_to_stat(
 		fileinfo->ftLastWriteTime);
 }
 
-GIT_INLINE(int) git_win32__file_attribute_to_stat(
-	struct stat *st,
-	const WIN32_FILE_ATTRIBUTE_DATA *attrdata,
-	const wchar_t *path)
-{
-	git_win32__stat_init(st,
-		attrdata->dwFileAttributes,
-		attrdata->nFileSizeHigh,
-		attrdata->nFileSizeLow,
-		attrdata->ftCreationTime,
-		attrdata->ftLastAccessTime,
-		attrdata->ftLastWriteTime);
-
-	if (attrdata->dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT && path) {
-		git_win32_path target;
-
-		if (git_win32_path_readlink_w(target, path) >= 0) {
-			st->st_mode = (st->st_mode & ~S_IFMT) | S_IFLNK;
-
-			/* st_size gets the UTF-8 length of the target name, in bytes,
-			 * not counting the NULL terminator */
-			if ((st->st_size = git__utf16_to_8(NULL, 0, target)) < 0) {
-				git_error_set(GIT_ERROR_OS, "could not convert reparse point name for '%ls'", path);
-				return -1;
-			}
-		}
-	}
-
-	return 0;
-}
-
 #endif
diff --git a/src/worktree.c b/src/worktree.c
index 7213b8a..ef4ebfd 100644
--- a/src/worktree.c
+++ b/src/worktree.c
@@ -34,7 +34,7 @@ int git_worktree_list(git_strarray *wts, git_repository *repo)
 	git_vector worktrees = GIT_VECTOR_INIT;
 	git_buf path = GIT_BUF_INIT;
 	char *worktree;
-	unsigned i, len;
+	size_t i, len;
 	int error;
 
 	assert(wts && repo);
diff --git a/tests/clar.c b/tests/clar.c
index 27d35e1..459ece0 100644
--- a/tests/clar.c
+++ b/tests/clar.c
@@ -67,7 +67,7 @@
 #		define PRIxZ "Ix"
 #	endif
 
-#	ifdef _MSC_VER
+#	if defined(_MSC_VER) || defined(__MINGW32__)
 	typedef struct stat STAT_T;
 #	else
 	typedef struct _stat STAT_T;
diff --git a/tests/core/link.c b/tests/core/link.c
index 8cd6b01..1e5ed45 100644
--- a/tests/core/link.c
+++ b/tests/core/link.c
@@ -54,7 +54,7 @@ static void do_symlink(const char *old, const char *new, int is_dir)
 	create_symlink_func pCreateSymbolicLink;
 
 	cl_assert(module = GetModuleHandle("kernel32"));
-	cl_assert(pCreateSymbolicLink = (create_symlink_func)GetProcAddress(module, "CreateSymbolicLinkA"));
+	cl_assert(pCreateSymbolicLink = (create_symlink_func)(void *)GetProcAddress(module, "CreateSymbolicLinkA"));
 
 	cl_win32_pass(pCreateSymbolicLink(new, old, is_dir));
 #endif
@@ -70,7 +70,7 @@ static void do_hardlink(const char *old, const char *new)
 	create_hardlink_func pCreateHardLink;
 
 	cl_assert(module = GetModuleHandle("kernel32"));
-	cl_assert(pCreateHardLink = (create_hardlink_func)GetProcAddress(module, "CreateHardLinkA"));
+	cl_assert(pCreateHardLink = (create_hardlink_func)(void *)GetProcAddress(module, "CreateHardLinkA"));
 
 	cl_win32_pass(pCreateHardLink(new, old, 0));
 #endif
diff --git a/tests/object/tree/read.c b/tests/object/tree/read.c
index 6fe224b..de2e64c 100644
--- a/tests/object/tree/read.c
+++ b/tests/object/tree/read.c
@@ -75,8 +75,9 @@ void test_object_tree_read__two(void)
 }
 
 #define BIGFILE "bigfile"
+
 #ifdef GIT_ARCH_64
-# define BIGFILE_SIZE (size_t)4 * 1024 * 1024 * 1024 /* 4 GiB */
+#define BIGFILE_SIZE (off_t)4294967296
 #else
 # define BIGFILE_SIZE SIZE_MAX
 #endif
diff --git a/tests/online/fetchhead.c b/tests/online/fetchhead.c
index ae72dde..7e9ca7e 100644
--- a/tests/online/fetchhead.c
+++ b/tests/online/fetchhead.c
@@ -35,10 +35,10 @@ static void fetchhead_test_clone(void)
 	cl_git_pass(git_clone(&g_repo, LIVE_REPO_URL, "./foo", &g_options));
 }
 
-static int count_references(void)
+static size_t count_references(void)
 {
 	git_strarray array;
-	int refs;
+	size_t refs;
 
 	cl_git_pass(git_reference_list(&array, g_repo));
 	refs = array.count;
@@ -118,7 +118,7 @@ void test_online_fetchhead__no_merges(void)
 void test_online_fetchhead__explicit_dst_refspec_creates_branch(void)
 {
 	git_reference *ref;
-	int refs;
+	size_t refs;
 
 	fetchhead_test_clone();
 	refs = count_references();
@@ -133,7 +133,7 @@ void test_online_fetchhead__explicit_dst_refspec_creates_branch(void)
 void test_online_fetchhead__empty_dst_refspec_creates_no_branch(void)
 {
 	git_reference *ref;
-	int refs;
+	size_t refs;
 
 	fetchhead_test_clone();
 	refs = count_references();
@@ -146,7 +146,7 @@ void test_online_fetchhead__empty_dst_refspec_creates_no_branch(void)
 
 void test_online_fetchhead__colon_only_dst_refspec_creates_no_branch(void)
 {
-	int refs;
+	size_t refs;
 
 	fetchhead_test_clone();
 	refs = count_references();
diff --git a/tests/worktree/worktree.c b/tests/worktree/worktree.c
index d41aa2c..5e99dbf 100644
--- a/tests/worktree/worktree.c
+++ b/tests/worktree/worktree.c
@@ -42,7 +42,7 @@ void test_worktree_worktree__list_with_invalid_worktree_dirs(void)
 	};
 	git_buf path = GIT_BUF_INIT;
 	git_strarray wts;
-	unsigned i, j, len;
+	size_t i, j, len;
 
 	cl_git_pass(git_buf_printf(&path, "%s/worktrees/invalid",
 		    fixture.repo->commondir));