for-each-ref: add split message parts to %(contents:*).
[gitweb.git] / zlib.c
diff --git a/zlib.c b/zlib.c
index be9d7e963b88ac20cf4639de9dd4ddaaf3ff7a80..3c63d480c75e9939fb3a047f595b032e9509d681 100644 (file)
--- a/zlib.c
+++ b/zlib.c
@@ -22,29 +22,115 @@ static const char *zerr_to_string(int status)
        }
 }
 
-void git_inflate_init(z_streamp strm)
+/*
+ * avail_in and avail_out in zlib are counted in uInt, which typically
+ * limits the size of the buffer we can use to 4GB when interacting
+ * with zlib in a single call to inflate/deflate.
+ */
+/* #define ZLIB_BUF_MAX ((uInt)-1) */
+#define ZLIB_BUF_MAX ((uInt) 1024 * 1024 * 1024) /* 1GB */
+static inline uInt zlib_buf_cap(unsigned long len)
+{
+       return (ZLIB_BUF_MAX < len) ? ZLIB_BUF_MAX : len;
+}
+
+static void zlib_pre_call(git_zstream *s)
+{
+       s->z.next_in = s->next_in;
+       s->z.next_out = s->next_out;
+       s->z.total_in = s->total_in;
+       s->z.total_out = s->total_out;
+       s->z.avail_in = zlib_buf_cap(s->avail_in);
+       s->z.avail_out = zlib_buf_cap(s->avail_out);
+}
+
+static void zlib_post_call(git_zstream *s)
+{
+       unsigned long bytes_consumed;
+       unsigned long bytes_produced;
+
+       bytes_consumed = s->z.next_in - s->next_in;
+       bytes_produced = s->z.next_out - s->next_out;
+       if (s->z.total_out != s->total_out + bytes_produced)
+               die("BUG: total_out mismatch");
+       if (s->z.total_in != s->total_in + bytes_consumed)
+               die("BUG: total_in mismatch");
+
+       s->total_out = s->z.total_out;
+       s->total_in = s->z.total_in;
+       s->next_in = s->z.next_in;
+       s->next_out = s->z.next_out;
+       s->avail_in -= bytes_consumed;
+       s->avail_out -= bytes_produced;
+}
+
+void git_inflate_init(git_zstream *strm)
 {
-       int status = inflateInit(strm);
+       int status;
 
+       zlib_pre_call(strm);
+       status = inflateInit(&strm->z);
+       zlib_post_call(strm);
        if (status == Z_OK)
                return;
        die("inflateInit: %s (%s)", zerr_to_string(status),
-           strm->msg ? strm->msg : "no message");
+           strm->z.msg ? strm->z.msg : "no message");
+}
+
+void git_inflate_init_gzip_only(git_zstream *strm)
+{
+       /*
+        * Use default 15 bits, +16 is to accept only gzip and to
+        * yield Z_DATA_ERROR when fed zlib format.
+        */
+       const int windowBits = 15 + 16;
+       int status;
+
+       zlib_pre_call(strm);
+       status = inflateInit2(&strm->z, windowBits);
+       zlib_post_call(strm);
+       if (status == Z_OK)
+               return;
+       die("inflateInit2: %s (%s)", zerr_to_string(status),
+           strm->z.msg ? strm->z.msg : "no message");
 }
 
-void git_inflate_end(z_streamp strm)
+void git_inflate_end(git_zstream *strm)
 {
-       int status = inflateEnd(strm);
+       int status;
 
+       zlib_pre_call(strm);
+       status = inflateEnd(&strm->z);
+       zlib_post_call(strm);
        if (status == Z_OK)
                return;
        error("inflateEnd: %s (%s)", zerr_to_string(status),
-             strm->msg ? strm->msg : "no message");
+             strm->z.msg ? strm->z.msg : "no message");
 }
 
-int git_inflate(z_streamp strm, int flush)
+int git_inflate(git_zstream *strm, int flush)
 {
-       int status = inflate(strm, flush);
+       int status;
+
+       for (;;) {
+               zlib_pre_call(strm);
+               /* Never say Z_FINISH unless we are feeding everything */
+               status = inflate(&strm->z,
+                                (strm->z.avail_in != strm->avail_in)
+                                ? 0 : flush);
+               if (status == Z_MEM_ERROR)
+                       die("inflate: out of memory");
+               zlib_post_call(strm);
+
+               /*
+                * Let zlib work another round, while we can still
+                * make progress.
+                */
+               if ((strm->avail_out && !strm->z.avail_out) &&
+                   (status == Z_OK || status == Z_BUF_ERROR))
+                       continue;
+               break;
+       }
 
        switch (status) {
        /* Z_BUF_ERROR: normal, needs more space in the output buffer */
@@ -52,13 +138,114 @@ int git_inflate(z_streamp strm, int flush)
        case Z_OK:
        case Z_STREAM_END:
                return status;
-
-       case Z_MEM_ERROR:
-               die("inflate: out of memory");
        default:
                break;
        }
        error("inflate: %s (%s)", zerr_to_string(status),
-             strm->msg ? strm->msg : "no message");
+             strm->z.msg ? strm->z.msg : "no message");
+       return status;
+}
+
+#if defined(NO_DEFLATE_BOUND) || ZLIB_VERNUM < 0x1200
+#define deflateBound(c,s)  ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
+#endif
+
+unsigned long git_deflate_bound(git_zstream *strm, unsigned long size)
+{
+       return deflateBound(&strm->z, size);
+}
+
+void git_deflate_init(git_zstream *strm, int level)
+{
+       int status;
+
+       zlib_pre_call(strm);
+       status = deflateInit(&strm->z, level);
+       zlib_post_call(strm);
+       if (status == Z_OK)
+               return;
+       die("deflateInit: %s (%s)", zerr_to_string(status),
+           strm->z.msg ? strm->z.msg : "no message");
+}
+
+void git_deflate_init_gzip(git_zstream *strm, int level)
+{
+       /*
+        * Use default 15 bits, +16 is to generate gzip header/trailer
+        * instead of the zlib wrapper.
+        */
+       const int windowBits = 15 + 16;
+       int status;
+
+       zlib_pre_call(strm);
+       status = deflateInit2(&strm->z, level,
+                                 Z_DEFLATED, windowBits,
+                                 8, Z_DEFAULT_STRATEGY);
+       zlib_post_call(strm);
+       if (status == Z_OK)
+               return;
+       die("deflateInit2: %s (%s)", zerr_to_string(status),
+           strm->z.msg ? strm->z.msg : "no message");
+}
+
+void git_deflate_end(git_zstream *strm)
+{
+       int status;
+
+       zlib_pre_call(strm);
+       status = deflateEnd(&strm->z);
+       zlib_post_call(strm);
+       if (status == Z_OK)
+               return;
+       error("deflateEnd: %s (%s)", zerr_to_string(status),
+             strm->z.msg ? strm->z.msg : "no message");
+}
+
+int git_deflate_end_gently(git_zstream *strm)
+{
+       int status;
+
+       zlib_pre_call(strm);
+       status = deflateEnd(&strm->z);
+       zlib_post_call(strm);
+       return status;
+}
+
+int git_deflate(git_zstream *strm, int flush)
+{
+       int status;
+
+       for (;;) {
+               zlib_pre_call(strm);
+
+               /* Never say Z_FINISH unless we are feeding everything */
+               status = deflate(&strm->z,
+                                (strm->z.avail_in != strm->avail_in)
+                                ? 0 : flush);
+               if (status == Z_MEM_ERROR)
+                       die("deflate: out of memory");
+               zlib_post_call(strm);
+
+               /*
+                * Let zlib work another round, while we can still
+                * make progress.
+                */
+               if ((strm->avail_out && !strm->z.avail_out) &&
+                   (status == Z_OK || status == Z_BUF_ERROR))
+                       continue;
+               break;
+       }
+
+       switch (status) {
+       /* Z_BUF_ERROR: normal, needs more space in the output buffer */
+       case Z_BUF_ERROR:
+       case Z_OK:
+       case Z_STREAM_END:
+               return status;
+       default:
+               break;
+       }
+       error("deflate: %s (%s)", zerr_to_string(status),
+             strm->z.msg ? strm->z.msg : "no message");
        return status;
 }