Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1

Summary: Imported nx-X11-3.1.0-1.tar.gz
Keywords:

Imported nx-X11-3.1.0-1.tar.gz
into Git repository

1 files changed, 227 insertions, 0 deletions

diff --git a/nx-X11/lib/font/fontfile/gunzip.c b/nx-X11/lib/font/fontfile/gunzip.c
new file mode 100644
index 000000000..8c9c317aa
--- /dev/null
+++ b/nx-X11/lib/font/fontfile/gunzip.c
@@ -0,0 +1,227 @@
+/* $Xorg: gunzip.c,v 1.3 2000/08/17 19:46:37 cpqbld Exp $ */
+/* lib/font/fontfile/gunzip.c
+   written by Mark Eichin <eichin@kitten.gen.ma.us> September 1996.
+   intended for inclusion in X11 public releases. */
+/* $XFree86: xc/lib/font/fontfile/gunzip.c,v 1.4 2000/09/19 12:46:08 eich Exp $ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <X11/fonts/fontmisc.h>
+#include <X11/fonts/bufio.h>
+#include <zlib.h>
+
+typedef struct _xzip_buf {
+  z_stream z;
+  int zstat;
+  BufChar b[BUFFILESIZE];
+  BufChar b_in[BUFFILESIZE];
+  BufFilePtr f;
+} xzip_buf;
+
+static int BufZipFileClose ( BufFilePtr f, int flag );
+static int BufZipFileFill ( BufFilePtr f );
+static int BufZipFileSkip ( BufFilePtr f, int c );
+static int BufCheckZipHeader ( BufFilePtr f );
+
+BufFilePtr
+BufFilePushZIP (BufFilePtr f)
+{
+  xzip_buf *x;
+
+  x = (xzip_buf *) xalloc (sizeof (xzip_buf));
+  if (!x) return 0;
+  /* these are just for raw calloc/free */
+  x->z.zalloc = Z_NULL;
+  x->z.zfree = Z_NULL;
+  x->z.opaque = Z_NULL;
+  x->f = f;
+
+  /* force inflateInit to allocate it's own history buffer */
+  x->z.next_in = Z_NULL;
+  x->z.next_out = Z_NULL;
+  x->z.avail_in = x->z.avail_out = 0;
+
+  /* using negative windowBits sets "nowrap" mode, which turns off
+     zlib header checking [undocumented, for gzip compatibility only?] */
+  x->zstat = inflateInit2(&(x->z), -MAX_WBITS);
+  if (x->zstat != Z_OK) {
+    xfree(x);
+    return 0;
+  }
+
+  /* now that the history buffer is allocated, we provide the data buffer */
+  x->z.next_out = x->b;
+  x->z.avail_out = BUFFILESIZE;
+  x->z.next_out = x->b_in;
+  x->z.avail_in = 0;
+
+  if (BufCheckZipHeader(x->f)) {
+    xfree(x);
+    return 0;
+  }
+
+  return BufFileCreate((char *)x,
+		       BufZipFileFill,
+		       0,
+		       BufZipFileSkip,
+		       BufZipFileClose);
+}
+
+static int 
+BufZipFileClose(BufFilePtr f, int flag)
+{
+  xzip_buf *x = (xzip_buf *)f->private;
+  inflateEnd (&(x->z));
+  BufFileClose (x->f, flag);
+  xfree (x);
+  return 1;
+}
+
+/* here's the real work. 
+   -- we need to put stuff in f.buffer, update f.left and f.bufp,
+      then return the first byte (or BUFFILEEOF).
+   -- to do this, we need to get stuff into avail_in, and next_in, 
+      and call inflate appropriately.
+   -- we may also need to add CRC maintenance - if inflate tells us
+      Z_STREAM_END, we then have 4bytes CRC and 4bytes length...
+   gzio.c:gzread shows most of the mechanism.
+   */
+static int 
+BufZipFileFill (BufFilePtr f)
+{
+  xzip_buf *x = (xzip_buf *)f->private;
+
+  /* we only get called when left == 0... */
+  /* but just in case, deal */
+  if (f->left >= 0) {
+    f->left--;
+    return *(f->bufp++);
+  }
+  /* did we run out last time? */
+  switch (x->zstat) {
+  case Z_OK:
+    break;
+  case Z_STREAM_END:
+  case Z_DATA_ERROR:
+  case Z_ERRNO:
+      f->left = 0;
+      return BUFFILEEOF;
+  default:
+    return BUFFILEEOF;
+  }
+  /* now we work to consume what we can */
+  /* let zlib know what we can handle */
+  x->z.next_out = x->b;
+  x->z.avail_out = BUFFILESIZE;
+
+  /* and try to consume all of it */
+  while (x->z.avail_out > 0) {
+    /* if we don't have anything to work from... */
+    if (x->z.avail_in == 0) {
+      /* ... fill the z buf from underlying file */
+      int i, c;
+      for (i = 0; i < sizeof(x->b_in); i++) {
+	c = BufFileGet(x->f);
+	if (c == BUFFILEEOF) break;
+	x->b_in[i] = c;
+      }
+      x->z.avail_in += i;
+      x->z.next_in = x->b_in;
+    }
+    /* so now we have some output space and some input data */
+    x->zstat = inflate(&(x->z), Z_NO_FLUSH);
+    /* the inflation output happens in the f buffer directly... */
+    if (x->zstat == Z_STREAM_END) {
+      /* deal with EOF, crc */
+      break;
+    }
+    if (x->zstat != Z_OK) {
+      break;
+    }
+  }
+  f->bufp = x->b;
+  f->left = BUFFILESIZE - x->z.avail_out;  
+
+  if (f->left >= 0) {
+    f->left--;
+    return *(f->bufp++);
+  } else {
+    return BUFFILEEOF;
+  }
+}
+
+/* there should be a BufCommonSkip... */
+static int 
+BufZipFileSkip (BufFilePtr f, int c)
+{
+  /* BufFileRawSkip returns the count unchanged.
+     BufCompressedSkip returns 0.
+     That means it probably never gets called... */
+  int retval = c;
+  while(c--) {
+    int get = BufFileGet(f);
+    if (get == BUFFILEEOF) return get;
+  }
+  return retval;
+}
+
+/* now we need to duplicate check_header */
+/* contents:
+     0x1f, 0x8b	-- magic number
+     1 byte	-- method (Z_DEFLATED)
+     1 byte	-- flags (mask with RESERVED -> fail)
+     4 byte	-- time (discard)
+     1 byte	-- xflags (discard)
+     1 byte	-- "os" code (discard)
+     [if flags & EXTRA_FIELD:
+         2 bytes -- LSBfirst length n
+	 n bytes -- extra data (discard)]
+     [if flags & ORIG_NAME:
+	 n bytes -- null terminated name (discard)]
+     [if flags & COMMENT:
+	 n bytes -- null terminated comment (discard)]
+     [if flags & HEAD_CRC:
+         2 bytes -- crc of headers? (discard)]
+ */
+
+/* gzip flag byte -- from gzio.c */
+#define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
+#define HEAD_CRC     0x02 /* bit 1 set: header CRC present */
+#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
+#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
+#define COMMENT      0x10 /* bit 4 set: file comment present */
+#define RESERVED     0xE0 /* bits 5..7: reserved */
+
+#define GET(f) do {c = BufFileGet(f); if (c == BUFFILEEOF) return c;} while(0)
+static int 
+BufCheckZipHeader(BufFilePtr f)
+{
+  int c, flags;
+  GET(f); if (c != 0x1f) return 1; /* magic 1 */
+  GET(f); if (c != 0x8b) return 2; /* magic 2 */
+  GET(f); if (c != Z_DEFLATED) return 3; /* method */
+  GET(f); if (c & RESERVED) return 4; /* reserved flags */
+  flags = c;
+  GET(f); GET(f); GET(f); GET(f); /* time */
+  GET(f);			/* xflags */
+  GET(f);			/* os code */
+  if (flags & EXTRA_FIELD) {
+    int len;
+    GET(f); len = c;
+    GET(f); len += (c<<8);
+    while (len-- >= 0) {
+      GET(f);
+    }
+  }
+  if (flags & ORIG_NAME) {
+    do { GET(f); } while (c != 0);
+  }
+  if (flags & COMMENT) {
+    do { GET(f); } while (c != 0);
+  }
+  if (flags & HEAD_CRC) {
+    GET(f); GET(f);		/* header crc */
+  }
+  return 0;
+}