1 files changed, 271 insertions, 0 deletions
diff --git a/src/jpeg-6/jmemname.c b/src/jpeg-6/jmemname.c
new file mode 100644
index 0000000..ba826fb
--- /dev/null
+++ b/src/jpeg-6/jmemname.c
@@ -0,0 +1,271 @@
+/*
+ * jmemname.c
+ *
+ * Copyright (C) 1992-1994, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file provides a generic implementation of the system-dependent
+ * portion of the JPEG memory manager.  This implementation assumes that
+ * you must explicitly construct a name for each temp file.
+ * Also, the problem of determining the amount of memory available
+ * is shoved onto the user.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jmemsys.h"		/* import the system-dependent declarations */
+
+#ifndef HAVE_STDLIB_H		/* <stdlib.h> should declare malloc(),free() */
+extern void * malloc JPP((size_t size));
+extern void free JPP((void *ptr));
+#endif
+
+#ifndef SEEK_SET		/* pre-ANSI systems may not define this; */
+#define SEEK_SET  0		/* if not, assume 0 is correct */
+#endif
+
+#ifdef DONT_USE_B_MODE		/* define mode parameters for fopen() */
+#define READ_BINARY	"r"
+#define RW_BINARY	"w+"
+#else
+#define READ_BINARY	"rb"
+#define RW_BINARY	"w+b"
+#endif
+
+
+/*
+ * Selection of a file name for a temporary file.
+ * This is system-dependent!
+ *
+ * The code as given is suitable for most Unix systems, and it is easily
+ * modified for most non-Unix systems.  Some notes:
+ *  1.  The temp file is created in the directory named by TEMP_DIRECTORY.
+ *      The default value is /usr/tmp, which is the conventional place for
+ *      creating large temp files on Unix.  On other systems you'll probably
+ *      want to change the file location.  You can do this by editing the
+ *      #define, or (preferred) by defining TEMP_DIRECTORY in jconfig.h.
+ *
+ *  2.  If you need to change the file name as well as its location,
+ *      you can override the TEMP_FILE_NAME macro.  (Note that this is
+ *      actually a printf format string; it must contain %s and %d.)
+ *      Few people should need to do this.
+ *
+ *  3.  mktemp() is used to ensure that multiple processes running
+ *      simultaneously won't select the same file names.  If your system
+ *      doesn't have mktemp(), define NO_MKTEMP to do it the hard way.
+ *      (If you don't have <errno.h>, also define NO_ERRNO_H.)
+ *
+ *  4.  You probably want to define NEED_SIGNAL_CATCHER so that cjpeg.c/djpeg.c
+ *      will cause the temp files to be removed if you stop the program early.
+ */
+
+#ifndef TEMP_DIRECTORY		/* can override from jconfig.h or Makefile */
+#define TEMP_DIRECTORY  "/usr/tmp/" /* recommended setting for Unix */
+#endif
+
+static int next_file_num;	/* to distinguish among several temp files */
+
+#ifdef NO_MKTEMP
+
+#ifndef TEMP_FILE_NAME		/* can override from jconfig.h or Makefile */
+#define TEMP_FILE_NAME  "%sJPG%03d.TMP"
+#endif
+
+#ifndef NO_ERRNO_H
+#include <errno.h>		/* to define ENOENT */
+#endif
+
+/* ANSI C specifies that errno is a macro, but on older systems it's more
+ * likely to be a plain int variable.  And not all versions of errno.h
+ * bother to declare it, so we have to in order to be most portable.  Thus:
+ */
+#ifndef errno
+extern int errno;
+#endif
+
+
+LOCAL void
+select_file_name (char * fname)
+{
+  FILE * tfile;
+
+  /* Keep generating file names till we find one that's not in use */
+  for (;;) {
+    next_file_num++;		/* advance counter */
+    sprintf(fname, TEMP_FILE_NAME, TEMP_DIRECTORY, next_file_num);
+    if ((tfile = fopen(fname, READ_BINARY)) == NULL) {
+      /* fopen could have failed for a reason other than the file not
+       * being there; for example, file there but unreadable.
+       * If <errno.h> isn't available, then we cannot test the cause.
+       */
+#ifdef ENOENT
+      if (errno != ENOENT)
+	continue;
+#endif
+      break;
+    }
+    fclose(tfile);		/* oops, it's there; close tfile & try again */
+  }
+}
+
+#else /* ! NO_MKTEMP */
+
+/* Note that mktemp() requires the initial filename to end in six X's */
+#ifndef TEMP_FILE_NAME		/* can override from jconfig.h or Makefile */
+#define TEMP_FILE_NAME  "%sJPG%dXXXXXX"
+#endif
+
+LOCAL void
+select_file_name (char * fname)
+{
+  next_file_num++;		/* advance counter */
+  sprintf(fname, TEMP_FILE_NAME, TEMP_DIRECTORY, next_file_num);
+  mktemp(fname);		/* make sure file name is unique */
+  /* mktemp replaces the trailing XXXXXX with a unique string of characters */
+}
+
+#endif /* NO_MKTEMP */
+
+
+/*
+ * Memory allocation and freeing are controlled by the regular library
+ * routines malloc() and free().
+ */
+
+GLOBAL void *
+jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
+{
+  return (void *) malloc(sizeofobject);
+}
+
+GLOBAL void
+jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)
+{
+  free(object);
+}
+
+
+/*
+ * "Large" objects are treated the same as "small" ones.
+ * NB: although we include FAR keywords in the routine declarations,
+ * this file won't actually work in 80x86 small/medium model; at least,
+ * you probably won't be able to process useful-size images in only 64KB.
+ */
+
+GLOBAL void FAR *
+jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
+{
+  return (void FAR *) malloc(sizeofobject);
+}
+
+GLOBAL void
+jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
+{
+  free(object);
+}
+
+
+/*
+ * This routine computes the total memory space available for allocation.
+ * It's impossible to do this in a portable way; our current solution is
+ * to make the user tell us (with a default value set at compile time).
+ * If you can actually get the available space, it's a good idea to subtract
+ * a slop factor of 5% or so.
+ */
+
+#ifndef DEFAULT_MAX_MEM		/* so can override from makefile */
+#define DEFAULT_MAX_MEM		1000000L /* default: one megabyte */
+#endif
+
+GLOBAL long
+jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,
+		    long max_bytes_needed, long already_allocated)
+{
+  return cinfo->mem->max_memory_to_use - already_allocated;
+}
+
+
+/*
+ * Backing store (temporary file) management.
+ * Backing store objects are only used when the value returned by
+ * jpeg_mem_available is less than the total space needed.  You can dispense
+ * with these routines if you have plenty of virtual memory; see jmemnobs.c.
+ */
+
+
+METHODDEF void
+read_backing_store (j_common_ptr cinfo, backing_store_ptr info,
+		    void FAR * buffer_address,
+		    long file_offset, long byte_count)
+{
+  if (fseek(info->temp_file, file_offset, SEEK_SET))
+    ERREXIT(cinfo, JERR_TFILE_SEEK);
+  if (JFREAD(info->temp_file, buffer_address, byte_count)
+      != (size_t) byte_count)
+    ERREXIT(cinfo, JERR_TFILE_READ);
+}
+
+
+METHODDEF void
+write_backing_store (j_common_ptr cinfo, backing_store_ptr info,
+		     void FAR * buffer_address,
+		     long file_offset, long byte_count)
+{
+  if (fseek(info->temp_file, file_offset, SEEK_SET))
+    ERREXIT(cinfo, JERR_TFILE_SEEK);
+  if (JFWRITE(info->temp_file, buffer_address, byte_count)
+      != (size_t) byte_count)
+    ERREXIT(cinfo, JERR_TFILE_WRITE);
+}
+
+
+METHODDEF void
+close_backing_store (j_common_ptr cinfo, backing_store_ptr info)
+{
+  fclose(info->temp_file);	/* close the file */
+  unlink(info->temp_name);	/* delete the file */
+/* If your system doesn't have unlink(), use remove() instead.
+ * remove() is the ANSI-standard name for this function, but if
+ * your system was ANSI you'd be using jmemansi.c, right?
+ */
+  TRACEMSS(cinfo, 1, JTRC_TFILE_CLOSE, info->temp_name);
+}
+
+
+/*
+ * Initial opening of a backing-store object.
+ */
+
+GLOBAL void
+jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
+			 long total_bytes_needed)
+{
+  select_file_name(info->temp_name);
+  if ((info->temp_file = fopen(info->temp_name, RW_BINARY)) == NULL)
+    ERREXITS(cinfo, JERR_TFILE_CREATE, info->temp_name);
+  info->read_backing_store = read_backing_store;
+  info->write_backing_store = write_backing_store;
+  info->close_backing_store = close_backing_store;
+  TRACEMSS(cinfo, 1, JTRC_TFILE_OPEN, info->temp_name);
+}
+
+
+/*
+ * These routines take care of any system-dependent initialization and
+ * cleanup required.
+ */
+
+GLOBAL long
+jpeg_mem_init (j_common_ptr cinfo)
+{
+  next_file_num = 0;		/* initialize temp file name generator */
+  return DEFAULT_MAX_MEM;	/* default for max_memory_to_use */
+}
+
+GLOBAL void
+jpeg_mem_term (j_common_ptr cinfo)
+{
+  /* no work */
+}