1 files changed, 138 insertions, 0 deletions
diff --git a/media/libav/libavutil/file.c b/media/libav/libavutil/file.c
new file mode 100644
index 000000000..d2765b849
--- /dev/null
+++ b/media/libav/libavutil/file.c
@@ -0,0 +1,138 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+#include "file.h"
+#include "internal.h"
+#include "log.h"
+#include "mem.h"
+#include <fcntl.h>
+#include <sys/stat.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if HAVE_IO_H
+#include <io.h>
+#endif
+#if HAVE_MMAP
+#include <sys/mman.h>
+#elif HAVE_MAPVIEWOFFILE
+#include <windows.h>
+#endif
+
+typedef struct {
+    const AVClass *class;
+    int   log_offset;
+    void *log_ctx;
+} FileLogContext;
+
+static const AVClass file_log_ctx_class = {
+    "FILE", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT,
+    offsetof(FileLogContext, log_offset), offsetof(FileLogContext, log_ctx)
+};
+
+int av_file_map(const char *filename, uint8_t **bufptr, size_t *size,
+                int log_offset, void *log_ctx)
+{
+    FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx };
+    int err, fd = avpriv_open(filename, O_RDONLY);
+    struct stat st;
+    av_unused void *ptr;
+    off_t off_size;
+    char errbuf[128];
+    *bufptr = NULL;
+
+    if (fd < 0) {
+        err = AVERROR(errno);
+        av_strerror(err, errbuf, sizeof(errbuf));
+        av_log(&file_log_ctx, AV_LOG_ERROR, "Cannot read file '%s': %s\n", filename, errbuf);
+        return err;
+    }
+
+    if (fstat(fd, &st) < 0) {
+        err = AVERROR(errno);
+        av_strerror(err, errbuf, sizeof(errbuf));
+        av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in fstat(): %s\n", errbuf);
+        close(fd);
+        return err;
+    }
+
+    off_size = st.st_size;
+    if (off_size > SIZE_MAX) {
+        av_log(&file_log_ctx, AV_LOG_ERROR,
+               "File size for file '%s' is too big\n", filename);
+        close(fd);
+        return AVERROR(EINVAL);
+    }
+    *size = off_size;
+
+#if HAVE_MMAP
+    ptr = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
+    if (ptr == MAP_FAILED) {
+        err = AVERROR(errno);
+        av_strerror(err, errbuf, sizeof(errbuf));
+        av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in mmap(): %s\n", errbuf);
+        close(fd);
+        return err;
+    }
+    *bufptr = ptr;
+#elif HAVE_MAPVIEWOFFILE
+    {
+        HANDLE mh, fh = (HANDLE)_get_osfhandle(fd);
+
+        mh = CreateFileMapping(fh, NULL, PAGE_READONLY, 0, 0, NULL);
+        if (!mh) {
+            av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in CreateFileMapping()\n");
+            close(fd);
+            return -1;
+        }
+
+        ptr = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, *size);
+        CloseHandle(mh);
+        if (!ptr) {
+            av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in MapViewOfFile()\n");
+            close(fd);
+            return -1;
+        }
+
+        *bufptr = ptr;
+    }
+#else
+    *bufptr = av_malloc(*size);
+    if (!*bufptr) {
+        av_log(&file_log_ctx, AV_LOG_ERROR, "Memory allocation error occurred\n");
+        close(fd);
+        return AVERROR(ENOMEM);
+    }
+    read(fd, *bufptr, *size);
+#endif
+
+    close(fd);
+    return 0;
+}
+
+void av_file_unmap(uint8_t *bufptr, size_t size)
+{
+#if HAVE_MMAP
+    munmap(bufptr, size);
+#elif HAVE_MAPVIEWOFFILE
+    UnmapViewOfFile(bufptr);
+#else
+    av_free(bufptr);
+#endif
+}