ffmpeg-2.1.1: move directory

git-svn-id: svn://kolibrios.org@6148 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.1/libavutil/file.c

@@ -0,0 +1,199 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; 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_MMAP
+#include <sys/mman.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
+}
+
+int av_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx) {
+    FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx };
+    int fd=-1;
+#if !HAVE_MKSTEMP
+    void *ptr= tempnam(NULL, prefix);
+    if(!ptr)
+        ptr= tempnam(".", prefix);
+    *filename = av_strdup(ptr);
+#undef free
+    free(ptr);
+#else
+    size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
+    *filename = av_malloc(len);
+#endif
+    /* -----common section-----*/
+    if (*filename == NULL) {
+        av_log(&file_log_ctx, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
+        return AVERROR(ENOMEM);
+    }
+#if !HAVE_MKSTEMP
+#   ifndef O_BINARY
+#       define O_BINARY 0
+#   endif
+#   ifndef O_EXCL
+#       define O_EXCL 0
+#   endif
+    fd = open(*filename, O_RDWR | O_BINARY | O_CREAT | O_EXCL, 0600);
+#else
+    snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
+    fd = mkstemp(*filename);
+#ifdef _WIN32
+    if (fd < 0) {
+        snprintf(*filename, len, "./%sXXXXXX", prefix);
+        fd = mkstemp(*filename);
+    }
+#endif
+#endif
+    /* -----common section-----*/
+    if (fd < 0) {
+        int err = AVERROR(errno);
+        av_log(&file_log_ctx, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
+        av_freep(filename);
+        return err;
+    }
+    return fd; /* success */
+}
+
+#ifdef TEST
+
+#undef printf
+
+int main(void)
+{
+    uint8_t *buf;
+    size_t size;
+    if (av_file_map("file.c", &buf, &size, 0, NULL) < 0)
+        return 1;
+
+    buf[0] = 's';
+    printf("%s", buf);
+    av_file_unmap(buf, size);
+    return 0;
+}
+#endif
+