Add m-esr52 at 52.6.0

1 files changed, 305 insertions, 0 deletions

diff --git a/media/ffvpx/libavutil/bprint.c b/media/ffvpx/libavutil/bprint.c
new file mode 100644
index 000000000..2f059c5ba
--- /dev/null
+++ b/media/ffvpx/libavutil/bprint.c
@@ -0,0 +1,305 @@
+/*
+ * Copyright (c) 2012 Nicolas George
+ *
+ * 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 <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include "avassert.h"
+#include "avstring.h"
+#include "bprint.h"
+#include "common.h"
+#include "compat/va_copy.h"
+#include "error.h"
+#include "mem.h"
+
+#define av_bprint_room(buf) ((buf)->size - FFMIN((buf)->len, (buf)->size))
+#define av_bprint_is_allocated(buf) ((buf)->str != (buf)->reserved_internal_buffer)
+
+static int av_bprint_alloc(AVBPrint *buf, unsigned room)
+{
+    char *old_str, *new_str;
+    unsigned min_size, new_size;
+
+    if (buf->size == buf->size_max)
+        return AVERROR(EIO);
+    if (!av_bprint_is_complete(buf))
+        return AVERROR_INVALIDDATA; /* it is already truncated anyway */
+    min_size = buf->len + 1 + FFMIN(UINT_MAX - buf->len - 1, room);
+    new_size = buf->size > buf->size_max / 2 ? buf->size_max : buf->size * 2;
+    if (new_size < min_size)
+        new_size = FFMIN(buf->size_max, min_size);
+    old_str = av_bprint_is_allocated(buf) ? buf->str : NULL;
+    new_str = av_realloc(old_str, new_size);
+    if (!new_str)
+        return AVERROR(ENOMEM);
+    if (!old_str)
+        memcpy(new_str, buf->str, buf->len + 1);
+    buf->str  = new_str;
+    buf->size = new_size;
+    return 0;
+}
+
+static void av_bprint_grow(AVBPrint *buf, unsigned extra_len)
+{
+    /* arbitrary margin to avoid small overflows */
+    extra_len = FFMIN(extra_len, UINT_MAX - 5 - buf->len);
+    buf->len += extra_len;
+    if (buf->size)
+        buf->str[FFMIN(buf->len, buf->size - 1)] = 0;
+}
+
+void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
+{
+    unsigned size_auto = (char *)buf + sizeof(*buf) -
+                         buf->reserved_internal_buffer;
+
+    if (size_max == 1)
+        size_max = size_auto;
+    buf->str      = buf->reserved_internal_buffer;
+    buf->len      = 0;
+    buf->size     = FFMIN(size_auto, size_max);
+    buf->size_max = size_max;
+    *buf->str = 0;
+    if (size_init > buf->size)
+        av_bprint_alloc(buf, size_init - 1);
+}
+
+void av_bprint_init_for_buffer(AVBPrint *buf, char *buffer, unsigned size)
+{
+    buf->str      = buffer;
+    buf->len      = 0;
+    buf->size     = size;
+    buf->size_max = size;
+    *buf->str = 0;
+}
+
+void av_bprintf(AVBPrint *buf, const char *fmt, ...)
+{
+    unsigned room;
+    char *dst;
+    va_list vl;
+    int extra_len;
+
+    while (1) {
+        room = av_bprint_room(buf);
+        dst = room ? buf->str + buf->len : NULL;
+        va_start(vl, fmt);
+        extra_len = vsnprintf(dst, room, fmt, vl);
+        va_end(vl);
+        if (extra_len <= 0)
+            return;
+        if (extra_len < room)
+            break;
+        if (av_bprint_alloc(buf, extra_len))
+            break;
+    }
+    av_bprint_grow(buf, extra_len);
+}
+
+void av_vbprintf(AVBPrint *buf, const char *fmt, va_list vl_arg)
+{
+    unsigned room;
+    char *dst;
+    int extra_len;
+    va_list vl;
+
+    while (1) {
+        room = av_bprint_room(buf);
+        dst = room ? buf->str + buf->len : NULL;
+        va_copy(vl, vl_arg);
+        extra_len = vsnprintf(dst, room, fmt, vl);
+        va_end(vl);
+        if (extra_len <= 0)
+            return;
+        if (extra_len < room)
+            break;
+        if (av_bprint_alloc(buf, extra_len))
+            break;
+    }
+    av_bprint_grow(buf, extra_len);
+}
+
+void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
+{
+    unsigned room, real_n;
+
+    while (1) {
+        room = av_bprint_room(buf);
+        if (n < room)
+            break;
+        if (av_bprint_alloc(buf, n))
+            break;
+    }
+    if (room) {
+        real_n = FFMIN(n, room - 1);
+        memset(buf->str + buf->len, c, real_n);
+    }
+    av_bprint_grow(buf, n);
+}
+
+void av_bprint_append_data(AVBPrint *buf, const char *data, unsigned size)
+{
+    unsigned room, real_n;
+
+    while (1) {
+        room = av_bprint_room(buf);
+        if (size < room)
+            break;
+        if (av_bprint_alloc(buf, size))
+            break;
+    }
+    if (room) {
+        real_n = FFMIN(size, room - 1);
+        memcpy(buf->str + buf->len, data, real_n);
+    }
+    av_bprint_grow(buf, size);
+}
+
+void av_bprint_strftime(AVBPrint *buf, const char *fmt, const struct tm *tm)
+{
+    unsigned room;
+    size_t l;
+
+    if (!*fmt)
+        return;
+    while (1) {
+        room = av_bprint_room(buf);
+        if (room && (l = strftime(buf->str + buf->len, room, fmt, tm)))
+            break;
+        /* strftime does not tell us how much room it would need: let us
+           retry with twice as much until the buffer is large enough */
+        room = !room ? strlen(fmt) + 1 :
+               room <= INT_MAX / 2 ? room * 2 : INT_MAX;
+        if (av_bprint_alloc(buf, room)) {
+            /* impossible to grow, try to manage something useful anyway */
+            room = av_bprint_room(buf);
+            if (room < 1024) {
+                /* if strftime fails because the buffer has (almost) reached
+                   its maximum size, let us try in a local buffer; 1k should
+                   be enough to format any real date+time string */
+                char buf2[1024];
+                if ((l = strftime(buf2, sizeof(buf2), fmt, tm))) {
+                    av_bprintf(buf, "%s", buf2);
+                    return;
+                }
+            }
+            if (room) {
+                /* if anything else failed and the buffer is not already
+                   truncated, let us add a stock string and force truncation */
+                static const char txt[] = "[truncated strftime output]";
+                memset(buf->str + buf->len, '!', room);
+                memcpy(buf->str + buf->len, txt, FFMIN(sizeof(txt) - 1, room));
+                av_bprint_grow(buf, room); /* force truncation */
+            }
+            return;
+        }
+    }
+    av_bprint_grow(buf, l);
+}
+
+void av_bprint_get_buffer(AVBPrint *buf, unsigned size,
+                          unsigned char **mem, unsigned *actual_size)
+{
+    if (size > av_bprint_room(buf))
+        av_bprint_alloc(buf, size);
+    *actual_size = av_bprint_room(buf);
+    *mem = *actual_size ? buf->str + buf->len : NULL;
+}
+
+void av_bprint_clear(AVBPrint *buf)
+{
+    if (buf->len) {
+        *buf->str = 0;
+        buf->len  = 0;
+    }
+}
+
+int av_bprint_finalize(AVBPrint *buf, char **ret_str)
+{
+    unsigned real_size = FFMIN(buf->len + 1, buf->size);
+    char *str;
+    int ret = 0;
+
+    if (ret_str) {
+        if (av_bprint_is_allocated(buf)) {
+            str = av_realloc(buf->str, real_size);
+            if (!str)
+                str = buf->str;
+            buf->str = NULL;
+        } else {
+            str = av_malloc(real_size);
+            if (str)
+                memcpy(str, buf->str, real_size);
+            else
+                ret = AVERROR(ENOMEM);
+        }
+        *ret_str = str;
+    } else {
+        if (av_bprint_is_allocated(buf))
+            av_freep(&buf->str);
+    }
+    buf->size = real_size;
+    return ret;
+}
+
+#define WHITESPACES " \n\t\r"
+
+void av_bprint_escape(AVBPrint *dstbuf, const char *src, const char *special_chars,
+                      enum AVEscapeMode mode, int flags)
+{
+    const char *src0 = src;
+
+    if (mode == AV_ESCAPE_MODE_AUTO)
+        mode = AV_ESCAPE_MODE_BACKSLASH; /* TODO: implement a heuristic */
+
+    switch (mode) {
+    case AV_ESCAPE_MODE_QUOTE:
+        /* enclose the string between '' */
+        av_bprint_chars(dstbuf, '\'', 1);
+        for (; *src; src++) {
+            if (*src == '\'')
+                av_bprintf(dstbuf, "'\\''");
+            else
+                av_bprint_chars(dstbuf, *src, 1);
+        }
+        av_bprint_chars(dstbuf, '\'', 1);
+        break;
+
+    /* case AV_ESCAPE_MODE_BACKSLASH or unknown mode */
+    default:
+        /* \-escape characters */
+        for (; *src; src++) {
+            int is_first_last       = src == src0 || !*(src+1);
+            int is_ws               = !!strchr(WHITESPACES, *src);
+            int is_strictly_special = special_chars && strchr(special_chars, *src);
+            int is_special          =
+                is_strictly_special || strchr("'\\", *src) ||
+                (is_ws && (flags & AV_ESCAPE_FLAG_WHITESPACE));
+
+            if (is_strictly_special ||
+                (!(flags & AV_ESCAPE_FLAG_STRICT) &&
+                 (is_special || (is_ws && is_first_last))))
+                av_bprint_chars(dstbuf, '\\', 1);
+            av_bprint_chars(dstbuf, *src, 1);
+        }
+        break;
+    }
+}