358 lines
11 KiB
C
358 lines
11 KiB
C
/*
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* Copyright (C) 2014-2019 Amlogic, Inc. All rights reserved.
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*
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* All information contained herein is Amlogic confidential.
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*
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* This software is provided to you pursuant to Software License Agreement
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* (SLA) with Amlogic Inc ("Amlogic"). This software may be used
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* only in accordance with the terms of this agreement.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification is strictly prohibited without prior written permission from
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* Amlogic.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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// #include <avassert.h>
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// #include <avstring.h>
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#include "bprint.h"
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// #include <common.h>
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// #include "compat/va_copy.h"
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// #include "error.h"
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// #include "mem.h"
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#define av_bprint_room(buf) ((buf)->size - FFMIN((buf)->len, (buf)->size))
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#define av_bprint_is_allocated(buf) ((buf)->str != (buf)->reserved_internal_buffer)
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#if 1
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#if 1
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void *av_realloc(void *ptr, unsigned int size) {
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return realloc(ptr, size);
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}
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void *av_malloc(unsigned int size) {
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void *ptr = NULL;
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ptr = malloc(size);
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return ptr;
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}
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void av_freep(void **arg) {
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if (*arg) free(*arg);
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*arg = NULL;
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}
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void av_free(void *arg) {
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if (arg) free(arg);
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}
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void *av_mallocz(unsigned int size) {
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void *ptr = malloc(size);
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if (ptr) memset(ptr, 0, size);
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return ptr;
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}
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#endif
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int ff_fast_malloc(void *ptr, unsigned int *size, size_t min_size, int zero_realloc) {
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void *val;
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memcpy(&val, ptr, sizeof(val));
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if (min_size <= *size) {
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// av_assert0(val || !min_size);
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return 0;
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}
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min_size = FFMAX(min_size + min_size / 16 + 32, min_size);
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av_freep(ptr);
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val = zero_realloc ? av_mallocz(min_size) : av_malloc(min_size);
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memcpy(ptr, &val, sizeof(val));
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if (!val) {
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av_free(val);
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min_size = 0;
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}
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*size = min_size;
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return 1;
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}
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void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size) {
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uint8_t **p = ptr;
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if (min_size > SIZE_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
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av_freep((void **)p);
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*size = 0;
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return;
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}
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if (!ff_fast_malloc(p, size, min_size + AV_INPUT_BUFFER_PADDING_SIZE, 1))
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memset(*p + min_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
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}
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#endif
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static int av_bprint_alloc(AVBPrint *buf, unsigned room) {
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char *old_str, *new_str;
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unsigned min_size, new_size;
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if (buf->size == buf->size_max) return -1;
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if (!av_bprint_is_complete(buf)) return -1; /* it is already truncated anyway */
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min_size = buf->len + 1 + FFMIN(UINT_MAX - buf->len - 1, room);
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new_size = buf->size > buf->size_max / 2 ? buf->size_max : buf->size * 2;
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if (new_size < min_size) new_size = FFMIN(buf->size_max, min_size);
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old_str = av_bprint_is_allocated(buf) ? buf->str : NULL;
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new_str = av_realloc(old_str, new_size);
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if (!new_str) return -1;
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if (!old_str) memcpy(new_str, buf->str, buf->len + 1);
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buf->str = new_str;
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buf->size = new_size;
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return 0;
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}
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static void av_bprint_grow(AVBPrint *buf, unsigned extra_len) {
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/* arbitrary margin to avoid small overflows */
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extra_len = FFMIN(extra_len, UINT_MAX - 5 - buf->len);
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buf->len += extra_len;
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if (buf->size) buf->str[FFMIN(buf->len, buf->size - 1)] = 0;
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}
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void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max) {
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unsigned size_auto = (char *)buf + sizeof(*buf) - buf->reserved_internal_buffer;
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if (size_max == 1) size_max = size_auto;
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buf->str = buf->reserved_internal_buffer;
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buf->len = 0;
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buf->size = FFMIN(size_auto, size_max);
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buf->size_max = size_max;
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*buf->str = 0;
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if (size_init > buf->size) av_bprint_alloc(buf, size_init - 1);
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}
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#if 0
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void av_bprint_init_for_buffer(AVBPrint *buf, char *buffer, unsigned size)
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{
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buf->str = buffer;
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buf->len = 0;
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buf->size = size;
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buf->size_max = size;
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*buf->str = 0;
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}
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#endif
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void av_bprintf(AVBPrint *buf, const char *fmt, ...) {
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unsigned int room = 0;
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char *dst;
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va_list vl;
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unsigned int extra_len = 0;
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while (1) {
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room = av_bprint_room(buf);
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dst = room ? buf->str + buf->len : NULL;
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va_start(vl, fmt);
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extra_len = vsnprintf(dst, room, fmt, vl);
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va_end(vl);
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if (extra_len <= 0) return;
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if (extra_len < room) break;
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if (av_bprint_alloc(buf, extra_len)) break;
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}
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av_bprint_grow(buf, extra_len);
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}
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#if 0
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void av_vbprintf(AVBPrint *buf, const char *fmt, va_list vl_arg)
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{
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unsigned room;
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char *dst;
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int extra_len;
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va_list vl;
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while (1) {
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room = av_bprint_room(buf);
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dst = room ? buf->str + buf->len : NULL;
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va_copy(vl, vl_arg);
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extra_len = vsnprintf(dst, room, fmt, vl);
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va_end(vl);
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if (extra_len <= 0)
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return;
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if (extra_len < room)
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break;
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if (av_bprint_alloc(buf, extra_len))
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break;
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}
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av_bprint_grow(buf, extra_len);
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}
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void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
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{
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unsigned room, real_n;
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while (1) {
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room = av_bprint_room(buf);
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if (n < room)
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break;
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if (av_bprint_alloc(buf, n))
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break;
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}
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if (room) {
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real_n = FFMIN(n, room - 1);
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memset(buf->str + buf->len, c, real_n);
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}
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av_bprint_grow(buf, n);
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}
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void av_bprint_append_data(AVBPrint *buf, const char *data, unsigned size)
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{
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unsigned room, real_n;
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while (1) {
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room = av_bprint_room(buf);
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if (size < room)
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break;
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if (av_bprint_alloc(buf, size))
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break;
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}
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if (room) {
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real_n = FFMIN(size, room - 1);
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memcpy(buf->str + buf->len, data, real_n);
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}
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av_bprint_grow(buf, size);
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}
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void av_bprint_strftime(AVBPrint *buf, const char *fmt, const struct tm *tm)
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{
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unsigned room;
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size_t l;
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if (!*fmt)
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return;
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while (1) {
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room = av_bprint_room(buf);
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if (room && (l = strftime(buf->str + buf->len, room, fmt, tm)))
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break;
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/* strftime does not tell us how much room it would need: let us
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retry with twice as much until the buffer is large enough */
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room = !room ? strlen(fmt) + 1 :
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room <= INT_MAX / 2 ? room * 2 : INT_MAX;
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if (av_bprint_alloc(buf, room)) {
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/* impossible to grow, try to manage something useful anyway */
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room = av_bprint_room(buf);
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if (room < 1024) {
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/* if strftime fails because the buffer has (almost) reached
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its maximum size, let us try in a local buffer; 1k should
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be enough to format any real date+time string */
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char buf2[1024];
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if ((l = strftime(buf2, sizeof(buf2), fmt, tm))) {
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av_bprintf(buf, "%s", buf2);
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return;
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}
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}
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if (room) {
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/* if anything else failed and the buffer is not already
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truncated, let us add a stock string and force truncation */
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static const char txt[] = "[truncated strftime output]";
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memset(buf->str + buf->len, '!', room);
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memcpy(buf->str + buf->len, txt, FFMIN(sizeof(txt) - 1, room));
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av_bprint_grow(buf, room); /* force truncation */
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}
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return;
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}
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}
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av_bprint_grow(buf, l);
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}
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void av_bprint_get_buffer(AVBPrint *buf, unsigned size,
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unsigned char **mem, unsigned *actual_size)
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{
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if (size > av_bprint_room(buf))
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av_bprint_alloc(buf, size);
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*actual_size = av_bprint_room(buf);
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*mem = *actual_size ? buf->str + buf->len : NULL;
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}
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#endif
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void av_bprint_clear(AVBPrint *buf) {
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if (buf->len) {
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*buf->str = 0;
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buf->len = 0;
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}
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}
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int av_bprint_finalize(AVBPrint *buf, char **ret_str) {
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unsigned real_size = FFMIN(buf->len + 1, buf->size);
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char *str;
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int ret = 0;
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if (ret_str) {
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if (av_bprint_is_allocated(buf)) {
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str = av_realloc(buf->str, real_size);
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if (!str) str = buf->str;
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buf->str = NULL;
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} else {
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str = av_malloc(real_size);
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if (str)
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memcpy(str, buf->str, real_size);
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else
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ret = -1; // AVERROR(ENOMEM);
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}
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*ret_str = str;
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} else {
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if (av_bprint_is_allocated(buf)) av_freep((void **)(&buf->str));
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}
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buf->size = real_size;
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return ret;
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}
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#if 0
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#define WHITESPACES " \n\t\r"
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void av_bprint_escape(AVBPrint *dstbuf, const char *src, const char *special_chars,
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enum AVEscapeMode mode, int flags)
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{
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const char *src0 = src;
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if (mode == AV_ESCAPE_MODE_AUTO)
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mode = AV_ESCAPE_MODE_BACKSLASH; /* TODO: implement a heuristic */
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switch (mode) {
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case AV_ESCAPE_MODE_QUOTE:
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/* enclose the string between '' */
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av_bprint_chars(dstbuf, '\'', 1);
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for (; *src; src++) {
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if (*src == '\'')
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av_bprintf(dstbuf, "'\\''");
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else
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av_bprint_chars(dstbuf, *src, 1);
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}
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av_bprint_chars(dstbuf, '\'', 1);
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break;
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/* case AV_ESCAPE_MODE_BACKSLASH or unknown mode */
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default:
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/* \-escape characters */
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for (; *src; src++) {
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int is_first_last = src == src0 || !*(src+1);
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int is_ws = !!strchr(WHITESPACES, *src);
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int is_strictly_special = special_chars && strchr(special_chars, *src);
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int is_special =
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is_strictly_special || strchr("'\\", *src) ||
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(is_ws && (flags & AV_ESCAPE_FLAG_WHITESPACE));
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if (is_strictly_special ||
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(!(flags & AV_ESCAPE_FLAG_STRICT) &&
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(is_special || (is_ws && is_first_last))))
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av_bprint_chars(dstbuf, '\\', 1);
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av_bprint_chars(dstbuf, *src, 1);
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}
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break;
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}
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}
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#endif
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