X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Faviobuf.c;h=fb941c6e622b0c15b1a4ef4a709cda8cbcd1f0b7;hb=bde2bba45c2f2df27a8534028bda09a6e7f835e2;hp=da836c6fd5d3c865e9e806d0b3b67e9fdfa5af75;hpb=b522000e9b2ca36fe5b2751096b9a5f5ed8f87e6;p=ffmpeg

diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index da836c6fd5d..fb941c6e622 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -40,28 +40,28 @@
  */
 #define SHORT_SEEK_THRESHOLD 4096
 
-static void *ffio_url_child_next(void *obj, void *prev)
+static void *ff_avio_child_next(void *obj, void *prev)
 {
     AVIOContext *s = obj;
     return prev ? NULL : s->opaque;
 }
 
-static const AVClass *ffio_url_child_class_next(const AVClass *prev)
+static const AVClass *ff_avio_child_class_next(const AVClass *prev)
 {
     return prev ? NULL : &ffurl_context_class;
 }
 
-static const AVOption ffio_url_options[] = {
+static const AVOption ff_avio_options[] = {
     { NULL },
 };
 
-const AVClass ffio_url_class = {
+const AVClass ff_avio_class = {
     .class_name = "AVIOContext",
     .item_name  = av_default_item_name,
     .version    = LIBAVUTIL_VERSION_INT,
-    .option     = ffio_url_options,
-    .child_next = ffio_url_child_next,
-    .child_class_next = ffio_url_child_class_next,
+    .option     = ff_avio_options,
+    .child_next = ff_avio_child_next,
+    .child_class_next = ff_avio_child_class_next,
 };
 
 static void fill_buffer(AVIOContext *s);
@@ -76,27 +76,31 @@ int ffio_init_context(AVIOContext *s,
                   int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
                   int64_t (*seek)(void *opaque, int64_t offset, int whence))
 {
-    s->buffer = buffer;
+    s->buffer      = buffer;
     s->buffer_size = buffer_size;
-    s->buf_ptr = buffer;
-    s->opaque = opaque;
+    s->buf_ptr     = buffer;
+    s->opaque      = opaque;
+
     url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
-    s->write_packet = write_packet;
-    s->read_packet = read_packet;
-    s->seek = seek;
-    s->pos = 0;
-    s->must_flush = 0;
-    s->eof_reached = 0;
-    s->error = 0;
-    s->seekable = AVIO_SEEKABLE_NORMAL;
+
+    s->write_packet    = write_packet;
+    s->read_packet     = read_packet;
+    s->seek            = seek;
+    s->pos             = 0;
+    s->must_flush      = 0;
+    s->eof_reached     = 0;
+    s->error           = 0;
+    s->seekable        = seek ? AVIO_SEEKABLE_NORMAL : 0;
     s->max_packet_size = 0;
-    s->update_checksum= NULL;
-    if(!read_packet && !write_flag){
-        s->pos = buffer_size;
+    s->update_checksum = NULL;
+
+    if (!read_packet && !write_flag) {
+        s->pos     = buffer_size;
         s->buf_end = s->buffer + buffer_size;
     }
     s->read_pause = NULL;
     s->read_seek  = NULL;
+
     return 0;
 }
 
@@ -120,15 +124,17 @@ AVIOContext *avio_alloc_context(
 static void flush_buffer(AVIOContext *s)
 {
     if (s->buf_ptr > s->buffer) {
-        if (s->write_packet && !s->error){
-            int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
-            if(ret < 0){
+        if (s->write_packet && !s->error) {
+            int ret = s->write_packet(s->opaque, s->buffer,
+                                      s->buf_ptr - s->buffer);
+            if (ret < 0) {
                 s->error = ret;
             }
         }
-        if(s->update_checksum){
-            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
-            s->checksum_ptr= s->buffer;
+        if (s->update_checksum) {
+            s->checksum     = s->update_checksum(s->checksum, s->checksum_ptr,
+                                                 s->buf_ptr - s->checksum_ptr);
+            s->checksum_ptr = s->buffer;
         }
         s->pos += s->buf_ptr - s->buffer;
     }
@@ -200,7 +206,7 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
     }
     offset1 = offset - pos;
     if (!s->must_flush &&
-        offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
+        offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
         /* can do the seek inside the buffer */
         s->buf_ptr = s->buffer + offset1;
     } else if ((!s->seekable ||
@@ -215,12 +221,10 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
     } else {
         int64_t res;
 
-#if CONFIG_MUXERS || CONFIG_NETWORK
         if (s->write_flag) {
             flush_buffer(s);
             s->must_flush = 1;
         }
-#endif /* CONFIG_MUXERS || CONFIG_NETWORK */
         if (!s->seek)
             return AVERROR(EPIPE);
         if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
@@ -238,13 +242,13 @@ int64_t avio_size(AVIOContext *s)
 {
     int64_t size;
 
-    if(!s)
+    if (!s)
         return AVERROR(EINVAL);
 
     if (!s->seek)
         return AVERROR(ENOSYS);
     size = s->seek(s->opaque, 0, AVSEEK_SIZE);
-    if(size<0){
+    if (size < 0) {
         if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
             return size;
         size++;
@@ -290,29 +294,31 @@ int avio_put_str16le(AVIOContext *s, const char *str)
         uint16_t tmp;
 
         GET_UTF8(ch, *q++, break;)
-        PUT_UTF16(ch, tmp, avio_wl16(s, tmp);ret += 2;)
+        PUT_UTF16(ch, tmp, avio_wl16(s, tmp); ret += 2;)
     }
     avio_wl16(s, 0);
     ret += 2;
     return ret;
 }
 
-int ff_get_v_length(uint64_t val){
-    int i=1;
+int ff_get_v_length(uint64_t val)
+{
+    int i = 1;
 
-    while(val>>=7)
+    while (val >>= 7)
         i++;
 
     return i;
 }
 
-void ff_put_v(AVIOContext *bc, uint64_t val){
-    int i= ff_get_v_length(val);
+void ff_put_v(AVIOContext *bc, uint64_t val)
+{
+    int i = ff_get_v_length(val);
 
-    while(--i>0)
-        avio_w8(bc, 128 | (val>>(7*i)));
+    while (--i > 0)
+        avio_w8(bc, 128 | (val >> (7 * i)));
 
-    avio_w8(bc, val&127);
+    avio_w8(bc, val & 127);
 }
 
 void avio_wl64(AVIOContext *s, uint64_t val)
@@ -355,11 +361,14 @@ void avio_wb24(AVIOContext *s, unsigned int val)
 
 static void fill_buffer(AVIOContext *s)
 {
-    uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_end : s->buffer;
-    int len= s->buffer_size - (dst - s->buffer);
-    int max_buffer_size = s->max_packet_size ? s->max_packet_size : IO_BUFFER_SIZE;
-
-    /* can't fill the buffer without read_packet, just set EOF if appropiate */
+    uint8_t *dst        = !s->max_packet_size &&
+                          s->buf_end - s->buffer < s->buffer_size ?
+                          s->buf_end : s->buffer;
+    int len             = s->buffer_size - (dst - s->buffer);
+    int max_buffer_size = s->max_packet_size ?
+                          s->max_packet_size : IO_BUFFER_SIZE;
+
+    /* can't fill the buffer without read_packet, just set EOF if appropriate */
     if (!s->read_packet && s->buf_ptr >= s->buf_end)
         s->eof_reached = 1;
 
@@ -367,10 +376,11 @@ static void fill_buffer(AVIOContext *s)
     if (s->eof_reached)
         return;
 
-    if(s->update_checksum && dst == s->buffer){
-        if(s->buf_end > s->checksum_ptr)
-            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
-        s->checksum_ptr= s->buffer;
+    if (s->update_checksum && dst == s->buffer) {
+        if (s->buf_end > s->checksum_ptr)
+            s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
+                                             s->buf_end - s->checksum_ptr);
+        s->checksum_ptr = s->buffer;
     }
 
     /* make buffer smaller in case it ended up large after probing */
@@ -381,7 +391,7 @@ static void fill_buffer(AVIOContext *s)
         len = s->buffer_size;
     }
 
-    if(s->read_packet)
+    if (s->read_packet)
         len = s->read_packet(s->opaque, dst, len);
     else
         len = 0;
@@ -389,8 +399,8 @@ static void fill_buffer(AVIOContext *s)
         /* do not modify buffer if EOF reached so that a seek back can
            be done without rereading data */
         s->eof_reached = 1;
-        if(len<0)
-            s->error= len;
+        if (len < 0)
+            s->error = len;
     } else {
         s->pos += len;
         s->buf_ptr = dst;
@@ -404,10 +414,17 @@ unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
     return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
 }
 
+unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
+                                unsigned int len)
+{
+    return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
+}
+
 unsigned long ffio_get_checksum(AVIOContext *s)
 {
-    s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
-    s->update_checksum= NULL;
+    s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
+                                     s->buf_ptr - s->checksum_ptr);
+    s->update_checksum = NULL;
     return s->checksum;
 }
 
@@ -415,10 +432,10 @@ void ffio_init_checksum(AVIOContext *s,
                    unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
                    unsigned long checksum)
 {
-    s->update_checksum= update_checksum;
-    if(s->update_checksum){
-        s->checksum= checksum;
-        s->checksum_ptr= s->buf_ptr;
+    s->update_checksum = update_checksum;
+    if (s->update_checksum) {
+        s->checksum     = checksum;
+        s->checksum_ptr = s->buf_ptr;
     }
 }
 
@@ -441,7 +458,7 @@ int avio_read(AVIOContext *s, unsigned char *buf, int size)
         len = s->buf_end - s->buf_ptr;
         if (len > size)
             len = size;
-        if (len == 0) {
+        if (len == 0 || s->write_flag) {
             if(size > s->buffer_size && !s->update_checksum){
                 if(s->read_packet)
                     len = s->read_packet(s->opaque, buf, size);
@@ -459,7 +476,7 @@ int avio_read(AVIOContext *s, unsigned char *buf, int size)
                     s->buf_ptr = s->buffer;
                     s->buf_end = s->buffer/* + len*/;
                 }
-            }else{
+            } else {
                 fill_buffer(s);
                 len = s->buf_end - s->buf_ptr;
                 if (len == 0)
@@ -479,15 +496,41 @@ int avio_read(AVIOContext *s, unsigned char *buf, int size)
     return size1 - size;
 }
 
+int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
+{
+    if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
+        *data = s->buf_ptr;
+        s->buf_ptr += size;
+        return size;
+    } else {
+        *data = buf;
+        return avio_read(s, buf, size);
+    }
+}
+
 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
 {
     int len;
 
-    if(size<0)
+    if (size < 0)
         return -1;
 
+    if (s->read_packet && s->write_flag) {
+        len = s->read_packet(s->opaque, buf, size);
+        if (len > 0)
+            s->pos += len;
+        return len;
+    }
+
     len = s->buf_end - s->buf_ptr;
     if (len == 0) {
+        /* Reset the buf_end pointer to the start of the buffer, to make sure
+         * the fill_buffer call tries to read as much data as fits into the
+         * full buffer, instead of just what space is left after buf_end.
+         * This avoids returning partial packets at the end of the buffer,
+         * for packet based inputs.
+         */
+        s->buf_end = s->buf_ptr = s->buffer;
         fill_buffer(s);
         len = s->buf_end - s->buf_ptr;
     }
@@ -660,7 +703,7 @@ int ffio_fdopen(AVIOContext **s, URLContext *h)
         (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
         (*s)->read_seek  = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
     }
-    (*s)->av_class = &ffio_url_class;
+    (*s)->av_class = &ff_avio_class;
     return 0;
 }
 
@@ -803,7 +846,7 @@ int64_t avio_seek_time(AVIOContext *s, int stream_index,
     if (!s->read_seek)
         return AVERROR(ENOSYS);
     ret = s->read_seek(h, stream_index, timestamp, flags);
-    if(ret >= 0) {
+    if (ret >= 0) {
         int64_t pos;
         s->buf_ptr = s->buf_end; // Flush buffer
         pos = s->seek(h, 0, SEEK_CUR);
@@ -832,7 +875,7 @@ static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
     /* reallocate buffer if needed */
     new_size = d->pos + buf_size;
     new_allocated_size = d->allocated_size;
-    if(new_size < d->pos || new_size > INT_MAX/2)
+    if (new_size < d->pos || new_size > INT_MAX/2)
         return -1;
     while (new_size > new_allocated_size) {
         if (!new_allocated_size)
@@ -842,9 +885,12 @@ static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
     }
 
     if (new_allocated_size > d->allocated_size) {
-        d->buffer = av_realloc(d->buffer, new_allocated_size);
-        if(d->buffer == NULL)
-             return AVERROR(ENOMEM);
+        int err;
+        if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
+            d->allocated_size = 0;
+            d->size = 0;
+            return err;
+        }
         d->allocated_size = new_allocated_size;
     }
     memcpy(d->buffer + d->pos, buf, buf_size);
@@ -861,8 +907,8 @@ static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
 
     /* packetized write: output the header */
     AV_WB32(buf1, buf_size);
-    ret= dyn_buf_write(opaque, buf1, 4);
-    if(ret < 0)
+    ret = dyn_buf_write(opaque, buf1, 4);
+    if (ret < 0)
         return ret;
 
     /* then the data */
@@ -888,7 +934,7 @@ static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
     DynBuffer *d;
     unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
 
-    if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
+    if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
         return -1;
     d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
     if (!d)
@@ -919,11 +965,16 @@ int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
 
 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
 {
-    DynBuffer *d = s->opaque;
+    DynBuffer *d;
     int size;
     static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0};
     int padding = 0;
 
+    if (!s) {
+        *pbuffer = NULL;
+        return 0;
+    }
+
     /* don't attempt to pad fixed-size packet buffers */
     if (!s->max_packet_size) {
         avio_write(s, padbuf, sizeof(padbuf));
@@ -932,9 +983,53 @@ int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
 
     avio_flush(s);
 
+    d = s->opaque;
     *pbuffer = d->buffer;
     size = d->size;
     av_free(d);
     av_free(s);
     return size - padding;
 }
+
+void ffio_free_dyn_buf(AVIOContext **s)
+{
+    uint8_t *tmp;
+    if (!*s)
+        return;
+    avio_close_dyn_buf(*s, &tmp);
+    av_free(tmp);
+    *s = NULL;
+}
+
+static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
+{
+    DynBuffer *d = opaque;
+
+    d->pos += buf_size;
+    if (d->pos > d->size)
+        d->size = d->pos;
+    return buf_size;
+}
+
+int ffio_open_null_buf(AVIOContext **s)
+{
+    int ret = url_open_dyn_buf_internal(s, 0);
+    if (ret >= 0) {
+        AVIOContext *pb = *s;
+        pb->write_packet = null_buf_write;
+    }
+    return ret;
+}
+
+int ffio_close_null_buf(AVIOContext *s)
+{
+    DynBuffer *d = s->opaque;
+    int size;
+
+    avio_flush(s);
+
+    size = d->size;
+    av_free(d);
+    av_free(s);
+    return size;
+}