yading@11: /*
yading@11:  * buffered I/O
yading@11:  * Copyright (c) 2000,2001 Fabrice Bellard
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/crc.h"
yading@11: #include "libavutil/dict.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/log.h"
yading@11: #include "libavutil/opt.h"
yading@11: #include "libavutil/avassert.h"
yading@11: #include "avformat.h"
yading@11: #include "avio.h"
yading@11: #include "avio_internal.h"
yading@11: #include "internal.h"
yading@11: #include "url.h"
yading@11: #include <stdarg.h>
yading@11: 
yading@11: #define IO_BUFFER_SIZE 32768
yading@11: 
yading@11: /**
yading@11:  * Do seeks within this distance ahead of the current buffer by skipping
yading@11:  * data instead of calling the protocol seek function, for seekable
yading@11:  * protocols.
yading@11:  */
yading@11: #define SHORT_SEEK_THRESHOLD 4096
yading@11: 
yading@11: static void *ffio_url_child_next(void *obj, void *prev)
yading@11: {
yading@11:     AVIOContext *s = obj;
yading@11:     return prev ? NULL : s->opaque;
yading@11: }
yading@11: 
yading@11: static const AVClass *ffio_url_child_class_next(const AVClass *prev)
yading@11: {
yading@11:     return prev ? NULL : &ffurl_context_class;
yading@11: }
yading@11: 
yading@11: static const AVOption ffio_url_options[] = {
yading@11:     { NULL },
yading@11: };
yading@11: 
yading@11: const AVClass ffio_url_class = {
yading@11:     .class_name = "AVIOContext",
yading@11:     .item_name  = av_default_item_name,
yading@11:     .version    = LIBAVUTIL_VERSION_INT,
yading@11:     .option     = ffio_url_options,
yading@11:     .child_next = ffio_url_child_next,
yading@11:     .child_class_next = ffio_url_child_class_next,
yading@11: };
yading@11: 
yading@11: static void fill_buffer(AVIOContext *s);
yading@11: static int url_resetbuf(AVIOContext *s, int flags);
yading@11: 
yading@11: int ffio_init_context(AVIOContext *s,
yading@11:                   unsigned char *buffer,
yading@11:                   int buffer_size,
yading@11:                   int write_flag,
yading@11:                   void *opaque,
yading@11:                   int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
yading@11:                   int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
yading@11:                   int64_t (*seek)(void *opaque, int64_t offset, int whence))
yading@11: {
yading@11:     s->buffer      = buffer;
yading@11:     s->buffer_size = buffer_size;
yading@11:     s->buf_ptr     = buffer;
yading@11:     s->opaque      = opaque;
yading@11:     s->direct      = 0;
yading@11: 
yading@11:     url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
yading@11: 
yading@11:     s->write_packet    = write_packet;
yading@11:     s->read_packet     = read_packet;
yading@11:     s->seek            = seek;
yading@11:     s->pos             = 0;
yading@11:     s->must_flush      = 0;
yading@11:     s->eof_reached     = 0;
yading@11:     s->error           = 0;
yading@11:     s->seekable        = AVIO_SEEKABLE_NORMAL;
yading@11:     s->max_packet_size = 0;
yading@11:     s->update_checksum = NULL;
yading@11: 
yading@11:     if (!read_packet && !write_flag) {
yading@11:         s->pos     = buffer_size;
yading@11:         s->buf_end = s->buffer + buffer_size;
yading@11:     }
yading@11:     s->read_pause = NULL;
yading@11:     s->read_seek  = NULL;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVIOContext *avio_alloc_context(
yading@11:                   unsigned char *buffer,
yading@11:                   int buffer_size,
yading@11:                   int write_flag,
yading@11:                   void *opaque,
yading@11:                   int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
yading@11:                   int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
yading@11:                   int64_t (*seek)(void *opaque, int64_t offset, int whence))
yading@11: {
yading@11:     AVIOContext *s = av_mallocz(sizeof(AVIOContext));
yading@11:     if (!s)
yading@11:         return NULL;
yading@11:     ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
yading@11:                   read_packet, write_packet, seek);
yading@11:     return s;
yading@11: }
yading@11: 
yading@11: static void writeout(AVIOContext *s, const uint8_t *data, int len)
yading@11: {
yading@11:     if (s->write_packet && !s->error) {
yading@11:         int ret = s->write_packet(s->opaque, (uint8_t *)data, len);
yading@11:         if (ret < 0) {
yading@11:             s->error = ret;
yading@11:         }
yading@11:     }
yading@11:     s->writeout_count ++;
yading@11:     s->pos += len;
yading@11: }
yading@11: 
yading@11: static void flush_buffer(AVIOContext *s)
yading@11: {
yading@11:     if (s->buf_ptr > s->buffer) {
yading@11:         writeout(s, s->buffer, s->buf_ptr - s->buffer);
yading@11:         if (s->update_checksum) {
yading@11:             s->checksum     = s->update_checksum(s->checksum, s->checksum_ptr,
yading@11:                                                  s->buf_ptr - s->checksum_ptr);
yading@11:             s->checksum_ptr = s->buffer;
yading@11:         }
yading@11:     }
yading@11:     s->buf_ptr = s->buffer;
yading@11: }
yading@11: 
yading@11: void avio_w8(AVIOContext *s, int b)
yading@11: {
yading@11:     av_assert2(b>=-128 && b<=255);
yading@11:     *s->buf_ptr++ = b;
yading@11:     if (s->buf_ptr >= s->buf_end)
yading@11:         flush_buffer(s);
yading@11: }
yading@11: 
yading@11: void ffio_fill(AVIOContext *s, int b, int count)
yading@11: {
yading@11:     while (count > 0) {
yading@11:         int len = FFMIN(s->buf_end - s->buf_ptr, count);
yading@11:         memset(s->buf_ptr, b, len);
yading@11:         s->buf_ptr += len;
yading@11: 
yading@11:         if (s->buf_ptr >= s->buf_end)
yading@11:             flush_buffer(s);
yading@11: 
yading@11:         count -= len;
yading@11:     }
yading@11: }
yading@11: 
yading@11: void avio_write(AVIOContext *s, const unsigned char *buf, int size)
yading@11: {
yading@11:     if (s->direct && !s->update_checksum) {
yading@11:         avio_flush(s);
yading@11:         writeout(s, buf, size);
yading@11:         return;
yading@11:     }
yading@11:     while (size > 0) {
yading@11:         int len = FFMIN(s->buf_end - s->buf_ptr, size);
yading@11:         memcpy(s->buf_ptr, buf, len);
yading@11:         s->buf_ptr += len;
yading@11: 
yading@11:         if (s->buf_ptr >= s->buf_end)
yading@11:             flush_buffer(s);
yading@11: 
yading@11:         buf += len;
yading@11:         size -= len;
yading@11:     }
yading@11: }
yading@11: 
yading@11: void avio_flush(AVIOContext *s)
yading@11: {
yading@11:     flush_buffer(s);
yading@11:     s->must_flush = 0;
yading@11: }
yading@11: 
yading@11: int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
yading@11: {
yading@11:     int64_t offset1;
yading@11:     int64_t pos;
yading@11:     int force = whence & AVSEEK_FORCE;
yading@11:     whence &= ~AVSEEK_FORCE;
yading@11: 
yading@11:     if(!s)
yading@11:         return AVERROR(EINVAL);
yading@11: 
yading@11:     pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
yading@11: 
yading@11:     if (whence != SEEK_CUR && whence != SEEK_SET)
yading@11:         return AVERROR(EINVAL);
yading@11: 
yading@11:     if (whence == SEEK_CUR) {
yading@11:         offset1 = pos + (s->buf_ptr - s->buffer);
yading@11:         if (offset == 0)
yading@11:             return offset1;
yading@11:         offset += offset1;
yading@11:     }
yading@11:     offset1 = offset - pos;
yading@11:     if (!s->must_flush && (!s->direct || !s->seek) &&
yading@11:         offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
yading@11:         /* can do the seek inside the buffer */
yading@11:         s->buf_ptr = s->buffer + offset1;
yading@11:     } else if ((!s->seekable ||
yading@11:                offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) &&
yading@11:                !s->write_flag && offset1 >= 0 &&
yading@11:                (!s->direct || !s->seek) &&
yading@11:               (whence != SEEK_END || force)) {
yading@11:         while(s->pos < offset && !s->eof_reached)
yading@11:             fill_buffer(s);
yading@11:         if (s->eof_reached)
yading@11:             return AVERROR_EOF;
yading@11:         s->buf_ptr = s->buf_end + offset - s->pos;
yading@11:     } else {
yading@11:         int64_t res;
yading@11: 
yading@11:         if (s->write_flag) {
yading@11:             flush_buffer(s);
yading@11:             s->must_flush = 1;
yading@11:         }
yading@11:         if (!s->seek)
yading@11:             return AVERROR(EPIPE);
yading@11:         if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
yading@11:             return res;
yading@11:         s->seek_count ++;
yading@11:         if (!s->write_flag)
yading@11:             s->buf_end = s->buffer;
yading@11:         s->buf_ptr = s->buffer;
yading@11:         s->pos = offset;
yading@11:     }
yading@11:     s->eof_reached = 0;
yading@11:     return offset;
yading@11: }
yading@11: 
yading@11: int64_t avio_skip(AVIOContext *s, int64_t offset)
yading@11: {
yading@11:     return avio_seek(s, offset, SEEK_CUR);
yading@11: }
yading@11: 
yading@11: int64_t avio_size(AVIOContext *s)
yading@11: {
yading@11:     int64_t size;
yading@11: 
yading@11:     if (!s)
yading@11:         return AVERROR(EINVAL);
yading@11: 
yading@11:     if (!s->seek)
yading@11:         return AVERROR(ENOSYS);
yading@11:     size = s->seek(s->opaque, 0, AVSEEK_SIZE);
yading@11:     if (size < 0) {
yading@11:         if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
yading@11:             return size;
yading@11:         size++;
yading@11:         s->seek(s->opaque, s->pos, SEEK_SET);
yading@11:     }
yading@11:     return size;
yading@11: }
yading@11: 
yading@11: int url_feof(AVIOContext *s)
yading@11: {
yading@11:     if(!s)
yading@11:         return 0;
yading@11:     if(s->eof_reached){
yading@11:         s->eof_reached=0;
yading@11:         fill_buffer(s);
yading@11:     }
yading@11:     return s->eof_reached;
yading@11: }
yading@11: 
yading@11: void avio_wl32(AVIOContext *s, unsigned int val)
yading@11: {
yading@11:     avio_w8(s, (uint8_t) val       );
yading@11:     avio_w8(s, (uint8_t)(val >> 8 ));
yading@11:     avio_w8(s, (uint8_t)(val >> 16));
yading@11:     avio_w8(s,           val >> 24 );
yading@11: }
yading@11: 
yading@11: void avio_wb32(AVIOContext *s, unsigned int val)
yading@11: {
yading@11:     avio_w8(s,           val >> 24 );
yading@11:     avio_w8(s, (uint8_t)(val >> 16));
yading@11:     avio_w8(s, (uint8_t)(val >> 8 ));
yading@11:     avio_w8(s, (uint8_t) val       );
yading@11: }
yading@11: 
yading@11: int avio_put_str(AVIOContext *s, const char *str)
yading@11: {
yading@11:     int len = 1;
yading@11:     if (str) {
yading@11:         len += strlen(str);
yading@11:         avio_write(s, (const unsigned char *) str, len);
yading@11:     } else
yading@11:         avio_w8(s, 0);
yading@11:     return len;
yading@11: }
yading@11: 
yading@11: int avio_put_str16le(AVIOContext *s, const char *str)
yading@11: {
yading@11:     const uint8_t *q = str;
yading@11:     int ret = 0;
yading@11: 
yading@11:     while (*q) {
yading@11:         uint32_t ch;
yading@11:         uint16_t tmp;
yading@11: 
yading@11:         GET_UTF8(ch, *q++, break;)
yading@11:         PUT_UTF16(ch, tmp, avio_wl16(s, tmp); ret += 2;)
yading@11:     }
yading@11:     avio_wl16(s, 0);
yading@11:     ret += 2;
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: int ff_get_v_length(uint64_t val)
yading@11: {
yading@11:     int i = 1;
yading@11: 
yading@11:     while (val >>= 7)
yading@11:         i++;
yading@11: 
yading@11:     return i;
yading@11: }
yading@11: 
yading@11: void ff_put_v(AVIOContext *bc, uint64_t val)
yading@11: {
yading@11:     int i = ff_get_v_length(val);
yading@11: 
yading@11:     while (--i > 0)
yading@11:         avio_w8(bc, 128 | (uint8_t)(val >> (7*i)));
yading@11: 
yading@11:     avio_w8(bc, val & 127);
yading@11: }
yading@11: 
yading@11: void avio_wl64(AVIOContext *s, uint64_t val)
yading@11: {
yading@11:     avio_wl32(s, (uint32_t)(val & 0xffffffff));
yading@11:     avio_wl32(s, (uint32_t)(val >> 32));
yading@11: }
yading@11: 
yading@11: void avio_wb64(AVIOContext *s, uint64_t val)
yading@11: {
yading@11:     avio_wb32(s, (uint32_t)(val >> 32));
yading@11:     avio_wb32(s, (uint32_t)(val & 0xffffffff));
yading@11: }
yading@11: 
yading@11: void avio_wl16(AVIOContext *s, unsigned int val)
yading@11: {
yading@11:     avio_w8(s, (uint8_t)val);
yading@11:     avio_w8(s, (int)val >> 8);
yading@11: }
yading@11: 
yading@11: void avio_wb16(AVIOContext *s, unsigned int val)
yading@11: {
yading@11:     avio_w8(s, (int)val >> 8);
yading@11:     avio_w8(s, (uint8_t)val);
yading@11: }
yading@11: 
yading@11: void avio_wl24(AVIOContext *s, unsigned int val)
yading@11: {
yading@11:     avio_wl16(s, val & 0xffff);
yading@11:     avio_w8(s, (int)val >> 16);
yading@11: }
yading@11: 
yading@11: void avio_wb24(AVIOContext *s, unsigned int val)
yading@11: {
yading@11:     avio_wb16(s, (int)val >> 8);
yading@11:     avio_w8(s, (uint8_t)val);
yading@11: }
yading@11: 
yading@11: /* Input stream */
yading@11: 
yading@11: static void fill_buffer(AVIOContext *s)
yading@11: {
yading@11:     uint8_t *dst        = !s->max_packet_size &&
yading@11:                           s->buf_end - s->buffer < s->buffer_size ?
yading@11:                           s->buf_end : s->buffer;
yading@11:     int len             = s->buffer_size - (dst - s->buffer);
yading@11:     int max_buffer_size = s->max_packet_size ?
yading@11:                           s->max_packet_size : IO_BUFFER_SIZE;
yading@11: 
yading@11:     /* can't fill the buffer without read_packet, just set EOF if appropriate */
yading@11:     if (!s->read_packet && s->buf_ptr >= s->buf_end)
yading@11:         s->eof_reached = 1;
yading@11: 
yading@11:     /* no need to do anything if EOF already reached */
yading@11:     if (s->eof_reached)
yading@11:         return;
yading@11: 
yading@11:     if (s->update_checksum && dst == s->buffer) {
yading@11:         if (s->buf_end > s->checksum_ptr)
yading@11:             s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
yading@11:                                              s->buf_end - s->checksum_ptr);
yading@11:         s->checksum_ptr = s->buffer;
yading@11:     }
yading@11: 
yading@11:     /* make buffer smaller in case it ended up large after probing */
yading@11:     if (s->read_packet && s->buffer_size > max_buffer_size) {
yading@11:         ffio_set_buf_size(s, max_buffer_size);
yading@11: 
yading@11:         s->checksum_ptr = dst = s->buffer;
yading@11:         len = s->buffer_size;
yading@11:     }
yading@11: 
yading@11:     if (s->read_packet)
yading@11:         len = s->read_packet(s->opaque, dst, len);
yading@11:     else
yading@11:         len = 0;
yading@11:     if (len <= 0) {
yading@11:         /* do not modify buffer if EOF reached so that a seek back can
yading@11:            be done without rereading data */
yading@11:         s->eof_reached = 1;
yading@11:         if (len < 0)
yading@11:             s->error = len;
yading@11:     } else {
yading@11:         s->pos += len;
yading@11:         s->buf_ptr = dst;
yading@11:         s->buf_end = dst + len;
yading@11:         s->bytes_read += len;
yading@11:     }
yading@11: }
yading@11: 
yading@11: unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
yading@11:                                     unsigned int len)
yading@11: {
yading@11:     return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
yading@11: }
yading@11: 
yading@11: unsigned long ffio_get_checksum(AVIOContext *s)
yading@11: {
yading@11:     s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
yading@11:                                      s->buf_ptr - s->checksum_ptr);
yading@11:     s->update_checksum = NULL;
yading@11:     return s->checksum;
yading@11: }
yading@11: 
yading@11: void ffio_init_checksum(AVIOContext *s,
yading@11:                    unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
yading@11:                    unsigned long checksum)
yading@11: {
yading@11:     s->update_checksum = update_checksum;
yading@11:     if (s->update_checksum) {
yading@11:         s->checksum     = checksum;
yading@11:         s->checksum_ptr = s->buf_ptr;
yading@11:     }
yading@11: }
yading@11: 
yading@11: /* XXX: put an inline version */
yading@11: int avio_r8(AVIOContext *s)
yading@11: {
yading@11:     if (s->buf_ptr >= s->buf_end)
yading@11:         fill_buffer(s);
yading@11:     if (s->buf_ptr < s->buf_end)
yading@11:         return *s->buf_ptr++;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: int avio_read(AVIOContext *s, unsigned char *buf, int size)
yading@11: {
yading@11:     int len, size1;
yading@11: 
yading@11:     size1 = size;
yading@11:     while (size > 0) {
yading@11:         len = s->buf_end - s->buf_ptr;
yading@11:         if (len > size)
yading@11:             len = size;
yading@11:         if (len == 0 || s->write_flag) {
yading@11:             if((s->direct || size > s->buffer_size) && !s->update_checksum){
yading@11:                 if(s->read_packet)
yading@11:                     len = s->read_packet(s->opaque, buf, size);
yading@11:                 if (len <= 0) {
yading@11:                     /* do not modify buffer if EOF reached so that a seek back can
yading@11:                     be done without rereading data */
yading@11:                     s->eof_reached = 1;
yading@11:                     if(len<0)
yading@11:                         s->error= len;
yading@11:                     break;
yading@11:                 } else {
yading@11:                     s->pos += len;
yading@11:                     s->bytes_read += len;
yading@11:                     size -= len;
yading@11:                     buf += len;
yading@11:                     s->buf_ptr = s->buffer;
yading@11:                     s->buf_end = s->buffer/* + len*/;
yading@11:                 }
yading@11:             } else {
yading@11:                 fill_buffer(s);
yading@11:                 len = s->buf_end - s->buf_ptr;
yading@11:                 if (len == 0)
yading@11:                     break;
yading@11:             }
yading@11:         } else {
yading@11:             memcpy(buf, s->buf_ptr, len);
yading@11:             buf += len;
yading@11:             s->buf_ptr += len;
yading@11:             size -= len;
yading@11:         }
yading@11:     }
yading@11:     if (size1 == size) {
yading@11:         if (s->error)      return s->error;
yading@11:         if (url_feof(s))   return AVERROR_EOF;
yading@11:     }
yading@11:     return size1 - size;
yading@11: }
yading@11: 
yading@11: int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
yading@11: {
yading@11:     int len;
yading@11: 
yading@11:     if (size < 0)
yading@11:         return -1;
yading@11: 
yading@11:     if (s->read_packet && s->write_flag) {
yading@11:         len = s->read_packet(s->opaque, buf, size);
yading@11:         if (len > 0)
yading@11:             s->pos += len;
yading@11:         return len;
yading@11:     }
yading@11: 
yading@11:     len = s->buf_end - s->buf_ptr;
yading@11:     if (len == 0) {
yading@11:         /* Reset the buf_end pointer to the start of the buffer, to make sure
yading@11:          * the fill_buffer call tries to read as much data as fits into the
yading@11:          * full buffer, instead of just what space is left after buf_end.
yading@11:          * This avoids returning partial packets at the end of the buffer,
yading@11:          * for packet based inputs.
yading@11:          */
yading@11:         s->buf_end = s->buf_ptr = s->buffer;
yading@11:         fill_buffer(s);
yading@11:         len = s->buf_end - s->buf_ptr;
yading@11:     }
yading@11:     if (len > size)
yading@11:         len = size;
yading@11:     memcpy(buf, s->buf_ptr, len);
yading@11:     s->buf_ptr += len;
yading@11:     if (!len) {
yading@11:         if (s->error)      return s->error;
yading@11:         if (url_feof(s))   return AVERROR_EOF;
yading@11:     }
yading@11:     return len;
yading@11: }
yading@11: 
yading@11: unsigned int avio_rl16(AVIOContext *s)
yading@11: {
yading@11:     unsigned int val;
yading@11:     val = avio_r8(s);
yading@11:     val |= avio_r8(s) << 8;
yading@11:     return val;
yading@11: }
yading@11: 
yading@11: unsigned int avio_rl24(AVIOContext *s)
yading@11: {
yading@11:     unsigned int val;
yading@11:     val = avio_rl16(s);
yading@11:     val |= avio_r8(s) << 16;
yading@11:     return val;
yading@11: }
yading@11: 
yading@11: unsigned int avio_rl32(AVIOContext *s)
yading@11: {
yading@11:     unsigned int val;
yading@11:     val = avio_rl16(s);
yading@11:     val |= avio_rl16(s) << 16;
yading@11:     return val;
yading@11: }
yading@11: 
yading@11: uint64_t avio_rl64(AVIOContext *s)
yading@11: {
yading@11:     uint64_t val;
yading@11:     val = (uint64_t)avio_rl32(s);
yading@11:     val |= (uint64_t)avio_rl32(s) << 32;
yading@11:     return val;
yading@11: }
yading@11: 
yading@11: unsigned int avio_rb16(AVIOContext *s)
yading@11: {
yading@11:     unsigned int val;
yading@11:     val = avio_r8(s) << 8;
yading@11:     val |= avio_r8(s);
yading@11:     return val;
yading@11: }
yading@11: 
yading@11: unsigned int avio_rb24(AVIOContext *s)
yading@11: {
yading@11:     unsigned int val;
yading@11:     val = avio_rb16(s) << 8;
yading@11:     val |= avio_r8(s);
yading@11:     return val;
yading@11: }
yading@11: unsigned int avio_rb32(AVIOContext *s)
yading@11: {
yading@11:     unsigned int val;
yading@11:     val = avio_rb16(s) << 16;
yading@11:     val |= avio_rb16(s);
yading@11:     return val;
yading@11: }
yading@11: 
yading@11: int ff_get_line(AVIOContext *s, char *buf, int maxlen)
yading@11: {
yading@11:     int i = 0;
yading@11:     char c;
yading@11: 
yading@11:     do {
yading@11:         c = avio_r8(s);
yading@11:         if (c && i < maxlen-1)
yading@11:             buf[i++] = c;
yading@11:     } while (c != '\n' && c);
yading@11: 
yading@11:     buf[i] = 0;
yading@11:     return i;
yading@11: }
yading@11: 
yading@11: int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
yading@11: {
yading@11:     int i;
yading@11: 
yading@11:     if (buflen <= 0)
yading@11:         return AVERROR(EINVAL);
yading@11:     // reserve 1 byte for terminating 0
yading@11:     buflen = FFMIN(buflen - 1, maxlen);
yading@11:     for (i = 0; i < buflen; i++)
yading@11:         if (!(buf[i] = avio_r8(s)))
yading@11:             return i + 1;
yading@11:     buf[i] = 0;
yading@11:     for (; i < maxlen; i++)
yading@11:         if (!avio_r8(s))
yading@11:             return i + 1;
yading@11:     return maxlen;
yading@11: }
yading@11: 
yading@11: #define GET_STR16(type, read) \
yading@11:     int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
yading@11: {\
yading@11:     char* q = buf;\
yading@11:     int ret = 0;\
yading@11:     if (buflen <= 0) \
yading@11:         return AVERROR(EINVAL); \
yading@11:     while (ret + 1 < maxlen) {\
yading@11:         uint8_t tmp;\
yading@11:         uint32_t ch;\
yading@11:         GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
yading@11:         if (!ch)\
yading@11:             break;\
yading@11:         PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
yading@11:     }\
yading@11:     *q = 0;\
yading@11:     return ret;\
yading@11: }\
yading@11: 
yading@11: GET_STR16(le, avio_rl16)
yading@11: GET_STR16(be, avio_rb16)
yading@11: 
yading@11: #undef GET_STR16
yading@11: 
yading@11: uint64_t avio_rb64(AVIOContext *s)
yading@11: {
yading@11:     uint64_t val;
yading@11:     val = (uint64_t)avio_rb32(s) << 32;
yading@11:     val |= (uint64_t)avio_rb32(s);
yading@11:     return val;
yading@11: }
yading@11: 
yading@11: uint64_t ffio_read_varlen(AVIOContext *bc){
yading@11:     uint64_t val = 0;
yading@11:     int tmp;
yading@11: 
yading@11:     do{
yading@11:         tmp = avio_r8(bc);
yading@11:         val= (val<<7) + (tmp&127);
yading@11:     }while(tmp&128);
yading@11:     return val;
yading@11: }
yading@11: 
yading@11: int ffio_fdopen(AVIOContext **s, URLContext *h)
yading@11: {
yading@11:     uint8_t *buffer;
yading@11:     int buffer_size, max_packet_size;
yading@11: 
yading@11:     max_packet_size = h->max_packet_size;
yading@11:     if (max_packet_size) {
yading@11:         buffer_size = max_packet_size; /* no need to bufferize more than one packet */
yading@11:     } else {
yading@11:         buffer_size = IO_BUFFER_SIZE;
yading@11:     }
yading@11:     buffer = av_malloc(buffer_size);
yading@11:     if (!buffer)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE, h,
yading@11:                             (void*)ffurl_read, (void*)ffurl_write, (void*)ffurl_seek);
yading@11:     if (!*s) {
yading@11:         av_free(buffer);
yading@11:         return AVERROR(ENOMEM);
yading@11:     }
yading@11:     (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
yading@11:     (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
yading@11:     (*s)->max_packet_size = max_packet_size;
yading@11:     if(h->prot) {
yading@11:         (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
yading@11:         (*s)->read_seek  = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
yading@11:     }
yading@11:     (*s)->av_class = &ffio_url_class;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: int ffio_set_buf_size(AVIOContext *s, int buf_size)
yading@11: {
yading@11:     uint8_t *buffer;
yading@11:     buffer = av_malloc(buf_size);
yading@11:     if (!buffer)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     av_free(s->buffer);
yading@11:     s->buffer = buffer;
yading@11:     s->buffer_size = buf_size;
yading@11:     s->buf_ptr = buffer;
yading@11:     url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int url_resetbuf(AVIOContext *s, int flags)
yading@11: {
yading@11:     av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
yading@11: 
yading@11:     if (flags & AVIO_FLAG_WRITE) {
yading@11:         s->buf_end = s->buffer + s->buffer_size;
yading@11:         s->write_flag = 1;
yading@11:     } else {
yading@11:         s->buf_end = s->buffer;
yading@11:         s->write_flag = 0;
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
yading@11: {
yading@11:     int64_t buffer_start;
yading@11:     int buffer_size;
yading@11:     int overlap, new_size, alloc_size;
yading@11:     uint8_t *buf = *bufp;
yading@11: 
yading@11:     if (s->write_flag) {
yading@11:         av_freep(bufp);
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11: 
yading@11:     buffer_size = s->buf_end - s->buffer;
yading@11: 
yading@11:     /* the buffers must touch or overlap */
yading@11:     if ((buffer_start = s->pos - buffer_size) > buf_size) {
yading@11:         av_freep(bufp);
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11: 
yading@11:     overlap = buf_size - buffer_start;
yading@11:     new_size = buf_size + buffer_size - overlap;
yading@11: 
yading@11:     alloc_size = FFMAX(s->buffer_size, new_size);
yading@11:     if (alloc_size > buf_size)
yading@11:         if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
yading@11:             return AVERROR(ENOMEM);
yading@11: 
yading@11:     if (new_size > buf_size) {
yading@11:         memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
yading@11:         buf_size = new_size;
yading@11:     }
yading@11: 
yading@11:     av_free(s->buffer);
yading@11:     s->buf_ptr = s->buffer = buf;
yading@11:     s->buffer_size = alloc_size;
yading@11:     s->pos = buf_size;
yading@11:     s->buf_end = s->buf_ptr + buf_size;
yading@11:     s->eof_reached = 0;
yading@11:     s->must_flush = 0;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: int avio_open(AVIOContext **s, const char *filename, int flags)
yading@11: {
yading@11:     return avio_open2(s, filename, flags, NULL, NULL);
yading@11: }
yading@11: 
yading@11: int avio_open2(AVIOContext **s, const char *filename, int flags,
yading@11:                const AVIOInterruptCB *int_cb, AVDictionary **options)
yading@11: {
yading@11:     URLContext *h;
yading@11:     int err;
yading@11: 
yading@11:     err = ffurl_open(&h, filename, flags, int_cb, options);
yading@11:     if (err < 0)
yading@11:         return err;
yading@11:     err = ffio_fdopen(s, h);
yading@11:     if (err < 0) {
yading@11:         ffurl_close(h);
yading@11:         return err;
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: int avio_close(AVIOContext *s)
yading@11: {
yading@11:     URLContext *h;
yading@11: 
yading@11:     if (!s)
yading@11:         return 0;
yading@11: 
yading@11:     avio_flush(s);
yading@11:     h = s->opaque;
yading@11:     av_freep(&s->buffer);
yading@11:     if (s->write_flag)
yading@11:         av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
yading@11:     else
yading@11:         av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
yading@11:     av_free(s);
yading@11:     return ffurl_close(h);
yading@11: }
yading@11: 
yading@11: int avio_closep(AVIOContext **s)
yading@11: {
yading@11:     int ret = avio_close(*s);
yading@11:     *s = NULL;
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: int avio_printf(AVIOContext *s, const char *fmt, ...)
yading@11: {
yading@11:     va_list ap;
yading@11:     char buf[4096];
yading@11:     int ret;
yading@11: 
yading@11:     va_start(ap, fmt);
yading@11:     ret = vsnprintf(buf, sizeof(buf), fmt, ap);
yading@11:     va_end(ap);
yading@11:     avio_write(s, buf, strlen(buf));
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: int avio_pause(AVIOContext *s, int pause)
yading@11: {
yading@11:     if (!s->read_pause)
yading@11:         return AVERROR(ENOSYS);
yading@11:     return s->read_pause(s->opaque, pause);
yading@11: }
yading@11: 
yading@11: int64_t avio_seek_time(AVIOContext *s, int stream_index,
yading@11:                        int64_t timestamp, int flags)
yading@11: {
yading@11:     URLContext *h = s->opaque;
yading@11:     int64_t ret;
yading@11:     if (!s->read_seek)
yading@11:         return AVERROR(ENOSYS);
yading@11:     ret = s->read_seek(h, stream_index, timestamp, flags);
yading@11:     if (ret >= 0) {
yading@11:         int64_t pos;
yading@11:         s->buf_ptr = s->buf_end; // Flush buffer
yading@11:         pos = s->seek(h, 0, SEEK_CUR);
yading@11:         if (pos >= 0)
yading@11:             s->pos = pos;
yading@11:         else if (pos != AVERROR(ENOSYS))
yading@11:             ret = pos;
yading@11:     }
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: /* output in a dynamic buffer */
yading@11: 
yading@11: typedef struct DynBuffer {
yading@11:     int pos, size, allocated_size;
yading@11:     uint8_t *buffer;
yading@11:     int io_buffer_size;
yading@11:     uint8_t io_buffer[1];
yading@11: } DynBuffer;
yading@11: 
yading@11: static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
yading@11: {
yading@11:     DynBuffer *d = opaque;
yading@11:     unsigned new_size, new_allocated_size;
yading@11: 
yading@11:     /* reallocate buffer if needed */
yading@11:     new_size = d->pos + buf_size;
yading@11:     new_allocated_size = d->allocated_size;
yading@11:     if (new_size < d->pos || new_size > INT_MAX/2)
yading@11:         return -1;
yading@11:     while (new_size > new_allocated_size) {
yading@11:         if (!new_allocated_size)
yading@11:             new_allocated_size = new_size;
yading@11:         else
yading@11:             new_allocated_size += new_allocated_size / 2 + 1;
yading@11:     }
yading@11: 
yading@11:     if (new_allocated_size > d->allocated_size) {
yading@11:         d->buffer = av_realloc_f(d->buffer, 1, new_allocated_size);
yading@11:         if(d->buffer == NULL)
yading@11:              return AVERROR(ENOMEM);
yading@11:         d->allocated_size = new_allocated_size;
yading@11:     }
yading@11:     memcpy(d->buffer + d->pos, buf, buf_size);
yading@11:     d->pos = new_size;
yading@11:     if (d->pos > d->size)
yading@11:         d->size = d->pos;
yading@11:     return buf_size;
yading@11: }
yading@11: 
yading@11: static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
yading@11: {
yading@11:     unsigned char buf1[4];
yading@11:     int ret;
yading@11: 
yading@11:     /* packetized write: output the header */
yading@11:     AV_WB32(buf1, buf_size);
yading@11:     ret = dyn_buf_write(opaque, buf1, 4);
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11: 
yading@11:     /* then the data */
yading@11:     return dyn_buf_write(opaque, buf, buf_size);
yading@11: }
yading@11: 
yading@11: static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
yading@11: {
yading@11:     DynBuffer *d = opaque;
yading@11: 
yading@11:     if (whence == SEEK_CUR)
yading@11:         offset += d->pos;
yading@11:     else if (whence == SEEK_END)
yading@11:         offset += d->size;
yading@11:     if (offset < 0 || offset > 0x7fffffffLL)
yading@11:         return -1;
yading@11:     d->pos = offset;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
yading@11: {
yading@11:     DynBuffer *d;
yading@11:     unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
yading@11: 
yading@11:     if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
yading@11:         return -1;
yading@11:     d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
yading@11:     if (!d)
yading@11:         return AVERROR(ENOMEM);
yading@11:     d->io_buffer_size = io_buffer_size;
yading@11:     *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
yading@11:                             max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
yading@11:                             max_packet_size ? NULL : dyn_buf_seek);
yading@11:     if(!*s) {
yading@11:         av_free(d);
yading@11:         return AVERROR(ENOMEM);
yading@11:     }
yading@11:     (*s)->max_packet_size = max_packet_size;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: int avio_open_dyn_buf(AVIOContext **s)
yading@11: {
yading@11:     return url_open_dyn_buf_internal(s, 0);
yading@11: }
yading@11: 
yading@11: int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
yading@11: {
yading@11:     if (max_packet_size <= 0)
yading@11:         return -1;
yading@11:     return url_open_dyn_buf_internal(s, max_packet_size);
yading@11: }
yading@11: 
yading@11: int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
yading@11: {
yading@11:     DynBuffer *d = s->opaque;
yading@11:     int size;
yading@11:     static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0};
yading@11:     int padding = 0;
yading@11: 
yading@11:     /* don't attempt to pad fixed-size packet buffers */
yading@11:     if (!s->max_packet_size) {
yading@11:         avio_write(s, padbuf, sizeof(padbuf));
yading@11:         padding = FF_INPUT_BUFFER_PADDING_SIZE;
yading@11:     }
yading@11: 
yading@11:     avio_flush(s);
yading@11: 
yading@11:     *pbuffer = d->buffer;
yading@11:     size = d->size;
yading@11:     av_free(d);
yading@11:     av_free(s);
yading@11:     return size - padding;
yading@11: }