+++ /dev/null
-/*
- * Buffered I/O for ffmpeg system
- * Copyright (c) 2000,2001 Fabrice Bellard
- *
- * This library 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 of the License, or (at your option) any later version.
- *
- * This library 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-#include "avformat.h"
-#include "avio.h"
-#include <stdarg.h>
-
-#define IO_BUFFER_SIZE 32768
-
-int init_put_byte(ByteIOContext *s,
- unsigned char *buffer,
- int buffer_size,
- int write_flag,
- void *opaque,
- int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
- void (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
- int (*seek)(void *opaque, offset_t offset, int whence))
-{
- s->buffer = buffer;
- s->buffer_size = buffer_size;
- s->buf_ptr = buffer;
- s->write_flag = write_flag;
- if (!s->write_flag)
- s->buf_end = buffer;
- else
- s->buf_end = buffer + buffer_size;
- s->opaque = opaque;
- 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->is_streamed = 0;
- s->max_packet_size = 0;
- return 0;
-}
-
-
-static void flush_buffer(ByteIOContext *s)
-{
- if (s->buf_ptr > s->buffer) {
- if (s->write_packet)
- s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
- s->pos += s->buf_ptr - s->buffer;
- }
- s->buf_ptr = s->buffer;
-}
-
-void put_byte(ByteIOContext *s, int b)
-{
- *(s->buf_ptr)++ = b;
- if (s->buf_ptr >= s->buf_end)
- flush_buffer(s);
-}
-
-void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
-{
- int len;
-
- while (size > 0) {
- len = (s->buf_end - s->buf_ptr);
- if (len > size)
- len = size;
- memcpy(s->buf_ptr, buf, len);
- s->buf_ptr += len;
-
- if (s->buf_ptr >= s->buf_end)
- flush_buffer(s);
-
- buf += len;
- size -= len;
- }
-}
-
-void put_flush_packet(ByteIOContext *s)
-{
- flush_buffer(s);
- s->must_flush = 0;
-}
-
-offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
-{
- offset_t offset1;
-
- if (whence != SEEK_CUR && whence != SEEK_SET)
- return -EINVAL;
-
- if (s->write_flag) {
- if (whence == SEEK_CUR) {
- offset1 = s->pos + (s->buf_ptr - s->buffer);
- if (offset == 0)
- return offset1;
- offset += offset1;
- }
- offset1 = offset - s->pos;
- if (!s->must_flush &&
- offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
- /* can do the seek inside the buffer */
- s->buf_ptr = s->buffer + offset1;
- } else {
- if (!s->seek)
- return -EPIPE;
- flush_buffer(s);
- s->must_flush = 1;
- s->buf_ptr = s->buffer;
- s->seek(s->opaque, offset, SEEK_SET);
- s->pos = offset;
- }
- } else {
- if (whence == SEEK_CUR) {
- offset1 = s->pos - (s->buf_end - s->buffer) + (s->buf_ptr - s->buffer);
- if (offset == 0)
- return offset1;
- offset += offset1;
- }
- offset1 = offset - (s->pos - (s->buf_end - s->buffer));
- if (offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
- /* can do the seek inside the buffer */
- s->buf_ptr = s->buffer + offset1;
- } else {
- if (!s->seek)
- return -EPIPE;
- s->buf_ptr = s->buffer;
- s->buf_end = s->buffer;
- s->seek(s->opaque, offset, SEEK_SET);
- s->pos = offset;
- }
- s->eof_reached = 0;
- }
- return offset;
-}
-
-void url_fskip(ByteIOContext *s, offset_t offset)
-{
- url_fseek(s, offset, SEEK_CUR);
-}
-
-offset_t url_ftell(ByteIOContext *s)
-{
- return url_fseek(s, 0, SEEK_CUR);
-}
-
-int url_feof(ByteIOContext *s)
-{
- return s->eof_reached;
-}
-
-void put_le32(ByteIOContext *s, unsigned int val)
-{
- put_byte(s, val);
- put_byte(s, val >> 8);
- put_byte(s, val >> 16);
- put_byte(s, val >> 24);
-}
-
-void put_be32(ByteIOContext *s, unsigned int val)
-{
- put_byte(s, val >> 24);
- put_byte(s, val >> 16);
- put_byte(s, val >> 8);
- put_byte(s, val);
-}
-
-/* IEEE format is assumed */
-void put_be64_double(ByteIOContext *s, double val)
-{
- union {
- double d;
- uint64_t ull;
- } u;
- u.d = val;
- put_be64(s, u.ull);
-}
-
-void put_strz(ByteIOContext *s, const char *str)
-{
- if (str)
- put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
- else
- put_byte(s, 0);
-}
-
-void put_le64(ByteIOContext *s, uint64_t val)
-{
- put_le32(s, (uint32_t)(val & 0xffffffff));
- put_le32(s, (uint32_t)(val >> 32));
-}
-
-void put_be64(ByteIOContext *s, uint64_t val)
-{
- put_be32(s, (uint32_t)(val >> 32));
- put_be32(s, (uint32_t)(val & 0xffffffff));
-}
-
-void put_le16(ByteIOContext *s, unsigned int val)
-{
- put_byte(s, val);
- put_byte(s, val >> 8);
-}
-
-void put_be16(ByteIOContext *s, unsigned int val)
-{
- put_byte(s, val >> 8);
- put_byte(s, val);
-}
-
-void put_tag(ByteIOContext *s, const char *tag)
-{
- while (*tag) {
- put_byte(s, *tag++);
- }
-}
-
-/* Input stream */
-
-static void fill_buffer(ByteIOContext *s)
-{
- int len;
-
- /* no need to do anything if EOF already reached */
- if (s->eof_reached)
- return;
- len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
- if (len <= 0) {
- /* do not modify buffer if EOF reached so that a seek back can
- be done without rereading data */
- s->eof_reached = 1;
- } else {
- s->pos += len;
- s->buf_ptr = s->buffer;
- s->buf_end = s->buffer + len;
- }
-}
-
-/* NOTE: return 0 if EOF, so you cannot use it if EOF handling is
- necessary */
-/* XXX: put an inline version */
-int get_byte(ByteIOContext *s)
-{
- if (s->buf_ptr < s->buf_end) {
- return *s->buf_ptr++;
- } else {
- fill_buffer(s);
- if (s->buf_ptr < s->buf_end)
- return *s->buf_ptr++;
- else
- return 0;
- }
-}
-
-/* NOTE: return URL_EOF (-1) if EOF */
-int url_fgetc(ByteIOContext *s)
-{
- if (s->buf_ptr < s->buf_end) {
- return *s->buf_ptr++;
- } else {
- fill_buffer(s);
- if (s->buf_ptr < s->buf_end)
- return *s->buf_ptr++;
- else
- return URL_EOF;
- }
-}
-
-int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
-{
- int len, size1;
-
- size1 = size;
- while (size > 0) {
- len = s->buf_end - s->buf_ptr;
- if (len > size)
- len = size;
- if (len == 0) {
- fill_buffer(s);
- len = s->buf_end - s->buf_ptr;
- if (len == 0)
- break;
- } else {
- memcpy(buf, s->buf_ptr, len);
- buf += len;
- s->buf_ptr += len;
- size -= len;
- }
- }
- return size1 - size;
-}
-
-unsigned int get_le16(ByteIOContext *s)
-{
- unsigned int val;
- val = get_byte(s);
- val |= get_byte(s) << 8;
- return val;
-}
-
-unsigned int get_le32(ByteIOContext *s)
-{
- unsigned int val;
- val = get_byte(s);
- val |= get_byte(s) << 8;
- val |= get_byte(s) << 16;
- val |= get_byte(s) << 24;
- return val;
-}
-
-uint64_t get_le64(ByteIOContext *s)
-{
- uint64_t val;
- val = (uint64_t)get_le32(s);
- val |= (uint64_t)get_le32(s) << 32;
- return val;
-}
-
-unsigned int get_be16(ByteIOContext *s)
-{
- unsigned int val;
- val = get_byte(s) << 8;
- val |= get_byte(s);
- return val;
-}
-
-unsigned int get_be32(ByteIOContext *s)
-{
- unsigned int val;
- val = get_byte(s) << 24;
- val |= get_byte(s) << 16;
- val |= get_byte(s) << 8;
- val |= get_byte(s);
- return val;
-}
-
-double get_be64_double(ByteIOContext *s)
-{
- union {
- double d;
- uint64_t ull;
- } u;
-
- u.ull = get_be64(s);
- return u.d;
-}
-
-char *get_strz(ByteIOContext *s, char *buf, int maxlen)
-{
- int i = 0;
- char c;
-
- while ((c = get_byte(s))) {
- if (i < maxlen-1)
- buf[i++] = c;
- }
-
- buf[i] = 0; /* Ensure null terminated, but may be truncated */
-
- return buf;
-}
-
-uint64_t get_be64(ByteIOContext *s)
-{
- uint64_t val;
- val = (uint64_t)get_be32(s) << 32;
- val |= (uint64_t)get_be32(s);
- return val;
-}
-
-/* link with avio functions */
-
-static void url_write_packet(void *opaque, uint8_t *buf, int buf_size)
-{
- URLContext *h = opaque;
- url_write(h, buf, buf_size);
-}
-
-static int url_read_packet(void *opaque, uint8_t *buf, int buf_size)
-{
- URLContext *h = opaque;
- return url_read(h, buf, buf_size);
-}
-
-static int url_seek_packet(void *opaque, int64_t offset, int whence)
-{
- URLContext *h = opaque;
- url_seek(h, offset, whence);
- return 0;
-}
-
-int url_fdopen(ByteIOContext *s, URLContext *h)
-{
- uint8_t *buffer;
- int buffer_size, max_packet_size;
-
-
- max_packet_size = url_get_max_packet_size(h);
- if (max_packet_size) {
- buffer_size = max_packet_size; /* no need to bufferize more than one packet */
- } else {
- buffer_size = IO_BUFFER_SIZE;
- }
- buffer = av_malloc(buffer_size);
- if (!buffer)
- return -ENOMEM;
-
- if (init_put_byte(s, buffer, buffer_size,
- (h->flags & URL_WRONLY) != 0, h,
- url_read_packet, url_write_packet, url_seek_packet) < 0) {
- av_free(buffer);
- return -EIO;
- }
- s->is_streamed = h->is_streamed;
- s->max_packet_size = max_packet_size;
- return 0;
-}
-
-/* XXX: must be called before any I/O */
-int url_setbufsize(ByteIOContext *s, int buf_size)
-{
- uint8_t *buffer;
- buffer = av_malloc(buf_size);
- if (!buffer)
- return -ENOMEM;
-
- av_free(s->buffer);
- s->buffer = buffer;
- s->buffer_size = buf_size;
- s->buf_ptr = buffer;
- if (!s->write_flag)
- s->buf_end = buffer;
- else
- s->buf_end = buffer + buf_size;
- return 0;
-}
-
-/* NOTE: when opened as read/write, the buffers are only used for
- reading */
-int url_fopen(ByteIOContext *s, const char *filename, int flags)
-{
- URLContext *h;
- int err;
-
- err = url_open(&h, filename, flags);
- if (err < 0)
- return err;
- err = url_fdopen(s, h);
- if (err < 0) {
- url_close(h);
- return err;
- }
- return 0;
-}
-
-int url_fclose(ByteIOContext *s)
-{
- URLContext *h = s->opaque;
-
- av_free(s->buffer);
- memset(s, 0, sizeof(ByteIOContext));
- return url_close(h);
-}
-
-URLContext *url_fileno(ByteIOContext *s)
-{
- return s->opaque;
-}
-
-/* XXX: currently size is limited */
-int url_fprintf(ByteIOContext *s, const char *fmt, ...)
-{
- va_list ap;
- char buf[4096];
- int ret;
-
- va_start(ap, fmt);
- ret = vsnprintf(buf, sizeof(buf), fmt, ap);
- va_end(ap);
- put_buffer(s, buf, strlen(buf));
- return ret;
-}
-
-/* note: unlike fgets, the EOL character is not returned and a whole
- line is parsed. return NULL if first char read was EOF */
-char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
-{
- int c;
- char *q;
-
- c = url_fgetc(s);
- if (c == EOF)
- return NULL;
- q = buf;
- for(;;) {
- if (c == EOF || c == '\n')
- break;
- if ((q - buf) < buf_size - 1)
- *q++ = c;
- c = url_fgetc(s);
- }
- if (buf_size > 0)
- *q = '\0';
- return buf;
-}
-
-/*
- * Return the maximum packet size associated to packetized buffered file
- * handle. If the file is not packetized (stream like http or file on
- * disk), then 0 is returned.
- *
- * @param h buffered file handle
- * @return maximum packet size in bytes
- */
-int url_fget_max_packet_size(ByteIOContext *s)
-{
- return s->max_packet_size;
-}
-
-/* buffer handling */
-int url_open_buf(ByteIOContext *s, uint8_t *buf, int buf_size, int flags)
-{
- return init_put_byte(s, buf, buf_size,
- (flags & URL_WRONLY) != 0, NULL, NULL, NULL, NULL);
-}
-
-/* return the written or read size */
-int url_close_buf(ByteIOContext *s)
-{
- put_flush_packet(s);
- return s->buf_ptr - s->buffer;
-}
-
-/* output in a dynamic buffer */
-
-typedef struct DynBuffer {
- int pos, size, allocated_size;
- uint8_t *buffer;
- int io_buffer_size;
- uint8_t io_buffer[1];
-} DynBuffer;
-
-static void dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
-{
- DynBuffer *d = opaque;
- int new_size, new_allocated_size;
-
- /* reallocate buffer if needed */
- new_size = d->pos + buf_size;
- new_allocated_size = d->allocated_size;
- while (new_size > new_allocated_size) {
- if (!new_allocated_size)
- new_allocated_size = new_size;
- else
- new_allocated_size = (new_allocated_size * 3) / 2 + 1;
- }
-
- if (new_allocated_size > d->allocated_size) {
- d->buffer = av_realloc(d->buffer, new_allocated_size);
- if(d->buffer == NULL)
- return ;
- d->allocated_size = new_allocated_size;
- }
- memcpy(d->buffer + d->pos, buf, buf_size);
- d->pos = new_size;
- if (d->pos > d->size)
- d->size = d->pos;
-}
-
-static void dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
-{
- unsigned char buf1[4];
-
- /* packetized write: output the header */
- buf1[0] = (buf_size >> 24);
- buf1[1] = (buf_size >> 16);
- buf1[2] = (buf_size >> 8);
- buf1[3] = (buf_size);
- dyn_buf_write(opaque, buf1, 4);
-
- /* then the data */
- dyn_buf_write(opaque, buf, buf_size);
-}
-
-static int dyn_buf_seek(void *opaque, offset_t offset, int whence)
-{
- DynBuffer *d = opaque;
-
- if (whence == SEEK_CUR)
- offset += d->pos;
- else if (whence == SEEK_END)
- offset += d->size;
- if (offset < 0 || offset > 0x7fffffffLL)
- return -1;
- d->pos = offset;
- return 0;
-}
-
-static int url_open_dyn_buf_internal(ByteIOContext *s, int max_packet_size)
-{
- DynBuffer *d;
- int io_buffer_size, ret;
-
- if (max_packet_size)
- io_buffer_size = max_packet_size;
- else
- io_buffer_size = 1024;
-
- d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
- if (!d)
- return -1;
- d->io_buffer_size = io_buffer_size;
- d->buffer = NULL;
- d->pos = 0;
- d->size = 0;
- d->allocated_size = 0;
- ret = init_put_byte(s, d->io_buffer, io_buffer_size,
- 1, d, NULL,
- max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
- max_packet_size ? NULL : dyn_buf_seek);
- if (ret == 0) {
- s->max_packet_size = max_packet_size;
- }
- return ret;
-}
-
-/*
- * Open a write only memory stream.
- *
- * @param s new IO context
- * @return zero if no error.
- */
-int url_open_dyn_buf(ByteIOContext *s)
-{
- return url_open_dyn_buf_internal(s, 0);
-}
-
-/*
- * Open a write only packetized memory stream with a maximum packet
- * size of 'max_packet_size'. The stream is stored in a memory buffer
- * with a big endian 4 byte header giving the packet size in bytes.
- *
- * @param s new IO context
- * @param max_packet_size maximum packet size (must be > 0)
- * @return zero if no error.
- */
-int url_open_dyn_packet_buf(ByteIOContext *s, int max_packet_size)
-{
- if (max_packet_size <= 0)
- return -1;
- return url_open_dyn_buf_internal(s, max_packet_size);
-}
-
-/*
- * Return the written size and a pointer to the buffer. The buffer
- * must be freed with av_free().
- * @param s IO context
- * @param pointer to a byte buffer
- * @return the length of the byte buffer
- */
-int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
-{
- DynBuffer *d = s->opaque;
- int size;
-
- put_flush_packet(s);
-
- *pbuffer = d->buffer;
- size = d->size;
- av_free(d);
- return size;
-}
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