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mpv/stream/stream.c
Leo Izen 9b5672ebed manpage: document improved --playlist security 
Recent versions of mpv have applied security checks to --playlist
that previously only existed if playlist files were played as an
input directly. This commit documents this change and how to work
around it, in the event that playlist files are trusted.
2020-11-18 17:30:07 -05:00

901 lines
26 KiB
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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <strings.h>
#include <assert.h>
#include "osdep/io.h"
#include "mpv_talloc.h"
#include "config.h"
#include "common/common.h"
#include "common/global.h"
#include "misc/bstr.h"
#include "misc/thread_tools.h"
#include "common/msg.h"
#include "options/m_config.h"
#include "options/options.h"
#include "options/path.h"
#include "osdep/timer.h"
#include "stream.h"
#include "options/m_option.h"
#include "options/m_config.h"
extern const stream_info_t stream_info_cdda;
extern const stream_info_t stream_info_dvb;
extern const stream_info_t stream_info_null;
extern const stream_info_t stream_info_memory;
extern const stream_info_t stream_info_mf;
extern const stream_info_t stream_info_ffmpeg;
extern const stream_info_t stream_info_ffmpeg_unsafe;
extern const stream_info_t stream_info_avdevice;
extern const stream_info_t stream_info_file;
extern const stream_info_t stream_info_slice;
extern const stream_info_t stream_info_fd;
extern const stream_info_t stream_info_ifo_dvdnav;
extern const stream_info_t stream_info_dvdnav;
extern const stream_info_t stream_info_bdmv_dir;
extern const stream_info_t stream_info_bluray;
extern const stream_info_t stream_info_bdnav;
extern const stream_info_t stream_info_edl;
extern const stream_info_t stream_info_libarchive;
extern const stream_info_t stream_info_cb;
static const stream_info_t *const stream_list[] = {
#if HAVE_CDDA
&stream_info_cdda,
#endif
&stream_info_ffmpeg,
&stream_info_ffmpeg_unsafe,
&stream_info_avdevice,
#if HAVE_DVBIN
&stream_info_dvb,
#endif
#if HAVE_DVDNAV
&stream_info_ifo_dvdnav,
&stream_info_dvdnav,
#endif
#if HAVE_LIBBLURAY
&stream_info_bdmv_dir,
&stream_info_bluray,
&stream_info_bdnav,
#endif
#if HAVE_LIBARCHIVE
&stream_info_libarchive,
#endif
&stream_info_memory,
&stream_info_null,
&stream_info_mf,
&stream_info_edl,
&stream_info_file,
&stream_info_slice,
&stream_info_fd,
&stream_info_cb,
NULL
};
// Because of guarantees documented on STREAM_BUFFER_SIZE.
// Half the buffer is used as forward buffer, the other for seek-back.
#define STREAM_MIN_BUFFER_SIZE (STREAM_BUFFER_SIZE * 2)
// Sort of arbitrary; keep *2 of it comfortably within integer limits.
// Must be power of 2.
#define STREAM_MAX_BUFFER_SIZE (512 * 1024 * 1024)
struct stream_opts {
int64_t buffer_size;
int load_unsafe_playlists;
};
#define OPT_BASE_STRUCT struct stream_opts
const struct m_sub_options stream_conf = {
.opts = (const struct m_option[]){
{"stream-buffer-size", OPT_BYTE_SIZE(buffer_size),
M_RANGE(STREAM_MIN_BUFFER_SIZE, STREAM_MAX_BUFFER_SIZE)},
{"load-unsafe-playlists", OPT_FLAG(load_unsafe_playlists)},
{0}
},
.size = sizeof(struct stream_opts),
.defaults = &(const struct stream_opts){
.buffer_size = 128 * 1024,
},
};
// return -1 if not hex char
static int hex2dec(char c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'A' && c <= 'F')
return 10 + c - 'A';
if (c >= 'a' && c <= 'f')
return 10 + c - 'a';
return -1;
}
// Replace escape sequences in an URL (or a part of an URL)
void mp_url_unescape_inplace(char *url)
{
for (int len = strlen(url), i = 0, o = 0; i <= len;) {
if ((url[i] != '%') || (i > len - 3)) { // %NN can't start after len-3
url[o++] = url[i++];
continue;
}
int msd = hex2dec(url[i + 1]),
lsd = hex2dec(url[i + 2]);
if (msd >= 0 && lsd >= 0) {
url[o++] = 16 * msd + lsd;
i += 3;
} else {
url[o++] = url[i++];
url[o++] = url[i++];
url[o++] = url[i++];
}
}
}
static const char hex_digits[] = "0123456789ABCDEF";
static const char url_default_ok[] = "abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789"
"-._~";
// Escape according to http://tools.ietf.org/html/rfc3986#section-2.1
// Only unreserved characters are not escaped.
// The argument ok (if not NULL) is as follows:
// ok[0] != '~': additional characters that are not escaped
// ok[0] == '~': do not escape anything but these characters
// (can't override the unreserved characters, which are
// never escaped)
char *mp_url_escape(void *talloc_ctx, const char *url, const char *ok)
{
char *rv = talloc_size(talloc_ctx, strlen(url) * 3 + 1);
char *out = rv;
bool negate = ok && ok[0] == '~';
for (char c; (c = *url); url++) {
bool as_is = negate ? !strchr(ok + 1, c)
: (strchr(url_default_ok, c) || (ok && strchr(ok, c)));
if (as_is) {
*out++ = c;
} else {
unsigned char v = c;
*out++ = '%';
*out++ = hex_digits[v / 16];
*out++ = hex_digits[v % 16];
}
}
*out = 0;
return rv;
}
static const char *match_proto(const char *url, const char *proto)
{
int l = strlen(proto);
if (l > 0) {
if (strncasecmp(url, proto, l) == 0 && strncmp("://", url + l, 3) == 0)
return url + l + 3;
} else if (!mp_is_url(bstr0(url))) {
return url; // pure filenames
}
return NULL;
}
// src and new are both STREAM_ORIGIN_* values. This checks whether a stream
// with flags "new" can be opened from the "src". On success, return
// new origin, on incompatibility return 0.
static int check_origin(int src, int new)
{
switch (src) {
case STREAM_ORIGIN_DIRECT:
case STREAM_ORIGIN_UNSAFE:
// Allow anything, but constrain it to the new origin.
return new;
case STREAM_ORIGIN_FS:
// From unix FS, allow all but unsafe.
if (new == STREAM_ORIGIN_FS || new == STREAM_ORIGIN_NET)
return new;
break;
case STREAM_ORIGIN_NET:
// Allow only other network links.
if (new == STREAM_ORIGIN_NET)
return new;
break;
}
return 0;
}
// Read len bytes from the start position, and wrap around as needed. Limit the
// actually read data to the size of the buffer. Return amount of copied bytes.
// len: max bytes to copy to dst
// pos: index into s->buffer[], e.g. s->buf_start is byte 0
// returns: bytes copied to dst (limited by len and available buffered data)
static int ring_copy(struct stream *s, void *dst, int len, int pos)
{
assert(len >= 0);
if (pos < s->buf_start || pos > s->buf_end)
return 0;
int copied = 0;
len = MPMIN(len, s->buf_end - pos);
if (len && pos <= s->buffer_mask) {
int copy = MPMIN(len, s->buffer_mask + 1 - pos);
memcpy(dst, &s->buffer[pos], copy);
copied += copy;
len -= copy;
pos += copy;
}
if (len) {
memcpy((char *)dst + copied, &s->buffer[pos & s->buffer_mask], len);
copied += len;
}
return copied;
}
// Resize the current stream buffer. Uses a larger size if needed to keep data.
// Does nothing if the size is adequate. Calling this with 0 ensures it uses the
// default buffer size if possible.
// The caller must check whether enough data was really allocated.
// keep: keep at least [buf_end-keep, buf_end] (used for assert()s only)
// new: new total size of buffer
// returns: false if buffer allocation failed, true if reallocated or size ok
static bool stream_resize_buffer(struct stream *s, int keep, int new)
{
assert(keep >= s->buf_end - s->buf_cur);
assert(keep <= new);
new = MPMAX(new, s->requested_buffer_size);
new = MPMIN(new, STREAM_MAX_BUFFER_SIZE);
new = mp_round_next_power_of_2(new);
assert(keep <= new); // can't fail (if old buffer size was valid)
if (new == s->buffer_mask + 1)
return true;
int old_pos = s->buf_cur - s->buf_start;
int old_used_len = s->buf_end - s->buf_start;
int skip = old_used_len > new ? old_used_len - new : 0;
MP_DBG(s, "resize stream to %d bytes, drop %d bytes\n", new, skip);
void *nbuf = ta_alloc_size(s, new);
if (!nbuf)
return false; // oom; tolerate it, caller needs to check if required
int new_len = 0;
if (s->buffer)
new_len = ring_copy(s, nbuf, new, s->buf_start + skip);
assert(new_len == old_used_len - skip);
assert(old_pos >= skip); // "keep" too low
assert(old_pos - skip <= new_len);
s->buf_start = 0;
s->buf_cur = old_pos - skip;
s->buf_end = new_len;
ta_free(s->buffer);
s->buffer = nbuf;
s->buffer_mask = new - 1;
return true;
}
static int stream_create_instance(const stream_info_t *sinfo,
struct stream_open_args *args,
struct stream **ret)
{
const char *url = args->url;
int flags = args->flags;
*ret = NULL;
const char *path = url;
if (flags & STREAM_LOCAL_FS_ONLY) {
if (!sinfo->local_fs)
return STREAM_NO_MATCH;
} else {
for (int n = 0; sinfo->protocols && sinfo->protocols[n]; n++) {
path = match_proto(url, sinfo->protocols[n]);
if (path)
break;
}
if (!path)
return STREAM_NO_MATCH;
}
stream_t *s = talloc_zero(NULL, stream_t);
s->global = args->global;
struct stream_opts *opts = mp_get_config_group(s, s->global, &stream_conf);
if (flags & STREAM_SILENT) {
s->log = mp_null_log;
} else {
s->log = mp_log_new(s, s->global->log, sinfo->name);
}
s->info = sinfo;
s->cancel = args->cancel;
s->url = talloc_strdup(s, url);
s->path = talloc_strdup(s, path);
s->mode = flags & (STREAM_READ | STREAM_WRITE);
s->requested_buffer_size = opts->buffer_size;
if (flags & STREAM_LESS_NOISE)
mp_msg_set_max_level(s->log, MSGL_WARN);
int opt;
mp_read_option_raw(s->global, "access-references", &m_option_type_flag, &opt);
s->access_references = opt;
MP_VERBOSE(s, "Opening %s\n", url);
if (strlen(url) > INT_MAX / 8) {
MP_ERR(s, "URL too large.\n");
talloc_free(s);
return STREAM_ERROR;
}
if ((s->mode & STREAM_WRITE) && !sinfo->can_write) {
MP_DBG(s, "No write access implemented.\n");
talloc_free(s);
return STREAM_NO_MATCH;
}
s->stream_origin = flags & STREAM_ORIGIN_MASK; // pass through by default
if (opts->load_unsafe_playlists) {
s->stream_origin = STREAM_ORIGIN_DIRECT;
} else if (sinfo->stream_origin) {
s->stream_origin = check_origin(s->stream_origin, sinfo->stream_origin);
}
if (!s->stream_origin) {
talloc_free(s);
return STREAM_UNSAFE;
}
int r = STREAM_UNSUPPORTED;
if (sinfo->open2) {
r = sinfo->open2(s, args);
} else if (!args->special_arg) {
r = (sinfo->open)(s);
}
if (r != STREAM_OK) {
talloc_free(s);
return r;
}
if (!stream_resize_buffer(s, 0, 0)) {
free_stream(s);
return STREAM_ERROR;
}
assert(s->seekable == !!s->seek);
if (s->mime_type)
MP_VERBOSE(s, "Mime-type: '%s'\n", s->mime_type);
MP_DBG(s, "Stream opened successfully.\n");
*ret = s;
return STREAM_OK;
}
int stream_create_with_args(struct stream_open_args *args, struct stream **ret)
{
assert(args->url);
int r = STREAM_NO_MATCH;
*ret = NULL;
// Open stream proper
if (args->sinfo) {
r = stream_create_instance(args->sinfo, args, ret);
} else {
for (int i = 0; stream_list[i]; i++) {
r = stream_create_instance(stream_list[i], args, ret);
if (r == STREAM_OK)
break;
if (r == STREAM_NO_MATCH || r == STREAM_UNSUPPORTED)
continue;
if (r == STREAM_UNSAFE)
continue;
break;
}
}
if (!*ret && !(args->flags & STREAM_SILENT) && !mp_cancel_test(args->cancel))
{
struct mp_log *log = mp_log_new(NULL, args->global->log, "!stream");
if (r == STREAM_UNSAFE) {
mp_err(log, "\nRefusing to load potentially unsafe URL from a playlist.\n"
"Use the --load-unsafe-playlists option to load it anyway.\n\n");
} else if (r == STREAM_NO_MATCH || r == STREAM_UNSUPPORTED) {
mp_err(log, "No protocol handler found to open URL %s\n", args->url);
mp_err(log, "The protocol is either unsupported, or was disabled "
"at compile-time.\n");
} else {
mp_err(log, "Failed to open %s.\n", args->url);
}
talloc_free(log);
}
return r;
}
struct stream *stream_create(const char *url, int flags,
struct mp_cancel *c, struct mpv_global *global)
{
struct stream_open_args args = {
.global = global,
.cancel = c,
.flags = flags,
.url = url,
};
struct stream *s;
stream_create_with_args(&args, &s);
return s;
}
stream_t *open_output_stream(const char *filename, struct mpv_global *global)
{
return stream_create(filename, STREAM_ORIGIN_DIRECT | STREAM_WRITE,
NULL, global);
}
// Read function bypassing the local stream buffer. This will not write into
// s->buffer, but into buf[0..len] instead.
// Returns 0 on error or EOF, and length of bytes read on success.
// Partial reads are possible, even if EOF is not reached.
static int stream_read_unbuffered(stream_t *s, void *buf, int len)
{
assert(len >= 0);
if (len <= 0)
return 0;
int res = 0;
// we will retry even if we already reached EOF previously.
if (s->fill_buffer && !mp_cancel_test(s->cancel))
res = s->fill_buffer(s, buf, len);
if (res <= 0) {
s->eof = 1;
return 0;
}
assert(res <= len);
// When reading succeeded we are obviously not at eof.
s->eof = 0;
s->pos += res;
s->total_unbuffered_read_bytes += res;
return res;
}
// Ask for having at most "forward" bytes ready to read in the buffer.
// To read everything, you may have to call this in a loop.
// forward: desired amount of bytes in buffer after s->cur_pos
// returns: progress (false on EOF or on OOM or if enough data was available)
static bool stream_read_more(struct stream *s, int forward)
{
assert(forward >= 0);
int forward_avail = s->buf_end - s->buf_cur;
if (forward_avail >= forward)
return false;
// Avoid that many small reads will lead to many low-level read calls.
forward = MPMAX(forward, s->requested_buffer_size / 2);
assert(forward_avail < forward);
// Keep guaranteed seek-back.
int buf_old = MPMIN(s->buf_cur - s->buf_start, s->requested_buffer_size / 2);
if (!stream_resize_buffer(s, buf_old + forward_avail, buf_old + forward))
return false;
int buf_alloc = s->buffer_mask + 1;
assert(s->buf_start <= s->buf_cur);
assert(s->buf_cur <= s->buf_end);
assert(s->buf_cur < buf_alloc * 2);
assert(s->buf_end < buf_alloc * 2);
assert(s->buf_start < buf_alloc);
// Note: read as much as possible, even if forward is much smaller. Do
// this because the stream buffer is supposed to set an approx. minimum
// read size on it.
int read = buf_alloc - (buf_old + forward_avail); // free buffer past end
int pos = s->buf_end & s->buffer_mask;
read = MPMIN(read, buf_alloc - pos);
// Note: if wrap-around happens, we need to make two calls. This may
// affect latency (e.g. waiting for new data on a socket), so do only
// 1 read call always.
read = stream_read_unbuffered(s, &s->buffer[pos], read);
s->buf_end += read;
// May have overwritten old data.
if (s->buf_end - s->buf_start >= buf_alloc) {
assert(s->buf_end >= buf_alloc);
s->buf_start = s->buf_end - buf_alloc;
assert(s->buf_start <= s->buf_cur);
assert(s->buf_cur <= s->buf_end);
if (s->buf_start >= buf_alloc) {
s->buf_start -= buf_alloc;
s->buf_cur -= buf_alloc;
s->buf_end -= buf_alloc;
}
}
// Must not have overwritten guaranteed old data.
assert(s->buf_cur - s->buf_start >= buf_old);
if (s->buf_cur < s->buf_end)
s->eof = 0;
return !!read;
}
// Read between 1..buf_size bytes of data, return how much data has been read.
// Return 0 on EOF, error, or if buf_size was 0.
int stream_read_partial(stream_t *s, void *buf, int buf_size)
{
assert(s->buf_cur <= s->buf_end);
assert(buf_size >= 0);
if (s->buf_cur == s->buf_end && buf_size > 0) {
if (buf_size > (s->buffer_mask + 1) / 2) {
// Direct read if the buffer is too small anyway.
stream_drop_buffers(s);
return stream_read_unbuffered(s, buf, buf_size);
}
stream_read_more(s, 1);
}
int res = ring_copy(s, buf, buf_size, s->buf_cur);
s->buf_cur += res;
return res;
}
// Slow version of stream_read_char(); called by it if the buffer is empty.
int stream_read_char_fallback(stream_t *s)
{
uint8_t c;
return stream_read_partial(s, &c, 1) ? c : -256;
}
int stream_read(stream_t *s, void *mem, int total)
{
int len = total;
while (len > 0) {
int read = stream_read_partial(s, mem, len);
if (read <= 0)
break; // EOF
mem = (char *)mem + read;
len -= read;
}
total -= len;
return total;
}
// Read ahead so that at least forward_size bytes are readable ahead. Returns
// the actual forward amount available (restricted by EOF or buffer limits).
int stream_peek(stream_t *s, int forward_size)
{
while (stream_read_more(s, forward_size)) {}
return s->buf_end - s->buf_cur;
}
// Like stream_read(), but do not advance the current position. This may resize
// the buffer to satisfy the read request.
int stream_read_peek(stream_t *s, void *buf, int buf_size)
{
stream_peek(s, buf_size);
return ring_copy(s, buf, buf_size, s->buf_cur);
}
int stream_write_buffer(stream_t *s, void *buf, int len)
{
if (!s->write_buffer)
return -1;
int orig_len = len;
while (len) {
int w = s->write_buffer(s, buf, len);
if (w <= 0)
return -1;
s->pos += w;
buf = (char *)buf + w;
len -= w;
}
return orig_len;
}
// Drop len bytes form input, possibly reading more until all is skipped. If
// EOF or an error was encountered before all could be skipped, return false,
// otherwise return true.
static bool stream_skip_read(struct stream *s, int64_t len)
{
while (len > 0) {
unsigned int left = s->buf_end - s->buf_cur;
if (!left) {
if (!stream_read_more(s, 1))
return false;
continue;
}
unsigned skip = MPMIN(len, left);
s->buf_cur += skip;
len -= skip;
}
return true;
}
// Drop the internal buffer. Note that this will advance the stream position
// (as seen by stream_tell()), because the real stream position is ahead of the
// logical stream position by the amount of buffered but not yet read data.
void stream_drop_buffers(stream_t *s)
{
s->pos = stream_tell(s);
s->buf_start = s->buf_cur = s->buf_end = 0;
s->eof = 0;
stream_resize_buffer(s, 0, 0);
}
// Seek function bypassing the local stream buffer.
static bool stream_seek_unbuffered(stream_t *s, int64_t newpos)
{
if (newpos != s->pos) {
MP_VERBOSE(s, "stream level seek from %" PRId64 " to %" PRId64 "\n",
s->pos, newpos);
s->total_stream_seeks++;
if (newpos > s->pos && !s->seekable) {
MP_ERR(s, "Cannot seek forward in this stream\n");
return false;
}
if (newpos < s->pos && !s->seekable) {
MP_ERR(s, "Cannot seek backward in linear streams!\n");
return false;
}
if (s->seek(s, newpos) <= 0) {
int level = mp_cancel_test(s->cancel) ? MSGL_V : MSGL_ERR;
MP_MSG(s, level, "Seek failed (to %lld, size %lld)\n",
(long long)newpos, (long long)stream_get_size(s));
return false;
}
stream_drop_buffers(s);
s->pos = newpos;
}
return true;
}
bool stream_seek(stream_t *s, int64_t pos)
{
MP_TRACE(s, "seek request from %" PRId64 " to %" PRId64 "\n",
stream_tell(s), pos);
s->eof = 0; // eof should be set only on read; seeking always clears it
if (pos < 0) {
MP_ERR(s, "Invalid seek to negative position %lld!\n", (long long)pos);
pos = 0;
}
if (pos <= s->pos) {
int64_t x = pos - (s->pos - (int)s->buf_end);
if (x >= (int)s->buf_start) {
s->buf_cur = x;
assert(s->buf_cur >= s->buf_start);
assert(s->buf_cur <= s->buf_end);
return true;
}
}
if (s->mode == STREAM_WRITE)
return s->seekable && s->seek(s, pos);
// Skip data instead of performing a seek in some cases.
if (pos >= s->pos &&
((!s->seekable && s->fast_skip) ||
pos - s->pos <= s->requested_buffer_size))
{
return stream_skip_read(s, pos - stream_tell(s));
}
return stream_seek_unbuffered(s, pos);
}
// Like stream_seek(), but strictly prefer skipping data instead of failing, if
// it's a forward-seek.
bool stream_seek_skip(stream_t *s, int64_t pos)
{
uint64_t cur_pos = stream_tell(s);
if (cur_pos == pos)
return true;
return !s->seekable && pos > cur_pos
? stream_skip_read(s, pos - cur_pos)
: stream_seek(s, pos);
}
int stream_control(stream_t *s, int cmd, void *arg)
{
return s->control ? s->control(s, cmd, arg) : STREAM_UNSUPPORTED;
}
// Return the current size of the stream, or a negative value if unknown.
int64_t stream_get_size(stream_t *s)
{
return s->get_size ? s->get_size(s) : -1;
}
void free_stream(stream_t *s)
{
if (!s)
return;
if (s->close)
s->close(s);
talloc_free(s);
}
static const char *const bom[3] = {"\xEF\xBB\xBF", "\xFF\xFE", "\xFE\xFF"};
// Return utf16 argument for stream_read_line
int stream_skip_bom(struct stream *s)
{
char buf[4];
int len = stream_read_peek(s, buf, sizeof(buf));
bstr data = {buf, len};
for (int n = 0; n < 3; n++) {
if (bstr_startswith0(data, bom[n])) {
stream_seek_skip(s, stream_tell(s) + strlen(bom[n]));
return n;
}
}
return -1; // default to 8 bit codepages
}
// Read the rest of the stream into memory (current pos to EOF), and return it.
// talloc_ctx: used as talloc parent for the returned allocation
// max_size: must be set to >0. If the file is larger than that, it is treated
// as error. This is a minor robustness measure.
// returns: stream contents, or .start/.len set to NULL on error
// If the file was empty, but no error happened, .start will be non-NULL and
// .len will be 0.
// For convenience, the returned buffer is padded with a 0 byte. The padding
// is not included in the returned length.
struct bstr stream_read_complete(struct stream *s, void *talloc_ctx,
int max_size)
{
if (max_size > 1000000000)
abort();
int bufsize;
int total_read = 0;
int padding = 1;
char *buf = NULL;
int64_t size = stream_get_size(s) - stream_tell(s);
if (size > max_size)
return (struct bstr){NULL, 0};
if (size > 0)
bufsize = size + padding;
else
bufsize = 1000;
while (1) {
buf = talloc_realloc_size(talloc_ctx, buf, bufsize);
int readsize = stream_read(s, buf + total_read, bufsize - total_read);
total_read += readsize;
if (total_read < bufsize)
break;
if (bufsize > max_size) {
talloc_free(buf);
return (struct bstr){NULL, 0};
}
bufsize = MPMIN(bufsize + (bufsize >> 1), max_size + padding);
}
buf = talloc_realloc_size(talloc_ctx, buf, total_read + padding);
memset(&buf[total_read], 0, padding);
return (struct bstr){buf, total_read};
}
struct bstr stream_read_file(const char *filename, void *talloc_ctx,
struct mpv_global *global, int max_size)
{
struct bstr res = {0};
int flags = STREAM_ORIGIN_DIRECT | STREAM_READ | STREAM_LOCAL_FS_ONLY |
STREAM_LESS_NOISE;
stream_t *s = stream_create(filename, flags, NULL, global);
if (s) {
res = stream_read_complete(s, talloc_ctx, max_size);
free_stream(s);
}
return res;
}
char **stream_get_proto_list(void)
{
char **list = NULL;
int num = 0;
for (int i = 0; stream_list[i]; i++) {
const stream_info_t *stream_info = stream_list[i];
if (!stream_info->protocols)
continue;
for (int j = 0; stream_info->protocols[j]; j++) {
if (*stream_info->protocols[j] == '\0')
continue;
MP_TARRAY_APPEND(NULL, list, num,
talloc_strdup(NULL, stream_info->protocols[j]));
}
}
MP_TARRAY_APPEND(NULL, list, num, NULL);
return list;
}
void stream_print_proto_list(struct mp_log *log)
{
int count = 0;
mp_info(log, "Protocols:\n\n");
char **list = stream_get_proto_list();
for (int i = 0; list[i]; i++) {
mp_info(log, " %s://\n", list[i]);
count++;
talloc_free(list[i]);
}
talloc_free(list);
mp_info(log, "\nTotal: %d protocols\n", count);
}
bool stream_has_proto(const char *proto)
{
for (int i = 0; stream_list[i]; i++) {
const stream_info_t *stream_info = stream_list[i];
for (int j = 0; stream_info->protocols && stream_info->protocols[j]; j++) {
if (strcmp(stream_info->protocols[j], proto) == 0)
return true;
}
}
return false;
}
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