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large mp4 header handling

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This commit is contained in:
Philippe G
2020-06-18 23:25:18 -07:00
parent b6aa8f9e96
commit 84190e7c6e
5 changed files with 68 additions and 5 deletions
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50
components/squeezelite/buffer.c
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@@ -100,6 +100,56 @@ void _buf_resize(struct buffer *buf, size_t size) {
buf->base_size = size;
}
void _buf_unwrap(struct buffer *buf, size_t cont) {
ssize_t len, by = cont - (buf->wrap - buf->readp);
size_t size;
u8_t *scratch;
// do nothing if we have enough space
if (by <= 0 || cont >= buf->size) return;
// buffer already unwrapped, just move it up
if (buf->writep >= buf->readp) {
memmove(buf->readp - by, buf->readp, buf->writep - buf->readp);
buf->readp -= by;
buf->writep -= by;
return;
}
// how much is overlapping
size = by - (buf->readp - buf->writep);
len = buf->writep - buf->buf;
// buffer is wrapped and enough free space to move data up directly
if (size <= 0) {
memmove(buf->readp - by, buf->readp, buf->wrap - buf->readp);
buf->readp -= by;
memcpy(buf->wrap - by, buf->buf, min(len, by));
if (len > by) {
memmove(buf->buf, buf->buf + by, len - by);
buf->writep -= by;
} else buf->writep += buf->size - by;
return;
}
scratch = malloc(size);
// buffer is wrapped but not enough free room => use scratch zone
if (scratch) {
memcpy(scratch, buf->writep - size, size);
memmove(buf->readp - by, buf->readp, buf->wrap - buf->readp);
buf->readp -= by;
memcpy(buf->wrap - by, buf->buf, by);
memmove(buf->buf, buf->buf + by, len - by - size);
buf->writep -= by;
memcpy(buf->writep - size, scratch, size);
free(scratch);
} else {
_buf_unwrap(buf, cont / 2);
_buf_unwrap(buf, cont - cont / 2);
}
}
void buf_init(struct buffer *buf, size_t size) {
buf->buf = malloc(size);
buf->readp = buf->buf;