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Add BinarySource_REWIND_TO.

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A partial cherry-pick of commit 32d61d7c48
omitting the parts that aren't needed on this branch.
This commit is contained in:
Simon Tatham 2020-01-06 19:55:41 +00:00
parent a56b79b598
commit d51b3d7eb6
2 changed files with 17 additions and 0 deletions
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11
marshal.c
View File

@ -235,6 +235,17 @@ ptrlen BinarySource_get_pstring(BinarySource *src)
return make_ptrlen(consume(len), len);
}
void BinarySource_REWIND_TO__(BinarySource *src, size_t pos)
{
if (pos <= src->len) {
src->pos = pos;
src->err = BSE_NO_ERROR; /* clear any existing error */
} else {
src->pos = src->len;
src->err = BSE_OUT_OF_DATA; /* new error if we rewind out of range */
}
}
static void stdio_sink_write(BinarySink *bs, const void *data, size_t len)
{
stdio_sink *sink = BinarySink_DOWNCAST(bs, stdio_sink);

6
marshal.h
View File

@ -255,6 +255,10 @@ static inline void BinarySource_INIT__(BinarySource *src, ptrlen data)
(object)->binarysource_)
#define BinarySource_COPIED(obj) \
((obj)->binarysource_->binarysource_ = (obj)->binarysource_)
#define BinarySource_REWIND_TO(src, pos) \
BinarySource_REWIND_TO__((src)->binarysource_, pos)
#define BinarySource_REWIND(src) \
BinarySource_REWIND_TO__((src)->binarysource_, 0)
#define get_data(src, len) \
BinarySource_get_data(BinarySource_UPCAST(src), len)
@ -305,6 +309,8 @@ ptrlen BinarySource_get_pstring(BinarySource *);
mp_int *BinarySource_get_mp_ssh1(BinarySource *src);
mp_int *BinarySource_get_mp_ssh2(BinarySource *src);
void BinarySource_REWIND_TO__(BinarySource *src, size_t pos);
/*
* A couple of useful standard BinarySink implementations, which live
* as sensibly here as anywhere else: one that makes a BinarySink