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inflate: Add helper for getting decompressed data size

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Helper for another semi-typical operation: find out how big of a
buffer should be allocated before decompressing. This can be useful
when the stream container doesn't specify the decompressed size.

Change-Id: I5f1536f809bb6f9bc6023120c024c3de7cea4269
This commit is contained in:
Aidan MacDonald 2022-02-26 20:17:05 +00:00
parent ce4620413b
commit 3bd5f335f7
2 changed files with 18 additions and 0 deletions
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9
firmware/common/inflate.c
View file

@ -782,3 +782,12 @@ uint32_t inflate_buffer_writer(const void* block, uint32_t block_size, void* ctx
struct inflate_bufferctx* c = ctx;
return inflate_buffer_rw(c, c->buf, block, block_size);
}
uint32_t inflate_getsize_writer(const void* block, uint32_t block_size, void* ctx)
{
(void)block;
size_t* size = ctx;
*size += block_size;
return block_size;
}

9
firmware/include/inflate.h
View file

@ -58,4 +58,13 @@ struct inflate_bufferctx {
uint32_t inflate_buffer_reader(void* block, uint32_t block_size, void* ctx);
uint32_t inflate_buffer_writer(const void* block, uint32_t block_size, void* ctx);
// dummy writer used if you just want to figure out how big the decompressed
// data will be. It does not actually write any data. Example usage:
//
// size_t size = 0;
// inflate(it, st, read, rctx, inflate_getsize_writer, &size);
//
// Now 'size' will be the size of the decompressed data (assuming no errors).
uint32_t inflate_getsize_writer(const void* block, uint32_t block_size, void* ctx);
#endif