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author | Aidan MacDonald <amachronic@protonmail.com> | 2022-02-26 20:17:05 +0000 |
---|---|---|
committer | Aidan MacDonald <amachronic@protonmail.com> | 2022-03-04 08:44:56 -0500 |
commit | 3bd5f335f75398382944386cd36cfa3224e991c4 (patch) | |
tree | da2ef60f80a94bafb16c7561031ae4cb607f53fb | |
parent | ce4620413b42e93db4c58449691eec113f0723b1 (diff) | |
download | rockbox-3bd5f335f75398382944386cd36cfa3224e991c4.tar.gz rockbox-3bd5f335f75398382944386cd36cfa3224e991c4.zip |
inflate: Add helper for getting decompressed data size
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
-rw-r--r-- | firmware/common/inflate.c | 9 | ||||
-rw-r--r-- | firmware/include/inflate.h | 9 |
2 files changed, 18 insertions, 0 deletions
diff --git a/firmware/common/inflate.c b/firmware/common/inflate.c index 62661ee111..e39fe3a14e 100644 --- a/firmware/common/inflate.c +++ b/firmware/common/inflate.c | |||
@@ -782,3 +782,12 @@ uint32_t inflate_buffer_writer(const void* block, uint32_t block_size, void* ctx | |||
782 | struct inflate_bufferctx* c = ctx; | 782 | struct inflate_bufferctx* c = ctx; |
783 | return inflate_buffer_rw(c, c->buf, block, block_size); | 783 | return inflate_buffer_rw(c, c->buf, block, block_size); |
784 | } | 784 | } |
785 | |||
786 | uint32_t inflate_getsize_writer(const void* block, uint32_t block_size, void* ctx) | ||
787 | { | ||
788 | (void)block; | ||
789 | |||
790 | size_t* size = ctx; | ||
791 | *size += block_size; | ||
792 | return block_size; | ||
793 | } | ||
diff --git a/firmware/include/inflate.h b/firmware/include/inflate.h index 7dae0448e3..1fce186f34 100644 --- a/firmware/include/inflate.h +++ b/firmware/include/inflate.h | |||
@@ -58,4 +58,13 @@ struct inflate_bufferctx { | |||
58 | uint32_t inflate_buffer_reader(void* block, uint32_t block_size, void* ctx); | 58 | uint32_t inflate_buffer_reader(void* block, uint32_t block_size, void* ctx); |
59 | uint32_t inflate_buffer_writer(const void* block, uint32_t block_size, void* ctx); | 59 | uint32_t inflate_buffer_writer(const void* block, uint32_t block_size, void* ctx); |
60 | 60 | ||
61 | // dummy writer used if you just want to figure out how big the decompressed | ||
62 | // data will be. It does not actually write any data. Example usage: | ||
63 | // | ||
64 | // size_t size = 0; | ||
65 | // inflate(it, st, read, rctx, inflate_getsize_writer, &size); | ||
66 | // | ||
67 | // Now 'size' will be the size of the decompressed data (assuming no errors). | ||
68 | uint32_t inflate_getsize_writer(const void* block, uint32_t block_size, void* ctx); | ||
69 | |||
61 | #endif | 70 | #endif |