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-rw-r--r--src/liblzma/common/alone_decoder.c22
-rw-r--r--src/liblzma/common/alone_decoder.h5
-rw-r--r--src/liblzma/common/auto_decoder.c2
3 files changed, 18 insertions, 11 deletions
diff --git a/src/liblzma/common/alone_decoder.c b/src/liblzma/common/alone_decoder.c
index 678c79e6..c25112e6 100644
--- a/src/liblzma/common/alone_decoder.c
+++ b/src/liblzma/common/alone_decoder.c
@@ -26,6 +26,11 @@ struct lzma_coder_s {
SEQ_CODE,
} sequence;
+ /// If true, reject files that are unlikely to be .lzma files.
+ /// If false, more non-.lzma files get accepted and will give
+ /// LZMA_DATA_ERROR either immediately or after a few output bytes.
+ bool picky;
+
/// Position in the header fields
size_t pos;
@@ -68,13 +73,13 @@ alone_decode(lzma_coder *coder,
|= (size_t)(in[*in_pos]) << (coder->pos * 8);
if (++coder->pos == 4) {
- if (coder->options.dict_size != UINT32_MAX) {
+ if (coder->picky && coder->options.dict_size
+ != UINT32_MAX) {
// A hack to ditch tons of false positives:
// We allow only dictionary sizes that are
// 2^n or 2^n + 2^(n-1). LZMA_Alone created
// only files with 2^n, but accepts any
- // dictionary size. If someone complains, this
- // will be reconsidered.
+ // dictionary size.
uint32_t d = coder->options.dict_size - 1;
d |= d >> 2;
d |= d >> 3;
@@ -103,9 +108,9 @@ alone_decode(lzma_coder *coder,
// Another hack to ditch false positives: Assume that
// if the uncompressed size is known, it must be less
- // than 256 GiB. Again, if someone complains, this
- // will be reconsidered.
- if (coder->uncompressed_size != LZMA_VLI_UNKNOWN
+ // than 256 GiB.
+ if (coder->picky
+ && coder->uncompressed_size != LZMA_VLI_UNKNOWN
&& coder->uncompressed_size
>= (LZMA_VLI_C(1) << 38))
return LZMA_FORMAT_ERROR;
@@ -189,7 +194,7 @@ alone_decoder_memconfig(lzma_coder *coder, uint64_t *memusage,
extern lzma_ret
lzma_alone_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
- uint64_t memlimit)
+ uint64_t memlimit, bool picky)
{
lzma_next_coder_init(&lzma_alone_decoder_init, next, allocator);
@@ -208,6 +213,7 @@ lzma_alone_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
}
next->coder->sequence = SEQ_PROPERTIES;
+ next->coder->picky = picky;
next->coder->pos = 0;
next->coder->options.dict_size = 0;
next->coder->options.preset_dict = NULL;
@@ -223,7 +229,7 @@ lzma_alone_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
extern LZMA_API(lzma_ret)
lzma_alone_decoder(lzma_stream *strm, uint64_t memlimit)
{
- lzma_next_strm_init(lzma_alone_decoder_init, strm, memlimit);
+ lzma_next_strm_init(lzma_alone_decoder_init, strm, memlimit, false);
strm->internal->supported_actions[LZMA_RUN] = true;
strm->internal->supported_actions[LZMA_FINISH] = true;
diff --git a/src/liblzma/common/alone_decoder.h b/src/liblzma/common/alone_decoder.h
index 70d0d2a0..f666fc38 100644
--- a/src/liblzma/common/alone_decoder.h
+++ b/src/liblzma/common/alone_decoder.h
@@ -16,7 +16,8 @@
#include "common.h"
-extern lzma_ret lzma_alone_decoder_init(lzma_next_coder *next,
- lzma_allocator *allocator, uint64_t memlimit);
+extern lzma_ret lzma_alone_decoder_init(
+ lzma_next_coder *next, lzma_allocator *allocator,
+ uint64_t memlimit, bool picky);
#endif
diff --git a/src/liblzma/common/auto_decoder.c b/src/liblzma/common/auto_decoder.c
index ae6c3e78..35c895fd 100644
--- a/src/liblzma/common/auto_decoder.c
+++ b/src/liblzma/common/auto_decoder.c
@@ -54,7 +54,7 @@ auto_decode(lzma_coder *coder, lzma_allocator *allocator,
coder->memlimit, coder->flags));
} else {
return_if_error(lzma_alone_decoder_init(&coder->next,
- allocator, coder->memlimit));
+ allocator, coder->memlimit, true));
// If the application wants to know about missing
// integrity check or about the check in general, we