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-rw-r--r--lib/common/comp_lzo.c42
1 files changed, 35 insertions, 7 deletions
diff --git a/lib/common/comp_lzo.c b/lib/common/comp_lzo.c
index cf5a362..f371fb6 100644
--- a/lib/common/comp_lzo.c
+++ b/lib/common/comp_lzo.c
@@ -13,6 +13,8 @@
#include <lzo/lzo1x.h>
+#define LZO_MAX_SIZE(size) (size + (size / 16) + 64 + 3)
+
#define LZO_NUM_ALGS (sizeof(lzo_algs) / sizeof(lzo_algs[0]))
typedef int (*lzo_cb_t)(const lzo_bytep src, lzo_uint src_len, lzo_bytep dst,
@@ -49,6 +51,9 @@ typedef struct {
int algorithm;
int level;
+ size_t buf_size;
+ size_t work_size;
+
sqfs_u8 buffer[];
} lzo_compressor_t;
@@ -128,27 +133,33 @@ static sqfs_s32 lzo_comp_block(sqfs_compressor_t *base, const sqfs_u8 *in,
sqfs_u32 size, sqfs_u8 *out, sqfs_u32 outsize)
{
lzo_compressor_t *lzo = (lzo_compressor_t *)base;
- lzo_uint len = outsize;
+ void *scratch;
+ lzo_uint len;
int ret;
if (size >= 0x7FFFFFFF)
return 0;
+ scratch = lzo->buffer + lzo->work_size;
+ len = lzo->buf_size - lzo->work_size;
+
if (lzo->algorithm == SQFS_LZO1X_999 &&
lzo->level != SQFS_LZO_DEFAULT_LEVEL) {
- ret = lzo1x_999_compress_level(in, size, out, &len,
+ ret = lzo1x_999_compress_level(in, size, scratch, &len,
lzo->buffer, NULL, 0, 0,
lzo->level);
} else {
- ret = lzo_algs[lzo->algorithm].compress(in, size, out,
+ ret = lzo_algs[lzo->algorithm].compress(in, size, scratch,
&len, lzo->buffer);
}
if (ret != LZO_E_OK)
return SQFS_ERROR_COMPRESSOR;
- if (len < size)
+ if (len < size && len <= outsize) {
+ memcpy(out, scratch, len);
return len;
+ }
return 0;
}
@@ -176,7 +187,7 @@ static sqfs_compressor_t *lzo_create_copy(sqfs_compressor_t *cmp)
lzo_compressor_t *other = (lzo_compressor_t *)cmp;
lzo_compressor_t *lzo;
- lzo = calloc(1, sizeof(*lzo) + lzo_algs[other->algorithm].bufsize);
+ lzo = calloc(1, sizeof(*lzo) + other->buf_size);
if (lzo == NULL)
return NULL;
@@ -193,6 +204,7 @@ sqfs_compressor_t *lzo_compressor_create(const sqfs_compressor_config_t *cfg)
{
sqfs_compressor_t *base;
lzo_compressor_t *lzo;
+ size_t scratch_size;
if (cfg->flags & ~SQFS_COMP_FLAG_GENERIC_ALL)
return NULL;
@@ -209,8 +221,22 @@ sqfs_compressor_t *lzo_compressor_create(const sqfs_compressor_config_t *cfg)
return NULL;
}
- lzo = calloc(1,
- sizeof(*lzo) + lzo_algs[cfg->opt.lzo.algorithm].bufsize);
+ /* XXX: liblzo does not do bounds checking internally,
+ we need our own internal scratch buffer at worst case size... */
+ if (cfg->flags & SQFS_COMP_FLAG_UNCOMPRESS) {
+ scratch_size = 0;
+ } else {
+ scratch_size = cfg->block_size;
+ if (scratch_size < SQFS_META_BLOCK_SIZE)
+ scratch_size = SQFS_META_BLOCK_SIZE;
+
+ scratch_size = LZO_MAX_SIZE(scratch_size);
+ }
+
+ /* ...in addition to the LZO work space buffer of course */
+ scratch_size += lzo_algs[cfg->opt.lzo.algorithm].bufsize;
+
+ lzo = calloc(1, sizeof(*lzo) + scratch_size);
base = (sqfs_compressor_t *)lzo;
if (lzo == NULL)
@@ -218,6 +244,8 @@ sqfs_compressor_t *lzo_compressor_create(const sqfs_compressor_config_t *cfg)
lzo->algorithm = cfg->opt.lzo.algorithm;
lzo->level = cfg->opt.lzo.level;
+ lzo->buf_size = scratch_size;
+ lzo->work_size = lzo_algs[cfg->opt.lzo.algorithm].bufsize;
base->destroy = lzo_destroy;
base->do_block = (cfg->flags & SQFS_COMP_FLAG_UNCOMPRESS) ?