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authorDenis Vlasenko2007-01-05 14:04:47 +0000
committerDenis Vlasenko2007-01-05 14:04:47 +0000
commit3376298b59abea4ec3c69fe1dbe5898db260cc5a (patch)
treea831c13cfb8e839ddf5d020a879d3e4d8c0376f8
parent98b8e9487dc40100d8031136f2241a66ce9dffb0 (diff)
downloadbusybox-3376298b59abea4ec3c69fe1dbe5898db260cc5a.zip
busybox-3376298b59abea4ec3c69fe1dbe5898db260cc5a.tar.gz
Stop tracking buffer size - it is a constant.
Stop ignoring write errors. Fix bugs in this line: rc->buffer_size = read(rc->fd, RC_BUFFER, rc->buffer_size); (a) should use safe_read() (b) just ONE short read (e.g. 4 bytes) will make ALL future reads short!
-rw-r--r--archival/libunarchive/decompress_unlzma.c59
1 files changed, 34 insertions, 25 deletions
diff --git a/archival/libunarchive/decompress_unlzma.c b/archival/libunarchive/decompress_unlzma.c
index c1b0a31..15a0275 100644
--- a/archival/libunarchive/decompress_unlzma.c
+++ b/archival/libunarchive/decompress_unlzma.c
@@ -22,17 +22,23 @@
typedef struct {
int fd;
uint8_t *ptr;
-// uint8_t *buffer;
+
+/* Was keeping rc on stack in unlzma and separately allocating buffer,
+ * but with "buffer 'attached to' allocated rc" code is smaller: */
+ /* uint8_t *buffer; */
+#define RC_BUFFER ((uint8_t*)(rc+1))
+
uint8_t *buffer_end;
- int buffer_size;
+
+/* Had provisions for variable buffer, but we don't need it here */
+ /* int buffer_size; */
+#define RC_BUFFER_SIZE 0x10000
+
uint32_t code;
uint32_t range;
uint32_t bound;
} rc_t;
-//#define RC_BUFFER ((uint8_t*)(void*)(rc+1))
-#define RC_BUFFER ((uint8_t*)(rc+1))
-
#define RC_TOP_BITS 24
#define RC_MOVE_BITS 5
#define RC_MODEL_TOTAL_BITS 11
@@ -41,24 +47,24 @@ typedef struct {
/* Called twice: once at startup and once in rc_normalize() */
static void rc_read(rc_t * rc)
{
- rc->buffer_size = read(rc->fd, RC_BUFFER, rc->buffer_size);
- if (rc->buffer_size <= 0)
+ int buffer_size = safe_read(rc->fd, RC_BUFFER, RC_BUFFER_SIZE);
+ if (buffer_size <= 0)
bb_error_msg_and_die("unexpected EOF");
rc->ptr = RC_BUFFER;
- rc->buffer_end = RC_BUFFER + rc->buffer_size;
+ rc->buffer_end = RC_BUFFER + buffer_size;
}
/* Called once */
-static rc_t* rc_init(int fd, int buffer_size)
+static rc_t* rc_init(int fd) /*, int buffer_size) */
{
int i;
rc_t* rc;
- rc = xmalloc(sizeof(rc_t) + buffer_size);
+ rc = xmalloc(sizeof(rc_t) + RC_BUFFER_SIZE);
rc->fd = fd;
- rc->buffer_size = buffer_size;
- rc->buffer_end = RC_BUFFER + rc->buffer_size;
+ /* rc->buffer_size = buffer_size; */
+ rc->buffer_end = RC_BUFFER + RC_BUFFER_SIZE;
rc->ptr = rc->buffer_end;
rc->code = 0;
@@ -168,7 +174,7 @@ typedef struct {
} __attribute__ ((packed)) lzma_header_t;
-/* #defines will make compiler to compute/optimize each one with each usage.
+/* #defines will force compiler to compute/optimize each one with each usage.
* Have heart and use enum instead. */
enum {
LZMA_BASE_SIZE = 1846,
@@ -244,8 +250,7 @@ unlzma(int src_fd, int dst_fd)
int state = 0;
uint32_t rep0 = 1, rep1 = 1, rep2 = 1, rep3 = 1;
- if (read(src_fd, &header, sizeof(header)) != sizeof(header))
- bb_error_msg_and_die("can't read header");
+ xread(src_fd, &header, sizeof(header));
if (header.pos >= (9 * 5 * 5))
bb_error_msg_and_die("bad header");
@@ -270,7 +275,7 @@ unlzma(int src_fd, int dst_fd)
for (i = 0; i < num_probs; i++)
p[i] = (1 << RC_MODEL_TOTAL_BITS) >> 1;
- rc = rc_init(src_fd, 0x10000);
+ rc = rc_init(src_fd); /*, RC_BUFFER_SIZE); */
while (global_pos + buffer_pos < header.dst_size) {
int pos_state = (buffer_pos + global_pos) & pos_state_mask;
@@ -316,8 +321,8 @@ unlzma(int src_fd, int dst_fd)
if (buffer_pos == header.dict_size) {
buffer_pos = 0;
global_pos += header.dict_size;
- // FIXME: error check
- write(dst_fd, buffer, header.dict_size);
+ if (full_write(dst_fd, buffer, header.dict_size) != header.dict_size)
+ goto bad;
USE_DESKTOP(total_written += header.dict_size;)
}
if (state < 4)
@@ -358,8 +363,8 @@ unlzma(int src_fd, int dst_fd)
if (buffer_pos == header.dict_size) {
buffer_pos = 0;
global_pos += header.dict_size;
- // FIXME: error check
- write(dst_fd, buffer, header.dict_size);
+ if (full_write(dst_fd, buffer, header.dict_size) != header.dict_size)
+ goto bad;
USE_DESKTOP(total_written += header.dict_size;)
}
continue;
@@ -471,8 +476,8 @@ unlzma(int src_fd, int dst_fd)
if (buffer_pos == header.dict_size) {
buffer_pos = 0;
global_pos += header.dict_size;
- // FIXME: error check
- write(dst_fd, buffer, header.dict_size);
+ if (full_write(dst_fd, buffer, header.dict_size) != header.dict_size)
+ goto bad;
USE_DESKTOP(total_written += header.dict_size;)
}
len--;
@@ -480,9 +485,13 @@ unlzma(int src_fd, int dst_fd)
}
}
- // FIXME: error check
- write(dst_fd, buffer, buffer_pos);
- USE_DESKTOP(total_written += buffer_pos;)
+
+ if (full_write(dst_fd, buffer, buffer_pos) != buffer_pos) {
+ bad:
+ rc_free(rc);
+ return -1;
+ }
rc_free(rc);
+ USE_DESKTOP(total_written += buffer_pos;)
return USE_DESKTOP(total_written) + 0;
}