diff options
Diffstat (limited to 'archival/libunarchive/unzip.c')
| -rw-r--r-- | archival/libunarchive/unzip.c | 39 |
1 files changed, 30 insertions, 9 deletions
diff --git a/archival/libunarchive/unzip.c b/archival/libunarchive/unzip.c index d8d5b77..770e414 100644 --- a/archival/libunarchive/unzip.c +++ b/archival/libunarchive/unzip.c @@ -88,8 +88,8 @@ static unsigned int gunzip_outbuf_count; /* bytes in output buffer */ /* This is used to sanify any unused bits from the bitbuffer * so they arent skipped when reading trailers (trailing headers) */ -unsigned char gunzip_in_buffer_count; -unsigned char *gunzip_in_buffer; +//unsigned char gunzip_in_buffer_count; +//unsigned char *gunzip_in_buffer; /* gunzip_window size--must be a power of two, and * at least 32K for zip's deflate method */ @@ -142,13 +142,30 @@ static const unsigned char border[] = { 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 }; +#define BYTEBUFFER_MAX 0x8000 +unsigned char *bytebuffer = NULL; +unsigned int bytebuffer_offset = 0; +unsigned int bytebuffer_size = 0; + +static void fill_bytebuffer() +{ + if (bytebuffer_offset >= bytebuffer_size) { + /* Leave the first 4 bytes empty so we can always unwind the bitbuffer + * to the front of the bytebuffer, leave 4 bytes free at end of tail + * so we can easily top up buffer in check_trailer_gzip() */ + bytebuffer_size = 4 + xread(gunzip_src_fd, &bytebuffer[4], BYTEBUFFER_MAX - 8); + bytebuffer_offset = 4; + } +} + static unsigned int fill_bitbuffer(unsigned int bitbuffer, unsigned int *current, const unsigned int required) { while (*current < required) { - bitbuffer |= ((unsigned int) xread_char(gunzip_src_fd)) << *current; + fill_bytebuffer(); + bitbuffer |= ((unsigned int) bytebuffer[bytebuffer_offset]) << *current; + bytebuffer_offset++; *current += 8; } - return(bitbuffer); } @@ -857,7 +874,10 @@ static int inflate_get_next_window(void) int ret; if (needAnotherBlock) { - if(e) { calculate_gunzip_crc(); return 0; } // Last block + if(e) { + calculate_gunzip_crc(); + return 0; + } // Last block method = inflate_block(&e); needAnotherBlock = 0; } @@ -875,6 +895,7 @@ static int inflate_get_next_window(void) return 1; // More data left } else needAnotherBlock = 1; // End of that block } + /* Doesnt get here */ } /* @@ -923,7 +944,8 @@ extern void GZ_gzReadOpen(int fd, void *unused, int nUnused) gunzip_bytes_out = 0; gunzip_src_fd = fd; - gunzip_in_buffer = malloc(8); + /* Input buffer */ + bytebuffer = xmalloc(BYTEBUFFER_MAX); /* initialize gunzip_window, bit buffer */ gunzip_bk = 0; @@ -940,12 +962,11 @@ extern void GZ_gzReadClose(void) free(gunzip_crc_table); /* Store unused bytes in a global buffer so calling applets can access it */ - gunzip_in_buffer_count = 0; if (gunzip_bk >= 8) { /* Undo too much lookahead. The next read will be byte aligned * so we can discard unused bits in the last meaningful byte. */ - gunzip_in_buffer[gunzip_in_buffer_count] = gunzip_bb & 0xff; - gunzip_in_buffer_count++; + bytebuffer_offset--; + bytebuffer[bytebuffer_offset] = gunzip_bb & 0xff; gunzip_bb >>= 8; gunzip_bk -= 8; } |