diff options
Diffstat (limited to 'lib/zlib_inflate/inflate.c')
| -rw-r--r-- | lib/zlib_inflate/inflate.c | 56 |
1 files changed, 36 insertions, 20 deletions
diff --git a/lib/zlib_inflate/inflate.c b/lib/zlib_inflate/inflate.c index 48f14cd58c77..d1efad69f02b 100644 --- a/lib/zlib_inflate/inflate.c +++ b/lib/zlib_inflate/inflate.c @@ -15,6 +15,16 @@ #include "inffast.h" #include "infutil.h" +/* architecture-specific bits */ +#ifdef CONFIG_ZLIB_DFLTCC +# include "../zlib_dfltcc/dfltcc_inflate.h" +#else +#define INFLATE_RESET_HOOK(strm) do {} while (0) +#define INFLATE_TYPEDO_HOOK(strm, flush) do {} while (0) +#define INFLATE_NEED_UPDATEWINDOW(strm) 1 +#define INFLATE_NEED_CHECKSUM(strm) 1 +#endif + int zlib_inflate_workspacesize(void) { return sizeof(struct inflate_workspace); @@ -42,6 +52,7 @@ int zlib_inflateReset(z_streamp strm) state->write = 0; state->whave = 0; + INFLATE_RESET_HOOK(strm); return Z_OK; } @@ -66,7 +77,15 @@ int zlib_inflateInit2(z_streamp strm, int windowBits) return Z_STREAM_ERROR; } state->wbits = (unsigned)windowBits; +#ifdef CONFIG_ZLIB_DFLTCC + /* + * DFLTCC requires the window to be page aligned. + * Thus, we overallocate and take the aligned portion of the buffer. + */ + state->window = PTR_ALIGN(&WS(strm)->working_window[0], PAGE_SIZE); +#else state->window = &WS(strm)->working_window[0]; +#endif return zlib_inflateReset(strm); } @@ -227,11 +246,6 @@ static int zlib_inflateSyncPacket(z_streamp strm) bits -= bits & 7; \ } while (0) -/* Reverse the bytes in a 32-bit value */ -#define REVERSE(q) \ - ((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \ - (((q) & 0xff00) << 8) + (((q) & 0xff) << 24)) - /* inflate() uses a state machine to process as much input data and generate as much output data as possible before returning. The state machine is @@ -382,7 +396,7 @@ int zlib_inflate(z_streamp strm, int flush) strm->adler = state->check = REVERSE(hold); INITBITS(); state->mode = DICT; - /* fall through */ + fallthrough; case DICT: if (state->havedict == 0) { RESTORE(); @@ -390,11 +404,12 @@ int zlib_inflate(z_streamp strm, int flush) } strm->adler = state->check = zlib_adler32(0L, NULL, 0); state->mode = TYPE; - /* fall through */ + fallthrough; case TYPE: if (flush == Z_BLOCK) goto inf_leave; - /* fall through */ + fallthrough; case TYPEDO: + INFLATE_TYPEDO_HOOK(strm, flush); if (state->last) { BYTEBITS(); state->mode = CHECK; @@ -431,7 +446,7 @@ int zlib_inflate(z_streamp strm, int flush) state->length = (unsigned)hold & 0xffff; INITBITS(); state->mode = COPY; - /* fall through */ + fallthrough; case COPY: copy = state->length; if (copy) { @@ -465,7 +480,7 @@ int zlib_inflate(z_streamp strm, int flush) #endif state->have = 0; state->mode = LENLENS; - /* fall through */ + fallthrough; case LENLENS: while (state->have < state->ncode) { NEEDBITS(3); @@ -486,7 +501,7 @@ int zlib_inflate(z_streamp strm, int flush) } state->have = 0; state->mode = CODELENS; - /* fall through */ + fallthrough; case CODELENS: while (state->have < state->nlen + state->ndist) { for (;;) { @@ -560,7 +575,7 @@ int zlib_inflate(z_streamp strm, int flush) break; } state->mode = LEN; - /* fall through */ + fallthrough; case LEN: if (have >= 6 && left >= 258) { RESTORE(); @@ -600,7 +615,7 @@ int zlib_inflate(z_streamp strm, int flush) } state->extra = (unsigned)(this.op) & 15; state->mode = LENEXT; - /* fall through */ + fallthrough; case LENEXT: if (state->extra) { NEEDBITS(state->extra); @@ -608,7 +623,7 @@ int zlib_inflate(z_streamp strm, int flush) DROPBITS(state->extra); } state->mode = DIST; - /* fall through */ + fallthrough; case DIST: for (;;) { this = state->distcode[BITS(state->distbits)]; @@ -634,7 +649,7 @@ int zlib_inflate(z_streamp strm, int flush) state->offset = (unsigned)this.val; state->extra = (unsigned)(this.op) & 15; state->mode = DISTEXT; - /* fall through */ + fallthrough; case DISTEXT: if (state->extra) { NEEDBITS(state->extra); @@ -654,7 +669,7 @@ int zlib_inflate(z_streamp strm, int flush) break; } state->mode = MATCH; - /* fall through */ + fallthrough; case MATCH: if (left == 0) goto inf_leave; copy = out - left; @@ -692,7 +707,7 @@ int zlib_inflate(z_streamp strm, int flush) out -= left; strm->total_out += out; state->total += out; - if (out) + if (INFLATE_NEED_CHECKSUM(strm) && out) strm->adler = state->check = UPDATE(state->check, put - out, out); out = left; @@ -705,7 +720,7 @@ int zlib_inflate(z_streamp strm, int flush) INITBITS(); } state->mode = DONE; - /* fall through */ + fallthrough; case DONE: ret = Z_STREAM_END; goto inf_leave; @@ -726,7 +741,8 @@ int zlib_inflate(z_streamp strm, int flush) */ inf_leave: RESTORE(); - if (state->wsize || (state->mode < CHECK && out != strm->avail_out)) + if (INFLATE_NEED_UPDATEWINDOW(strm) && + (state->wsize || (state->mode < CHECK && out != strm->avail_out))) zlib_updatewindow(strm, out); in -= strm->avail_in; @@ -734,7 +750,7 @@ int zlib_inflate(z_streamp strm, int flush) strm->total_in += in; strm->total_out += out; state->total += out; - if (state->wrap && out) + if (INFLATE_NEED_CHECKSUM(strm) && state->wrap && out) strm->adler = state->check = UPDATE(state->check, strm->next_out - out, out); |