zlib 0.71v0.71

1 files changed, 217 insertions, 0 deletions

diff --git a/infcodes.c b/infcodes.c
new file mode 100644
index 0000000..ffae26d
--- /dev/null
+++ b/infcodes.c
@@ -0,0 +1,217 @@
+/* infcodes.c -- process literals and length/distance pairs
+ * Copyright (C) 1995 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h 
+ */
+
+#include "zutil.h"
+#include "inftrees.h"
+#include "infutil.h"
+#include "infcodes.h"
+
+/* simplify the use of the inflate_huft type with some defines */
+#define base more.Base
+#define next more.Next
+#define exop word.what.Exop
+#define bits word.what.Bits
+
+/* inflate codes private state */
+struct inflate_codes_state {
+
+  /* mode */
+  enum {        /* waiting for "i:"=input, "o:"=output, "x:"=nothing */
+      START,    /* x: set up for LEN */
+      LEN,      /* i: get length/literal/eob next */
+      LENEXT,   /* i: getting length extra (have base) */
+      DIST,     /* i: get distance next */
+      DISTEXT,  /* i: getting distance extra */
+      COPY,     /* o: copying bytes in window, waiting for space */
+      LIT,      /* o: got literal, waiting for output space */
+      WASH,     /* o: got eob, possibly still output waiting */
+      END,      /* x: got eob and all data flushed */
+      BAD}      /* x: got error */
+    mode;               /* current inflate_codes mode */
+
+  /* mode dependent information */
+  uInt len;
+  union {
+    struct {
+      inflate_huft *tree;       /* pointer into tree */
+      uInt need;                /* bits needed */
+    } code;             /* if LEN or DIST, where in tree */
+    uInt lit;           /* if LIT, literal */
+    struct {
+      uInt get;                 /* bits to get for extra */
+      uInt dist;                /* distance back to copy from */
+    } copy;             /* if EXT or COPY, where and how much */
+  } sub;                /* submode */
+
+  /* mode independent information */
+  Byte lbits;           /* ltree bits decoded per branch */
+  Byte dbits;           /* dtree bits decoder per branch */
+  inflate_huft *ltree;          /* literal/length/eob tree */
+  inflate_huft *dtree;          /* distance tree */
+
+};
+
+
+struct inflate_codes_state *inflate_codes_new(bl, bd, tl, td, z)
+uInt bl, bd;
+inflate_huft *tl, *td;
+z_stream *z;
+{
+  struct inflate_codes_state *c;
+
+  if ((c = (struct inflate_codes_state *)
+       ZALLOC(z,1,sizeof(struct inflate_codes_state))) != Z_NULL)
+  {
+    c->mode = START;
+    c->lbits = (Byte)bl;
+    c->dbits = (Byte)bd;
+    c->ltree = tl;
+    c->dtree = td;
+  }
+  return c;
+}
+
+
+int inflate_codes(s, z, r)
+struct inflate_blocks_state *s;
+z_stream *z;
+int r;
+{
+  uInt j;               /* temporary storage */
+  inflate_huft *t;      /* temporary pointer */
+  int e;                /* extra bits or operation */
+  uLong b;              /* bit buffer */
+  uInt k;               /* bits in bit buffer */
+  Byte *p;              /* input data pointer */
+  uInt n;               /* bytes available there */
+  Byte *q;              /* output window write pointer */
+  uInt m;               /* bytes to end of window or read pointer */
+  Byte *f;              /* pointer to copy strings from */
+  struct inflate_codes_state *c = s->sub.codes; /* codes state */
+
+  /* copy input/output information to locals (UPDATE macro restores) */
+  LOAD
+
+  /* process input and output based on current state */
+  while (1) switch (c->mode)
+  {             /* waiting for "i:"=input, "o:"=output, "x:"=nothing */
+    case START:         /* x: set up for LEN */
+      /* %%% check for avail in and out to do fast loop %%% */
+      c->sub.code.need = c->lbits;
+      c->sub.code.tree = c->ltree;
+      c->mode = LEN;
+    case LEN:           /* i: get length/literal/eob next */
+      j = c->sub.code.need;
+      NEEDBITS(j)
+      t = c->sub.code.tree + ((uInt)b & inflate_mask[j]);
+      DUMPBITS(t->bits)
+      if ((e = (int)(t->exop)) < 0)
+      {
+        if (e == -128)          /* invalid code */
+        {
+          c->mode = BAD;
+          z->msg = "invalid huffman code";
+          r = Z_DATA_ERROR;
+          LEAVE
+        }
+        e = -e;
+        if (e & 64)             /* end of block */
+        {
+          c->mode = END;
+          break;
+        }
+        c->sub.code.need = e;
+        c->sub.code.tree = t->next;
+        break;
+      }
+      if (e & 16)               /* literal */
+      {
+        c->sub.lit = t->base;
+        c->mode = LIT;
+        break;
+      }
+      c->sub.copy.get = e;
+      c->len = t->base;
+      c->mode = LENEXT;
+    case LENEXT:        /* i: getting length extra (have base) */
+      j = c->sub.copy.get;
+      NEEDBITS(j)
+      c->len += (uInt)b & inflate_mask[j];
+      DUMPBITS(j)
+      c->sub.code.need = c->dbits;
+      c->sub.code.tree = c->dtree;
+      c->mode = DIST;
+    case DIST:          /* i: get distance next */
+      j = c->sub.code.need;
+      NEEDBITS(j)
+      t = c->sub.code.tree + ((uInt)b & inflate_mask[j]);
+      DUMPBITS(t->bits)
+      if ((e = (int)(t->exop)) < 0)
+      {
+        if (e == -128)
+        {
+          c->mode = BAD;
+          z->msg = "invalid huffman code";
+          r = Z_DATA_ERROR;
+          LEAVE
+        }
+        c->sub.code.need = -e;
+        c->sub.code.tree = t->next;
+        break;
+      }
+      c->sub.copy.dist = t->base;
+      c->sub.copy.get = e;
+      c->mode = DISTEXT;
+    case DISTEXT:       /* i: getting distance extra */
+      j = c->sub.copy.get;
+      NEEDBITS(j)
+      c->sub.copy.dist += (uInt)b & inflate_mask[j];
+      DUMPBITS(j)
+      c->mode = COPY;
+    case COPY:          /* o: copying bytes in window, waiting for space */
+      f = q - s->window < c->sub.copy.dist ?
+          s->end - (c->sub.copy.dist - (q - s->window)) :
+          q - c->sub.copy.dist;
+      while (c->len)
+      {
+        NEEDOUT
+        OUTBYTE(*f++)
+        if (f == s->end)
+          f = s->window;
+        c->len--;
+      }
+      c->mode = START;
+      break;
+    case LIT:           /* o: got literal, waiting for output space */
+      NEEDOUT
+      OUTBYTE(c->sub.lit)
+      c->mode = START;
+      break;
+    case WASH:          /* o: got eob, possibly more output */
+      FLUSH
+      if (s->read != s->write)
+        LEAVE
+      c->mode = END;
+    case END:
+      r = Z_STREAM_END;
+      LEAVE
+    case BAD:           /* x: got error */
+      r = Z_DATA_ERROR;
+      LEAVE
+    default:
+      r = Z_STREAM_ERROR;
+      LEAVE
+  }
+}
+
+
+void inflate_codes_free(c, z)
+struct inflate_codes_state *c;
+z_stream *z;
+{
+  inflate_trees_free(c->dtree, z);
+  inflate_trees_free(c->ltree, z);
+  ZFREE(z, c);
+}