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jbig2dec: Add more references to specification.

--- a/jbig2_arith.c

+++ b/jbig2_arith.c

@@ -78,7 +78,7 @@

      * that fact for the next byte we read.

      */

-    /* Figure G.3 */

+    /* Figure F.3 */

     B = (byte)((as->next_word >> 24) & 0xFF);

     if (B == 0xFF) {

         byte B1;

@@ -165,7 +165,7 @@

     result->next_word_bytes = new_bytes;

     result->offset = new_bytes;

-    /* Figure E.20 */

+    /* Figure F.1 */

     result->C = (~(result->next_word >> 8)) & 0xFF0000;

     jbig2_arith_bytein(result);

@@ -261,7 +261,7 @@

     pqe = &jbig2_arith_Qe[index];

-    /* Figure E.15 */

+    /* Figure F.2 */

     as->A -= pqe->Qe;

     if ((as->C >> 16) < as->A) {

         if ((as->A & 0x8000) == 0) {

--- a/jbig2_arith_iaid.c

+++ b/jbig2_arith_iaid.c

@@ -72,6 +72,7 @@

 {

     Jbig2ArithCx *IAIDx = actx->IAIDx;

     int SBSYMCODELEN = actx->SBSYMCODELEN;

+    /* A.3 (1) */

     int PREV = 1;

     int D;

     int i;

--- a/jbig2_symbol_dict.c

+++ b/jbig2_symbol_dict.c

@@ -282,6 +282,7 @@

             jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number, "failed to allocate for symbol bitmap");

             goto cleanup;

         }

+        /* 6.5.5 (2) */

         if (!params->SDREFAGG) {

             SDNEWSYMWIDTHS = jbig2_new(ctx, uint32_t, params->SDNUMNEWSYMS);

             if (SDNEWSYMWIDTHS == NULL) {

@@ -347,6 +348,7 @@

     tparams.SBDSOFFSET = 0;

     tparams.SBRTEMPLATE = params->SDRTEMPLATE;

+    /* 6.5.5 (1) */

     SDNEWSYMS = jbig2_sd_new(ctx, params->SDNUMNEWSYMS);

     if (SDNEWSYMS == NULL) {

         jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number, "failed to allocate new symbols (%u)", params->SDNUMNEWSYMS);