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minimize use of assert: removed or changed to error handling (#1467)

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This commit is contained in:
Michiharu Ariza 2018-12-11 12:20:20 -08:00 committed by Behdad Esfahbod
parent f24498c1e9
commit 333586245c
6 changed files with 41 additions and 16 deletions
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2
src/hb-ot-cff-common.hh
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@ -51,7 +51,7 @@ inline unsigned int calcOffSize(unsigned int dataSize)
size++;
offset >>= 8;
}
assert (size <= 4);
/* format does not support size > 4; caller should handle it as an error */
return size;
}

12
src/hb-ot-cff1-table.hh
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@ -211,7 +211,8 @@ struct Encoding {
hb_codepoint_t code = code_ranges[i].code;
for (int left = (int)code_ranges[i].glyph; left >= 0; left--)
fmt0->codes[glyph++].set (code++);
assert ((glyph <= 0x100) && (code <= 0x100));
if (unlikely (!((glyph <= 0x100) && (code <= 0x100))))
return_trace (false);
}
}
else
@ -221,7 +222,8 @@ struct Encoding {
fmt1->nRanges.set (code_ranges.len);
for (unsigned int i = 0; i < code_ranges.len; i++)
{
assert ((code_ranges[i].code <= 0xFF) && (code_ranges[i].glyph <= 0xFF));
if (unlikely (!((code_ranges[i].code <= 0xFF) && (code_ranges[i].glyph <= 0xFF))))
return_trace (false);
fmt1->ranges[i].first.set (code_ranges[i].code);
fmt1->ranges[i].nLeft.set (code_ranges[i].glyph);
}
@ -490,7 +492,8 @@ struct Charset {
if (unlikely (fmt1 == nullptr)) return_trace (false);
for (unsigned int i = 0; i < sid_ranges.len; i++)
{
assert (sid_ranges[i].glyph <= 0xFF);
if (unlikely (!(sid_ranges[i].glyph <= 0xFF)))
return_trace (false);
fmt1->ranges[i].first.set (sid_ranges[i].code);
fmt1->ranges[i].nLeft.set (sid_ranges[i].glyph);
}
@ -501,7 +504,8 @@ struct Charset {
if (unlikely (fmt2 == nullptr)) return_trace (false);
for (unsigned int i = 0; i < sid_ranges.len; i++)
{
assert (sid_ranges[i].glyph <= 0xFFFF);
if (unlikely (!(sid_ranges[i].glyph <= 0xFFFF)))
return_trace (false);
fmt2->ranges[i].first.set (sid_ranges[i].code);
fmt2->ranges[i].nLeft.set (sid_ranges[i].glyph);
}

6
src/hb-subset-cff-common.cc
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@ -100,8 +100,9 @@ hb_plan_subset_cff_fdselect (const hb_vector_t<hb_codepoint_t> &glyphs,
hb_codepoint_t fd = CFF_UNDEF_CODE;
while (set->next (&fd))
fdmap.add (fd);
assert (fdmap.get_count () == subset_fd_count);
hb_set_destroy (set);
if (unlikely (fdmap.get_count () != subset_fd_count))
return false;
}
/* update each font dict index stored as "code" in fdselect_ranges */
@ -112,7 +113,8 @@ hb_plan_subset_cff_fdselect (const hb_vector_t<hb_codepoint_t> &glyphs,
/* determine which FDSelect format is most compact */
if (subset_fd_count > 0xFF)
{
assert (src.format == 4);
if (unlikely (src.format != 4))
return false;
subset_fdselect_format = 4;
subset_fdselect_size = FDSelect::min_size + FDSelect4::min_size + FDSelect4_Range::static_size * num_ranges + HBUINT32::static_size;
}

1
src/hb-subset-cff-common.hh
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@ -578,7 +578,6 @@ struct SubrRemap : Remap
inline int biased_num (unsigned int old_num) const
{
hb_codepoint_t new_num = (*this)[old_num];
assert (new_num != CFF_UNDEF_CODE);
return (int)new_num - bias;
}

16
src/hb-subset-cff1.cc
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@ -175,7 +175,8 @@ struct CFF1TopDict_OpSerializer : CFFTopDict_OpSerializer<CFF1TopDictVal>
OpStr supp_op;
supp_op.op = op;
supp_op.str.str = opstr.str.str + opstr.last_arg_offset;
assert (opstr.str.len >= opstr.last_arg_offset + 3);
if ( unlikely (!(opstr.str.len >= opstr.last_arg_offset + 3)))
return_trace (false);
supp_op.str.len = opstr.str.len - opstr.last_arg_offset;
return_trace (UnsizedByteStr::serialize_int2 (c, mod.nameSIDs[NameDictValues::registry]) &&
UnsizedByteStr::serialize_int2 (c, mod.nameSIDs[NameDictValues::ordering]) &&
@ -644,6 +645,8 @@ struct cff_subset_plan {
CFF1TopDict_OpSerializer topSzr;
unsigned int topDictSize = TopDict::calculate_serialized_size (topdict_mod, topSzr);
offsets.topDictInfo.offSize = calcOffSize(topDictSize);
if (unlikely (offsets.topDictInfo.offSize > 4))
return false;
final_size += CFF1IndexOf<TopDict>::calculate_serialized_size<CFF1TopDictValuesMod>
(offsets.topDictInfo.offSize,
&topdict_mod, 1, topdict_sizes, topSzr);
@ -670,7 +673,8 @@ struct cff_subset_plan {
/* SIDs for name strings in dicts are added before glyph names so they fit in 16-bit int range */
if (unlikely (!collect_sids_in_dicts (acc)))
return false;
assert (sidmap.get_count () <= 0x8000);
if (unlikely (sidmap.get_count () > 0x8000)) /* assumption: a dict won't reference that many strings */
return false;
if (subset_charset)
offsets.charsetInfo.size = plan_subset_charset (acc, plan);
@ -711,6 +715,8 @@ struct cff_subset_plan {
/* global subrs */
unsigned int dataSize = subset_globalsubrs.total_size ();
offsets.globalSubrsInfo.offSize = calcOffSize (dataSize);
if (unlikely (offsets.globalSubrsInfo.offSize > 4))
return false;
offsets.globalSubrsInfo.size = CFF1Subrs::calculate_serialized_size (offsets.globalSubrsInfo.offSize, subset_globalsubrs.len, dataSize);
/* local subrs */
@ -732,6 +738,8 @@ struct cff_subset_plan {
{
offsets.localSubrsInfos[fd].offset = final_size;
offsets.localSubrsInfos[fd].offSize = calcOffSize (dataSize);
if (unlikely (offsets.localSubrsInfos[fd].offSize > 4))
return false;
offsets.localSubrsInfos[fd].size = CFF1Subrs::calculate_serialized_size (offsets.localSubrsInfos[fd].offSize, subset_localsubrs[fd].len, dataSize);
}
}
@ -775,6 +783,8 @@ struct cff_subset_plan {
dictsSize += FontDict::calculate_serialized_size (acc.fontDicts[i], fontSzr);
offsets.FDArrayInfo.offSize = calcOffSize (dictsSize);
if (unlikely (offsets.FDArrayInfo.offSize > 4))
return false;
final_size += CFF1Index::calculate_serialized_size (offsets.FDArrayInfo.offSize, subset_fdcount, dictsSize);
}
@ -783,6 +793,8 @@ struct cff_subset_plan {
offsets.charStringsInfo.offset = final_size;
unsigned int dataSize = subset_charstrings.total_size ();
offsets.charStringsInfo.offSize = calcOffSize (dataSize);
if (unlikely (offsets.charStringsInfo.offSize > 4))
return false;
final_size += CFF1CharStrings::calculate_serialized_size (offsets.charStringsInfo.offSize, plan->glyphs.len, dataSize);
}

14
src/hb-subset-cff2.cc
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@ -112,7 +112,11 @@ struct CFF2CSOpSet_Flatten : CFF2CSOpSet<CFF2CSOpSet_Flatten, FlattenParam>
const BlendArg &arg = env.argStack[i];
if (arg.blending ())
{
assert ((arg.numValues > 0) && (env.argStack.get_count () >= arg.numValues));
if (unlikely (!((arg.numValues > 0) && (env.argStack.get_count () >= arg.numValues))))
{
env.set_error ();
return;
}
flatten_blends (arg, i, env, param);
i += arg.numValues;
}
@ -133,8 +137,12 @@ struct CFF2CSOpSet_Flatten : CFF2CSOpSet<CFF2CSOpSet_Flatten, FlattenParam>
for (unsigned int j = 0; j < arg.numValues; j++)
{
const BlendArg &arg1 = env.argStack[i + j];
assert (arg1.blending () && (arg.numValues == arg1.numValues) && (arg1.valueIndex == j) &&
(arg1.deltas.len == env.get_region_count ()));
if (unlikely (!((arg1.blending () && (arg.numValues == arg1.numValues) && (arg1.valueIndex == j) &&
(arg1.deltas.len == env.get_region_count ())))))
{
env.set_error ();
return;
}
encoder.encode_num (arg1);
}
/* flatten deltas for each value */