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clean up & merge inline binary annotation decoders

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This commit is contained in:
Ryan Fleury
2024-05-26 14:56:13 -07:00
parent ffa802f583
commit 729a5a9392
2 changed files with 49 additions and 41 deletions
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src/codeview/codeview.c
+42 -35
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@@ -171,44 +171,51 @@ cv_f64_from_numeric(CV_NumericParsed *num){
internal U64
cv_decode_inline_annot_u32(String8 data, U64 offset, U32 *out_value)
{
U32 value;
U64 cursor = offset;
// rjf: read header
U8 header = 0;
cursor += str8_deserial_read_struct(data, cursor, &header);
// 1 byte
if((header & 0x80) == 0)
// rjf: decode value
U32 value = 0;
{
value = header;
// 1 byte
if((header & 0x80) == 0)
{
value = header;
}
// 2 bytes
else if((header & 0xC0) == 0x80 && cursor+2 <= data.size)
{
U8 second_byte;
cursor += str8_deserial_read_struct(data, cursor, &second_byte);
value = ((header & 0x3F) << 8) | second_byte;
}
// 4 bytes
else if((header & 0xE0) == 0xC0 && cursor+3 <= data.size)
{
U8 second_byte, third_byte, fourth_byte;
cursor += str8_deserial_read_struct(data, cursor, &second_byte);
cursor += str8_deserial_read_struct(data, cursor, &third_byte);
cursor += str8_deserial_read_struct(data, cursor, &fourth_byte);
value = (((U32)header & 0x1F) << 24) | ((U32)second_byte << 16) | ((U32)third_byte << 8) | (U32)fourth_byte;
}
// bad encode
else if((header & 0xE0) == 0xE0)
{
value = max_U32;
}
}
// 2 bytes
else if((header & 0xC0) == 0x80)
// rjf: output results
if(out_value)
{
Assert(cursor + sizeof(U8) * 2 <= data.size);
U8 second_byte;
cursor += str8_deserial_read_struct(data, cursor, &second_byte);
value = ((header & 0x3F) << 8) | second_byte;
*out_value = value;
}
// 4 bytes
else if((header & 0xE0) == 0xC0)
{
Assert(cursor + sizeof(U8) * 3 <= data.size);
U8 second_byte, third_byte, fourth_byte;
cursor += str8_deserial_read_struct(data, cursor, &second_byte);
cursor += str8_deserial_read_struct(data, cursor, &third_byte);
cursor += str8_deserial_read_struct(data, cursor, &fourth_byte);
value = (((U32)header & 0x1F) << 24) | ((U32)second_byte << 16) | ((U32)third_byte << 8) | (U32)fourth_byte;
}
// bad encode
else if((header & 0xE0) == 0xE0)
{
value = max_U32;
}
*out_value = value;
U64 read_size = cursor - offset;
return read_size;
}
@@ -217,9 +224,9 @@ internal U64
cv_decode_inline_annot_s32(String8 data, U64 offset, S32 *out_value)
{
U32 value;
U64 read_size = cv_decode_inline_annot_u32(data, offset, &value);
if(value & 1)
{
value = -(value >> 1);
@@ -228,9 +235,9 @@ cv_decode_inline_annot_s32(String8 data, U64 offset, S32 *out_value)
{
value = value >> 1;
}
*out_value = (S32)value;
return read_size;
}