361 lines
8.7 KiB
C++
361 lines
8.7 KiB
C++
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/*
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* YOUR INFO HERE!
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*/
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// TOP
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typedef unsigned int Fixed16_16;
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struct Offset_Table{
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Fixed16_16 version;
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unsigned short num_tables;
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unsigned short search_range;
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unsigned short entry_selector;
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unsigned short range_shift;
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};
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struct Table_Directory_Entry{
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unsigned long tag;
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unsigned long check_sum;
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unsigned long offset;
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unsigned long length;
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};
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#include <stdio.h>
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#include <stdlib.h>
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struct Data{
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char *data;
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int size;
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};
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Data
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open_file(const char *filename){
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Data result = {};
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FILE *file;
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file = fopen(filename, "rb");
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if (file){
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fseek(file, 0, SEEK_END);
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result.size = ftell(file);
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fseek(file, 0, SEEK_SET);
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if (result.size > 0){
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result.data = (char*)malloc(result.size);
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fread(result.data, result.size, 1, file);
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}
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fclose(file);
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}
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return(result);
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}
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void
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print(Offset_Table *offset){
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printf("version %d\n", offset->version >> 16);
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printf("number of tables %d\n", (int)(offset->num_tables));
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printf("search range %d\n", (int)(offset->search_range));
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printf("entry selector %d\n", (int)(offset->entry_selector));
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printf("range shift %d\n", (int)(offset->range_shift));
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}
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void
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print(Table_Directory_Entry *entry){
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printf("tag %.4s\n", &entry->tag);
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printf("check sum %08x\n", entry->check_sum);
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printf("offset %d\n", entry->offset);
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printf("length %d\n", entry->length);
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}
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void
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byte_reverse(void *ptr, int len){
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char *c;
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int i,j;
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char t;
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c = (char*)ptr;
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for (i = 0, j = len-1; i < j; ++i, --j){
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t = c[i];
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c[i] = c[j];
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c[j] = t;
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}
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}
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void
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byte_fix(Offset_Table *offset){
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byte_reverse(&offset->version, 4);
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byte_reverse(&offset->num_tables, 2);
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byte_reverse(&offset->search_range, 2);
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byte_reverse(&offset->entry_selector, 2);
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byte_reverse(&offset->range_shift, 2);
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}
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void
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byte_fix(Table_Directory_Entry *entry){
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byte_reverse(&entry->check_sum, 4);
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byte_reverse(&entry->offset, 4);
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byte_reverse(&entry->length, 4);
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}
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struct cmap_Header{
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unsigned short version;
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unsigned short num_subtables;
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};
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struct cmap_Subtable_Entry{
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unsigned short plat_id;
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unsigned short plat_encoding_id;
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unsigned long offset_from_cmap;
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};
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void
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byte_fix(cmap_Header *header){
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byte_reverse(&header->version, 2);
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byte_reverse(&header->num_subtables, 2);
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}
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void
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print(cmap_Header *header){
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printf("cmap tables:\n");
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printf("\tversion %d\n", (int)(header->version));
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printf("\tsubtables %d\n", (int)(header->num_subtables));
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}
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void
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byte_fix(cmap_Subtable_Entry *entry){
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byte_reverse(&entry->plat_id, 2);
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byte_reverse(&entry->plat_encoding_id, 2);
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byte_reverse(&entry->offset_from_cmap, 4);
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}
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struct cmap_Subtable_Format4_Header{
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unsigned short format;
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unsigned short length;
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unsigned short version;
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unsigned short segment_count_2;
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unsigned short search_range;
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unsigned short entry_selector;
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unsigned short range_shift;
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};
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void
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print(cmap_Subtable_Entry *entry){
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printf("\tplatform id %d\n", (int)(entry->plat_id));
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printf("\tencoding id %d\n", (int)(entry->plat_encoding_id));
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printf("\toffset from cmap %d\n", (int)(entry->offset_from_cmap));
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}
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void
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byte_fix(cmap_Subtable_Format4_Header *header){
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byte_reverse(&header->length, 2);
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byte_reverse(&header->version, 2);
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byte_reverse(&header->segment_count_2, 2);
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byte_reverse(&header->search_range, 2);
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byte_reverse(&header->entry_selector, 2);
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byte_reverse(&header->range_shift, 2);
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}
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void
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print(cmap_Subtable_Format4_Header *header){
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printf("\t\tlength %d\n", header->length);
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printf("\t\tversion %d\n", header->version);
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printf("\t\tsegment count doubled %d\n", header->segment_count_2);
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printf("\t\tsearch range %d\n", header->search_range);
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printf("\t\tentry selector %d\n", header->entry_selector);
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printf("\t\trange shift %d\n", header->range_shift);
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}
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struct cmap_Subtable_Format4_Segments{
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unsigned short *end_code, *start_code;
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unsigned short *id_delta, *id_range_offset;
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};
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void
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byte_fix(cmap_Subtable_Format4_Segments segs, int segment_count){
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for (int i = 0; i < segment_count; ++i){
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byte_reverse(segs.end_code + i, 2);
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}
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for (int i = 0; i < segment_count; ++i){
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byte_reverse(segs.start_code + i, 2);
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}
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for (int i = 0; i < segment_count; ++i){
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byte_reverse(segs.id_delta + i, 2);
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}
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for (int i = 0; i < segment_count; ++i){
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byte_reverse(segs.id_range_offset + i, 2);
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}
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}
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void
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print(cmap_Subtable_Format4_Segments segs, int i){
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printf("\t\tsegment %d\n", i);
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printf("\t\tend code %d\n", (int)(segs.end_code[i]));
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printf("\t\tstart code %d\n", (int)(segs.start_code[i]));
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printf("\t\tid delta %d\n", (int)(segs.id_delta[i]));
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printf("\t\tid range offset %d\n", (int)(segs.id_range_offset[i]));
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}
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void
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parse_cmap_subtable4(char *start){
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char *cursor = start;
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cmap_Subtable_Format4_Header *header =
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(cmap_Subtable_Format4_Header*)cursor;
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cursor = (char*)(header + 1);
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byte_fix(header);
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print(header);
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int segment_count = (header->segment_count_2 >> 1);
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cmap_Subtable_Format4_Segments segs;
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segs.end_code = (unsigned short*)cursor;
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cursor = (char*)(segs.end_code + segment_count);
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cursor = cursor + sizeof(unsigned short);
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segs.start_code = (unsigned short*)cursor;
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cursor = (char*)(segs.start_code + segment_count);
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segs.id_delta = (unsigned short*)cursor;
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cursor = (char*)(segs.id_delta + segment_count);
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segs.id_range_offset = (unsigned short*)cursor;
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cursor = (char*)(segs.id_range_offset + segment_count);
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byte_fix(segs, segment_count);
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for (int i = 0; i < segment_count; ++i){
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printf("\n");
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print(segs, i);
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}
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}
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void
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parse_cmap_subtable(char *start){
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char *cursor = start;
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short *format = (short*)cursor;
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byte_reverse(format, 2);
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printf("\t\tformat %d\n", (int)(*format));
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switch (*format){
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case 4:
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parse_cmap_subtable4(start);
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break;
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}
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}
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void
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parse_cmap(char *start){
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char *cursor = start;
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cmap_Header *header = (cmap_Header*)cursor;
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cursor = (char*)(header + 1);
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byte_fix(header);
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print(header);
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cmap_Subtable_Entry *entry = (cmap_Subtable_Entry*)cursor;
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for (int i = 0; i < header->num_subtables; ++i, ++entry){
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byte_fix(entry);
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printf("\n");
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print(entry);
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if (entry->plat_id == 3 && entry->plat_encoding_id == 1){
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printf("\n\tMicrosoft Unicode table:\n");
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parse_cmap_subtable(start + entry->offset_from_cmap);
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}
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}
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}
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struct glyf_Glyph_Header{
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short num_contours;
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short x_min;
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short x_max;
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short y_min;
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short y_max;
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};
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void
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byte_fix(glyf_Glyph_Header *header){
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byte_reverse(&header->num_contours, 2);
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byte_reverse(&header->x_min, 2);
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byte_reverse(&header->x_max, 2);
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byte_reverse(&header->y_min, 2);
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byte_reverse(&header->y_max, 2);
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}
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void
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print(glyf_Glyph_Header *header){
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printf("\tcontours %d\n", (int)(header->num_contours));
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printf("\tx min %d\n", (int)(header->x_min));
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printf("\tx max %d\n", (int)(header->x_max));
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printf("\ty min %d\n", (int)(header->y_min));
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printf("\ty max %d\n", (int)(header->y_max));
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}
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void
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parse_glyf(char *start){
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char *cursor = start;
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glyf_Glyph_Header *header = (glyf_Glyph_Header*)cursor;
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cursor = (char*)(header + 1);
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byte_fix(header);
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print(header);
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}
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#define TTF_Tag(a,b,c,d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24))
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#define TTF_Tag_cmap TTF_Tag('c', 'm', 'a', 'p')
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#define TTF_Tag_glyf TTF_Tag('g', 'l', 'y', 'f')
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#define TTF_Tag_fpgm TTF_Tag('f', 'p', 'g', 'm')
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#define TTF_Tag_prep TTF_Tag('p', 'r', 'e', 'p')
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#define TTF_Tag_cvt TTF_Tag('c', 'v', 't', ' ')
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#define TTF_Tag_maxp TTF_Tag('m', 'a', 'x', 'p')
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int
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main(){
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Data file;
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char *filename;
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filename = "test.ttf";
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file = open_file(filename);
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if (file.data == 0){
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printf("could not open %s\n", filename);
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return (1);
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}
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char *cursor;
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Offset_Table *offset;
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cursor = file.data;
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offset = (Offset_Table*)cursor;
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cursor = (char*)(offset + 1);
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Table_Directory_Entry *directory_entries = (Table_Directory_Entry*)cursor;
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byte_fix(offset);
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print(offset);
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int table_number = offset->num_tables;
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Table_Directory_Entry *entry = directory_entries;
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for (int i = 0; i < table_number; ++i, ++entry){
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printf("\n");
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byte_fix(entry);
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print(entry);
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switch (entry->tag){
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case TTF_Tag_cmap:
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parse_cmap(file.data + entry->offset);
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break;
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case TTF_Tag_glyf:
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parse_glyf(file.data + entry->offset);
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break;
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}
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}
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return (0);
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}
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// BOTTOM
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