lib/tafile.c

   1 /* tafile.c */
   2
   3 /*
   4  * Copyright (C) 2011-2015 by Werner Lemberg.
   5  *
   6  * This file is part of the ttfautohint library, and may only be used,
   7  * modified, and distributed under the terms given in `COPYING'.  By
   8  * continuing to use, modify, or distribute this file you indicate that you
   9  * have read `COPYING' and understand and accept it fully.
  10  *
  11  * The file `COPYING' mentioned in the previous paragraph is distributed
  12  * with the ttfautohint library.
  13  */
  14
  15
  16 #include "ta.h"
  17
  18
  19 #define BUF_SIZE 0x10000
  20
  21 FT_Error
  22 TA_font_file_read(FONT* font,
  23                   FILE* in_file)
  24 {
  25   FT_Byte buf[BUF_SIZE];
  26   size_t in_len = 0;
  27   size_t read_bytes;
  28
  29
  30   font->in_buf = (FT_Byte*)malloc(BUF_SIZE);
  31   if (!font->in_buf)
  32     return FT_Err_Out_Of_Memory;
  33
  34   while ((read_bytes = fread(buf, 1, BUF_SIZE, in_file)) > 0)
  35   {
  36     FT_Byte* in_buf_new;
  37
  38
  39     in_buf_new = (FT_Byte*)realloc(font->in_buf, in_len + read_bytes);
  40     if (!in_buf_new)
  41       return FT_Err_Out_Of_Memory;
  42     else
  43       font->in_buf = in_buf_new;
  44
  45     memcpy(font->in_buf + in_len, buf, read_bytes);
  46
  47     in_len += read_bytes;
  48   }
  49
  50   if (ferror(in_file))
  51     return FT_Err_Invalid_Stream_Read;
  52
  53   /* a valid TTF can never be that small */
  54   if (in_len < 100)
  55     return TA_Err_Invalid_Font_Type;
  56
  57   font->in_len = in_len;
  58
  59   return TA_Err_Ok;
  60 }
  61
  62
  63 FT_Error
  64 TA_font_file_write(FONT* font,
  65                    FILE* out_file)
  66 {
  67   if (fwrite(font->out_buf, 1, font->out_len, out_file) != font->out_len)
  68     return TA_Err_Invalid_Stream_Write;
  69
  70   return TA_Err_Ok;
  71 }
  72
  73
  74 FT_Error
  75 TA_control_file_read(FONT* font,
  76                      FILE* control_file)
  77 {
  78   char* buf[BUF_SIZE];
  79   size_t control_len = 0;
  80   size_t read_bytes;
  81
  82
  83   font->control_buf = (char*)malloc(BUF_SIZE);
  84   if (!font->control_buf)
  85     return FT_Err_Out_Of_Memory;
  86
  87   while ((read_bytes = fread(buf, 1, BUF_SIZE, control_file)) > 0)
  88   {
  89     char* control_buf_new;
  90
  91
  92     /* we store the data as a C string, allocating one more byte */
  93     control_buf_new = (char*)realloc(font->control_buf,
  94                                      control_len + read_bytes + 1);
  95     if (!control_buf_new)
  96       return FT_Err_Out_Of_Memory;
  97     else
  98       font->control_buf = control_buf_new;
  99
 100     memcpy(font->control_buf + control_len, buf, read_bytes);
 101
 102     control_len += read_bytes;
 103   }
 104
 105   if (ferror(control_file))
 106     return FT_Err_Invalid_Stream_Read;
 107
 108   font->control_len = control_len;
 109   font->control_buf[control_len] = '\0';
 110
 111   return TA_Err_Ok;
 112 }
 113
 114 /* end of tafile.c */