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Add option to input data directly from file

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This commit is contained in:
hooper114 2009-08-20 13:20:59 +00:00
parent 4ff1cf21f1
commit 16a86fc54a
3 changed files with 105 additions and 0 deletions
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86
backend/library.c
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@ -714,3 +714,89 @@ int ZBarcode_Encode_and_Print_Rotated(struct zint_symbol *symbol, unsigned char
error_number = ZBarcode_Print_Rotated(symbol, rotate_angle);
return error_number;
}
int ZBarcode_Encode_from_File(struct zint_symbol *symbol, char *filename)
{
int i;
FILE *file;
unsigned char *buffer;
unsigned long fileLen;
unsigned char used_characters[255];
file = fopen(filename, "rb");
if (!file) {
strcpy(symbol->errtxt, "Unable to read input file");
return ERROR_INVALID_DATA;
}
/* Get file length */
fseek(file, 0, SEEK_END);
fileLen = ftell(file);
fseek(file, 0, SEEK_SET);
if(fileLen > 7100) {
/* The largest amount of data that can be encoded is 7089 numeric digits in QR Code */
strcpy(symbol->errtxt, "Input file too long");
fclose(file);
return ERROR_INVALID_DATA;
}
/* Allocate memory */
buffer = (unsigned char *)malloc((fileLen + 1)*sizeof(unsigned char));
if(!buffer) {
strcpy(symbol->errtxt, "Internal memory error");
fclose(file);
return ERROR_MEMORY;
}
/* Read file contents into buffer */
fread(buffer, fileLen, 1, file);
fclose(file);
if(symbol->input_mode == DATA_MODE) {
/* Look for and correctly handle NULL characters */
for (i = 0; i <= 255; i++) { used_characters[i] = 0;}
for (i = 0; i < (int)fileLen; i++) { used_characters[(int)buffer[i]] = 1;}
if (used_characters[0] == 1) { /* only if data contains a NULL */
/* determine first unused character > 0 */
i = 1;
while (i < 255) {
if (used_characters[i] == 0) {
symbol->nullchar = (char)i;
break;
}
i++;
}
if(symbol->nullchar == 0x00) {
/* No candidate character could be found. Quit */
strcpy(symbol->errtxt, "Could not encode NULL character");
return ERROR_INVALID_OPTION;
}
for(i = 0; i < fileLen; i++) {
if(buffer[i] == 0x00) {
buffer[i] = symbol->nullchar;
}
}
}
}
return ZBarcode_Encode(symbol, buffer);
}
int ZBarcode_Encode_from_File_and_Print(struct zint_symbol *symbol, char *filename, int rotate_angle)
{
int error_number;
error_number = 0;
error_number = ZBarcode_Encode_from_File(symbol, filename);
if(error_number != 0) {
return error_number;
}
return ZBarcode_Print_Rotated(symbol, rotate_angle);
}