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Update documentation and pdf2text example (Issue #95)

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This commit is contained in:
Michael R Sweet
2025-03-06 12:40:19 -05:00
parent 89c2a75376
commit 2f925ccd3c
7 changed files with 726 additions and 75 deletions
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62
examples/pdf2text.c
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@ -1089,6 +1089,7 @@ static name_map_t unicode_map[] =
static void load_encoding(pdfio_obj_t *page_obj, const char *name, int encoding[256]);
static void put_utf8(int ch);
static void puts_utf16(const char *s);
//
@ -1154,7 +1155,7 @@ main(int argc, // I - Number of command-line arguments
// End of an array for justified text...
in_array = false;
}
else if (!first && (isdigit(buffer[0]) || buffer[0] == '-') && fabs(atof(buffer)) > 100)
else if (!first && in_array && (isdigit(buffer[0]) || buffer[0] == '-') && fabs(atof(buffer)) > 100)
{
// Whitespace in a justified text block...
putchar(' ');
@ -1162,12 +1163,18 @@ main(int argc, // I - Number of command-line arguments
else if (buffer[0] == '(')
{
// Text string using an 8-bit encoding
if (first)
first = false;
first = false;
for (bufptr = buffer + 1; *bufptr; bufptr ++)
put_utf8(encoding[*bufptr & 255]);
}
else if (buffer[0] == '<')
{
// Unicode text string
first = false;
puts_utf16(buffer + 1);
}
else if (buffer[0] == '/')
{
// Save name...
@ -1267,6 +1274,7 @@ load_encoding(
if ((font_dict = pdfioDictGetDict(resources_dict, "Font")) == NULL)
{
// Font resources not a dictionary, see if it is an object...
if ((font_obj = pdfioDictGetObj(resources_dict, "Font")) != NULL)
font_dict = pdfioObjGetDict(font_obj);
@ -1362,3 +1370,51 @@ put_utf8(int ch) // I - Character
putchar(0x80 | (ch & 0x3f));
}
}
//
// 'puts_utf16()' - Output a hex-encoded UTF-16 string.
//
static void
puts_utf16(const char *s) // I - Hex string
{
size_t length = strlen(s) / 4; // Length of string
int ch; // Character
char temp[5]; // Hex characters
temp[4] = '\0';
while (length > 0)
{
// Get the next Unicode character...
temp[0] = *s++;
temp[1] = *s++;
temp[2] = *s++;
temp[3] = *s++;
length --;
if ((ch = strtol(temp, NULL, 16)) < 0)
break;
if (ch >= 0xd800 && ch <= 0xdbff && length > 0)
{
// Multi-word UTF-16 char...
int lch; // Lower bits
temp[0] = *s++;
temp[1] = *s++;
temp[2] = *s++;
temp[3] = *s++;
length --;
if ((lch = strtol(temp, NULL, 16)) < 0 || lch < 0xdc00 || lch >= 0xdfff)
break;
ch = (((ch & 0x3ff) << 10) | (lch & 0x3ff)) + 0x10000;
}
put_utf8(ch);
}
}