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/* See LICENSE file for copyright and license details. */
#include "common.h"
#define PARSE_INT8(TEXT) ((int16_t)((int)*(const uint8_t *)(TEXT) - 128))
int
libparsepcf_get_metrics(const void *file, size_t size,
const struct libparsepcf_table *table,
struct libparsepcf_metrics *metrics,
size_t first, size_t count)
{
const char *text = file;
size_t pos, i;
int msb = table->format & LIBPARSEPCF_BYTE;
int compressed = table->format & LIBPARSEPCF_COMPRESSED_METRICS;
(void) size;
pos = table->offset + (compressed ? 6 : 8);
pos += first * (compressed ? 5 : 12);
if (compressed) {
for (i = 0; i < count; i++, pos += 5) {
metrics[i].left_side_bearing = PARSE_INT8(&text[pos + 0]);
metrics[i].right_side_bearing = PARSE_INT8(&text[pos + 1]);
metrics[i].character_width = PARSE_INT8(&text[pos + 2]);
metrics[i].character_ascent = PARSE_INT8(&text[pos + 3]);
metrics[i].character_descent = PARSE_INT8(&text[pos + 4]);
metrics[i].character_attributes = 0;
}
} else {
for (i = 0; i < count; i++, pos += 12) {
metrics[i].left_side_bearing = PARSE_INT16(&text[pos + 0], msb);
metrics[i].right_side_bearing = PARSE_INT16(&text[pos + 2], msb);
metrics[i].character_width = PARSE_INT16(&text[pos + 4], msb);
metrics[i].character_ascent = PARSE_INT16(&text[pos + 6], msb);
metrics[i].character_descent = PARSE_INT16(&text[pos + 8], msb);
metrics[i].character_attributes = PARSE_UINT16(&text[pos + 10], msb);
}
}
for (i = 0; i < count; i++) {
if (metrics[i].left_side_bearing > metrics[i].right_side_bearing ||
(int32_t)metrics[i].character_ascent < -(int32_t)metrics[i].character_descent)
goto ebfont;
}
return 0;
ebfont:
errno = EBFONT;
return -1;
}
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