mirror of
https://github.com/michaelrsweet/pdfio.git
synced 2025-08-29 07:12:02 +02:00
Add pdfioFileCreateFontObjFromData function (Issue #120)
This commit is contained in:
Michael R Sweet
568
ttf.c
568
ttf.c
@@ -177,9 +177,19 @@ typedef struct _ttf_off_names_s // OFF/TTF naming table
|
||||
unsigned storage_size; // Size of storage area
|
||||
} _ttf_off_names_t;
|
||||
|
||||
typedef size_t (*_ttf_read_cb_t)(ttf_t *font, void *buffer, size_t bytes);
|
||||
// Font read callback, returns number of bytes read
|
||||
typedef bool (*_ttf_seek_cb_t)(ttf_t *font, size_t offset);
|
||||
// Font seek callback, returns `true` on success
|
||||
|
||||
struct _ttf_s
|
||||
{
|
||||
int fd; // File descriptor
|
||||
_ttf_read_cb_t read_cb; // Read callback
|
||||
_ttf_seek_cb_t seek_cb; // Seek callback
|
||||
int file_fd; // File descriptor for ttfCreate
|
||||
const char *data; // Font data for ttfCreateData
|
||||
size_t data_size; // Size of font data for ttfCreateData
|
||||
size_t data_offset; // Offset within input
|
||||
size_t idx; // Font number in file
|
||||
ttf_err_cb_t err_cb; // Error callback, if any
|
||||
void *err_data; // Error callback data
|
||||
@@ -245,10 +255,10 @@ typedef struct _ttf_off_head_s // Font header
|
||||
} _ttf_off_head_t;
|
||||
|
||||
#define TTF_OFF_macStyle_Bold 0x01
|
||||
#define TTF_OFF_macStyle_Italic 0x02
|
||||
#define TTF_OFF_macStyle_Italic 0x02
|
||||
#define TTF_OFF_macStyle_Underline 0x04
|
||||
#define TTF_OFF_macStyle_Outline 0x08
|
||||
#define TTF_OFF_macStyle_Shadow 0x10
|
||||
#define TTF_OFF_macStyle_Shadow 0x10
|
||||
#define TTF_OFF_macStyle_Condensed 0x20
|
||||
#define TTF_OFF_macStyle_Extended 0x40
|
||||
|
||||
@@ -282,7 +292,12 @@ typedef struct _ttf_off_post_s // PostScript information
|
||||
//
|
||||
|
||||
static char *copy_name(ttf_t *font, unsigned name_id);
|
||||
static ttf_t *create_font(const char *filename, const void *data, size_t datasize, size_t idx, ttf_err_cb_t err_cb, void *err_data);
|
||||
static void errorf(ttf_t *font, const char *message, ...) TTF_FORMAT_ARGS(2,3);
|
||||
static size_t fd_read_cb(ttf_t *font, void *buffer, size_t bytes);
|
||||
static bool fd_seek_cb(ttf_t *font, size_t offset);
|
||||
static size_t mem_read_cb(ttf_t *font, void *buffer, size_t bytes);
|
||||
static bool mem_seek_cb(ttf_t *font, size_t offset);
|
||||
static bool read_cmap(ttf_t *font);
|
||||
static bool read_head(ttf_t *font, _ttf_off_head_t *head);
|
||||
static bool read_hhea(ttf_t *font, _ttf_off_hhea_t *hhea);
|
||||
@@ -329,15 +344,6 @@ ttfCreate(const char *filename, // I - Filename
|
||||
ttf_err_cb_t err_cb, // I - Error callback or `NULL` to log to stderr
|
||||
void *err_data) // I - Error callback data
|
||||
{
|
||||
ttf_t *font = NULL; // New font object
|
||||
size_t i; // Looping var
|
||||
_ttf_metric_t *widths = NULL; // Glyph metrics
|
||||
_ttf_off_head_t head; // head table
|
||||
_ttf_off_hhea_t hhea; // hhea table
|
||||
_ttf_off_os_2_t os_2; // OS/2 table
|
||||
_ttf_off_post_t post; // PostScript table
|
||||
|
||||
|
||||
TTF_DEBUG("ttfCreate(filename=\"%s\", idx=%u, err_cb=%p, err_data=%p)\n", filename, (unsigned)idx, err_cb, err_data);
|
||||
|
||||
// Range check input..
|
||||
@@ -347,178 +353,57 @@ ttfCreate(const char *filename, // I - Filename
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
// Allocate memory...
|
||||
if ((font = (ttf_t *)calloc(1, sizeof(ttf_t))) == NULL)
|
||||
// Open and return the font...
|
||||
return (create_font(filename, /*data*/NULL, /*datasize*/0, idx, err_cb, err_data));
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'ttfCreateData()' - Create a new font object from a memory buffer.
|
||||
//
|
||||
// This function creates a new font object from a memory buffer. The "data"
|
||||
// argument specifies a pointer to the first byte of data and the "datasize"
|
||||
// argument specifies the length of the memory buffer in bytes.
|
||||
//
|
||||
// > Note: The caller is responsible for ensuring that the memory buffer is
|
||||
// > available until the font object is deleted with @link ttfDelete@.
|
||||
//
|
||||
// The "idx" argument specifies the font to load from a collection - the first
|
||||
// font is number `0`. Once created, you can call the @link ttfGetNumFonts@
|
||||
// function to determine whether the loaded font file is a collection with more
|
||||
// than one font.
|
||||
//
|
||||
// The "err_cb" and "err_data" arguments specify a callback function and data
|
||||
// pointer for receiving error messages. If `NULL`, errors are sent to the
|
||||
// `stderr` file. The callback function receives the data pointer and a text
|
||||
// message string, for example:
|
||||
//
|
||||
// ```
|
||||
// void my_err_cb(void *err_data, const char *message)
|
||||
// {
|
||||
// fprintf(stderr, "ERROR: %s\n", message);
|
||||
// }
|
||||
// ```
|
||||
//
|
||||
|
||||
ttf_t * // O - New font object
|
||||
ttfCreateData(const void *data, // I - Buffer
|
||||
size_t datasize, // I - Size of buffer in bytes
|
||||
size_t idx, // I - Font number to create in collection (0-based)
|
||||
ttf_err_cb_t err_cb, // I - Error callback or `NULL` to log to stderr
|
||||
void *err_data) // I - Error callback data
|
||||
{
|
||||
TTF_DEBUG("ttfCreateData(data=%p, datasize=%lu, idx=%u, err_cb=%p, err_data=%p)\n", data, (unsigned long)datasize, (unsigned)idx, err_cb, err_data);
|
||||
|
||||
// Range check input..
|
||||
if (!data || datasize == 0)
|
||||
{
|
||||
errno = EINVAL;
|
||||
return (NULL);
|
||||
|
||||
font->idx = idx;
|
||||
font->err_cb = err_cb;
|
||||
font->err_data = err_data;
|
||||
|
||||
// Open the font file...
|
||||
if ((font->fd = open(filename, O_RDONLY | O_BINARY)) < 0)
|
||||
{
|
||||
errorf(font, "Unable to open '%s': %s", filename, strerror(errno));
|
||||
goto error;
|
||||
}
|
||||
|
||||
TTF_DEBUG("ttfCreate: fd=%d\n", font->fd);
|
||||
|
||||
// Read the table of contents and the identifying names...
|
||||
if (!read_table(font))
|
||||
goto error;
|
||||
|
||||
TTF_DEBUG("ttfCreate: num_entries=%d\n", font->table.num_entries);
|
||||
|
||||
if (!read_names(font))
|
||||
goto error;
|
||||
|
||||
TTF_DEBUG("ttfCreate: num_names=%d\n", font->names.num_names);
|
||||
|
||||
// Copy key font meta data strings...
|
||||
font->copyright = copy_name(font, TTF_OFF_Copyright);
|
||||
font->family = copy_name(font, TTF_OFF_FontFamily);
|
||||
font->postscript_name = copy_name(font, TTF_OFF_PostScriptName);
|
||||
font->version = copy_name(font, TTF_OFF_FontVersion);
|
||||
|
||||
if (read_post(font, &post))
|
||||
{
|
||||
font->italic_angle = post.italicAngle;
|
||||
font->is_fixed = post.isFixedPitch != 0;
|
||||
}
|
||||
|
||||
TTF_DEBUG("ttfCreate: copyright=\"%s\"\n", font->copyright);
|
||||
TTF_DEBUG("ttfCreate: family=\"%s\"\n", font->family);
|
||||
TTF_DEBUG("ttfCreate: postscript_name=\"%s\"\n", font->postscript_name);
|
||||
TTF_DEBUG("ttfCreate: version=\"%s\"\n", font->version);
|
||||
TTF_DEBUG("ttfCreate: italic_angle=%g\n", font->italic_angle);
|
||||
TTF_DEBUG("ttfCreate: is_fixed=%s\n", font->is_fixed ? "true" : "false");
|
||||
|
||||
if (!read_cmap(font))
|
||||
goto error;
|
||||
|
||||
if (!read_head(font, &head))
|
||||
goto error;
|
||||
|
||||
font->units = (float)head.unitsPerEm;
|
||||
font->x_max = head.xMax;
|
||||
font->x_min = head.xMin;
|
||||
font->y_max = head.yMax;
|
||||
font->y_min = head.yMin;
|
||||
|
||||
if (head.macStyle & TTF_OFF_macStyle_Italic)
|
||||
{
|
||||
if (font->postscript_name && strstr(font->postscript_name, "Oblique"))
|
||||
font->style = TTF_STYLE_OBLIQUE;
|
||||
else
|
||||
font->style = TTF_STYLE_ITALIC;
|
||||
}
|
||||
else
|
||||
font->style = TTF_STYLE_NORMAL;
|
||||
|
||||
if (!read_hhea(font, &hhea))
|
||||
goto error;
|
||||
|
||||
font->ascent = hhea.ascender;
|
||||
font->descent = hhea.descender;
|
||||
|
||||
if (read_maxp(font) < 0)
|
||||
goto error;
|
||||
|
||||
if (hhea.numberOfHMetrics > 0)
|
||||
{
|
||||
if ((widths = read_hmtx(font, &hhea)) == NULL)
|
||||
goto error;
|
||||
}
|
||||
else
|
||||
{
|
||||
errorf(font, "Number of horizontal metrics is 0.");
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (read_os_2(font, &os_2))
|
||||
{
|
||||
// Copy key values from OS/2 table...
|
||||
static const ttf_stretch_t stretches[] =
|
||||
{
|
||||
TTF_STRETCH_ULTRA_CONDENSED, // ultra-condensed
|
||||
TTF_STRETCH_EXTRA_CONDENSED, // extra-condensed
|
||||
TTF_STRETCH_CONDENSED, // condensed
|
||||
TTF_STRETCH_SEMI_CONDENSED, // semi-condensed
|
||||
TTF_STRETCH_NORMAL, // normal
|
||||
TTF_STRETCH_SEMI_EXPANDED, // semi-expanded
|
||||
TTF_STRETCH_EXPANDED, // expanded
|
||||
TTF_STRETCH_EXTRA_EXPANDED, // extra-expanded
|
||||
TTF_STRETCH_ULTRA_EXPANDED // ultra-expanded
|
||||
};
|
||||
|
||||
if (os_2.usWidthClass >= 1 && os_2.usWidthClass <= (int)(sizeof(stretches) / sizeof(stretches[0])))
|
||||
font->stretch = stretches[os_2.usWidthClass - 1];
|
||||
|
||||
font->weight = (short)os_2.usWeightClass;
|
||||
font->cap_height = os_2.sCapHeight;
|
||||
font->x_height = os_2.sxHeight;
|
||||
}
|
||||
else
|
||||
{
|
||||
// Default key values since there isn't an OS/2 table...
|
||||
TTF_DEBUG("ttfCreate: Unable to read OS/2 table.\n");
|
||||
|
||||
font->weight = 400;
|
||||
}
|
||||
|
||||
if (font->cap_height == 0)
|
||||
font->cap_height = font->ascent;
|
||||
|
||||
if (font->x_height == 0)
|
||||
font->x_height = 3 * font->ascent / 5;
|
||||
|
||||
// Build a sparse glyph widths table...
|
||||
font->min_char = -1;
|
||||
|
||||
for (i = 0; i < font->num_cmap; i ++)
|
||||
{
|
||||
if (font->cmap[i] >= 0)
|
||||
{
|
||||
int bin = (int)i / 256, // Sub-array bin
|
||||
glyph = font->cmap[i]; // Glyph index
|
||||
|
||||
// Update min/max...
|
||||
if (font->min_char < 0)
|
||||
font->min_char = (int)i;
|
||||
|
||||
font->max_char = (int)i;
|
||||
|
||||
// Allocate a sub-array as needed...
|
||||
if (!font->widths[bin])
|
||||
font->widths[bin] = (_ttf_metric_t *)calloc(256, sizeof(_ttf_metric_t));
|
||||
|
||||
// Copy the width of the specified glyph or the last one if we are past
|
||||
// the end of the table...
|
||||
if (glyph >= hhea.numberOfHMetrics)
|
||||
font->widths[bin][i & 255] = widths[hhea.numberOfHMetrics - 1];
|
||||
else
|
||||
font->widths[bin][i & 255] = widths[glyph];
|
||||
}
|
||||
|
||||
#ifdef DEBUG
|
||||
if (i >= ' ' && i < 127 && font->widths[0])
|
||||
TTF_DEBUG("ttfCreate: width['%c']=%d(%d)\n", (char)i, font->widths[0][i].width, font->widths[0][i].left_bearing);
|
||||
#endif // DEBUG
|
||||
}
|
||||
|
||||
// Cleanup and return the font...
|
||||
free(widths);
|
||||
|
||||
return (font);
|
||||
|
||||
// If we get here something bad happened...
|
||||
error:
|
||||
|
||||
free(widths);
|
||||
ttfDelete(font);
|
||||
|
||||
return (NULL);
|
||||
// Open and return the font...
|
||||
return (create_font(/*filename*/NULL, data, datasize, idx, err_cb, err_data));
|
||||
}
|
||||
|
||||
|
||||
@@ -537,8 +422,8 @@ ttfDelete(ttf_t *font) // I - Font
|
||||
return;
|
||||
|
||||
// Close the font file...
|
||||
if (font->fd >= 0)
|
||||
close(font->fd);
|
||||
if (font->file_fd >= 0)
|
||||
close(font->file_fd);
|
||||
|
||||
// Free all memory used...
|
||||
free(font->copyright);
|
||||
@@ -1043,6 +928,219 @@ copy_name(ttf_t *font, // I - Font
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'create_font()' - Create a font object from the file or data.
|
||||
//
|
||||
|
||||
static ttf_t *
|
||||
create_font(const char *filename, // I - Filename of `NULL`
|
||||
const void *data, // I - Data pointer or `NULL`
|
||||
size_t datasize, // I - Size of data or 0
|
||||
size_t idx, // I - Font index
|
||||
ttf_err_cb_t err_cb, // I - Error callback function
|
||||
void *err_data) // I - Error callback data
|
||||
{
|
||||
ttf_t *font = NULL; // New font object
|
||||
size_t i; // Looping var
|
||||
_ttf_metric_t *widths = NULL; // Glyph metrics
|
||||
_ttf_off_head_t head; // head table
|
||||
_ttf_off_hhea_t hhea; // hhea table
|
||||
_ttf_off_os_2_t os_2; // OS/2 table
|
||||
_ttf_off_post_t post; // PostScript table
|
||||
|
||||
|
||||
TTF_DEBUG("create_font(filename=\"%s\", data=%p, datasize=%lu, idx=%u, err_cb=%p, err_data=%p)\n", filename, data, (unsigned long)datasize, (unsigned)idx, err_cb, err_data);
|
||||
|
||||
// Allocate memory...
|
||||
if ((font = (ttf_t *)calloc(1, sizeof(ttf_t))) == NULL)
|
||||
return (NULL);
|
||||
|
||||
font->idx = idx;
|
||||
font->err_cb = err_cb;
|
||||
font->err_data = err_data;
|
||||
|
||||
if (filename)
|
||||
{
|
||||
// Open the font file...
|
||||
if ((font->file_fd = open(filename, O_RDONLY | O_BINARY)) < 0)
|
||||
{
|
||||
errorf(font, "Unable to open '%s': %s", filename, strerror(errno));
|
||||
goto error;
|
||||
}
|
||||
|
||||
TTF_DEBUG("create_font: file_fd=%d\n", font->file_fd);
|
||||
|
||||
font->read_cb = fd_read_cb;
|
||||
font->seek_cb = fd_seek_cb;
|
||||
}
|
||||
else
|
||||
{
|
||||
// Read from memory...
|
||||
font->file_fd = -1;
|
||||
font->data = (const char *)data;
|
||||
font->data_size = datasize;
|
||||
font->read_cb = mem_read_cb;
|
||||
font->seek_cb = mem_seek_cb;
|
||||
}
|
||||
|
||||
// Read the table of contents and the identifying names...
|
||||
if (!read_table(font))
|
||||
goto error;
|
||||
|
||||
TTF_DEBUG("create_font: num_entries=%d\n", font->table.num_entries);
|
||||
|
||||
if (!read_names(font))
|
||||
goto error;
|
||||
|
||||
TTF_DEBUG("create_font: num_names=%d\n", font->names.num_names);
|
||||
|
||||
// Copy key font meta data strings...
|
||||
font->copyright = copy_name(font, TTF_OFF_Copyright);
|
||||
font->family = copy_name(font, TTF_OFF_FontFamily);
|
||||
font->postscript_name = copy_name(font, TTF_OFF_PostScriptName);
|
||||
font->version = copy_name(font, TTF_OFF_FontVersion);
|
||||
|
||||
if (read_post(font, &post))
|
||||
{
|
||||
font->italic_angle = post.italicAngle;
|
||||
font->is_fixed = post.isFixedPitch != 0;
|
||||
}
|
||||
|
||||
TTF_DEBUG("create_font: copyright=\"%s\"\n", font->copyright);
|
||||
TTF_DEBUG("create_font: family=\"%s\"\n", font->family);
|
||||
TTF_DEBUG("create_font: postscript_name=\"%s\"\n", font->postscript_name);
|
||||
TTF_DEBUG("create_font: version=\"%s\"\n", font->version);
|
||||
TTF_DEBUG("create_font: italic_angle=%g\n", font->italic_angle);
|
||||
TTF_DEBUG("create_font: is_fixed=%s\n", font->is_fixed ? "true" : "false");
|
||||
|
||||
if (!read_cmap(font))
|
||||
goto error;
|
||||
|
||||
if (!read_head(font, &head))
|
||||
goto error;
|
||||
|
||||
font->units = (float)head.unitsPerEm;
|
||||
font->x_max = head.xMax;
|
||||
font->x_min = head.xMin;
|
||||
font->y_max = head.yMax;
|
||||
font->y_min = head.yMin;
|
||||
|
||||
if (head.macStyle & TTF_OFF_macStyle_Italic)
|
||||
{
|
||||
if (font->postscript_name && strstr(font->postscript_name, "Oblique"))
|
||||
font->style = TTF_STYLE_OBLIQUE;
|
||||
else
|
||||
font->style = TTF_STYLE_ITALIC;
|
||||
}
|
||||
else
|
||||
font->style = TTF_STYLE_NORMAL;
|
||||
|
||||
if (!read_hhea(font, &hhea))
|
||||
goto error;
|
||||
|
||||
font->ascent = hhea.ascender;
|
||||
font->descent = hhea.descender;
|
||||
|
||||
if (read_maxp(font) < 0)
|
||||
goto error;
|
||||
|
||||
if (hhea.numberOfHMetrics > 0)
|
||||
{
|
||||
if ((widths = read_hmtx(font, &hhea)) == NULL)
|
||||
goto error;
|
||||
}
|
||||
else
|
||||
{
|
||||
errorf(font, "Number of horizontal metrics is 0.");
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (read_os_2(font, &os_2))
|
||||
{
|
||||
// Copy key values from OS/2 table...
|
||||
static const ttf_stretch_t stretches[] =
|
||||
{
|
||||
TTF_STRETCH_ULTRA_CONDENSED, // ultra-condensed
|
||||
TTF_STRETCH_EXTRA_CONDENSED, // extra-condensed
|
||||
TTF_STRETCH_CONDENSED, // condensed
|
||||
TTF_STRETCH_SEMI_CONDENSED, // semi-condensed
|
||||
TTF_STRETCH_NORMAL, // normal
|
||||
TTF_STRETCH_SEMI_EXPANDED, // semi-expanded
|
||||
TTF_STRETCH_EXPANDED, // expanded
|
||||
TTF_STRETCH_EXTRA_EXPANDED, // extra-expanded
|
||||
TTF_STRETCH_ULTRA_EXPANDED // ultra-expanded
|
||||
};
|
||||
|
||||
if (os_2.usWidthClass >= 1 && os_2.usWidthClass <= (int)(sizeof(stretches) / sizeof(stretches[0])))
|
||||
font->stretch = stretches[os_2.usWidthClass - 1];
|
||||
|
||||
font->weight = (short)os_2.usWeightClass;
|
||||
font->cap_height = os_2.sCapHeight;
|
||||
font->x_height = os_2.sxHeight;
|
||||
}
|
||||
else
|
||||
{
|
||||
// Default key values since there isn't an OS/2 table...
|
||||
TTF_DEBUG("create_font: Unable to read OS/2 table.\n");
|
||||
|
||||
font->weight = 400;
|
||||
}
|
||||
|
||||
if (font->cap_height == 0)
|
||||
font->cap_height = font->ascent;
|
||||
|
||||
if (font->x_height == 0)
|
||||
font->x_height = 3 * font->ascent / 5;
|
||||
|
||||
// Build a sparse glyph widths table...
|
||||
font->min_char = -1;
|
||||
|
||||
for (i = 0; i < font->num_cmap; i ++)
|
||||
{
|
||||
if (font->cmap[i] >= 0)
|
||||
{
|
||||
int bin = (int)i / 256, // Sub-array bin
|
||||
glyph = font->cmap[i]; // Glyph index
|
||||
|
||||
// Update min/max...
|
||||
if (font->min_char < 0)
|
||||
font->min_char = (int)i;
|
||||
|
||||
font->max_char = (int)i;
|
||||
|
||||
// Allocate a sub-array as needed...
|
||||
if (!font->widths[bin])
|
||||
font->widths[bin] = (_ttf_metric_t *)calloc(256, sizeof(_ttf_metric_t));
|
||||
|
||||
// Copy the width of the specified glyph or the last one if we are past
|
||||
// the end of the table...
|
||||
if (glyph >= hhea.numberOfHMetrics)
|
||||
font->widths[bin][i & 255] = widths[hhea.numberOfHMetrics - 1];
|
||||
else
|
||||
font->widths[bin][i & 255] = widths[glyph];
|
||||
}
|
||||
|
||||
#ifdef DEBUG
|
||||
if (i >= ' ' && i < 127 && font->widths[0])
|
||||
TTF_DEBUG("create_font: width['%c']=%d(%d)\n", (char)i, font->widths[0][i].width, font->widths[0][i].left_bearing);
|
||||
#endif // DEBUG
|
||||
}
|
||||
|
||||
// Cleanup and return the font...
|
||||
free(widths);
|
||||
|
||||
return (font);
|
||||
|
||||
// If we get here something bad happened...
|
||||
error:
|
||||
|
||||
free(widths);
|
||||
ttfDelete(font);
|
||||
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'errorf()' - Show an error message.
|
||||
//
|
||||
@@ -1070,9 +1168,85 @@ errorf(ttf_t *font, // I - Font
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* 'read_cmap()' - Read the cmap table, getting the Unicode mapping table.
|
||||
*/
|
||||
//
|
||||
// 'fd_read_cb()' - Read from a file.
|
||||
//
|
||||
|
||||
static size_t // O - Number of bytes read
|
||||
fd_read_cb(ttf_t *font, // I - Font
|
||||
void *buffer, // I - Read buffer
|
||||
size_t bytes) // I - Number of bytes to read
|
||||
{
|
||||
ssize_t rbytes; // Bytes read
|
||||
|
||||
|
||||
if ((rbytes = read(font->file_fd, buffer, bytes)) < 0)
|
||||
return (0);
|
||||
|
||||
return ((size_t)rbytes);
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'fd_seek_cb()' - Seek in a file.
|
||||
//
|
||||
|
||||
static bool // O - `true` on success, `false` on failure
|
||||
fd_seek_cb(ttf_t *font, // I - Font
|
||||
size_t offset) // I - Offset in data
|
||||
{
|
||||
return (lseek(font->file_fd, offset, SEEK_SET) == offset);
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'mem_read_cb()' - Read from a memory buffer.
|
||||
//
|
||||
|
||||
static size_t // O - Number of bytes read
|
||||
mem_read_cb(ttf_t *font, // I - Font
|
||||
void *buffer, // I - Read buffer
|
||||
size_t bytes) // I - Number of bytes to read
|
||||
{
|
||||
size_t rbytes; // Bytes to copy
|
||||
|
||||
|
||||
if (font->data_offset >= font->data_size)
|
||||
return (0);
|
||||
|
||||
if ((rbytes = font->data_size - font->data_offset) > bytes)
|
||||
rbytes = bytes;
|
||||
|
||||
memcpy(buffer, font->data + font->data_offset, rbytes);
|
||||
font->data_offset += rbytes;
|
||||
|
||||
return (rbytes);
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'mem_seek_cb()' - Seek in a memory buffer.
|
||||
//
|
||||
|
||||
static bool // O - `true` on success, `false` on error
|
||||
mem_seek_cb(ttf_t *font, // I - Font
|
||||
size_t offset) // I - Offset in data
|
||||
{
|
||||
if (offset >= font->data_size)
|
||||
{
|
||||
errno = ENXIO;
|
||||
return (false);
|
||||
}
|
||||
|
||||
font->data_offset = offset;
|
||||
|
||||
return (true);
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'read_cmap()' - Read the cmap table, getting the Unicode mapping table.
|
||||
//
|
||||
|
||||
static bool // O - `true` on success, `false` on error
|
||||
read_cmap(ttf_t *font) // I - Font
|
||||
@@ -1219,7 +1393,7 @@ read_cmap(ttf_t *font) // I - Font
|
||||
return (false);
|
||||
}
|
||||
|
||||
if (read(font->fd, bmap, font->num_cmap) != (ssize_t)font->num_cmap)
|
||||
if ((font->read_cb)(font, bmap, font->num_cmap) != font->num_cmap)
|
||||
{
|
||||
errorf(font, "Unable to read cmap table length at offset %u.", coffset);
|
||||
return (false);
|
||||
@@ -1646,9 +1820,9 @@ read_hhea(ttf_t *font, // I - Font
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* 'read_hmtx()' - Read the horizontal metrics from the font.
|
||||
*/
|
||||
//
|
||||
// 'read_hmtx()' - Read the horizontal metrics from the font.
|
||||
//
|
||||
|
||||
static _ttf_metric_t * // O - Array of glyph metrics
|
||||
read_hmtx(ttf_t *font, // I - Font
|
||||
@@ -1774,7 +1948,7 @@ read_names(ttf_t *font) // I - Font
|
||||
|
||||
length -= (unsigned)offset;
|
||||
|
||||
if (read(font->fd, font->names.storage, length) < 0)
|
||||
if ((font->read_cb)(font, font->names.storage, length) == 0)
|
||||
{
|
||||
errorf(font, "Unable to read name table: %s", strerror(errno));
|
||||
return (false);
|
||||
@@ -1823,7 +1997,7 @@ read_os_2(ttf_t *font, // I - Font
|
||||
/* yStrikeoutOffset */ read_short(font);
|
||||
/* sFamilyClass */ read_short(font);
|
||||
/* panose[10] */
|
||||
if (read(font->fd, panose, sizeof(panose)) != (ssize_t)sizeof(panose))
|
||||
if ((font->read_cb)(font, panose, sizeof(panose)) != sizeof(panose))
|
||||
return (false);
|
||||
/* ulUnicodeRange1 */ read_ulong(font);
|
||||
/* ulUnicodeRange2 */ read_ulong(font);
|
||||
@@ -1885,7 +2059,7 @@ read_short(ttf_t *font) // I - Font
|
||||
unsigned char buffer[2]; // Read buffer
|
||||
|
||||
|
||||
if (read(font->fd, buffer, sizeof(buffer)) != sizeof(buffer))
|
||||
if ((font->read_cb)(font, buffer, sizeof(buffer)) != sizeof(buffer))
|
||||
return (EOF);
|
||||
else if (buffer[0] & 0x80)
|
||||
return (((buffer[0] << 8) | buffer[1]) - 65536);
|
||||
@@ -1958,7 +2132,7 @@ read_table(ttf_t *font) // I - Font
|
||||
|
||||
TTF_DEBUG("read_table: Offset for font %u is %u.\n", (unsigned)font->idx, temp);
|
||||
|
||||
if (lseek(font->fd, temp + 4, SEEK_SET) < 0)
|
||||
if (!(font->seek_cb)(font, temp + 4))
|
||||
{
|
||||
errorf(font, "Unable to seek to font %u: %s", (unsigned)font->idx, strerror(errno));
|
||||
return (false);
|
||||
@@ -2034,7 +2208,7 @@ read_ulong(ttf_t *font) // I - Font
|
||||
unsigned char buffer[4]; // Read buffer
|
||||
|
||||
|
||||
if (read(font->fd, buffer, sizeof(buffer)) != sizeof(buffer))
|
||||
if ((font->read_cb)(font, buffer, sizeof(buffer)) != sizeof(buffer))
|
||||
return ((unsigned)EOF);
|
||||
else
|
||||
return ((unsigned)((buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]));
|
||||
@@ -2051,7 +2225,7 @@ read_ushort(ttf_t *font) // I - Font
|
||||
unsigned char buffer[2]; // Read buffer
|
||||
|
||||
|
||||
if (read(font->fd, buffer, sizeof(buffer)) != sizeof(buffer))
|
||||
if ((font->read_cb)(font, buffer, sizeof(buffer)) != sizeof(buffer))
|
||||
return (EOF);
|
||||
else
|
||||
return ((buffer[0] << 8) | buffer[1]);
|
||||
@@ -2078,7 +2252,7 @@ seek_table(ttf_t *font, // I - Font
|
||||
if (current->tag == tag)
|
||||
{
|
||||
// Found it, seek and return...
|
||||
if (lseek(font->fd, current->offset + offset, SEEK_SET) == (current->offset + offset))
|
||||
if ((font->seek_cb)(font, current->offset + offset))
|
||||
{
|
||||
// Successful seek...
|
||||
return (current->length - offset);
|
||||
|
||||
Reference in New Issue
Block a user