path: root/source/fitz/output.c

#include "mupdf/fitz.h"
#include "fitz-imp.h"

#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>

struct fz_output_context_s
{
	int refs;
	fz_output *out;
	fz_output *err;
};

static void std_write(fz_context *ctx, void *opaque, const void *buffer, size_t count);

static fz_output fz_stdout_global = {
	&fz_stdout_global,
	std_write,
	NULL,
	NULL,
	NULL,
};

static fz_output fz_stderr_global = {
	&fz_stderr_global,
	std_write,
	NULL,
	NULL,
	NULL,
};

void
fz_new_output_context(fz_context *ctx)
{
	ctx->output = fz_malloc_struct(ctx, fz_output_context);
	ctx->output->refs = 1;
	ctx->output->out = &fz_stdout_global;
	ctx->output->err = &fz_stderr_global;
}

fz_output_context *
fz_keep_output_context(fz_context *ctx)
{
	if (!ctx)
		return NULL;
	return fz_keep_imp(ctx, ctx->output, &ctx->output->refs);
}

void
fz_drop_output_context(fz_context *ctx)
{
	if (!ctx)
		return;

	if (fz_drop_imp(ctx, ctx->output, &ctx->output->refs))
	{
		/* FIXME: should we flush here? closing the streams seems wrong */
		fz_free(ctx, ctx->output);
		ctx->output = NULL;
	}
}

void
fz_set_stdout(fz_context *ctx, fz_output *out)
{
	fz_drop_output(ctx, ctx->output->out);
	ctx->output->out = out ? out : &fz_stdout_global;
}

void
fz_set_stderr(fz_context *ctx, fz_output *err)
{
	fz_drop_output(ctx, ctx->output->err);
	ctx->output->err = err ? err : &fz_stderr_global;
}

fz_output *
fz_stdout(fz_context *ctx)
{
	return ctx->output->out;
}

fz_output *
fz_stderr(fz_context *ctx)
{
	return ctx->output->err;
}

static void
file_write(fz_context *ctx, void *opaque, const void *buffer, size_t count)
{
	FILE *file = opaque;
	size_t n;

	if (count == 0)
		return;

	if (count == 1)
	{
		int x = putc(((unsigned char*)buffer)[0], file);
		if (x == EOF && ferror(file))
			fz_throw(ctx, FZ_ERROR_GENERIC, "cannot fwrite: %s", strerror(errno));
		return;
	}

	n = fwrite(buffer, 1, count, file);
	if (n < count && ferror(file))
		fz_throw(ctx, FZ_ERROR_GENERIC, "cannot fwrite: %s", strerror(errno));
}

static void
std_write(fz_context *ctx, void *opaque, const void *buffer, size_t count)
{
	FILE *f = opaque == &fz_stdout_global ? stdout : opaque == &fz_stderr_global ? stderr : NULL;
	file_write(ctx, f, buffer, count);
}

static void
file_seek(fz_context *ctx, void *opaque, fz_off_t off, int whence)
{
	FILE *file = opaque;
	int n = fz_fseek(file, off, whence);
	if (n < 0)
		fz_throw(ctx, FZ_ERROR_GENERIC, "cannot fseek: %s", strerror(errno));
}

static fz_off_t
file_tell(fz_context *ctx, void *opaque)
{
	FILE *file = opaque;
	fz_off_t off = fz_ftell(file);
	if (off == -1)
		fz_throw(ctx, FZ_ERROR_GENERIC, "cannot ftell: %s", strerror(errno));
	return off;
}

static void
file_close(fz_context *ctx, void *opaque)
{
	FILE *file = opaque;
	int n = fclose(file);
	if (n < 0)
		fz_throw(ctx, FZ_ERROR_GENERIC, "cannot fclose: %s", strerror(errno));
}

fz_output *
fz_new_output(fz_context *ctx, void *state, fz_output_write_fn *write, fz_output_close_fn *close)
{
	fz_output *out;

	fz_try(ctx)
	{
		out = fz_malloc_struct(ctx, fz_output);
		out->state = state;
		out->write = write;
		out->close = close;
	}
	fz_catch(ctx)
	{
		if (close)
			close(ctx, state);
		fz_rethrow(ctx);
	}
	return out;
}

fz_output *
fz_new_output_with_file_ptr(fz_context *ctx, FILE *file, int close)
{
	fz_output *out = fz_new_output(ctx, file, file_write, close ? file_close : NULL);
	out->seek = file_seek;
	out->tell = file_tell;
	return out;
}

fz_output *
fz_new_output_with_path(fz_context *ctx, const char *filename, int append)
{
	fz_output *out = NULL;
	FILE *file;

	if (!strcmp(filename, "/dev/null") || !fz_strcasecmp(filename, "nul:"))
		return NULL;

	/* Ensure we create a brand new file. We don't want to clobber our old file. */
	if (!append)
	{
		if (fz_remove(filename) < 0)
			if (errno != ENOENT)
				fz_throw(ctx, FZ_ERROR_GENERIC, "cannot remove file '%s': %s", filename, strerror(errno));
	}

	file = fz_fopen(filename, append ? "ab" : "wb");
	if (!file)
		fz_throw(ctx, FZ_ERROR_GENERIC, "cannot open file '%s': %s", filename, strerror(errno));

	fz_try(ctx)
	{
		out = fz_new_output_with_file_ptr(ctx, file, 1);
	}
	fz_catch(ctx)
	{
		fclose(file);
		fz_rethrow(ctx);
	}
	return out;
}

static void
buffer_write(fz_context *ctx, void *opaque, const void *data, size_t len)
{
	fz_buffer *buffer = opaque;
	fz_append_data(ctx, buffer, data, len);
}

static void
buffer_seek(fz_context *ctx, void *opaque, fz_off_t off, int whence)
{
	fz_throw(ctx, FZ_ERROR_GENERIC, "cannot seek in buffer: %s", strerror(errno));
}

static fz_off_t
buffer_tell(fz_context *ctx, void *opaque)
{
	fz_buffer *buffer = opaque;
	return (fz_off_t)buffer->len;
}

static void
buffer_close(fz_context *ctx, void *opaque)
{
	fz_buffer *buffer = opaque;
	fz_drop_buffer(ctx, buffer);
}

fz_output *
fz_new_output_with_buffer(fz_context *ctx, fz_buffer *buf)
{
	fz_output *out = fz_new_output(ctx, fz_keep_buffer(ctx, buf), buffer_write, buffer_close);
	out->seek = buffer_seek;
	out->tell = buffer_tell;
	return out;
}

void
fz_drop_output(fz_context *ctx, fz_output *out)
{
	if (!out) return;
	if (out->close)
		out->close(ctx, out->state);
	if (out->state != &fz_stdout_global && out->state != &fz_stderr_global)
		fz_free(ctx, out);
}

void
fz_seek_output(fz_context *ctx, fz_output *out, fz_off_t off, int whence)
{
	if (!out) return;
	if (out->seek == NULL)
		fz_throw(ctx, FZ_ERROR_GENERIC, "Cannot seek in unseekable output stream\n");
	out->seek(ctx, out->state, off, whence);
}

fz_off_t
fz_tell_output(fz_context *ctx, fz_output *out)
{
	if (!out) return 0;
	if (out->tell == NULL)
		fz_throw(ctx, FZ_ERROR_GENERIC, "Cannot tell in untellable output stream\n");
	return out->tell(ctx, out->state);
}

static void
fz_write_emit(fz_context *ctx, void *out, int c)
{
	fz_write_byte(ctx, out, c);
}

void
fz_write_vprintf(fz_context *ctx, fz_output *out, const char *fmt, va_list args)
{
	if (!out) return;
	fz_format_string(ctx, out, fz_write_emit, fmt, args);
}

void
fz_write_printf(fz_context *ctx, fz_output *out, const char *fmt, ...)
{
	va_list args;
	if (!out) return;
	va_start(args, fmt);
	fz_format_string(ctx, out, fz_write_emit, fmt, args);
	va_end(args);
}

void
fz_save_buffer(fz_context *ctx, fz_buffer *buf, const char *filename)
{
	fz_output *out = fz_new_output_with_path(ctx, filename, 0);
	fz_try(ctx)
		fz_write_data(ctx, out, buf->data, buf->len);
	fz_always(ctx)
		fz_drop_output(ctx, out);
	fz_catch(ctx)
		fz_rethrow(ctx);
}

fz_band_writer *fz_new_band_writer_of_size(fz_context *ctx, size_t size, fz_output *out)
{
	fz_band_writer *writer = fz_calloc(ctx, size, 1);
	writer->out = out;
	return writer;
}

void fz_write_header(fz_context *ctx, fz_band_writer *writer, int w, int h, int n, int alpha, int xres, int yres, int pagenum)
{
	if (writer == NULL || writer->band == NULL)
		return;
	writer->w = w;
	writer->h = h;
	writer->n = n;
	writer->alpha = alpha;
	writer->xres = xres;
	writer->yres = yres;
	writer->pagenum = pagenum;
	writer->line = 0;
	writer->header(ctx, writer);
}

void fz_write_band(fz_context *ctx, fz_band_writer *writer, int stride, int band_height, const unsigned char *samples)
{
	if (writer == NULL || writer->band == NULL)
		return;
	if (writer->line + band_height > writer->h)
		band_height = writer->h - writer->line;
	if (band_height < 0) {
		fz_throw(ctx, FZ_ERROR_GENERIC, "Too much band data!");
	}
	if (band_height > 0) {
		writer->band(ctx, writer, stride, writer->line, band_height, samples);
		writer->line += band_height;
	}
	if (writer->line == writer->h && writer->trailer) {
		writer->trailer(ctx, writer);
		/* Protect against more band_height == 0 calls */
		writer->line++;
	}
}

void fz_drop_band_writer(fz_context *ctx, fz_band_writer *writer)
{
	if (writer == NULL)
		return;
	if (writer->drop != NULL)
		writer->drop(ctx, writer);
	fz_free(ctx, writer);
}