127 lines
2.7 KiB
C
127 lines
2.7 KiB
C
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#include "fitz-imp.h"
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/* This code needs to be kept out of stm_buffer.c to avoid it being
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* pulled into cmapdump.c */
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void
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fz_drop_compressed_buffer(fz_context *ctx, fz_compressed_buffer *buf)
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{
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if (buf)
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{
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if (buf->params.type == FZ_IMAGE_JBIG2)
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fz_drop_jbig2_globals(ctx, buf->params.u.jbig2.globals);
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fz_drop_buffer(ctx, buf->buffer);
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fz_free(ctx, buf);
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}
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}
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fz_stream *
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fz_open_image_decomp_stream_from_buffer(fz_context *ctx, fz_compressed_buffer *buffer, int *l2factor)
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{
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fz_stream *head, *tail;
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tail = fz_open_buffer(ctx, buffer->buffer);
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fz_try(ctx)
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head = fz_open_image_decomp_stream(ctx, tail, &buffer->params, l2factor);
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fz_always(ctx)
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fz_drop_stream(ctx, tail);
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fz_catch(ctx)
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fz_rethrow(ctx);
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return head;
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}
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fz_stream *
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fz_open_image_decomp_stream(fz_context *ctx, fz_stream *tail, fz_compression_params *params, int *l2factor)
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{
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fz_stream *head = NULL, *body = NULL;
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int our_l2factor = 0;
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fz_var(body);
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fz_try(ctx)
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{
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switch (params->type)
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{
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default:
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head = fz_keep_stream(ctx, tail);
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break;
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case FZ_IMAGE_FAX:
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head = fz_open_faxd(ctx, tail,
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params->u.fax.k,
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params->u.fax.end_of_line,
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params->u.fax.encoded_byte_align,
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params->u.fax.columns,
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params->u.fax.rows,
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params->u.fax.end_of_block,
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params->u.fax.black_is_1);
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break;
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case FZ_IMAGE_JPEG:
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if (l2factor)
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{
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our_l2factor = *l2factor;
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if (our_l2factor > 3)
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our_l2factor = 3;
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*l2factor -= our_l2factor;
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}
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head = fz_open_dctd(ctx, tail, params->u.jpeg.color_transform, our_l2factor, NULL);
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break;
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case FZ_IMAGE_JBIG2:
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head = fz_open_jbig2d(ctx, tail, params->u.jbig2.globals);
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break;
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case FZ_IMAGE_RLD:
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head = fz_open_rld(ctx, tail);
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break;
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case FZ_IMAGE_FLATE:
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head = fz_open_flated(ctx, tail, 15);
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if (params->u.flate.predictor > 1)
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{
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body = head;
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head = fz_open_predict(ctx, body,
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params->u.flate.predictor,
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params->u.flate.columns,
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params->u.flate.colors,
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params->u.flate.bpc);
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}
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break;
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case FZ_IMAGE_LZW:
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head = fz_open_lzwd(ctx, tail, params->u.lzw.early_change, 9, 0, 0);
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if (params->u.flate.predictor > 1)
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{
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body = head;
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head = fz_open_predict(ctx, body,
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params->u.lzw.predictor,
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params->u.lzw.columns,
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params->u.lzw.colors,
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params->u.lzw.bpc);
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}
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break;
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}
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}
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fz_always(ctx)
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fz_drop_stream(ctx, body);
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fz_catch(ctx)
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fz_rethrow(ctx);
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return head;
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}
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fz_stream *
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fz_open_compressed_buffer(fz_context *ctx, fz_compressed_buffer *buffer)
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{
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return fz_open_image_decomp_stream_from_buffer(ctx, buffer, NULL);
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}
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size_t
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fz_compressed_buffer_size(fz_compressed_buffer *buffer)
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{
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if (buffer && buffer->buffer)
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return (size_t)buffer->buffer->cap;
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return 0;
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}
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