69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
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#include "fitz-imp.h"
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#include <zlib.h>
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#include <string.h>
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typedef struct fz_leech_s fz_leech;
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struct fz_leech_s
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{
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fz_stream *chain;
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fz_buffer *buffer;
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};
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static int
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next_leech(fz_context *ctx, fz_stream *stm, size_t max)
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{
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fz_leech *state = stm->state;
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fz_buffer *buffer = state->buffer;
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size_t n = fz_available(ctx, state->chain, max);
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if (n > max)
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n = max;
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while (buffer->cap < buffer->len + n)
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{
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fz_grow_buffer(ctx, state->buffer);
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}
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memcpy(buffer->data + buffer->len, state->chain->rp, n);
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stm->rp = buffer->data + buffer->len;
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stm->wp = buffer->data + buffer->len + n;
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state->chain->rp += n;
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buffer->len += n;
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if (n == 0)
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return EOF;
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return *stm->rp++;
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}
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static void
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close_leech(fz_context *ctx, void *state_)
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{
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fz_leech *state = (fz_leech *)state_;
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fz_drop_stream(ctx, state->chain);
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fz_drop_buffer(ctx, state->buffer);
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fz_free(ctx, state);
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}
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/*
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Attach a filter to a stream that will store any
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characters read from the stream into the supplied buffer.
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chain: The underlying stream to leech from.
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buf: The buffer into which the read data should be appended.
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The buffer will be resized as required.
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Returns pointer to newly created stream. May throw exceptions on
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failure to allocate.
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*/
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fz_stream *
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fz_open_leecher(fz_context *ctx, fz_stream *chain, fz_buffer *buffer)
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{
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fz_leech *state = fz_malloc_struct(ctx, fz_leech);
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state->chain = fz_keep_stream(ctx, chain);
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state->buffer = fz_keep_buffer(ctx, buffer);
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return fz_new_stream(ctx, state, next_leech, close_leech);
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}
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